CN102723701A - Remote optical signal locking protection device - Google Patents

Abstract

The invention discloses a remote optical fiber signal blocking protection device, which includes a protection device A and a protection device B which are mutually coupled and connected by communication, wherein the A protection device includes a single-chip microcomputer, a working power supply, a signal conversion unit, a communication unit and a clock unit, The single-chip microcomputer is electrically connected to the working power supply, the signal conversion unit, the communication unit and the clock unit, and the A protection device is connected to the front-stage power transformation protection device through its communication unit; the B protection device includes a single-chip microcomputer, a working power supply , a signal conversion unit, a communication unit and a clock unit, the single-chip microcomputer is electrically connected to the working power supply, the signal conversion unit, the communication unit and the clock unit, and the A protection device is connected to the rear-stage substation protection equipment through its communication unit . The invention reduces investment, makes distribution network protection simple and reliable, and technically solves the problem of selectivity of protection.

Description

Remote fiber optic signal locking protection device

technical field

The invention relates to the field of power grid transformation protection, more specifically, the invention relates to a remote optical fiber signal blocking protection device capable of ensuring real-time and sequential performance.

Background technique

At present, the action coordination between the upper and lower levels of the substation is mainly realized by the time difference. With the promotion and application of distribution network protection, the original level difference setting is becoming more and more difficult, and it is becoming more and more difficult to meet the selective requirements of protection. If the total time is prolonged, the performance of protection will be seriously affected, and it needs to be modified value for the entire system. Another common practice is to install optical fiber longitudinal differential protection. By installing optical fiber longitudinal differential protection devices between the upper and lower levels, the protection selectivity can be realized by using the fault current characteristics inside and outside the area. The disadvantage of this is that the investment is relatively large. , It is also necessary for the timing device to realize the synchronization function, which is troublesome. Therefore, it is of great practical significance to develop a device that does not need to change the existing fixed value principle and does not affect the protection performance.

Contents of the invention

The present invention utilizes the optical fiber resources of the existing power distribution automation to convert traditional electrical signals into optical signals, extend the signal lines through optical fibers, and use signal dialogue to realize the cooperation between protections to ensure the priority action of the protection on the fault side in the area. Leapfrogging will occur.

Specific technical issues to be solved:

Convert traditional electrical signals into optical signals for remote transmission;

Through non-digital or Ethernet communication means, the real-time performance of signal transmission is guaranteed;

By adding the information state of the opposite side to the protection action logic to realize blocking and unlocking, the selective requirements of protection are realized.

Effect of the present invention is as follows:

reduced investment;

Make distribution network protection simple and reliable;

Technically solves the selectivity problem of protection.

Technical effect of the present invention is realized by following technical means:

A remote optical fiber signal blocking protection device, which includes a protection device A and a protection device B connected by mutual coupling and communication, wherein,

The A protection device includes a single-chip microcomputer, a working power supply, a signal conversion unit, a communication unit and a clock unit. The unit is connected to the front-end substation protection equipment through communication;

The B protection device includes a single-chip microcomputer, a working power supply, a signal conversion unit, a communication unit and a clock unit. The unit is connected to the downstream substation protection equipment through communication.

Preferably, the protection device A and the protection device B are optically coupled and communicated through respective signal conversion units and signal conversion units.

Preferably, the A protection device and the B protection device are connected through optical fibers.

Preferably, the A protection device is connected to the front-stage substation protection equipment through RS485 or optical Ethernet, and the B protection device is connected to the rear-stage substation protection equipment through RS485 or optical Ethernet.

Preferably, the single-chip microcomputer is provided with a storage unit for storing the first group of operating state parameters and the first group of clock parameters, and the single-chip microcomputer is provided with a storage unit for storing the second group of operating state parameters and the second group of clock parameters.

The present invention utilizes the optical fiber resources of the existing power distribution automation to convert traditional electrical signals into optical signals, extend the signal lines through optical fibers, and use signal dialogue to realize the cooperation between protections to ensure the priority action of the protection on the fault side in the area. Leapfrogging will occur.

Description of drawings

Detailed implementation of the present invention will be further embodied by the accompanying drawings, wherein:

Fig. 1 is a schematic structural diagram of a remote optical fiber signal blocking protection device of the present invention.

Detailed ways

Referring to Fig. 1, the remote optical fiber signal blocking protection device includes a protection device 100 and a protection device B 200 connected by mutual coupling and communication, wherein,

A protection device 100 includes a single-chip microcomputer 110, a working power supply 120, a signal conversion unit 130, a communication unit 140 and a clock unit 150, and the single-chip microcomputer 110 is electrically connected to the working power supply 120, the signal conversion unit 130, the communication unit 140 and the clock unit 150, respectively, The A protection device 100 is communicatively connected to the front-end substation protection equipment through its communication unit 140;

B The protection device 200 includes a single-chip microcomputer 210, a working power supply 220, a signal conversion unit 230, a communication unit 240 and a clock unit 250, and the single-chip microcomputer 210 is electrically connected to the working power supply 220, the signal conversion unit 230, the communication unit 240 and the clock unit 250 respectively, The A protection device 200 is communicatively connected to the downstream substation protection equipment through its communication unit 240 .

Further, the protection device A 100 and the protection device B 200 are optically coupled and communicated through their respective signal conversion units 130 and 140 .

Further, the protection device A 100 and the protection device B 200 are connected through optical fibers.

Furthermore, the A protection device 100 is connected to the front-stage substation protection equipment through RS485 or optical Ethernet, and the B protection device 200 is connected to the rear-stage substation protection equipment through RS485 or optical Ethernet.

Further, the single-chip microcomputer 110 is provided with a storage unit 111 for storing the first set of action state parameters and the first set of clock parameters, and the single-chip microcomputer 210 is provided with a storage unit 211 for storing the second set of action state parameters and the second set of clock parameters .

In a preferred embodiment of the present invention, the A protection device 100 receives the first set of state parameters of the front-end substation protection equipment through its communication unit 140, and forms a corresponding first set of clock parameters according to this set of state parameters;

The single-chip microcomputer 110 processes the parameters, and converts them into optical fiber medium signals through the signal conversion unit 130, and sends them to the B protection device 200;

The protection device 200 of B receives the second set of state parameters of the downstream substation protection equipment through its communication unit 240, and forms a corresponding second set of clock parameters according to this set of state parameters;

The single-chip microcomputer 210 compares the first group of clock parameters received with the generated second group of clock parameters, and generates a return value, which is converted into an optical signal by its signal conversion unit 230 and then fed back to the single-chip microcomputer 110 of the A protection device 100;

For example, according to the return value, the status of the front-level protection and the subsequent-level protection is judged. If the previous-level action is better than the latter-level action, the corresponding action in the blocking state will be realized.

The above are only preferred embodiments of the present invention, and are not intended to limit the technical solution of the present invention. It should be understood that the technical spirit of the present invention is covered within the technical scope of the appended claims of the present invention.

Claims (5)

1. remote fiber signal block protective device is characterized in that: it comprises A protective device and the B protective device that the communication that intercouples connects, wherein,

Said A protective device comprises single-chip microcomputer, working power, signal conversion unit, communication unit and clock unit; Said single-chip microcomputer is electrically connected to working power, signal conversion unit, communication unit and clock unit respectively, and said A protective device is to be connected to prime power transformation protection equipment through its communication unit communication;

Said B protective device comprises single-chip microcomputer, working power, signal conversion unit, communication unit and clock unit; Said single-chip microcomputer is electrically connected to working power, signal conversion unit, communication unit and clock unit respectively, and said A protective device is to be connected to back level power transformation protection equipment through its communication unit communication.

2. remote fiber signal block protective device as claimed in claim 1 is characterized in that: between said A protective device and the B protective device be respectively the signal conversion unit through separately and signal conversion unit in addition the optical coupling communication be connected.

3. according to claim 1 or claim 2 remote fiber signal block protective device is characterized in that: between said A protective device and the B protective device is to be connected through optical fiber.

4. remote fiber signal block protective device as claimed in claim 1; It is characterized in that: said A protective device is to be connected to prime power transformation protection equipment through RS485 or luminiferous ether mode, and said B protective device is to be connected to back level power transformation protection equipment through RS485 or luminiferous ether mode.

5. remote fiber signal block protective device as claimed in claim 1; It is characterized in that: be provided with the memory cell of first group of operate condition parameter of storage and first group of timing parameter in the said single-chip microcomputer, be provided with the memory cell of second group of operate condition parameter of storage and second group of timing parameter in the said single-chip microcomputer.

Images