CN111799884A - Power supply switching device for user metering and collecting terminal - Google Patents

Abstract

The invention relates to a double-loop power supply matching device, in particular to a power supply switching device of a user metering acquisition terminal. The problem of present two return circuits have information acquisition equipment for a long time not electrified influence equipment clock accuracy and data save etc. technical problem is solved. The user measures the power switching device of the acquisition terminal, including 3 groups of terminal connections, 3 intermediate relays; the intermediate relays are all intermediate relays with four groups of normally open and normally closed contacts and comprise a # 1 relay, a # 2 relay and a # 3 relay; the 3 groups of wiring terminals are respectively used as A1 and C1 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the main supply loop, A2 and C2 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the standby supply loop, and A 'and C' terminals connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter.

Description

User metering collection terminal power switching device

technical field

The invention relates to a dual-circuit power supply supporting device, in particular to a power switching device for a user metering and collecting terminal.

Background technique

The realization of the goal of full coverage, full collection and full application of the electricity information collection system is one of the key tasks of the current electric power enterprise marketing, and also one of the basic tasks of the production and operation activities of the electric power service company. Remote meter reading is one of the most basic functions in the load management system, and plays an important role in the recovery of electricity bills, the completion of business indicators and statistical analysis. In recent years, some users have used the main power supply for common use, and the backup power supply is not used frequently, causing the meter terminal to lose power, which affects the acquisition success rate. For example, in a residential area with dual power supply, the main power supply is the normal power supply, and the backup power supply is only reversed when the main power supply is out of power (the main and standby power supplies are blocked) to supply important loads in the community. Due to the blocking of the main and backup power supply feeder gates, the high-voltage metering point meter and terminal on the main power supply side are normal, and the high-voltage metering point meter and terminal on the standby power supply side are powered off. For dual power users such as highways, the main power supply and the backup power supply have the same power supply capacity and are periodically reversed. Due to the blocking of the main and backup power supply line knife gates, the high-voltage metering point meter terminal on one side is normal, and the high-voltage metering point meter and terminal on the other side lose power. In the statistics of terminal upload data, dual-circuit users always have a set of terminals in standby power-off state, that is, outage users, and need to be transferred to the outage user management section. During this period, if the user's power circuit is frequently switched, the two sets of terminals will also be operated and managed accordingly, and the data of the electric energy meter cannot be monitored in real time, which will affect the timeliness of the negative control master station's call for the terminal data, and also affect the various item collection metrics.

The collection terminal is an important part of the electricity consumption information collection system, which is used for real-time monitoring of electricity collection for users. Because the type III special transformer acquisition terminal adopts a single power supply access (using the secondary voltage of the voltage transformer) in the power supply mode, there is no auxiliary power supply, when the user's main supply line is repaired or faulty in the dual-circuit power supply mode, the user adopts the If the backup circuit is powered, the main negative control terminal will lose its working power, resulting in the failure of the energy meter data to be uploaded normally through the negative control terminal. Because the acquisition device is working in an abnormal state, the battery of the metering device is fed without electricity for a long time, which affects the accuracy of the equipment clock and the preservation of data. Moreover, the acquisition device is not charged, which affects the normal operation of the transmission card of the acquisition device, thereby affecting the data acquisition. The success rate and the completion of the "three complete" indicators. When the negative control terminal is disconnected, the system loses the supervision of the user's electricity load, and the master station determines that the terminal is faulty and needs to be checked and dealt with on site. When the user switches the main power supply to the backup power supply, the power supply required by the negative control terminal needs to be adjusted by the staff at the scene, which also increases the maintenance workload of the staff.

In view of the technical problems that the current dual-circuit information acquisition equipment is not charged for a long time, which affects the accuracy of the equipment clock and data storage, and the workload increases during the main-standby switching, it is necessary to develop a power switching device to solve the above problems.

SUMMARY OF THE INVENTION

The invention provides a user metering and collecting terminal power switching device to solve the technical problems of the current dual-loop information acquisition equipment being uncharged for a long time, which affects the accuracy of the equipment clock and data preservation.

The present invention is realized by adopting the following technical solutions: a user metering and collecting terminal power supply switching device includes 3 groups of wiring terminals and 3 intermediate relays; the intermediate relays are all intermediate relays with four groups of normally open and normally closed contacts, including 1# Relays, 2# relays and 3# relays; 3 groups of terminals are used as A1 and C1 terminals for measuring PT secondary voltage phase A and C in the main supply circuit, and A1 and C1 terminals for measuring PT secondary voltage in the standby supply circuit. The A2 and C2 terminals of the terminal, and the A' and C' terminals connected to the A-phase and C-phase of the acquisition terminal and the auxiliary power supply terminals of the electric energy meter;

The main supply input A1 and C1 are connected to both ends of the coil of the 1# relay through the air switch, and A1 is connected to the first group of normally open terminals of the 1# relay and the first group of common terminals of the 2# relay. A group of common terminals is connected to one end of the 2# relay coil, and the first group of normally open terminals of the 2# relay is connected to the first group of normally closed terminals of the 3# relay; C1 is connected to the other end of the 2# relay coil and the second group of the 2# relay. On the group common terminal, the second group of normally open terminals of 2# relay is connected to the second group of normally closed terminals of 3# relay;

After the spare input A2 and C2 pass through the air switch, A2 is connected to the third group of normally open terminals of the 3# relay and the second group of common terminals of the 1# relay, and the second group of normally closed terminals of the 1# relay is connected to the 3# relay. At one end of the coil, the third group of common terminals of the 3# relay is connected to the third group of normally closed terminals of the 2# relay; C2 is connected to the other end of the 3# relay coil and the fourth group of normally open terminals of the 3# relay, and the 3# relay The fourth group of common terminals is connected to the fourth group of normally closed terminals of the 2# relay;

The switching output A' is connected in parallel to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay; C' is connected in parallel to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay.

Install the terminal power supply switching device for the dual-circuit power supply users who have installed the terminal equipment of the load management system, so that the dual-circuit users can switch the circuit power consumption without affecting the function of remote automatic meter reading, and improve the function construction of the load management system. , to improve the work efficiency of the power supply company's negative control user meter reading charge settlement. Since the GPRS load management terminal uses a single power supply in the power supply mode, when the user's main power supply line is repaired or faulty in the dual-circuit power supply mode, when the user uses the backup circuit to supply power, the negative control terminal will lose its working power, resulting in The energy meter data cannot be uploaded normally through the negative control terminal, and at the same time, the supervision of the user's electricity load is lost.

When the negative control terminal is disconnected and the data cannot be monitored, the master station determines that the terminal is faulty and needs to be checked and processed on site. When the user switches the main power supply to the backup power supply, the power supply required by the negative control terminal needs to be adjusted by the staff on site, which will cause the data to be unable to be uploaded in time and increase the maintenance workload of the staff, and also make the negative control terminal normal maintenance work plan Can't be done well.

In the statistics of terminal upload data, dual-circuit users always have a set of terminals in standby power-off state, that is, outage users, and need to be transferred to the outage user management section. If the user's power circuit is frequently switched during this period, the two sets of terminals are also managed correspondingly for operation and shutdown. The data of the electric energy meter cannot be supervised in real time, which affects the timeliness of the negative control master station's call and measurement data for the terminal. After the power switching device of the present invention is installed, the uninterrupted power supply of the power supply of the dual-circuit user negative control terminal can be realized, and the negative control terminal can be actively managed, and the dual-circuit user negative control terminal can always run online.

Further, the relay coils are connected with LED live indicator lights in parallel; both ends of the 1# relay coil are connected with a main supply voltage meter; both ends of the 3# relay coil are connected with a backup supply voltage meter.

The remote monitoring module is taken from the normally open and normally closed of each group of 1# and 3# relays to judge the operation status of the main supply and backup relays, and send the master station personnel through SMS.

Beneficial effects of the present invention:

1. Innovatively solve the realization of the goals of full coverage, full collection, and full application

The "dual power supply switching device" mentioned in the present invention does not currently have a meter terminal with a dual power supply switching device in the equipment sequence of the State Grid Corporation of China. Therefore, in order to achieve the goal of "three completes" and improve the success rate of acquisition, combined with the existing meter terminals, a dual power switching device has been developed. According to the data of on-site testing of the equipment and operating status monitoring, the innovative solution to the acquisition The realization of full coverage, full collection, and full application goals.

2. Changed the previous power supply mode

A dual power supply switching device is added, relays 1 and 2 are always on when the main power supply is powered, and relay 3 is always on when the backup power supply is powered. The difference between this device and the ordinary meter and terminal is that the ordinary meter and terminal provide power through the access line, while the meter and terminal with a dual power switching device are added to increase the power supply capability. The power supply of the electric energy meter is powered by the line and the auxiliary power supply. The two power supply modes should be independent of each other and not affect each other, and can be automatically converted without interruption.

3. Improve the frequent start and stop of the user's electrical equipment

Due to the user's operating mode, the electric energy meter installed on site has been in the running state of one channel of electricity, one channel of deactivation, or two channels of frequent start and stop switching for a long time, resulting in the failure of the meter and the acquisition equipment to work normally, which directly affects the collection of electricity consumption information. The normal progress of the project will affect the completion of the "three complete" goals. Through a large number of analysis and investigation of the on-site situation, taking the power supply of the acquisition equipment as a breakthrough, the application of the dual power switching device has solved the abnormal phenomenon of the equipment in the state of power failure or frequent start and stop of the metering device. The shutdown status is fully monitored without dead ends.

4. Improve the success rate of collection

Dual power supplies, one supply and one backup, users have always been able to collect only one meter. When the user disconnects the incoming line switch or a certain line is out of power for maintenance or power failure, the working power of the meter is missing and cannot be collected and communicated normally. We installed a dual power switching device to solve the problem that the standby meter and the terminal are not powered, and conducted experiments on the user to ensure that the main and standby energy meters and the terminal are both powered, improving the success rate of acquisition.

5. Solve the blind area of data transmission

Through the research on the operation of "dual power supply switching device" users, the blind area of "dual power supply" acquisition is solved, and the problem that dual power supply users cannot perform data transmission normally due to the operation mode. The device adds a running switching indicator light and a digital voltmeter (LED display), which is convenient for on-site personnel to check visually. The relay coil is connected with an LED live indicator light, so that the on-site personnel can quickly judge the operation of the device. When the main and backup input power supply fails, the remote monitoring module sends out a text message alarm or a voice alarm, which is transmitted to the mobile phone platform of the corresponding personnel to inform the real-time operation of the sending power switching device.

6. Improve the stability of field equipment

The implementation of the project ensures that the "dual power" users can monitor the operation status of the on-site metering device as long as the power outage does not occur in the whole plant, and solve the abnormality of the metering device in the state of power failure or frequent start and stop. phenomenon occurs. The workload of on-site maintenance is greatly reduced, and the workload of metering personnel who must go to the site for maintenance due to the change of the user's operation mode is greatly reduced, and the monitoring effect is greatly improved.

Description of drawings

Figure 1 is one of the wiring diagrams of the power switching device.

Figure 2 The second wiring diagram of the power switching device.

Figure 3 illustrates the operation of the relay.

Figure 4 One of the schematic diagrams of the terminal wiring of the metering point.

Figure 5. The second schematic diagram of the terminal wiring of the metering point.

Detailed ways

The terminals A1 and C1 of the switching device of the acquisition power supply are connected to the A-phase and C-phase of the secondary voltage of the measurement PT of the main supply circuit; The A-phase, C-phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter.

The acquisition power switching device uses three intermediate relays (110V coils) with four groups of normally open and normally closed contacts to work. Model of intermediate relay: JZX-22F(D)/4Z-110V.

As shown in Figures 1 and 2: the main supply input A1 and C1 are connected to both ends of the 1# relay 1 coil through the air switch, and A1 is connected to the first group of normally open terminals of the 1# relay and the first group of common terminals of the 2# relay. The first group of common terminals of the 1# relay is connected to one end of the 2# relay coil (left), the first group of normally open terminals of the 2# relay is connected to the first group of normally closed terminals of the 3# relay; C1 is connected to one end of the 2# relay coil ( Right) and the second group of common terminals of the 2# relay, the second group of normally open terminals of the 2# relay is connected to the second group of normally closed terminals of the 3# relay.

The spare input A2 and C2 are connected through the air switch. A2 is connected to the third group of normally open terminals of the 3# relay and the second group of common terminals of the 1# relay, and the second group of normally closed terminals of the 1# relay is connected to one end of the 3# relay coil. (left), the third group of common terminals of the 3# relay is connected to the third group of normally closed terminals of the 2# relay; C2 is connected to one end of the 3# relay coil (right) and the fourth group of normally open terminals of the 3# relay, 3 #The fourth group of common terminals of the relay is connected to the fourth group of normally closed terminals of the 2# relay.

The switching output A' is connected in parallel to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay; C' is connected in parallel to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay.

Combined with Figure 3, the main power supply power supply: 1, 2# relays are always on; the backup power supply power supply: 3# relay is always on; the main power supply and backup power supply are both charged, and the main power supply is output by default.

Dual-circuit users are powered by the main supply circuit, and when the backup supply is powered off: the main supply voltage A1, C1 input 1# relay coil is energized, the first group of normally open contacts of the 1# relay is closed, so that the 2# relay coil is energized, and the 2# relay first , The second group of normally open contact action is closed. A1 passes through the first group of normally open contacts of 2# relay - the first group of normally closed contacts of 3# relay - the switching device outputs A' terminal; C1 passes through the second group of normally open contacts of 2# relay - the second group of 3# relay Normally closed contact - the switching device outputs the C' terminal, at this time A', C' supply power to the electric energy meter and the collection terminal.

1) Dual-circuit user backup power supply loop power supply, when the main power supply is out of power: the backup power supply voltage A2 is energized through the second group of normally closed contacts of the 1# relay and C2 input to the 3# relay coil, and the first to fourth groups of normally closed contacts of the 3# relay are energized The action is disconnected, and the normally open contact action is closed. A2 passes through the third group of normally open contacts of the 3# relay - the third group of normally closed contacts of the 2# relay - the switching device outputs the A' terminal; C2 passes through the fourth group of normally open contacts of the 3# relay - the fourth group of the 2# relay Normally closed contact - the switching device outputs the C' terminal, at this time A', C' supply power to the electric energy meter and the collection terminal.

2) When both the main and backup supply circuits of the dual-circuit user are running with electricity: the 1# relay coil is not connected to any contact in series, and the 3# relay coil is connected in series with the second group of normally closed contacts of the 1# relay, so the main supply voltage A1 and C1 are input after 1 #The relay coil is energized, the second group of normally closed contacts of the 1# relay is disconnected to form an interlock, the 3# relay coil cannot be energized, and the corresponding normally open and normally closed contacts cannot be activated, so the dual-circuit user main and backup supply circuits are both live when running , by default the main supply input voltage is the switching output.

The installation of a set of automatic power supply switching device for dual-circuit users can realize the uninterrupted power supply of the dual-circuit user negative control terminal power supply, timely and effectively solve the power switching problem of the dual-power user negative control terminal power supply, and avoid the terminal shutdown caused by non-fault reasons. transport. The device is simple in structure and low in cost. The main component is a relay. The relay trip coil monitors the voltage signals of the two power supplies in real time, and sends out control signals in real time according to the actual situation to realize the automatic switching of the main power supply and the auxiliary power supply. After the device is used, the terminal power supply is switched after the user turns off the gate, and it can still work normally, and the maintenance personnel do not need to go to the site for maintenance. As a result, the workload of maintenance personnel is greatly reduced, the cost of enterprises is saved, and the safety risks of on-site operations are reduced.

Through the dual-circuit power supply mode, the user can install the power supply switching device, so that the terminal of the dual-circuit user can directly switch the power supply when the power supply is switched, which ensures that the "dual power supply" user can control the on-site metering device as long as there is no power failure. The operation status is monitored, which solves the loss of remote meter reading data of the system in the state of power failure or frequent start and stop of the metering device. At the same time, the workload of on-site maintenance is greatly reduced, and the workload of metering personnel who must go to the site for maintenance due to changes in the user's operation mode is greatly improved, and the monitoring effect is greatly improved. No matter which channel of equipment starts, stops, and operates, it is monitored throughout the entire process without dead ends, and the quality of collected data is effectively guaranteed, providing guarantees for the realization of the "three complete" goals.

Claims (7)

1. The user metering acquisition terminal power supply switching device is characterized by comprising 3 groups of connecting terminals and 3 intermediate relays, wherein the intermediate relays are four groups of normally open and normally closed intermediate relays and comprise a # 1 relay, a # 2 relay and a # 3 relay; the 3 groups of wiring terminals are respectively used as A1 and C1 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the main supply loop, A2 and C2 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the standby supply loop, and A 'and C' terminals connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter;

the main supply inputs A1 and C1 are connected to two ends of a coil of the 1# relay through an air switch, meanwhile, A1 is connected in parallel to a first group of normally open terminals of the 1# relay and a first group of common terminals of the 2# relay, the first group of common terminals of the 1# relay is connected to one end of the coil of the 2# relay, and the first group of normally open terminals of the 2# relay is connected to a first group of normally closed terminals of the 3# relay; c1 is connected in parallel with the other end of the coil of the 2# relay and the second group of common terminals of the 2# relay, and the second group of normally open terminals of the 2# relay is connected to the second group of normally closed terminals of the 3# relay;

after the standby power input A2 and C2 pass through an air switch, A2 is connected to a third group of normally open terminals of the 3# relay and a second group of common terminals of the 1# relay, a second group of normally closed terminals of the 1# relay are connected to one end of a coil of the 3# relay, and a third group of common terminals of the 3# relay are connected to a third group of normally closed terminals of the 2# relay; c2 is connected in parallel with the other end of the coil of the 3# relay and the fourth normally open terminal of the 3# relay, and the common terminal of the fourth group of the 3# relay is connected with the fourth normally closed terminal of the 2# relay;

the switching output A' is connected to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay in parallel; c' is connected to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay in parallel.

2. The user metering collection terminal power switching device of claim 1, wherein the relay coils are connected in parallel with LED live indicator lamps.

3. The user metering acquisition terminal power switching device of claim 1 or 2, wherein a main supply voltage meter is connected to two ends of a 1# relay coil; and two ends of the 3# relay coil are connected with a standby power supply voltmeter.

4. The power switching device of the user metering and collecting terminal as claimed in claim 1 or 2, wherein the collecting terminal and the electric energy meter are provided with auxiliary power supplies, and the auxiliary power supplies are supplied by terminals A 'and C'.

5. The user metering acquisition terminal power switching device of claim 3 wherein the acquisition terminal and the electric energy meter are provided with auxiliary power supplies, and the auxiliary power supplies are supplied by the terminals A 'and C'.

6. The power switching device of the user metering and collecting terminal as claimed in claim 1 or 2, wherein the model of the intermediate relay is JZX-22F (D)/4Z-110V.

7. The power switching device of the user metering and collecting terminal as claimed in claim 4, wherein the model of the intermediate relay is JZX-22F (D)/4Z-110V.

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