CN106841876B - A kind of monitoring method of relay protection outlet pressing plate - Google Patents

Abstract

The invention relates to a monitoring method for a relay protection outlet pressure plate. The input voltage signal of the lower end connecting column of the protection tripping outlet pressure plate and the reclosing outlet pressure plate is obtained. When the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are input , output the input status information; when the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or virtual connection, no input voltage signal is output; the input state information of the relay protection outlet pressure plate is monitored through the input state information. Through the combination of cascading triodes and optocoupler relays, the same voltage conversion circuit can simultaneously realize the judgment of leakage input and virtual connection, which can not only judge the input conditions of the tripping outlet pressure plate and the reclosing outlet pressure plate of the protection device, but also can The judgment method of judging whether the pressure plate is virtual connection and solving the voltage difference cannot exclude the exception when both ends of the pressure plate at the outlet of the re-entry gate are both positive.

Description

A monitoring method for relay protection outlet pressure plate

technical field

The invention relates to a relay protection technology of a substation, and more particularly, to a monitoring method for an outlet pressure plate of a relay protection.

Background technique

In recent years, with the development of substation automation, the status of the functional pressure plate of the relay protection device can be sent to the monitoring center, but the monitoring of the status of the protection outlet pressure plate is lacking. The state of the protection outlet pressure plate directly affects whether the protection device can trip the circuit breaker to isolate the fault when the power grid fails.

Since there is no monitoring of the protection outlet pressure plate, there have also been cases of leakage of the outlet pressure plate during the inspection of the substation, or the expansion of the accident scope due to the leakage of the pressure plate and the virtual connection.

The monitoring of the pressure plate in the prior art is mainly realized by two methods:

One is to monitor the pressure plate by adding another auxiliary node at the position when the pressure plate is put in, or by taking images for comparison;

Second, monitoring is achieved by comparing the potentials on both sides of the exit node.

The disadvantages of the above method are:

Method 1: The judgment of the virtual connection of the pressure plate cannot be realized;

Method 2: When the switch is closed, if both sides of the recloser exit node are positively charged, the state of the recloser exit pressure plate cannot be monitored.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a monitoring method for the relay protection outlet pressure plate which can accurately monitor the state of the protection outlet pressure plate of input, leakage, and virtual connection.

The technical scheme of the present invention is as follows:

A monitoring method for a relay protection outlet pressure plate, obtaining the input voltage signal of the lower end connecting column of the protection tripping outlet pressure plate and the reclosing outlet pressure plate, and when the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are input, the output is input. Status information; when the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or virtual connection, there is no output input voltage signal; the input state of the relay protection outlet pressure plate is monitored through the input state information.

Preferably, the lower end connecting posts of the protection tripping outlet pressure plate and the reclosing outlet pressure plate are respectively connected to the voltage conversion circuit, and the voltage conversion circuit is provided with an optocoupler relay; The coupling relay is turned on, and then outputs the input status information; when the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or virtual connection, there is no output input voltage signal, the optocoupler relay is turned off, and the input fault signal is output.

Preferably, the voltage conversion loop includes a negative power conversion loop and a positive power conversion loop, and the on-off of the optocoupler relay is controlled by the on-off of the cascaded triodes.

Preferably, the negative power conversion circuit includes two cascaded NPN triodes, and the negative electrode of the input terminal of the optocoupler relay of the negative power conversion loop is connected to the collector of the NPN triode; the positive power conversion loop includes an NPN triode, and the photocoupler relay of the positive power conversion loop The negative pole of the input terminal is connected to the collector of the NPN triode.

Preferably, when the lower end connecting posts of the protection tripping outlet pressure plate and the reclosing outlet pressure plate are put into operation, negative electricity and positive electricity are respectively output.

Preferably, when the protection trip outlet pressure plate is put on, the negative power of the control power supply passes through the trip coil, the circuit breaker closing auxiliary node, the trip hold relay and the protection trip outlet pressure plate, so that the lower terminal of the protection trip outlet pressure plate is negatively charged.

Preferably, when the recloser outlet pressure plate is turned on, the positive power of the control power supply passes through the trip position relay, the closing hold relay and the recloser outlet pressure plate, so that the lower terminal of the recloser outlet pressure plate is positively electrified.

Preferably, when the optocoupler relay of the voltage conversion circuit is turned on, it outputs a turn-on voltage signal, and the turn-on voltage signal is judged by the main control module, the main control module outputs a driving voltage signal, and the driving voltage signal is connected to the optocoupler of the state output circuit The input terminal of the relay is positive, and the optocoupler relay outputs the status voltage signal; when the optocoupler relay of the voltage conversion circuit is turned off, there is no conduction voltage signal output, no driving voltage signal output, and the status output circuit outputs the input fault signal.

The beneficial effects of the present invention are as follows:

The monitoring method of the relay protection outlet pressure plate of the present invention is based on the input voltage signal of the lower end connecting column of the protection tripping outlet pressure plate and the reclosing outlet pressure plate, and the final output can correctly reflect the protection through the steps of collection, conversion and judgment. The signal of the state of the tripping outlet pressure plate and the reclosing outlet pressure plate. Through the combination of cascaded triodes and optocoupler relays, the same voltage conversion circuit can simultaneously realize the judgment of leakage input and virtual connection. Judging whether the pressure plate is virtual connection overcomes the need to use different technical means and principles to judge the leakage input and virtual connection in the prior art, and solves the problem that the judgment method of voltage difference cannot exclude the time when both ends of the pressure plate at the outlet of the re-entry gate are both positive electricity exceptions. Compared with the method of image comparison, the present invention does not observe the external appearance, but essentially identifies whether the input is successful, and the identification result is direct and accurate.

Description of drawings

1 is a schematic diagram of the present invention in order to realize remote monitoring;

Fig. 2 is the principle diagram of the negative electricity conversion circuit;

Figure 3 is a schematic diagram of a positive-to-electrical conversion circuit;

Figure 4 is a schematic diagram of acquiring input voltage information;

Figure 5 is a schematic diagram of a state output loop;

FIG. 6 is a schematic diagram of the monitoring device.

Detailed ways

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

In order to solve the problem of inability to accurately judge whether the virtual connection exists in the prior art, the present invention provides a monitoring method for the relay protection outlet pressure plate, which detects and judges whether the lower end connecting posts of the protection trip outlet pressure plate and the reclosing outlet pressure plate are live or not. , it can accurately detect the status of the protection tripping outlet pressure plate and the reclosing outlet pressure plate being in, missing, and virtual connection, and the judgment result can be sent to the remote monitoring center for online monitoring. As shown in Figure 1, connect the lower end terminal of the protection tripping outlet pressure plate and the reclosing outlet pressure plate in the operation circuit of the relay protection device to the monitoring device, after the monitoring device judges, the output signal is sent to the measurement and control device, and transmitted to the remote control device through the network cable. After the installation, the status of the protection tripping outlet pressure plate and the reclosing outlet pressure plate is sent to the monitoring center through the dispatching data network.

The monitoring method of the relay protection outlet pressure plate of the present invention takes the live condition of the lower end connecting columns of the protection tripping outlet pressure plate and the reclosing outlet pressure plate as the monitoring basis, and obtains the lower end connecting columns of the protection tripping outlet pressure plate and the reclosing outlet pressure plate as the monitoring basis. When the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are input, the input status information is output; when the input voltage signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or false When connected, there is no output input voltage signal. The input state of the relay protection outlet pressure plate is monitored through the input status information, that is, when the protection trip outlet pressure plate and the reclosing outlet pressure plate are input, the input state information reflects that the protection trip outlet pressure plate and the recloser outlet pressure plate are input; when the protection trip outlet pressure plate and the recloser outlet pressure plate are input; . When the reclosing outlet pressure plate is leakage input or virtual connection, there is no output input voltage signal, and the input fault signal reflects that the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or virtual connection.

In order to realize the judgment of leakage input and virtual connection, the present invention converts the input voltage signal of the lower end connecting column of the protection tripping outlet pressure plate and the reclosing outlet pressure plate through the voltage conversion circuit, and converts it into the input state information or input of the optocoupler relay output. The fault signal is used as the basis for judging the input state of the protection tripping outlet pressure plate and the reclosing outlet pressure plate. The lower end connecting posts of the protection tripping outlet pressure plate and the reclosing outlet pressure plate are respectively connected to the voltage conversion circuit, and the voltage conversion circuit is provided with an optocoupler relay; when the protection tripping outlet pressure plate and the reclosing outlet pressure plate are input, the input voltage signal is output, and the optocoupler relay conducts When the protection tripping outlet pressure plate and the reclosing outlet pressure plate are leakage input or virtual connection, there is no output input voltage signal, the optocoupler relay is turned off, and the input fault signal is output.

Since the lower end connecting column of the protection tripping outlet pressure plate and the reclosing outlet pressure plate may output positive or negative electricity, in order to apply to both cases, the voltage conversion circuit includes a negative electricity conversion circuit and a positive electricity conversion circuit. The on and off of the coupling relay. For those that output negative electricity when input, the lower end connecting column is connected to the negative electricity conversion circuit, and for those that output positive electricity when inputting, the lower end connecting column is connected to the positive electricity conversion circuit.

In this embodiment, when switched on, the lower end connecting column of the protection trip outlet pressure plate outputs negative electricity, therefore, the lower end connection column of the protection trip outlet pressure plate is connected to the negative electricity conversion circuit. As shown in FIG. 2 , the negative power conversion circuit includes two cascaded NPN triodes, and the negative electrode of the input terminal of the optocoupler relay OP1 of the negative power conversion loop is connected to the collector of the NPN triode. The base of the second-stage NPN transistor Q2 is connected to the lower end connecting column of the protection tripping outlet pressure plate, the emitter of the transistor Q2 is grounded, and the peripheral circuit is connected in parallel between the base and the emitter, including parallel resistors, diodes, capacitors, and the collector is connected + 12V voltage. The base of the first-stage NPN transistor Q1 is connected to the collector of the transistor Q2, the collector of the transistor Q1 is connected to the negative pole of the input terminal of the optocoupler relay OP1, and the emitter is grounded. The positive pole of the input terminal of the optocoupler relay OP1 is connected to the +12V voltage, the positive pole of the output terminal of the optocoupler relay OP1 is connected to the +24V voltage, and the negative pole of the output terminal is connected to the main control module. When the protection tripping outlet pressure plate is put into operation, the input terminal of the monitoring device is negatively charged, the transistor Q2 is turned off, the transistor Q1 is turned on, the optocoupler relay OP1 is turned on, and the main control module is turned on to positive electricity. When the protection tripping outlet pressure plate is connected or leaked, the input end of the monitoring device is out of power, the transistor Q2 is turned on, and the transistor Q1 is turned off, the optocoupler relay OP1 cannot be turned on, and the main control module has no input.

When put into operation, the lower end connecting column of the recloser outlet pressure plate outputs positive electricity, therefore, the lower end connecting column of the reclosing outlet pressure plate is connected to the positive electricity conversion circuit. As shown in FIG. 3 , the positive power conversion circuit includes an NPN triode, and the negative electrode of the input terminal of the optocoupler relay OP2 of the positive power conversion loop is connected to the collector of the NPN triode. The base of the NPN transistor Q3 is connected to the lower end connecting column of the reclosing outlet pressure plate, the emitter of the transistor Q3 is grounded, and the peripheral circuit is connected in parallel between the base and the emitter, including parallel resistors, diodes, capacitors, collectors and optocoupler relays OP2 The negative side of the input terminal is connected. The positive pole of the input terminal of the optocoupler relay OP2 is connected to the +12V voltage, the positive pole of the output terminal of the optocoupler relay OP2 is connected to the +24V voltage, and the negative pole of the output terminal is connected to the main control module. When the recloser outlet pressure plate is put into operation, the input terminal of the monitoring device is positive, the transistor Q3 is turned on, the optocoupler relay OP2 is turned on, and the main control module is turned on to be positive. When the reclosing outlet pressure plate is connected or leaked, the input end of the monitoring device is out of power, the transistor Q3 is turned off, the optocoupler relay OP2 cannot be turned on, and the main control module has no input.

In this embodiment, when the lower end connecting posts of the protection tripping outlet pressure plate and the reclosing outlet pressure plate are put into operation, they output negative electricity and positive electricity respectively. Corresponding to the circuit structure, when the protection and tripping outlet pressure plate is put into operation, the negative electricity of the control power supply passes through the trip coil and opens the circuit. Auxiliary node, trip holding relay and protection trip outlet pressure plate, so that the lower terminal of the protection trip outlet pressure plate is negatively charged. When the recloser outlet pressure plate is put on, the positive power of the control power supply passes through the trip position relay, the closing hold relay and the recloser outlet pressure plate, so that the lower terminal of the recloser outlet pressure plate is positively charged.

As shown in Figure 4, the following two circuits are connected in parallel between the positive pole KM+ and the negative pole KM- of the control power supply:

1. Trip coil TQ, circuit breaker closing auxiliary node DL2, trip hold relay TBJ and protection trip outlet pressure plate 1CLP1, trip hold relay TBJ and protection trip outlet pressure plate 1CLP1 are connected in parallel on both sides with series red light HD and closing position relay HWJ;

2. The series-connected closing coil HQ, the circuit breaker closing auxiliary node DL1, the closing holding relay HBJ and the reclosing outlet pressure plate 1CLP2, the closing holding relay HBJ and the reclosing outlet pressure plate 1CLP2 are connected in parallel with a series green light LD and tripping on both sides. Position relay TWJ.

Wherein, the monitoring device is respectively connected to the connecting posts on the left side of the protection tripping outlet pressure plate 1CLP1 and the reclosing outlet pressure plate 1CLP2, and obtains the input voltage signal of the lower end connecting columns of the protection tripping outlet pressure plate and the reclosing outlet pressure plate. If the protection tripping outlet pressure plate 1CLP1 and the reclosing outlet pressure plate 1CLP2 are connected or leaked, the lower terminals of the protection tripping outlet pressure plate 1CLP1 and the reclosing outlet pressure plate 1CLP2 are not powered, that is, no input voltage signal is output. Therefore, the monitoring device judges whether the protection device pressure plate is put into operation by using the protection tripping outlet pressure plate 1CLP1 and the lower end terminal of the reclosing outlet pressure plate 1CLP2 as negative or positive electricity.

In the monitoring device, the judgment is made by the main control module. When the optocoupler relay of the voltage conversion circuit is turned on, the on-voltage signal is output. The on-voltage signal is judged by the main control module, and the main control module outputs the driving voltage signal, as shown in Figure 5. As shown, the driving voltage signal is connected to the positive pole of the input terminal of the optocoupler relay OP3 of the status output circuit, and the optocoupler relay OP3 outputs the status voltage signal. When the optocoupler relay OP3 of the voltage conversion circuit is turned off, no conduction voltage signal is output, no driving voltage signal is output, and the state output circuit outputs the input fault signal.

To sum up, the monitoring device of the present embodiment is shown in FIG. 6 , with the main control module as the judgment core and implemented based on the single-chip microcomputer. The electric conversion circuit is respectively provided with the protection tripping outlet pressure plate monitoring input terminal and the reclosing outlet pressure plate monitoring input terminal, and the status output circuit is provided with a status output terminal and a common terminal. The monitoring device is also provided with a power input terminal and a power module. During implementation, connect the lower end terminal of the tripping outlet pressure plate of the protection device or the reclosing outlet pressure plate to the monitoring device, and pass the negative power conversion module or the positive power conversion module to the main control module. Its open function is sent to the monitoring and control device through the status output circuit.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as it is in accordance with the technical essence of the present invention, changes, modifications, etc. to the above-described embodiments will fall within the scope of the claims of the present invention.

Claims (5)

1. a kind of monitoring method of relay protection outlet pressing plate, which is characterized in that obtain trip protection output clamping, reclosing goes out The investment voltage signal of the lower end connecting column of mouth pressing plate, when investment voltage signal reflection trip protection output clamping, reclosing go out When mouth pressing plate is investment, output investment status information；When investment voltage signal reflection trip protection output clamping, reclosing outlet When pressing plate is leakage investment or virtual connection, no output puts into voltage signal；Relay protection outlet pressing plate is monitored by investment status information Investment state；

Trip protection output clamping, reclosing output clamping lower end connecting column be separately connected voltage translation circuit, voltage conversion Light coupling relay is arranged in circuit；When trip protection output clamping, reclosing output clamping are investment, output investment voltage letter Number, light coupling relay conducting, and then export investment status information；When trip protection output clamping, reclosing output clamping are leakage When investment or virtual connection, no output puts into voltage signal, light coupling relay cut-off, output investment fault-signal；

Voltage translation circuit includes negative electricity conversing circuits, positive electricity conversing circuits, controls optocoupler by the on-off of cascade triode The conducting and cut-off of relay；Negative electricity conversing circuits include two cascade NPN triodes, the optocoupler relay of negative electricity conversing circuits The collector of the input cathode connection NPN triode of device；Positive electricity conversing circuits include a NPN triode, and positive electricity converts back The collector of the input cathode connection NPN triode of the light coupling relay on road.

2. the monitoring method of relay protection outlet pressing plate according to claim 1, which is characterized in that trip protection outlet pressure Plate, reclosing output clamping lower end connecting column investment when, respectively export negative electricity, positive electricity.

3. the monitoring method of relay protection outlet pressing plate according to claim 2, which is characterized in that trip protection outlet pressure When plate is investment, control power supply negative electricity is jumped by breaking coil, breaker coincidence auxiliary node, tripping guard relay and protection Lock output clamping makes the lower end binding post negative electricity of trip protection output clamping.

4. the monitoring method of relay protection outlet pressing plate according to claim 2, which is characterized in that reclosing output clamping When to put into, control power supply positive electricity makes to be overlapped by tripping position relay, combined floodgate guard relay and reclosing output clamping The lower end binding post of lock output clamping is positive electricity.

5. the monitoring method of relay protection outlet pressing plate according to claim 1, which is characterized in that work as voltage translation circuit Light coupling relay conducting when, export conducting voltage signal, conducting voltage signal judges through main control module, and main control module output is driven Dynamic voltage signal, drive voltage signal are connected to the input anode of the light coupling relay in state output circuit, light coupling relay Output state voltage signal；When the cut-off of the light coupling relay of voltage translation circuit, no conducting voltage signal output, no driving electricity Press signal output, state output circuit output investment fault-signal.