KR101529444B1 - Communication apparatus - Google Patents

Abstract

A measurement value packet for notifying the measured value measured and a time synchronization packet for time synchronization are transmitted and received between the MU (Merging Unit) 100 and the IED (Integrated Electronic Device) 200. The operation unit 102 of the MU 100 and the operation unit 202 of the IED 200 process the measurement value packet and the communication unit 101 of the MU 100 and the communication unit 201 of the IED 200 are connected to the operation unit And processes the time synchronization packet independently of the time synchronization packets (102, 202).

Description

[0001] COMMUNICATION APPARATUS [0002]

The present invention relates to a time synchronization technique.

Hereinafter, for example, a time synchronization technique in an electronicized power system protection system in a substation will be mainly described.

A power system protection system is a system for protecting a power system from an electrical fault due to an earth fault or disconnection in a substation or the like.

7, the power system protection system includes one or more MUs (Merging Units) 100 and an IED (Integrated Electronic Device) 200, and the MU 100 and the IED 200 can communicate with each other And is connected to the line 300.

The MU 100 is connected to a transformer 400 for a meter disposed in a power system (for example, a transmission line 500 or the like) and controls the current or voltage of the power system (hereinafter, (Collectively referred to as " current voltage ") periodically and transmits a sampling value of the current voltage of the power system to the IED 200 periodically.

The IED 200 is a calculation unit for collecting a sampled value of a current voltage from the MU 100 (hereinafter simply referred to as a measured value) to determine an abnormality in the power system.

Each communication line 300 between each MU 100 and the IED 200 is independent from each other.

The IED 200 detects the occurrence of an abnormality by comparing the difference from the current voltage value at the same time in another place in the power system.

For example, in detecting disconnection of a transmission line, the MU 100 measures a current waveform at both ends of the transmission line, and the IED 200 calculates a disconnection point from the phase shift.

Therefore, it is required that the MUs 100 sample the current voltage at the same timing with each other.

In order to realize this, a means for sharing the clock indicating the same time by the time synchronization between the IED 200 and the MU 100, and making the sampling timing coincide with each other based on the clock is taken.

In the time synchronization, the IED 200 distributes the current time to each MU 100, thereby sharing the same time between the MUs 100.

Conventionally, in the power system protection system, a direct connection of analog input / output and a proprietary network of a manufacturer are employed as a communication line between the IED 200 and the MU 100. However, the recent adoption of Ethernet (registered trademark) It is progressing.

In accordance with Ethernet (registered trademark) between the IED and the MU, a system using the same Ethernet (registered trademark) line is used for the time synchronization.

With this method, the transmission of the measurement value of the current voltage and the time synchronization can be performed by the same Ethernet (registered trademark) line, so that the line cost can be reduced.

An example of a method of realizing time synchronization by packet communication on an Ethernet (registered trademark) line is IEEE 1588 shown in Non-Patent Document 1.

The principle of time synchronization according to IEEE 1588 is shown in Fig.

One computer A transmits a packet (hereinafter referred to as a sync packet) storing the current time to the other computer B. The computer B acquires the current time from the sync packet received from the computer A, do.

Further, in order to compensate for the delay of the clock correction due to the packet propagation delay between the computers AB, packets are returned between the computers AB (each packet is referred to as a delay-req packet, delay-resp packet) The response time Y, which is the packet round-trip time, and the response time X, which is the processing delay time in the computer A, are measured.

Response time X is the time until computer A receives the delay-req packet and then sends a delay-resp packet in response to the received delay-req packet.

Also, the response time Y is the time from when the computer B transmits the delay-req packet to when it receives the delay-resp packet.

Then, in the computer B, the time is corrected by adding the propagation delay time D = (Y-X) / 2 to the clock.

As described above, in the time synchronization according to IEEE 1588, transmission and reception of packets are required to be performed at least three times (1.5 round trips) in order to report the current time and measure the propagation delay.

As an implementation method of the time synchronization, there is a software method in which software installed in the terminal performs time allocation and delay measurement, and a hardware method implemented in hardware implemented in the terminal, and the latter has high precision of time synchronization.

In the present specification, the latter hardware method will be described with attention.

However, the time synchronization technique described in this specification may be used in a software method.

As a time synchronizing technique based on a hardware method, there is a technique disclosed in Patent Document 1.

Hereinafter, with reference to FIG. 7 and FIG. 8, description will be given of the configuration of the IED 200 and the MU 100 for performing time synchronization with an Ethernet (registered trademark) line and the sequence of time synchronization according to the technique of Patent Document 1 do.

The IED 200 in Patent Document 1 is composed of a communication unit for communicating with the MU 100 and an operation unit for determining the abnormality of the power system from the measured values received from the MU 100 (not shown).

The MU 100 is constituted by a communication unit for communicating with the IED 200 and an operation unit for sampling the current voltage from the measuring instrument transformer 400 disposed in the power system and sending the sampled current voltage to the IED 200 via the communication unit skip).

The operation unit of the IED 200 and the operation unit of the MU 100 all have a function of receiving packets from the communication unit and analyzing them, and a function of generating arbitrary packets.

Between the IED 200 and the MU 100 of Patent Document 1, the calculation unit of the MU 100 periodically generates measurement value packets for notifying the measurement values of the current voltage, and the communication unit transmits the measurement value packets to the IED 200 In the IED 200, the calculation unit interprets the measurement value appearing in the measurement value packet to determine the abnormality of the power system.

In addition, a sync packet, a delay-req packet, and a delay-resp packet shown in FIG. 8 are transmitted and received between the IED 200 and the MU 100 between transmission and reception of the measurement value packet.

In the transmission / reception of the sync packet, the delay-req packet and the delay-resp packet, the IED 200 serves as the computer A of FIG. 8 and the MU 100 serves as the computer B of FIG.

Specifically, the following operations are performed in the transmission and reception of the sync packet, the delay-req packet, and the delay-resp packet.

Hereinafter, the sync packet, the delay-req packet, and the delay-resp packet are generically referred to as a 'time synchronization packet'.

The operation unit of the IED 200 generates a sync packet for notifying the current time in the IED 200, outputs the generated sync packet to the communication unit, and the communication unit transmits the sync packet to the MU 100.

In the MU 100, the communication unit receives the sync packet, stores the current time indicated in the sync packet, and outputs a sync packet to the operation unit.

The operation unit of the MU 100 that inputs the sync packet generates a delay-req packet and outputs a delay-req packet to the communication unit, and the communication unit transmits the delay-req packet to the IED 200.

At this time, the communication unit of the MU 100 stores the transmission time of the delay-req packet.

In the IED 200, the communication unit receives the delay-req packet and outputs the delay-req packet to the operation unit.

On the other hand, the communication unit of the IED 200 stores the reception time at the time of receiving the delay-req packet.

The operation unit of the IED 200 that inputs the delay-req packet generates an empty delay-resp packet (a delay-resp packet having an empty payload) and outputs an empty delay-resp packet to the communication unit.

The communication unit that inputs the empty delay-resp packet writes the processing delay time (corresponding to the response time X in FIG. 8) in the IED 200 into the payload of the delay-resp packet, -resp packet to the MU (100).

In the MU 100, the communication unit receives the delay-resp packet and calculates the time (corresponding to the response time Y in Fig. 8) of the difference between the reception time of the delay-resp packet and the transmission time of the delay-req packet, 8 and calculates the time correction value from the current time notified by the propagation delay time D and the sync packet to calculate the time of the internal clock .

Japanese Patent Laid-Open No. 2006-81194

"IEEE 1588 ", The Institute of Electrical and Electronics Engineers, 24 July 2008

In the technique of Patent Document 1, a method is employed in which a time synchronization packet in which the operation section of the IED or MU is empty is generated, the communication section intercepts the empty time synchronization packet, and the time information is set in the empty time synchronization packet.

In this manner, if the arithmetic unit does not generate the time synchronization packet, the time synchronization sequence shown in Fig. 8 is not started and the time synchronization sequence does not proceed.

Generally, if a new time synchronization sequence is not performed after the time synchronization sequence is performed between the IED and the MU, the clocks of the IED and the MU are gradually shifted from each other.

The reason for this is that in an oscillator such as a quartz oscillator for causing a clock to flow, there is an error for each solid in the frequency per unit time, and the oscillator of the IED and the MU do not completely coincide in frequency per unit time.

For this reason, it is necessary to continuously repeat the time synchronization sequence in a short cycle in order to keep the error of the clock of the IED and the MU continuously small.

Therefore, in the method in which the processing of the arithmetic section is required to start and proceed with the time synchronization sequence as described in Patent Document 1, in order to repeat the time synchronization sequence in a short cycle, it is necessary to repeat the processing for time synchronization in the operation section in a short cycle .

For this reason, there is a fear that a load is applied to the arithmetic unit, which affects processing for system protection (processing for determining whether there is abnormality in the power system by analyzing the measured value).

SUMMARY OF THE INVENTION The present invention has been made in consideration of this point, and its main purpose is to constantly synchronize the time between apparatuses subject to time synchronization without applying a load to the operation unit.

A communication device according to the present invention comprises:

An operation unit, and a communication unit for transmitting and receiving packets,

A communication device for communicating a measurement value packet notifying a measured value and a time synchronization packet for time synchronization with a packet communication destination apparatus,

The arithmetic unit performs processing on the measurement value packet,

And the communication section performs processing for the time synchronization packet independently of the operation section.

According to the present invention, the processing of the time synchronization packet is performed independently from the operation unit by the communication unit, so that no load is imposed on the operation unit even if the time synchronization sequence is executed.

Therefore, the time synchronization sequence can be repeated in a short cycle without applying a load to the operation unit, and the time can always be matched between the communication apparatus and the packet communication destination apparatus.

1 is a diagram showing a configuration example of an IED and an MU according to Embodiments 1 and 2,
2 is a diagram showing a configuration example of a communication unit according to the first and second embodiments,
3 is a diagram showing a sequence of time synchronization between the IED and the MU according to the first embodiment,
4 is a diagram showing the sequence of time synchronization between the IED and the MU according to the first embodiment,
5 is a diagram showing the sequence of time synchronization between the IED and the MU according to the second embodiment,
6 is a diagram showing the sequence of time synchronization between the IED and the MU according to the second embodiment,
7 is a view showing an example of the connection configuration of the power system protection system,
8 is a diagram showing an example of a time synchronization sequence,
9 is a diagram showing an example of a measurement value packet according to Embodiments 1 and 2,
10 is a diagram showing an example of a sync packet according to Embodiments 1 and 2,
11 is a diagram showing an example of a delay-req packet according to Embodiments 1 and 2,
12 is a diagram showing an example of a delay-resp packet according to Embodiments 1 and 2,
13 is a diagram showing a configuration example of a conventional communication unit,
14 is a diagram showing a sequence of time synchronization between a conventional IED and an MU,
15 is a diagram showing a sequence of time synchronization between a conventional IED and an MU,
16 is a diagram showing a sequence of time synchronization between a conventional IED and an MU,
17 is a diagram showing an example of the hardware configuration of the IED and the MU according to the first and second embodiments.

(Example 1)

1 shows an internal configuration example of the MU 100 and the IED 200 according to the present embodiment.

The MU 100 has a communication unit 101 and an arithmetic unit 102. The IED 200 has a communication unit 201 and an arithmetic unit 202. [

In the present embodiment, an example in which a hardware system is used as an implementation method of time synchronization will be described.

Therefore, the communication unit 101 and the arithmetic unit 102 of the MU 100 are separate hardware.

The communication unit 201 and the arithmetic unit 202 of the IED 200 are also separate hardware.

The communication unit 101 of the MU 100 may also be referred to as an 'MU communication unit 101' and the operation unit 102 of the MU 100 may also be referred to as an 'MU operation unit 102'.

The communication unit 201 of the IED 200 is also referred to as an IED communication unit 201 and the operation unit 202 of the IED 200 is also referred to as an IED operation unit 202.

The MU 100 and the IED 200 according to the present embodiment are connected to the communication line 300 as shown in Fig.

As shown in the description of Patent Document 1, the MU calculation unit 102 periodically generates a measurement value packet to notify the measurement value of the current voltage, and the MU communication unit 101 transmits the measurement value packet to the IED 200, In the IED 200, the IED arithmetic unit 202 analyzes the measurement value appearing in the measurement value packet to determine the abnormality of the power system.

A sync packet, a delay-req packet, and a delay-resp packet (an example of a time synchronization packet) shown in FIG. 8 are transmitted and received between the IED 200 and the MU 100 between transmission and reception of a measurement value packet.

In the transmission / reception of the sync packet, the delay-req packet and the delay-resp packet, the IED 200 serves as the computer A of FIG. 8 and the MU 100 serves as the computer B of FIG.

In this embodiment, the IED communication unit 201, not the IED operation unit 202, generates a sync packet and transmits the generated sync packet to the MU 100. [

In the MU 100, the MU communication unit 101 receives the sync packet and stores the current time indicated in the received sync packet.

Also, the MU communication unit 101, not the MU operation unit 102, generates a delay-req packet and transmits the generated delay-req packet to the IED 200. [

On the other hand, at this time, the MU communication unit 101 stores the transmission time of the delay-req packet.

In the IED 200, the IED communication unit 201, not the IED operation unit 202, receives the delay-req packet and the empty delay-resp packet (the delay-resp packet having the empty payload Resp. Packet), writes the processing delay time (corresponding to the response time X in FIG. 8) in the IED 200 to the payload of the generated delay-resp packet, and outputs the delay-resp And transmits the packet to the MU 100.

In the MU 100, the MU communication unit 101 receives the delay-resp packet and calculates the time (corresponding to the response time Y in Fig. 8) of the difference between the reception time of the delay-resp packet and the transmission time of the delay-req packet 8 from the calculated time and the processing delay time indicated in the delay-resp packet, calculates the time correction value from the current time notified by the propagation delay time D and the sync packet, The time of the internal clock in the MU 100 is updated.

As described above, in the IED 200 according to the present embodiment, unlike the technique of the patent document 1, the IED communication unit (not shown) is controlled without the control by the IED arithmetic unit 202 such as an instruction from the IED arithmetic unit 202 or an empty packet input 201 generates a sync packet independently of the IED arithmetic unit 202, and transmits a sync packet to the MU 100.

When the delay-req packet is received, the delay-req packet is not output to the IED arithmetic unit 202 and the IED arithmetic unit 202, such as an instruction from the IED arithmetic unit 202 or an empty packet input, The IED communication unit 201 generates a delay-resp packet independently of the IED computation unit 202 and transmits a delay-resp packet to the MU 100 without control.

Unlike the technique described in Patent Document 1, the MU 100 according to the present embodiment does not output a sync packet to the MU arithmetic unit 102, but also outputs an instruction from the MU arithmetic unit 102 or an input of an empty packet The MU communication unit 101 generates a delay-req packet independently of the MU arithmetic operation unit 102 and transmits a delay-req packet to the IED 200 without control by the MU arithmetic unit 102 of the MU operation unit 102. [

On the other hand, the MU 100 and the IED 200 are examples of a communication apparatus and a packet communication destination apparatus.

That is, when the MU 100 operates as a communication device, when the IED 200 operates as a packet communication destination device and the IED 200 operates as a communication device, .

Fig. 2 shows an internal configuration example of the MU communication unit 101 and the IED communication unit 201. Fig.

The MU communication unit 101 and the IED communication unit 201 each include a PHY 213 for processing the first layer (physical layer) of Ethernet (registered trademark), a MAC 211 for processing the second layer (data link layer) A time synchronization unit (transmission unit) that transmits (transmits) packets not related to the time synchronization between the PHY 213 and the MAC 211, intercepts packets related to the time synchronization, and performs predetermined processing on the intercepted packets 212).

The time synchronization unit 212 includes a packet routing unit 221, a time synchronization processing unit 222, and a time synchronization packet generation unit 223. [

The packet routing unit 221 performs packet transmission or interception according to the packet identifier of the packet passing between the PHY 213 and the MAC 211. [

The time synchronization processing section 222 receives the time synchronization packet and performs processing on the received time synchronization packet.

In the case of the MU 100, for example, the processing of the time synchronizing packet includes storing the current time notified by the sync packet, storing the delay time of the delay-req packet, calculating the time correction value, updating the internal clock, For example, the calculation of the processing delay time.

The time synchronization packet generation section 223 generates a time synchronization packet in accordance with an instruction from the time synchronization processing section 222. [

More specifically, the time synchronization packet generation unit 223 of the MU 100 generates a delay-req packet, and the time synchronization packet generation unit 223 of the IED 200 generates a sync packet and a delay-resp packet do.

On the other hand, Fig. 13 shows an example of the configuration of the communication unit of the MU and the IED in Patent Document 1 for clarifying the difference between this embodiment and Patent Document 1. In Fig.

In the patent document 1, since the time synchronization packet is generated in the calculation section, there is no time synchronization packet generation section 223 in the communication section of the patent document 1 as shown in FIG.

On the other hand, in Fig. 13, the configuration other than the time synchronization packet generation section 223 is the same as that in Fig.

Next, the format of a packet in which the MU 100 and the IED 200 communicate with each other according to the present embodiment is shown in Figs.

As shown in Figs. 9 to 12, in this embodiment, there are a measurement value packet (Fig. 9) used for periodic transmission of a measured value and a time synchronous packet for transmitting time information for time synchronization, Similar to IEEE 1588, three types of packets are used: a sync packet (FIG. 10), a delay-req packet (FIG. 11), and a delay-resp packet (FIG. 12).

In the measurement packet, reference numeral 41 denotes a MAC (Media Access Control) address of a transmission destination, 42 denotes a MAC address of a transmission source, 43 denotes an identifier indicating that the kind of the packet is a measurement value packet, , And 45 is the checksum of the entire packet.

Reference numeral 56 denotes an identifier indicating that the type of the packet is a sync packet; 54, an identifier indicating that the type of the packet is a sync packet; Transmission data of the load-in time information (information of the current time), and 55 is the checksum of the whole packet.

Reference numeral 63 denotes an identifier indicating that the type of the packet is a time synchronous packet. Reference numeral 66 denotes an identifier indicating that the type of the packet is a delay-req packet. In the delay-req packet, 61 indicates a transmission destination MAC address, 62 indicates a source MAC address, 64 is transmission data of time information (not essential) as payload, and 65 is a checksum of the whole packet.

In the delay-resp packet, 71 is a MAC address of a transmission destination, 72 is a source MAC address, 73 is an identifier indicating that the packet type is a time synchronous packet, 76 is an identifier indicating that the packet type is a delay- 74 is transmission data of the payload in-time information (information on the processing delay time in the IED 200), and 75 is a checksum of the entire packet.

The identifiers 43, 53, 56, 63, 66, 73, and 76 shown in Figs. 9 to 12 are identifiers used to identify the types of packets, and correspond to examples of type identifier data.

Next, the sequence of time synchronization between the IED 200 and the MU 100 according to the present embodiment will be described with reference to Figs. 3 and 4. Fig.

(0) Preset

As a preset, when the IED arithmetic unit 202 detects a packet in which the packet identifier is a measurement value packet, the packet routing unit 221 of the time synchronization unit 212 detects the measurement value packet by the time synchronization processing unit 222 ).

(1) Time synchronization (sync packet transmission) (FIG. 3)

In the following description, the IED communication unit 201 of the IED 200 starts to explain the process from the time when the measurement value packet is received from the MU 100.

First, the packet routing unit 221 of the time synchronizing unit 212 in the IED communication unit 201 reads the packet identifier of the packet transmitted from the PHY 213. [

Thus, the packet routing unit 221 sends the packet to the time synchronization processing unit 222 immediately after transmitting (transmitting) the packet to the end of the measurement value packet to the MAC 211, because the packet identifier indicating the measurement value packet can be read. And notifies reception of the measurement value packet (S101).

Next, the time synchronization processing unit 222 receives the reception of the measurement value packet from the packet routing unit 221, and instructs the time synchronization packet generation unit 223 to generate a sync packet (S102).

The time synchronization packet generation unit 223 generates a sync packet (Fig. 10) in which the packet identifier is time synchronous and sync and the time information (information of the current time in the IED 200) is stored in the transmission data, The generated sync packet is transmitted to the packet routing unit 221 (S103).

The packet routing unit 221 transmits the sync packet transmitted from the time synchronization packet generation unit 223 to the PHY 213 (S104).

The PHY 213 transmits the sync packet transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S105).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S106).

The packet routing unit 221 of the time synchronization unit 212 reads the packet identifier of the packet transmitted from the PHY 213. [

Thus, since the packet identifier indicating the time synchronization packet can be read, the transmitted time synchronization packet is transmitted to the time synchronization processing unit 222 (S107).

The time synchronization processing unit 222 receives the time synchronization packet transmitted from the packet routing unit 221 and determines from the packet identifier that it is a sync packet and generates time information (information of the current time of the IED 200) (S108).

Then, the time synchronization processing unit 222 stores the time information (information of the current time of the IED 200) read from the transmission data of the sync packet (refer to FIG. 4).

(2) Time synchronization (delay-req packet transmission) (Fig. 4)

The time synchronization processing unit 222 of the MU 100 receives the time synchronization packet (sync packet) from the IED 200 and instructs the time synchronization packet generation unit 223 to generate the delay-req packet (S109) .

The time synchronization packet generation unit 223 generates a delay-req packet (FIG. 11) in which the packet identifier is time-synchronized with delay-req and stores arbitrary information in the transmission data To the packet routing unit 221 in step S110, and the packet routing unit 221 transmits the delay-req packet to the PHY 213 in step S111.

The content of the transmission data of the delay-req packet may arbitrarily store predetermined time information or may be meaningless information.

The PHY 213 of the MU 100 transmits the delay-req packet to the PHY 213 of the IED 200 and the packet routing unit 221 of the IED 200 transmits the delay- It is determined that the packet received by the detection of the identifier is a time synchronization packet, and the received time synchronization packet is transmitted to the time synchronization processing unit 222 (S112 to S114).

On the other hand, in the MU 100, the time synchronization processing unit 222 receives the delay-req packet transmission time from the PHY 213, and stores the delay-req packet transmission time.

Or the time synchronization processing unit 222 of the MU 100 receives from the packet routing unit 221 the time at which the packet routing unit 221 transmits the delay-req packet to the PHY 213 as the transmission time of the delay-req packet Receiving the notification, the transmission time of the delay-req packet is stored.

(3) Time synchronization (delay-resp packet transmission) (Fig. 4)

The time synchronization processing unit 222 of the IED 200 detects the packet identifier of the time synchronization packet and determines that the received packet is a delay-req packet and notifies the time synchronization packet generation unit 223 of the delay- (S115).

The time synchronization packet generation unit 223 generates a delay-resp packet (FIG. 12) in which the packet identifier is time-synchronized and delay-resp, and the time information (information on the processing delay time in the IED 200) And transmits the generated delay-resp packet to the packet routing unit 221 (S116).

The processing delay time (corresponding to the response time X in FIG. 8) in the IED 200 is the time required until the IED 200 receives the delay-req packet and then transmits the delay-resp packet in response to the delay-req packet It is time.

The time synchronizing packet generating unit 223 of the IED 200 generates a delay-resp packet from the time when the packet routing unit 221 detects that the delay-req packet has been received from the time synchronizing packet generating unit 223, The time until generation may be described in the delay-resp packet as the processing delay time.

Alternatively, the time synchronization packet generation unit 223 may derive an average time from the reception of the delay-req packet to the transmission of the delay-resp packet from the statistical information, -resp packet.

Then, the packet routing unit 221 of the IED 200 transmits a delay-resp packet to the PHY 213 (S117).

The PHY 213 transmits the delay-resp transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S118).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S119).

The packet routing unit 221 of the time synchronization unit 212 reads the packet identifier of the packet transmitted from the PHY 213. [

Thus, since the packet identifier indicating the time synchronization packet can be read, the transmitted time synchronization packet is transmitted to the time synchronization processing unit 222 (S120).

The time synchronization processing unit 222 receives the time synchronization packet transmitted from the packet routing unit 221 and determines that the packet received from the packet identifier 54 is a delay-resp packet, Information (information on the processing delay time in the IED 200) (S121).

The time synchronization processing unit 222 calculates the time (corresponding to the response time Y in FIG. 8) of the difference between the reception time of the delay-resp packet and the transmission time of the delay-req packet, and outputs the calculated time to the delay- The propagation delay time D shown in Fig. 8 is calculated from the processing delay time shown, the time correction value is calculated from the current time notified by the propagation delay time D and the sync packet, and the internal clock is updated.

For example, the internal clock is updated as the current time of the MU 100 as the time obtained by adding the propagation delay time D to the current time notified by the sync packet.

On the other hand, it can be considered that the reception time of the delay-resp packet is, for example, the time when the time synchronization processing unit 222 has determined that the delay-resp packet is input (time of S120).

Alternatively, the PHY 213 stores the reception time of the packet when receiving the packet from the IED 200, and when the time synchronization processing unit 222 detects that the delay-resp packet has been received, 213 to the reception time of the delay-resp packet, and the time notified from the PHY 213 may be the reception time of the delay-resp packet.

3, the MU operation unit 102 generates a measurement value packet, and the MU communication unit 101 transmits the measurement value packet to the IED 200. The MU communication unit 101 transmits the measurement value packet to the IED 200, And the IED communication unit 201 receives the measurement value packet and outputs the measurement value packet to the IED operation unit 202. [

The IED calculating unit 202 analyzes the measured values as described above to determine whether or not the power system is abnormal.

As described above, in this embodiment, the IED communication unit 201 autonomously generates a sync packet independently of the operation of the IED arithmetic unit 202, and transmits the sync packet to the MU 100.

When the delay-req packet is received, the IED communication unit 201 does not output the delay-req packet to the IED arithmetic unit 202, and autonomously performs delay-resp Generates a packet, and transmits a delay-resp packet to the MU 100.

In the MU 100 according to the present embodiment, the MU communication unit 101 does not output the sync packet to the MU operation unit 102, and autonomously performs the delay-req Generates a packet, and transmits a delay-req packet to the IED 200. [

On the other hand, in the technique of Patent Document 1, the operation of the communication unit of the IED depends on the operation of the operation unit, and the operation of the communication unit of the MU depends on the operation of the operation unit.

For comparison between the IED 200 and the MU 100 according to the first embodiment, an example of the operation of the IED 200 and the MU 100 in the technique of Patent Document 1 will be described with reference to Figs. 14 to 16 do.

(1) Time synchronization (sync packet transmission) (Fig. 14)

3, the communication unit of the IED 200 starts the description from the time when the measurement value packet from the MU 100 is received.

The operation unit of the IED 200 generates a packet whose packet identifier is time-synchronized with sync and whose data content (payload) is empty after the periodic transmission of the measured value is completed, and transmits it to the MAC 211 (S1).

The MAC 211 transmits the packet transmitted from the operation unit to the time synchronization unit 212 (S2).

The packet routing unit 221 of the visual synchronization unit 212 reads the packet identifier of the packet transmitted from the MAC 211. [

In this way, since the packet identifier indicating the time synchronization packet can be read, the packet is transmitted to the time synchronization processing unit 222 (S3).

The time synchronization processing unit 222 receives the packet transmitted from the packet routing unit 221, determines that the packet is the packet identifier sync, writes the time information (information of the current time in the IED 200) in the transmission data of the packet , And transmits it to the packet routing unit 221 (S4).

The packet routing unit 221 transmits the packet transmitted from the time synchronization processing unit 222 to the PHY 213 (S5).

The PHY 213 transmits the packet transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S6).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S7).

The packet routing unit 221 of the time synchronization unit 212 reads the packet identifier of the packet transmitted from the PHY 213. [

Thus, since the packet identifier indicating the time synchronization packet can be read, the packet is transmitted to the time synchronization processing unit 222 (S8).

The time synchronization processing unit 222 receives the packet transmitted from the packet routing unit 221, determines that it is the packet identifier sync, reads the time information (information of the current time in the IED 200) from the transmission data of the packet , And transmits it to the packet routing unit 221 (S9).

The time synchronization processing unit 222 also stores the time information (information of the current time of the IED 200) read from the transmission data of the sync packet.

The packet routing unit 221 transmits the sync packet transmitted from the time synchronization processing unit 222 to the MAC 211 (S10).

The MAC 211 transmits the sync packet to the operation unit (S11) (see FIG. 15).

(2) Time synchronization (delay-req packet transmission) (Fig. 15)

The operation unit of the MU 100 receives the sync packet from the IED 200 and generates a packet (delay-req packet) in which the packet identifier is time-synchronous and delay-req and the transmission data is empty, (S12).

The MAC 211 transmits a delay-req packet in which the transmission data is empty to the packet routing unit 221 (S13), and the packet routing unit 221 transmits the delay-req packet in which the transmission data is empty to the time synchronization processing unit 222 (S14).

The time synchronization processing unit 222 writes predetermined time information in the transmission data of the delay-req packet or keeps the transmission data as it is, and if the time data is written in the transmission data or the transmission data remains empty delay-req packet to the packet routing unit 221 (S15).

Then, the packet routing unit 221 transmits a delay-req packet to the PHY 213 (S16), and the PHY 213 transmits a delay-req packet to the PHY 213 of the IED 200 (S17) .

On the other hand, in S17 of the MU 100, the time synchronization processing unit 222 receives the delay-req packet transmission time from the PHY 213, and stores the delay-req packet transmission time.

The IED 200 transmits the packet received by the PHY 213 to the packet routing unit 221 (S18), and determines that the packet received by the packet routing unit 221 upon detection of the packet identifier is a time synchronization packet , And transmits the received time synchronization packet to the time synchronization processing unit 222 (S19).

The time synchronization processing unit 222 detects the packet identifier of the time synchronization packet, determines that the received packet is a delay-req packet, instructs the packet routing unit 221 to transfer the delay-req packet to the operation unit, To the packet routing unit 221 (S20).

The packet routing unit 221 transmits a delay-req packet to the MAC 211 (S21), and the MAC 211 transmits a delay-req packet to the operation unit (S22) (see FIG. 16).

(3) Time synchronization (delay-resp packet transmission) (Fig. 16)

The operation unit of the IED 200 generates a packet whose packet identifier is time synchronous and delay-resp, and whose data contents are empty, and transmits it to the MAC 211 (S23).

The MAC 211 transmits the packet transmitted from the operation unit to the time synchronization unit 212 (S24).

The packet routing unit 221 of the visual synchronization unit 212 reads the packet identifier of the packet transmitted from the MAC 211. [

In this way, since the packet identifier indicating the time synchronization packet can be read, the packet is transmitted to the time synchronization processing unit 222 (S25).

The time synchronization processing unit 222 receives the packet transmitted from the packet routing unit 221, determines that the packet is the packet identifier delay-resp, adds time information (information on the processing delay time in the IED 200) to the transmission data of the packet And transmits it to the packet routing unit 221 (S26).

The packet routing unit 221 transmits the packet transmitted from the time synchronization processing unit 222 to the PHY 213 (S27).

The PHY 213 transmits the packet transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S28).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S29).

The packet routing unit 221 of the time synchronization unit 212 reads the packet identifier of the packet transmitted from the PHY 213. [

In this way, since the packet identifier indicating the time synchronization packet can be read, the packet is transmitted to the time synchronization processing unit 222 (S30).

The time synchronization processing unit 222 receives the packet transmitted from the packet routing unit 221 and determines that the packet is the packet identifier delay-resp. Based on the transmission data of the packet, the time synchronization information (information on the processing delay time in the IED 200) And transmits a delay-resp packet to the packet routing unit 221 (S31).

The packet routing unit 221 transmits the delay-resp packet transmitted from the time synchronization processing unit 222 to the MAC 211 (S32).

The MAC 211 transmits a delay-resp packet to the operation unit (S33).

Thereafter, the arithmetic unit of the MU 100 calculates the time (corresponding to the response time Y in Fig. 8) of the difference between the reception time of the delay-resp packet and the transmission time of the delay-req packet, 8 from the processing delay time indicated in the resp packet, calculates the time correction value from the current time notified by the propagation delay time D and the sync packet, and updates the internal clock.

As described above, according to the present embodiment, the time synchronization unit 212 of the IED 200 detects the passing of the measurement value packet transmitted periodically and autonomously starts the time synchronization (generates and transmits a sync packet by a magnetic force) do.

When the IED 200 or the time synchronization unit 212 of the MU 100 receives the time synchronization packet, it generates and transmits the time synchronization packet to be transmitted next by the magnetic force.

This enables the time synchronization processing to be performed without depending on the processing of the IED 200 and the operation units 102 and 202 of the MU 100. [

As described above, the time synchronizing is performed autonomously between the time synchronizing units 212 and can be performed independently of the processes of the IED 200 and the operation units 102 and 202 of the MU 100, ) Is reduced.

That is, since the communication sections 101 and 201 perform the processing for the received time synchronization packet and the transmission of the time synchronization packet to be transmitted, no load is applied to the operation sections 102 and 202 even if the time synchronization sequence is executed.

Therefore, the time synchronization sequence can be repeated in a short cycle without affecting the processing for the system protection performed by the arithmetic units 102 and 202, so that the time between the IED 200 and the MU 100 is always coincident with each other .

Further, by reducing the load on the arithmetic units 102 and 202, it is possible to employ a less expensive arithmetic unit as the arithmetic units 102 and 202, and the cost reduction effect can be expected.

In addition, since the processing of the arithmetic units 102 and 202 is not required to execute the time synchronization, the effect of the software designing of the arithmetic units 102 and 202 can be expected.

The transmission of the received time synchronization packet from the communication units 101 and 201 to the operation units 102 and 202 and the transmission of the empty time synchronization packets from the operation units 102 and 202 to the communication units 101 and 201 can be omitted The processing time in the IED 200 and the MU 100 can be shortened and the power consumption can be reduced.

(Example 2)

In the first embodiment, the packet routing unit 221 of the time synchronizing unit 212 receives the packet transmitted from the outside to the packet identifier, and starts transmission (transmission) of the packet after detecting the packet identifier.

On the other hand, when a packet is started to be received by the packet routing unit 221, a method of immediately transmitting (transmitting) the packet to the time synchronization processing unit 222 and the MAC 211 without discriminating the type of the packet can be considered .

Thereby, it is not necessary to wait for the packet routing unit 221 to receive the packet identifier, and consequently, the time required for the time synchronous communication can be shortened.

However, in this case, since the packet routing unit 221 transmits (transmits) the packet to the MAC 211 unconditionally, the time synchronization packet reaches the MAC 211 at this time, and the operation unit (MU operation unit 102 or IED (The arithmetic unit 202) determines the time synchronizing packet arriving at the MAC 211 occurs.

Therefore, in this embodiment, the packet routing unit 221 detects the packet identifier of the packet in parallel with the transmission (transmission), and stops transmission (transmission) to the MAC 211 in the middle if it is a time synchronization packet.

As a result, the time synchronization packet arriving at the MAC 211 becomes an error as a result of the checksum check.

Here, the MAC 211 discards the packet with a checksum error, and does not notify the packet reception to the operation unit (the MU operation unit 102 or the IED operation unit 202), so that the time synchronization packet arriving at the MAC unit 211 It is possible to eliminate the discrimination process.

Hereinafter, the operation according to the present embodiment will be described in detail.

First, the configurations of the IED 200 and the MU 100 are the same as those in the first embodiment.

However, some functions are different.

When the packet routing unit 221 starts receiving packets as described above, the packet routing unit 221 immediately transmits (transmits) the packets to the time synchronization processing unit 222 and the MAC 211 without discriminating the type of the packet.

The time synchronization processing unit 222 also adds a function of detecting the packet identifier of the packet transmitted from the packet routing unit 221 and starting the time synchronization if it is a preset identifier.

Next, the sequence of time synchronization between the IED 200 and the MU 100 will be described with reference to Figs. 5 and 6. Fig.

(0) Preset

As a preset, the arithmetic unit 202 of the IED 200 sets the time synchronization unit 222 of the time synchronization unit 212 to start time synchronization when a packet whose packet identifier is a measurement value packet is received .

(1) Time synchronization (sync packet transmission) (FIG. 5)

3, the communication unit 201 of the IED 200 starts explaining from the time when the measurement value packet from the MU 100 is received.

The time synchronization processing unit 222 of the time synchronizing unit 212 reads the packet identifier of the packet transmitted from the packet routing unit 221. [

Thus, since the packet identifier indicating the measurement value packet can be read, the time synchronization processing section 222 commands the time synchronization packet generation section 223 to generate a sync packet (S201).

The time synchronization packet generation unit 223 generates a sync packet (Fig. 10) in which the packet identifier is time synchronous and sync and the time information (information of the current time in the IED 200) is stored in the transmission data, The generated sync packet is transmitted to the packet routing unit 221 (S202).

The packet routing unit 221 transmits the sync packet transmitted from the time synchronization packet generation unit 223 to the PHY 213 (S203).

The PHY 213 transmits the sync packet transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S204).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S205).

The packet routing unit 221 of the time synchronization unit 212 transmits the packet transmitted from the PHY 213 to the time synchronization processing unit 222 and the MAC 211 (S206, S208).

However, since the packet routing unit 221 detects the packet identifier in parallel with the packet transmission and as a result, the packet being transmitted to the MAC 211 is determined to be the time synchronization packet, the transmission to the MAC 211 is stopped (S208).

The time synchronization processing unit 222 receives the packet transmitted from the packet routing unit 221, determines that the packet is a sync packet from the packet identifier, generates time information (information of the current time of the IED 200) from the transmission data of the sync packet (S207).

The time synchronization packet arriving at the MAC 211 (the time synchronizing packet whose transmission to the MAC 211 is interrupted) becomes an error as a result of checksum inspection by the MAC 211.

Here, the MAC 211 discards the time synchronization packet, which is a checksum error, and does not notify the MU operating unit 102 of the reception of the time synchronization packet (see FIG. 6).

(2) Time synchronization (delay-req packet transmission) (Fig. 6)

S209 to S213 are the same as S109 to S113 in Fig. 4 shown in the first embodiment.

That is, the time synchronization processing unit 222 of the MU 100 receives the time synchronization packet (sync packet) from the IED 200 and instructs the time synchronization packet generation unit 223 to generate the delay-req packet ( S209).

The time synchronization packet generation unit 223 generates a delay-req packet (FIG. 11) in which the packet identifier is time-synchronized with delay-req and stores arbitrary information in the transmission data, Packet to the packet routing unit 221 in step S210, and the packet routing unit 221 transmits the delay-req packet to the PHY 213 in step S211.

The PHY 213 of the IED 200 transmits the delayed req packet to the PHY 213 of the IED 200 by the PHY 213 of the MU 100, (Step S213).

The packet routing unit 221 transmits the packet transmitted from the PHY 213 to the time synchronization processing unit 222 and the MAC 211 (S214, S215).

However, since the packet routing unit 221 detects the packet identifier in parallel with the transmission of the packet and, as a result, it is determined to be the time synchronization packet, the transmission to the MAC 211 is interrupted (S215).

The time synchronization packet (the time synchronizing packet in which the transmission to the MAC 211 is interrupted in the middle) arriving at the MAC 211 is an error as a result of checksum inspection by the MAC 211.

Here, the MAC 211 discards the time synchronization packet, which is a checksum error, and does not notify the MU operation unit 102 of the reception of the time synchronization packet.

(3) Time synchronization (delay-resp packet transmission) (Fig. 6)

S216 to S220 are similar to S115 to S119 in Fig. 4 shown in the first embodiment.

That is, the time synchronization processing unit 222 of the IED 200 detects the packet identifier of the time synchronization packet to determine that it is a delay-req packet, and instructs the time synchronization packet generation unit 223 to generate the delay- (S216).

The time synchronization packet generation unit 223 also generates a delay-resp packet (also referred to as a delay-resp packet) in which the packet identifier is time synchronous and delay-resp, and the time information (information on the processing delay time in the IED 200) 12), and transmits the generated delay-resp packet to the packet routing unit 221 (S217).

Then, the packet routing unit 221 of the IED 200 transmits a delay-resp packet to the PHY 213 (S218).

The PHY 213 transmits the delay-resp packet transmitted from the packet routing unit 221 to the PHY 213 of the MU 100 (S219).

The PHY 213 of the MU 100 transmits the packet transmitted from the IED 200 to the time synchronization unit 212 (S220).

Next, the packet routing unit 221 transmits the packet transmitted from the PHY 213 to the time synchronization processing unit 222 and the MAC 211 (S221, S222).

However, since the packet routing unit 221 detects the packet identifier in parallel with the packet transmission and as a result, it is determined that the packet is the time synchronization packet, the transmission to the MAC 211 is interrupted (S222).

The time synchronization packet arriving at the MAC 211 becomes an error as a result of the checksum check.

Here, the MAC 211 discards the packet with a checksum error and does not notify the MU arithmetic unit 102 of the packet reception.

The time synchronization processing unit 222 calculates the propagation delay time D shown in Fig. 8, calculates the time correction value from the current time notified by the propagation delay time D and the sync packet, and updates the internal clock.

On the other hand, even when the IED 200 receives the measurement value packet, the packet routing unit 221 outputs the received packet to the time synchronization processing unit 222 and the MAC (MAC) processing unit 222 before detecting that the received packet is the measurement value packet. 211 (S301, S302 in FIG. 5).

Since the packet routing unit 221 maintains the transmission of the measurement value packet to the MAC 211 when the received packet is detected as the measurement value packet, the measurement value packet is not discarded in the MAC 211, And is transmitted to the arithmetic unit 202.

As a result, the IED arithmetic unit 202 analyzes the measurement value of the measurement value packet to determine whether or not the power system is abnormal.

As described above, in this embodiment, the communication unit outputs the received packet to the arithmetic unit before discriminating the type of the packet, and also determines that the received packet is a packet that is not necessary in the arithmetic unit Synchronous packet), the output of the packet to the operation unit is stopped, and the packet is discarded.

On the other hand, when the received packet is a packet (measurement value packet) necessary for the operation unit, the output of the packet to the operation unit is maintained, and the operation unit receives the packet.

Therefore, according to the present embodiment, packets can be outputted to the arithmetic operation unit at a time earlier than the time for discriminating the kind of the packet, and the processing time can be shortened.

As described above, in Examples 1 and 2,

A measurement unit (MU) for periodically sampling the current voltage of the power system; and a calculation unit (IED) for collecting sampling values of the current voltage from the measurement unit and judging the abnormality of the power system, Respectively,

The sampling value is stored in the packet from the measurement unit to the operation unit and is periodically transmitted,

Further, a power system protection system has been described in which time synchronization is performed by storing time information in a packet (time synchronization packet) at the time between the periodic transmission of the stored value of the sampled value (measurement value packet) and transmitting the packet.

In Examples 1 and 2,

Wherein the packet comprises:

There is at least two kinds of packets for storing the sampling value and a packet for time synchronization in which the time information is stored,

The communication unit of the calculation unit and the measurement unit,

A PHY and a MAC for performing network transmission processing, and a time synchronization unit for performing processing for time synchronization,

The time synchronization unit may include:

A packet routing unit for transmitting and capturing packets between the PHY and the MAC;

A time synchronization processing section for determining an identifier stored in the packet captured by the packet routing section and performing processing according to the identifier, and a time synchronization packet generation section for receiving a command of the time synchronization processing section and generating a packet for time synchronization Explained.

Further, in Examples 1 and 2,

Wherein the time synchronization unit of the calculation unit or the measurement unit comprises:

The packet routing unit reads the packet identifier of the packet received from the PHY and, if it is determined that the packet is a packet for time synchronization, transmits the packet to the time synchronization processing unit,

The time synchronization processing unit,

Wherein the control unit receives a packet transmitted from the packet routing unit and performs processing relating to time synchronization and instructs the time synchronization packet generation unit to generate a packet to be transmitted according to the received packet for time synchronization,

Wherein the time synchronization packet generation unit comprises:

A packet to be transmitted is generated in accordance with the received packet for time synchronization in accordance with an instruction from the time synchronization processing unit and is transmitted to the PHY through the packet routing unit.

Further, in the second embodiment,

Wherein the time synchronization unit of the calculation unit or the measurement unit comprises:

The packet routing unit identifies an identifier of a packet received from the PHY in parallel with starting transmission of a packet received from the PHY to the time synchronization processing unit and the MAC immediately and if it is determined that the packet is for time synchronization, Stop transmission of the packet to the MAC,

The time synchronization processing unit,

When the packet transmitted from the packet routing unit is received and the packet identifier is read and it is determined that the packet is a packet for time synchronization, the processing relating to time synchronization is performed, Commands generation of a packet to be transmitted in accordance with a packet for one time synchronization,

Wherein the time synchronization packet generation unit comprises:

A packet to be transmitted is generated according to the received packet for time synchronization in accordance with an instruction from the time synchronization processing unit and is transmitted to the PHY through the packet routing unit.

In the above, the MU and IED used in the power system protection system are described as an example.

However, the present invention is not limited to the use of the power system protection system, and if it is a communication device that transmits and receives a measurement value packet notifying the measured measurement value and a time synchronization packet for time synchronization, the configurations and procedures described in Embodiments 1 and 2 Can be applied.

Finally, hardware configurations of the MU 100 and the IED 200 shown in Embodiments 1 and 2 will be described.

17 is a diagram showing an example of hardware resources of the MU 100 and the IED 200 shown in the first and second embodiments.

17 shows an example of the hardware configuration of the MU 100 and the IED 200 only. The hardware configuration of the MU 100 and the IED 200 is not limited to the configuration shown in FIG. 17, But may have another configuration.

17, the MU 100 and the IED 200 are provided with a CPU 911 (a central processing unit, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a processor) .

The CPU 911 corresponds to the MU arithmetic unit 102 and the IED arithmetic unit 202 shown in Fig.

The CPU 911 is connected to the CPU 911 via a bus 912 such as a ROM (Read Only Memory) 913, a RAM (Random Access Memory) 914, a communication board 915, a display device 901, a keyboard 902, A mouse 903, and a magnetic disk device 920 to control these hardware devices.

The communication board 915 corresponds to the MU communication unit 101 and the IED communication unit 201 shown in Fig.

The CPU 911 may be connected to the FDD 904 (flexible disk drive) and the compact disk device 905 (CDD).

Instead of the magnetic disk device 920, a storage device such as a solid state drive (SSD), an optical disk device, or a memory card (registered trademark) read / write device may be used.

The RAM 914 is an example of a volatile memory. The storage medium of the ROM 913, the FDD 904, the CDD 905, and the magnetic disk device 920 is an example of a nonvolatile memory. These are examples of memory devices.

The communication board 915, the keyboard 902, the mouse 903, and the like are examples of input devices.

The communication board 915, the display device 901, and the like are examples of the output device.

The communication board 915 is connected to the communication line 300 as shown in Fig.

In the case of the MU 100, as shown in Fig. 7, the MU 100 is connected to a communication line for communicating with the transformer 400 for a meter.

In addition, the communication board 915 may be connected to a LAN (Local Area Network), the Internet, a WAN (WAN), a SAN (Storage Area Network), or the like.

An operating system 921 (OS), a window system 922, a program group 923, and a file group 924 are stored in the magnetic disk device 920.

The programs in the program group 923 are executed by the CPU 911 while using the operating system 921 and the window system 922. [

In the RAM 914, at least a part of a program or an application program of the operating system 921 to be executed by the CPU 911 is temporarily stored.

In the RAM 914, various data necessary for processing by the CPU 911 are stored.

A basic input output system (BIOS) program is stored in the ROM 913, and a boot program is stored in the magnetic disk device 920.

The BIOS program of the ROM 913 and the boot program of the magnetic disk unit 920 are executed and the operating system 921 is started by the BIOS program and the boot program at the start of the MU 100 and the IED 200 .

The program group 923 stores programs for executing the functions of the MU arithmetic unit 102 and the IED arithmetic unit 202 described in the first and second embodiments.

In Embodiments 1 and 2, an example has been described in which the communication unit (MU communication unit 101, IED communication unit 201) shown in FIG. 1 is hardware different from the computing unit (MU communication unit 101, IED computing unit 202).

However, the packet routing unit 221, the time synchronization processing unit 222, the time synchronization packet generation unit 223, and the MAC 211 shown in Fig. 2 are realized by a program, and programs for realizing these functions are stored in the magnetic disk apparatus 920).

The program in the magnetic disk device 920 is read by the CPU 911 and executed.

The group of files 924 includes information such as "judgment of", "judgment of", "inspection of", "detection of", "generation of", "updating of" Information indicating the result of the processing described as "setting of", "selection of", "selection of", "input of", "output of" Quot; file " or " database ".

The "file" or "database" is stored in a recording medium such as a disk or a memory.

Information, data, signal values, variable values and parameters stored in a storage medium such as a disk or a memory are read out from the main memory or the cache memory by the CPU 911 through a read / write circuit.

The read information, data, signal values, variable values and parameters are used for CPU operations such as extraction, search, reference, comparison, calculation, calculation, processing, editing, output, printing and display.

Information, data, signal values, and parameter values and parameters are stored in the main memory, registers, cache memory, buffer memory, and the like during the operation of the CPU for extraction, retrieval, reference, comparison, computation, calculation, processing, It is temporarily memorized.

The arrows in the drawings described in Embodiments 1 and 2 mainly represent input and output of data and signals.

Data and signal values may be stored in a memory of RAM 914, a flexible disk of FDD 904, a compact disk of CDD 905, a magnetic disk of magnetic disk device 920, other optical disks, .

Data and signals are transmitted on-line by a bus 912, a signal line, a cable, and other transmission media.

In the description of Embodiments 1 and 2, "~ circuit", "~ device", "~ device", and " .

That is, the operations of the MU 100 and the IED 200 can be understood as a packet processing method by the steps, procedures, and processes shown in the drawings described in the first and second embodiments.

Also, what is described as " part " may be realized by the firmware stored in the ROM 913. [

Alternatively, only software, or hardware such as devices, devices, boards, wiring, or a combination of software and hardware, or a combination with firmware may be used.

Firmware and software are stored as programs on a recording medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, or the like.

The program is read by the CPU 911 and executed by the CPU 911. [

100: MU 101:
102: operation unit 200: IED
201: communication unit 202:
211: MAC 212: visual synchronization unit
213: PHY 221: packet routing unit
222: time synchronization processing section 223: time synchronization packet generation section
300: Communication line 400: Transformer for measuring instrument
500: Transmission line

Claims (10)

And a communication unit for communicating with the packet communication destination apparatus a measurement value packet for notifying the measured measurement value and a time synchronization packet for time synchronization,
Wherein,
And starts transmission of the packet being received to the arithmetic unit at a point of time when packet reception from the packet communication destination apparatus is started,
Detecting type identifier data indicating the type of packet from the packet being received and stopping transmission of a packet being received to the operation unit when it is determined that the packet being received is a time synchronized packet based on the detected type identifier data, Performs processing for time synchronization using the received time synchronization packet,
When it is determined that the packet being received is a measurement value packet based on the type identifier data, the transmission of the packet being received to the operation unit is continued,
The operation unit,
And performs processing on the measurement value packet transmitted from the communication unit
Wherein the communication device is a communication device.
delete The method according to claim 1,
Wherein the communication unit generates a time synchronization packet and transmits the generated time synchronization packet to the packet communication destination apparatus.
The method according to claim 1,
Wherein the communication apparatus communicates a plurality of types of time synchronization packets with the packet communication destination apparatus,
When receiving the time synchronization packet from the packet communication destination apparatus, the communication section generates a time synchronization packet responding to the received time synchronization packet in accordance with the type of the received time synchronization packet
Wherein the communication device is a communication device.
delete delete delete The method according to claim 1,
Wherein the communication unit generates, as a time synchronization packet, a packet for notifying the packet communication destination apparatus of the current time in the communication apparatus.
The method according to claim 1,
Wherein,
Receiving a time synchronization packet from the packet communication destination apparatus,
When the received time synchronization packet is a packet requesting notification of the processing delay time in the communication apparatus, the time synchronization packet received from the packet communication destination apparatus, A packet for notifying the packet communication destination apparatus of a processing delay time from reception of the packet to transmission of a packet responding to the received packet
Wherein the communication device is a communication device.
The method according to claim 1,
Wherein,
Receiving a time synchronization packet from the packet communication destination apparatus,
Wherein the time synchronization packet is a time synchronization packet that responds to the time synchronization packet received from the packet communication destination apparatus when the received time synchronization packet is a packet for notifying the current time in the packet communication destination apparatus, And generates a packet requesting to notify the processing delay time from when the packet is received until when a packet responding to the received packet is transmitted
Wherein the communication device is a communication device.

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