CN103532084B - The involution loop of accident resultant signal in microcomputer type relay protection loop - Google Patents

Abstract

The present invention provides a return circuit for the total accident signal in the relay protection circuit of a microcomputer, including five anti-locks, a control handle, an intermediate relay, a circuit breaker operation circuit, a positive power supply, a negative power supply and a reset circuit in the circuit breaker control circuit. button; the positive power supply is electrically connected to the input terminal of the control handle through the five-proof lock; the first opening output terminal of the control handle, the closing input terminal of the intermediate relay and the closing input terminal of the circuit breaker operating circuit are in line; Both the closing output terminal and the opening output terminal are connected to the negative power supply; the No. 1 and No. 4 terminals of the reset button, the second opening output terminal of the control handle and the opening input terminal of the intermediate relay are in the same line; the No. 2 wiring of the reset button The terminal is connected to the positive power supply, and the No. 3 terminal is connected to the opening input terminal of the circuit breaker operating circuit. The invention can enable workers to quickly and conveniently reset the accident master signal, without causing accidents such as misoperation, misclassification and misoperation, etc., so that the substation can quickly enter into normal operation.

Description

Resetting Circuit of Accident General Signal in Microcomputer Relay Protection Circuit

technical field

The invention relates to a return circuit of the general accident signal of a transformer substation, in particular to a return circuit of the general accident signal in a relay protection circuit of a microcomputer.

Background technique

In the microcomputer relay protection circuit of substation, the total accident signal is an important and commonly used monitoring signal. When the circuit breaker of the substation is disconnected due to fault tripping or stealth trip, the substation cannot work normally. Since the position of the circuit breaker operation control switch does not correspond to the actual position of the circuit breaker, when the circuit breaker in the substation is disconnected due to fault tripping or sneak tripping, etc., the relay protection circuit will send a general accident signal to the background monitoring system, indicating that the circuit breaker has occurred Faults require immediate query processing. As shown in Figure 1, the positive power + KM is connected to the normally open contact of the intermediate relay KKJ. The normally open contact of the intermediate relay KKJ is connected with the normally open contact of the circuit breaker trip position relay TWJ. The normally open contact of the circuit breaker trip position relay TWJ is connected with the protection measurement and control device. When the substation circuit breaker is disconnected due to fault tripping or stealth tripping, etc., the positive power supply + KM sends a signal to the background monitoring system through the normally open contact of the intermediate relay KKJ, the normally open contact of the circuit breaker trip position relay TWJ and the protection measurement and control device. General accident signal. A substation has multiple circuit breaker bays, and when each circuit breaker bay fails and disconnects, it will send a general accident signal to the background monitoring system. Several accident total signals that occur at intervals of several circuit breakers at the same time will be combined and sent to the background monitoring system. The combined accident total signal is called the total substation accident total signal. Both the accident total signal and the total substation accident total signal are referred to as the accident total signal below. After the background monitoring system gets the general signal of the accident, it must reset the general signal of the accident to restore the normal operation of the substation. Substation staff generally adopt two methods when dealing with the recovery of the general signal of the accident. The first is to close the circuit breaker directly, changing the position of the circuit breaker to the "closed" position. The second is to open the circuit breaker that has been separated due to a fault again, and the position of the circuit breaker remains unchanged when it is opened again, but the position of the circuit breaker operating switch is changed from "after closing" to "after opening". Location. Both of the above two methods can realize the correspondence between the position of the circuit breaker and the position of the operation switch, so that the general signal of the accident can be restored and the substation can resume normal operation. The first method of resetting the accident total signal is only applicable to the circuit breaker closing and power transmission when the faults of each circuit breaker compartment have been eliminated and can work normally, so as to realize the resetting of the accident total signal. The second kind of reset work on the accident master signal is only applicable to the fault of the circuit breaker bay which has been received and has entered the processing stage although the fault of the circuit breaker bay cannot be eliminated immediately and the circuit breaker bay cannot work normally. Resetting the total accident signal, after resetting the total accident signal, the total accident signal of all substations has been reset, and the substation can work normally at this time. At this time, if other circuit breakers in the substation fail to trip, they can continue to send the total accident signal to the background monitoring system and cause the total accident signal of the whole station to act again. The second above-mentioned circuit breaker opening operation for the reset work of the accident general signal is to open the circuit breaker again on the circuit breaker that is already in the opening state. This operation method is used in the high-performance five-proof lock WF electronic The system cannot pass the anti-misoperation process, that is, the contacts of the five-proof lock WF cannot be connected. If you want to pass the anti-misoperation process on the five-proof lock WF electronic system, you must unlock the five-proof lock WF electronic system. However, the authorization procedure for the unlocking operation of the five-proof lock WF electronic system is very complicated and cumbersome. For example, the substation staff can also reset the total accident signal by short-circuiting the five-proof lock WF contacts for convenience, but this method is an illegal operation, and it is easy to cause the circuit breaker to run in the wrong interval and cause a major accident.

Contents of the invention

The purpose of the present invention is to provide a reset circuit for the total accident signal in the relay protection circuit of a microcomputer, the reset circuit can enable the substation staff to quickly and conveniently reset the total accident signal, and the reset work will not Accidents such as misoperation and misassignment and misoperation of circuit breakers are caused, so that the substation can enter normal work quickly and effectively guarantee the power supply.

The technical solution of the present invention is: the reset circuit of the total accident signal in the relay protection circuit of the microcomputer of the present invention, including the five-proof lock WF, the control handle KK, the intermediate relay KKJ, and the circuit breaker operation circuit breaker control circuit. circuit, positive power supply +KM, negative power supply -KM; the five anti-lock WF has an input terminal and an output terminal; the control handle KK has an input terminal, a first opening output terminal and a second opening output terminal; the intermediate relay KKJ has Closing input terminal, closing output terminal, opening input terminal and opening output terminal; circuit breaker operation circuit has closing input terminal and opening input terminal;

The positive power supply + KM is electrically connected to the input terminal of the five-proof lock WF, and the output terminal of the five-proof lock WF is electrically connected to the input terminal of the control handle KK; the first opening output terminal of the control handle KK, and the closing input terminal of the intermediate relay KKJ And the closing input terminal of the circuit breaker operating circuit is in line; the closing output terminal and the opening output terminal of the intermediate relay KKJ are electrically connected to the negative power supply -KM; its structural characteristics are:

Also includes a reset button FGAN; the reset button FGAN includes a normally open contact and a normally closed contact; the normally open contact of the reset button FGAN has terminals No. 2 and No. 4; the normally closed contact of the reset button FGAN has 1 terminals No. 1 and No. 3; terminal No. 1 of the reset button FGAN, terminal No. 4 of the reset button FGAN, the second opening output terminal of the control handle KK, and the opening input terminal of the intermediate relay KKJ are all in line; the reset button FGAN The No. 2 terminal of the FGAN is electrically connected to the positive power supply +KM; the No. 3 terminal of the reset button FGAN is electrically connected to the opening input terminal of the circuit breaker operating circuit.

The present invention has positive effects: (1) The reset circuit of the accident total signal in the microcomputer relay protection circuit of the present invention can enable the substation staff to quickly, conveniently and quickly reset the accident total signal, and the reset The work will not cause accidents such as misoperation and misdivision and misoperation, so that the substation can enter normal work quickly and effectively guarantee the power supply. (2) The reset circuit of the accident general signal in the relay protection circuit of the microcomputer of the present invention has simple structure, low cost, convenient installation and easy popularization.

Description of drawings

Figure 1 is a schematic diagram of the principle of the accident total signal circuit in the relay protection circuit of the microcomputer;

Fig. 2 is the electrical structure schematic diagram of the present invention;

Fig. 3 is a wiring diagram of each terminal of the control handle, the intermediate relay, the circuit breaker operating circuit and the reset button in Fig. 2 .

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

(Example 1)

In the reset circuit of the total accident signal in the microcomputer relay protection circuit of this embodiment, take the microcomputer relay protection circuit of the line protection measurement and control device of the model NSL641 produced by Nanjing Guodian Nansi Electric Co., Ltd. The figure illustrates the specific implementation of this embodiment:

See Fig. 1 to Fig. 3, the return circuit of the total accident signal in the relay protection circuit of the microcomputer of this embodiment, mainly consists of the five anti-lock WF, the control handle KK, the intermediate relay KKJ, the circuit breaker and the circuit breaker control circuit. It is composed of device operation circuit, positive power supply +KM, negative power supply -KM and reset button FGAN. The five-proof lock WF has input and output terminals; the control handle KK has terminals 1 to 20, of which terminal 17 is the input terminal, terminal 2 is the first opening output terminal, and terminal 4 is the second terminal. Opening output terminal; the intermediate relay KKJ has terminals 1 to 12, of which terminal 1 is the input terminal for closing, terminal 7 is the input terminal for opening, terminal 6 is the output terminal for closing, and terminal 12 is The terminal is the opening output terminal; the circuit breaker operation circuit has terminals No. 7 and No. 37, among which, terminal No. 7 is the closing input terminal, and terminal No. 37 is the opening input terminal; the reset button FGAN is controlled by the normally open contact. The normally open contact of the reset button FGAN has terminals No. 2 and No. 4; the normally closed contact of the reset button FGAN has terminals No. 1 and No. 3. In this embodiment, the reset button FAGN preferably adopts the LAY50 flat head button switch produced by Shanghai Shuangke Electric Company.

The positive power supply + KM is electrically connected to the input terminal of the five-proof lock WF, and the output terminal of the five-proof lock WF is electrically connected to the input terminal of the control handle KK (that is, terminal 17); the first opening output terminal of the control handle KK (2 No. terminal), the closing input terminal of the intermediate relay KKJ (No. 1 terminal) and the closing input terminal (No. 7 terminal) of the circuit breaker operating circuit are in line; terminal) and the opening output terminal (No. 12 terminal) are electrically connected to the negative power supply -KM; the second opening output terminal of the control handle KK (No. 4 terminal), the opening input terminal of the intermediate relay KKJ (No. 7 terminal), the No. 1 terminal of the reset button FGAN and the No. 4 terminal of the reset button FGAN are in line; the No. 2 terminal of the reset button FGAN is electrically connected to the positive power supply + KM; the No. 3 terminal of the reset button FGAN is connected to the open circuit It is electrically connected to the opening input terminal (No. 37 terminal) of the switch operation circuit.

The operating principle of the return circuit of the accident total signal in the microcomputer relay protection circuit of the present embodiment is briefly described as follows:

Under normal circumstances, the No. 1 and No. 3 terminals of the normally closed contact of the reset button FGAN are in the connected state, and the No. 2 and No. 4 terminals of the normally open contact of the reset button FGAN are in the disconnected state; When the breaker in the substation normally transmits power at intervals, the contacts of the five-proof lock WF are in a connected state. The control handle KK closes the circuit breaker, that is, the input terminal of the control handle KK (ie, terminal 17) and terminal 18 are connected; at the same time, the terminal 1 and terminal 2 of the control handle KK are at the moment of closing the circuit breaker It is also connected; the positive power supply +KM is connected to the closing input terminal of the circuit breaker operating circuit (that is, terminal 7). The positive power supply +KM is also connected to the closing input terminal of the intermediate relay KKJ (that is, terminal 1). At this time, the control handle KKJ is in the state of "after closing". The relay protection circuit at this time is shown in Figure 1: the normally open contact of the intermediate relay KKJ is connected. The normally closed contacts of the circuit breaker trip position relay TWJ are open. At this time, the substation is in normal working condition.

When the substation circuit breaker is disconnected due to fault tripping or sneak tripping, the control handle KKJ is still in the "closed" state. But the circuit breaker is in the opening position, the normally closed contact of the circuit breaker trip position relay TWJ is connected, and the circuit breaker sends out a general accident signal. At this time, the substation staff needs to reset the general signal of the accident. So the substation staff pressed the reset button FGAN. After pressing the reset button FGAN, the normally closed contacts of the reset button FGAN (that is, terminal 1 and terminal 3) are disconnected first, and after the normally closed contacts 1 and 3 of the reset button FGAN are disconnected, the positive power supply +KM and The opening input terminal of the operating circuit of the circuit breaker (that is, terminal 37) is disconnected, and the circuit breaker is opened at this time. At this time, the normally open contacts of the reset button FGAN (that is, terminals No. 2 and No. 4) are connected; the positive power supply + KM passes through the normally open contacts 2 and 4 of the reset button FGAN connected to the opening input terminal of the intermediate relay KKJ (that is, terminal No. 7) are connected, so that the intermediate relay KKJ is converted to the "after opening" position. At this time, the normally open contact of the intermediate relay KKJ in the relay protection circuit in Fig. 1 is disconnected. After the normally open contact of the intermediate relay KKJ is disconnected, the total accident signal circuit is disconnected. Thereby realizing the recovery of the total signal of the accident. The function of the normally closed contacts 1 and 3 of the reset button FGAN is to disconnect the normally closed contacts 1 and 3 when the reset button FGAN is pressed. At this time, the circuit breaker opening circuit is disconnected, and the positive power supply +KM is disconnected from the opening input terminal 37 of the circuit breaker operating circuit. Disconnecting the positive power supply +KM from the opening input terminal 37 of the circuit breaker operating circuit can prevent the circuit breaker in the closed state from being mistakenly opened when the reset button of the operation interval is pressed by mistake.

A substation usually has multiple breaker bays, so a reset button FGAN is installed on each breaker bay. The circuit breaker compartment that is disconnected due to a fault needs to reset the general signal of the accident by pressing the reset button FGAN. There is no need to press the reset button FGAN for breaker bays that have not failed to open. When substation workers press the reset button, they often press the wrong reset button FGAN. If there is no normally closed contact 1, 3, the switch of the circuit breaker compartment that is pressed by the fault reset button FGAN will be separated, resulting in a misoperation accident. Therefore design wherein normally closed contact 1,3 is disconnected when pressing error reset button FGAN in the present embodiment. Disconnect the positive power supply +KM from the opening input terminal 37 of the circuit breaker operating circuit, and a "control circuit disconnection" signal will be sent at this operating interval. In this way, accidents such as misoperation of the operation switch caused by misoperation will not be caused.

The above embodiments are descriptions of specific implementations of the present invention, rather than limitations of the present invention. Those skilled in the relevant technical fields can also make various transformations and changes without departing from the spirit and scope of the present invention. Corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the patent protection scope of the present invention.

Claims (1)

1. A reset circuit for the total signal of the accident in the relay protection circuit of a microcomputer, including the five-proof lock WF, the control handle KK, the intermediate relay KKJ, the circuit breaker operating circuit, the positive power supply + KM, Negative power supply-KM; the five anti-lock WF has an input terminal and an output terminal; the control handle KK has an input terminal, a first opening output terminal and a second opening output terminal; the intermediate relay KKJ has a closing input terminal, a closing Gate output terminal, opening input terminal and opening output terminal; circuit breaker operation circuit has closing input terminal and opening input terminal; The positive power supply + KM is electrically connected to the input terminal of the five-proof lock WF, and the output terminal of the five-proof lock WF is electrically connected to the input terminal of the control handle KK; the first opening output terminal of the control handle KK, and the closing input terminal of the intermediate relay KKJ And the closing input terminal of the circuit breaker operating circuit is in line; the closing output terminal and the opening output terminal of the intermediate relay KKJ are electrically connected to the negative power supply -KM; it is characterized in that: Also includes a reset button FGAN; the reset button FGAN includes a normally open contact and a normally closed contact; the normally open contact of the reset button FGAN has terminals No. 2 and No. 4; the normally closed contact of the reset button FGAN has 1 terminals No. 1 and No. 3; terminal No. 1 of the reset button FGAN, terminal No. 4 of the reset button FGAN, the second opening output terminal of the control handle KK, and the opening input terminal of the intermediate relay KKJ are all in line; the reset button FGAN The No. 2 terminal of the FGAN is electrically connected to the positive power supply +KM; the No. 3 terminal of the reset button FGAN is electrically connected to the opening input terminal of the circuit breaker operating circuit.