Medium-voltage switch cabinet switching loop monitoring device

Abstract

The utility model relates to a medium-voltage switch cabinet switching loop monitoring device, each medium-voltage switch cabinet comprises a first control loop and a second control loop, the first control loop comprises a Hall current transformer, a trigger, a comprehensive measurement and control device and a field effect transistor MOS, the output end of each Hall current transformer is connected with the input end of the trigger, and the output end of each Hall current transformer is connected with the input end of the trigger. The output end of the trigger is connected with the grid electrode of the field effect transistor MOS, the drain electrode and the source electrode of the field effect transistor MOS are respectively connected with the comprehensive measurement and control device through ports, the drain electrode of the field effect transistor MOS is connected with the cathode of the voltage stabilizing diode, and the source electrode of the field effect transistor MOS is connected with the anode of the voltage stabilizing diode. The utility model has the advantages that the on-site opening, the remote control opening and the protection opening are monitored, and the Hall current transformer, the trigger SN and the comprehensive measurement and control device are used for clearly recording which switching loop is switched on to cause tripping when a tripping fault occurs in the normal on-load operation process of the medium-voltage switch, so that a basis is provided for the analysis of the tripping accident.

Description

Technical Field

[0001] The utility model relates to a switch cabinet protection device, in particular to a medium-voltage switch cabinet switching circuit monitoring device. Background Art

[0002] The medium-voltage switchgear trip circuit is generally divided into remote control trip, local trip, protection trip, and medium-voltage switch mechanical trip. Except for the medium-voltage switch mechanical trip, other trip modes use their own trip circuits to trip the trip coil TQ with power through the auxiliary contacts of the medium-voltage switch of the protection device. In the daily operation and maintenance of medium-voltage switchgear equipment, it is difficult to analyze and find the cause of the medium-voltage switch tripping fault due to the lack of effective means to monitor the circuit status, especially the cause of the tripping caused by the trip circuit is difficult to confirm. Therefore, equipment operation and maintenance personnel urgently need a stable and reliable circuit monitoring device to record the circuit status and action information. Summary of the invention

[0003] The utility model aims to provide a medium-voltage switch cabinet switching circuit monitoring device. When a medium-voltage switch has a tripping fault during normal load operation, it records which switching circuit is connected and the tripping occurs, providing a basis for analyzing the medium-voltage switch tripping accident.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A medium-voltage switch cabinet switching circuit monitoring device includes a plurality of medium-voltage switch cabinets, each of which includes a control circuit 1 and a control circuit 2. The control circuit 1 includes a Hall current transformer, a trigger, an integrated measurement and control device, and a field effect transistor (MOS). The number of the Hall current transformers is five, and the number of the field effect transistor (MOS) is three. The output end of each Hall current transformer is connected to the input end of the trigger, the output end of the trigger is connected to the gate of the field effect transistor (MOS), the drain and source of the field effect transistor (MOS) are respectively connected to the integrated measurement and control device through ports, the drain of the field effect transistor (MOS) is connected to the cathode of a voltage-stabilizing diode, the source of the field effect transistor (MOS) is connected to the anode of the voltage-stabilizing diode, and the control circuit 1 is connected to the control circuit 2.

[0006] The Hall current transformer includes Hall current transformers 1 to 5, the control circuit 2 includes a conversion switch 1, a protection closing branch, a protection opening branch, a remote control branch, a local branch, and an opening coil branch, the protection closing branch, the protection opening branch, the remote control branch, the local branch, and the opening coil branch are connected to the line comprehensive protection device through a port, and the control circuit 2 is provided with a Hall current transformer;

[0007] The other end of the normally open contact 1 of the transfer switch 1 is connected to the input end of the remote control branch, the other end of the normally open contact 2 of the transfer switch 1 is connected to the input end of the local branch, and one end of the normally open contact 1 of the transfer switch 1 and one end of the normally open contact 2 of the transfer switch 1 are both connected to the positive pole of the DC power supply through the Hall current transformer 1 and the five-protection switch.

[0008] The local branch includes a second transfer switch, the other end of the normally open contact 2 of the second transfer switch is connected to the local closing port of the line comprehensive protection device, the other end of the normally open contact 1 of the second transfer switch is connected to the local opening port of the line comprehensive protection device through a second Hall current transformer, and the input end of the local branch is connected to one end of the normally open contact 1 of the second transfer switch and one end of the normally open contact 2 of the second transfer switch.

[0009] The remote control branch includes a tripping pressure plate three and a Hall current transformer three. The other end of the tripping pressure plate three is connected to the local opening port of the line comprehensive protection device through the remote control opening port of the line comprehensive protection device and the Hall current transformer three. The other end of the tripping pressure plate three is also connected to the local closing port of the line comprehensive protection device through the remote control closing port of the line comprehensive protection device. The input end of the remote control branch is connected to one end of the tripping pressure plate three.

[0010] The protection tripping branch includes a tripping pressure plate 1 and a Hall current transformer 4. One end of the tripping pressure plate 1 is connected to the protection tripping port 1 of the line comprehensive protection device, and one end of the tripping pressure plate 1 is connected to the protection tripping port 2 of the line comprehensive protection device through the Hall current transformer 4.

[0011] The protection tripping branch includes a tripping coil of a medium voltage switch and a Hall current transformer five. One end of the tripping coil of the medium voltage switch is connected to the tripping coil port of the line comprehensive protection device, and the other end of the tripping coil of the medium voltage switch is connected to the negative pole of the DC power supply through the Hall current transformer five.

[0012] The protection closing branch includes a closing coil of a medium voltage switch, one end of the closing coil of the medium voltage switch is connected to the closing coil port of the line comprehensive protection device, and the other end of the closing coil of the medium voltage switch is connected to the negative pole of the DC power supply.

[0013] The five-protection switch is the normally open contact of the five-protection coding lock.

[0014] The trigger model is SN74L511N.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. Monitor the medium voltage switch cutting circuit, i.e. local tripping, remote control tripping and protection tripping. When the medium voltage switch is in normal load operation, a tripping fault occurs. The Hall current transformer, trigger SN and integrated measurement and control device are used to record which cutting circuit is conducting and the tripping occurs, providing a basis for the analysis of the medium voltage switch tripping accident.

[0017] 2. Simple structure, easy operation, time-saving and labor-saving maintenance, and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the principle diagram of the monitoring device for the opening circuit of the medium voltage switch cabinet Figure 1 .

[0019] Figure 2 This is the principle diagram of the monitoring device for the opening circuit of the medium voltage switch cabinet Figure 2 .

[0020] Figure 3 This is the terminal wiring diagram of the line comprehensive protection device. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0022] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0023] [Example 1]

[0024] See Figure 1 to Figure 3A medium voltage switch cabinet switching circuit monitoring device includes a plurality of medium voltage switch cabinets, each of which includes a control circuit 1 and a control circuit 2. The control circuit 1 includes Hall current transformers CT1-CT5, a trigger SN, a comprehensive measurement and control device, a field effect transistor MOS1, a field effect transistor MOS2, and a field effect transistor MOS3. The power supply VCC is used to provide working power to the Hall current transformers CT1-CT5. The output end of the Hall current transformer CT1 is connected to the input ends A1, A2, and A3 of the trigger SN. The output end of the Hall current transformer CT5 is connected to the input ends C1, C2, and C3 of the trigger SN. The output end of the Hall current transformer CT2 is connected to the input end B1 of the trigger SN. The output end of the Hall current transformer CT3 is connected to the input end B2 of the trigger SN. The output end of the current transformer CT4 is connected to the input end B3 of the trigger SN, the output end Y1 of the trigger SN is connected to the gate of the field effect tube MOS1, the output end Y2 of the trigger SN is connected to the gate of the field effect tube MOS2, the output end Y3 of the trigger SN is connected to the gate of the field effect tube MOS3, the drain and source of the field effect tubes MOS1~MOS3 are respectively connected to the integrated measurement and control device through ports, the drain of each field effect tube MOS is connected to the cathode of the Zener diode, and the source of each field effect tube MOS is connected to the anode of the Zener diode. The Zener diode is used to prevent high voltage from being connected in series with the integrated measurement and control device. The integrated measurement and control device adopts "an integrated measurement and control device" with publication number CN212366438U, and other models can also be used. The trigger SN model is SN74L511N. The Hall current transformer includes Hall current transformers CT1 to CT5, and the control circuit 2 includes a conversion switch QK, a protection closing branch, a protection opening branch, a remote control branch, a local branch, and a closing coil TQ branch. The protection closing branch, the protection opening branch, the remote control branch, the local branch, and the closing coil TQ branch are connected to the line comprehensive protection device through a port, and the model of the line comprehensive protection device is PSL641U; the other end of the normally open contact one of the conversion switch QK is connected to the input end of the remote control branch, and the other end of the normally open contact two of the conversion switch QK is connected to the input end of the local branch. One end of the normally open contact one of the conversion switch QK and one end of the normally open contact two of the conversion switch QK are both connected to the positive pole +KM of the DC power supply through the Hall current transformer CT1 and the five-protection switch.

[0025] The local branch includes a transfer switch KK, the other end of the normally open contact 2 of the transfer switch KK is connected to the local closing port 6X13 of the line comprehensive protection device 1n, the other end of the normally open contact 1 of the transfer switch KK is connected to the local opening port 6X10 of the line comprehensive protection device 1n through the Hall current transformer CT2, and the input end of the local branch is connected to one end of the normally open contact 1 of the transfer switch KK and one end of the normally open contact 2 of the transfer switch KK; the remote control branch includes a tripping pressure plate 1L P3 and Hall current transformer CT3, the other end of the tripping pressure plate 1LP3 is connected to the local tripping port 6X10 of the line comprehensive protection device 1n through the remote control opening port 5X1, 5X2 and Hall current transformer CT3 of the line comprehensive protection device 1n, and the other end of the tripping pressure plate 1LP3 is also connected to the local closing port 6X13 of the line comprehensive protection device 1n through the remote control closing port 5X3, 5X4 of the line comprehensive protection device 1n. The input end of the remote control branch is connected to the tripping pressure plate 1L The protection opening branch includes a tripping pressure plate 1LP1 and a Hall current transformer CT4, one end of the tripping pressure plate 1LP1 is connected to the protection opening port 6X7 of the line comprehensive protection device 1n, and one end of the tripping pressure plate 1LP1 is connected to the protection opening port 6X11 of the line comprehensive protection device 1n through the Hall current transformer CT4; the protection opening branch includes the opening coil TQ of the medium voltage switch and the Hall current transformer CT5, and the opening coil TQ of the medium voltage switch One end is connected to the opening coil TQ port 6X9, 6X12 of the line comprehensive protection device 1n, and the other end of the opening coil TQ of the medium voltage switch is connected to the negative pole -KM of the DC power supply through the Hall current transformer CT5; the protection closing branch includes the closing coil HQ of the medium voltage switch, one end of the closing coil HQ of the medium voltage switch is connected to the closing coil HQ port 6X15 of the line comprehensive protection device 1n, and the other end of the closing coil HQ of the medium voltage switch is connected to the negative pole -KM of the DC power supply. The five-protection switch is the normally open contact of the five-protection coding lock.

[0026] Working process:

[0027] The current signal in the switch-off circuit is converted into a 0-10V signal through the Hall current sensors CT1~CT5; when the Hall current sensors CT1, CT2, and CT5 simultaneously sense the DC current and output a 0-10V signal, which is transmitted to the AND gate trigger SN pins A1, B1, and C1, the output pin Y1 is high level, and the source and drain of the high-voltage field effect transistor MOS1 are turned on; when the Hall current sensors CT1, CT2, and CT5 do not sense the DC current at the same time, the AND gate trigger SN judges that the circuit condition is not met, and the source and drain of the high-voltage field effect transistor MOS1 are turned on. Shut down, define the on-state of the high-voltage field effect tube MOS1 as "on-site switch-off" in the background of the integrated measurement and control device; similarly, as shown in the figure, the Hall current sensors CT1, CT3, and CT5 correspond to the AND gate trigger SN pins A2, B2, and C2, and the output pin Y2, and the on-state of the field effect tube MOS2 is defined as "remote control switch-off" in the background of the integrated measurement and control device; as shown in the figure, the Hall current sensors CT1, CT4, and CT5 correspond to the AND gate trigger SN pins A3, B3, and C3, and the output pin Y3, and the on-state of the field effect tube MOS3 is defined as "protection tripping" in the background of the integrated measurement and control device;

[0028] Through the above judgment, the cause of the medium voltage switch tripping can be identified.

[0029] The utility model includes a medium voltage switch cutting circuit, namely, local opening, remote control opening, and protection opening for monitoring. When the medium voltage switch is in normal load operation, a tripping fault occurs. Through the Hall current transformer, the trigger SN, and the comprehensive measurement and control device, it is clearly recorded which cutting circuit is turned on and the tripping occurs, providing a basis for the analysis of the medium voltage switch tripping accident. The utility model has a simple structure, is easy to operate, saves time and effort in maintenance, and is easy to promote.

Claims

1. A medium voltage switch cabinet switching circuit monitoring device, comprising a plurality of medium voltage switch cabinets, characterized in that: Each medium-voltage switch cabinet includes control loop one and control loop two. Control loop one includes a Hall current transformer, a trigger, an integrated measurement and control device, and a field effect transistor MOS. There are five Hall current transformers and three field effect transistors MOS. The output end of each Hall current transformer is connected to the input end of the trigger, the output end of the trigger is connected to the gate of the field effect transistor MOS, the drain and source of the field effect transistor MOS are respectively connected to the integrated measurement and control device through ports, the drain of the field effect transistor MOS is connected to the cathode of the voltage-stabilizing diode, the source of the field effect transistor MOS is connected to the anode of the voltage-stabilizing diode, and control loop one is connected to control loop two.

2. A medium voltage switch cabinet circuit breaker monitoring device according to claim 1, characterized in that: The Hall current transformer includes Hall current transformers 1 to 5, the control loop 2 includes a conversion switch 1, a protection closing branch, a protection opening branch, a remote control branch, a local branch, and an opening coil branch, the protection closing branch, the protection opening branch, the remote control branch, the local branch, and the opening coil branch are connected to the line comprehensive protection device through a port, and the control loop 2 is provided with a Hall current transformer; The other end of the normally open contact 1 of the transfer switch 1 is connected to the input end of the remote control branch, the other end of the normally open contact 2 of the transfer switch 1 is connected to the input end of the local branch, and one end of the normally open contact 1 of the transfer switch 1 and one end of the normally open contact 2 of the transfer switch 1 are both connected to the positive pole of the DC power supply through the Hall current transformer 1 and the five-protection switch.

3. A medium voltage switch cabinet circuit breaker monitoring device according to claim 2, characterized in that: The local branch includes a second conversion switch, the other end of the normally open contact 2 of the second conversion switch is connected to the local closing port of the line comprehensive protection device, the other end of the normally open contact 1 of the second conversion switch is connected to the local opening port of the line comprehensive protection device through a second Hall current transformer, and the input end of the local branch is connected to one end of the normally open contact 1 of the second conversion switch and one end of the normally open contact 2 of the second conversion switch.

4. A medium voltage switch cabinet circuit breaker monitoring device according to claim 2, characterized in that: The remote control branch includes a tripping pressure plate three and a Hall current transformer three. The other end of the tripping pressure plate three is connected to the local opening port of the line comprehensive protection device through the remote control opening port of the line comprehensive protection device and the Hall current transformer three. The other end of the tripping pressure plate three is also connected to the local closing port of the line comprehensive protection device through the remote control closing port of the line comprehensive protection device. The input end of the remote control branch is connected to one end of the tripping pressure plate three.

5. A medium voltage switch cabinet switching circuit monitoring device according to claim 2, characterized in that: The protection tripping branch includes a tripping pressure plate 1 and a Hall current transformer 4. One end of the tripping pressure plate 1 is connected to the protection tripping port 1 of the line comprehensive protection device, and one end of the tripping pressure plate 1 is connected to the protection tripping port 2 of the line comprehensive protection device through the Hall current transformer 4.

6. A medium voltage switch cabinet switching circuit monitoring device according to claim 2, characterized in that: The protection tripping branch includes a tripping coil of a medium voltage switch and a Hall current transformer five. One end of the tripping coil of the medium voltage switch is connected to the tripping coil port of the line comprehensive protection device, and the other end of the tripping coil of the medium voltage switch is connected to the negative pole of the DC power supply through the Hall current transformer five.

7. A medium voltage switch cabinet circuit breaker monitoring device according to claim 2, characterized in that: The protection closing branch includes a closing coil of a medium voltage switch, one end of the closing coil of the medium voltage switch is connected to the closing coil port of the line comprehensive protection device, and the other end of the closing coil of the medium voltage switch is connected to the negative pole of the DC power supply.

8. A medium voltage switch cabinet circuit breaker monitoring device according to claim 2, characterized in that: The five-protection switch is a normally open contact of the five-protection coding lock.

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