CN210245392U

CN210245392U - Novel GIS keeps apart ground connection cancellation self-sustaining return circuit

Info

Publication number: CN210245392U
Application number: CN201920588097.0U
Authority: CN
Inventors: Shuo Wang; 王烁; Na Qin; 秦娜
Original assignee: Shandong Dachi High Voltage Switchgear Co ltd
Current assignee: Shandong Dachi High Voltage Switchgear Co ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-04-03
Anticipated expiration: 2029-04-26

Abstract

The utility model relates to a novel GIS keeps apart ground connection cancellation self-sustaining return circuit belongs to SF₆The secondary control part of the auxiliary equipment of the gas insulated metal closed switch comprises an isolation grounding control loop and a motor loop, wherein the isolation grounding control loop comprises the following structures, the moving contact 23-24 of the relay KMD1, the moving contact 51-52 of the relay KMD2, the coil A1-A2 of the relay KMD1 and the moving contact 3-4 of the travel switch SLD2 are sequentially connected in series to form a first branch, the moving contact 23-24 of the relay KMD2, the moving contact 51-52 of the relay KMD1, the coil A1-A2 of the relay KMD2 and the moving contact 3-4 of the travel switch SLD1 are sequentially connected in series to form a second branch, and the first branch and the second branch are connected in parallel and then connected in seriesThe secondary series connection is connected with the break contact 38-40 of the travel switch DLE, the break contact 1-2 of the travel switch SL1, the break contact 1-2 of the travel switch SL2 and the break contact 21-24 of the motor micro-break auxiliary contact K31. The utility model discloses simple structure, stable performance are reliable, the operation of being convenient for.

Description

Novel GIS keeps apart ground connection cancellation self-sustaining return circuit

Technical Field

The utility model relates to a novel GIS keeps apart ground connection cancellation self-sustaining return circuit belongs to SF₆And part of secondary control of the gas insulated metal enclosed switch auxiliary equipment.

Background

At present, the isolation grounding control principle of the SF6 gas insulated metal enclosed switchgear with the voltage of 110kV or more is as follows: the circuit comprises an isolation grounding switch-off circuit, a switch-on circuit, a motor circuit and the like, and the various electric circuits are connected together through a cable to realize the operation of isolation grounding and the switch-on and switch-off operation of an isolation grounding mechanism. The control principle is simple, when the motor is power-off and the control circuit is still electrified on the electrical principle, and when the opening and closing handle is operated by mistake, the normally-open points of the relays in the motor circuit are all changed into normally-closed points, the motor DM is communicated with the positive and negative electrodes through the normally-closed contacts 13-14 of the relay KMD2, the normally-closed contacts 43-44 of the relay KMD2, the normally-open contacts 61-62 of the relay KMD1 and the current transformer DD, and misoperation can be performed after the motor DM is electrified, so that the safety and reliability of GIS maintenance cannot be met.

Disclosure of Invention

The utility model aims at providing an keep apart ground connection cancellation self-sustaining function return circuit of simple structure, stable performance are reliable, be convenient for operate.

The utility model discloses a realize through following technical scheme: a novel GIS isolation grounding cancellation self-holding loop comprises an isolation grounding control loop and a motor loop, and is characterized in that the isolation grounding control loop comprises the following structures, wherein the make contact 23-24 of a relay KMD1, the make contact 51-52 of a relay KMD2, the coil A1-A2 of the relay KMD1 and the make contact 3-4 of a travel switch SLD2 are sequentially connected in series to form a first branch, the make contact 23-24 of the relay KMD2, the make contact 51-52 of the relay KMD1, the coil A1-A2 of the relay KMD2 and the make contact 3-4 of the travel switch SLD1 are sequentially connected in series to form a second branch, the first branch and the second branch are connected in parallel with each other and then are sequentially connected in series to form the make contact 38-40 of the travel switch DLE, the break contact 1-2 of the travel switch SL1, the break contact 1-2 of the travel switch SL2 and the auxiliary contact 21-24 of the motor micro-K31, and then connected to the negative wiring.

Preferably, the isolation grounding control circuit is further provided with a switching-on and switching-off handle-SM 1, the 1,3-4 side of the switching-on and switching-off handle-SM 1 is connected between the dynamic contact 23-24 of the branch-circuit first relay KMD1 and the dynamic contact 51-52 of the relay KMD2, and the 1,3-2 side of the switching-on and switching-off handle-SM 1 is connected between the dynamic contact 23-24 of the branch-circuit second relay KMD2 and the dynamic contact 51-52 of the relay KMD 1.

Preferably, the motor circuit comprises a structure that the on-off contacts 13-14 of the relay KMD1, the on-off contacts 43-44 of the relay KMD2 and the on-off contacts 61-62 of the relay KMD1 are sequentially connected in series to form a branch circuit III, the on-off contacts 13-14 of the relay KMD2, the on-off contacts 43-44 of the relay KMD1 and the on-off contacts 61-62 of the relay KMD2 are sequentially connected in series to form a branch circuit IV, the fuse RD, the on-off contacts 71-72 of the relay KMD1, the on-off contacts 71-72 of the relay KMD2 and the on-off contacts 5-6 of the travel switch SLD2 are sequentially connected in series to form a branch circuit V, the on-off contacts 81-82 of the relay KMD1, the on-off contacts 81-82 of the KMD2 and the on-off contacts 1-2 of the travel switch SLD1 are connected in series to form a branch circuit VI, the current transformer is serially connected after the three-three and, then connected to the negative line;

the line starting end of the branch circuit five is connected between the dynamic contact points 13-14 of the relay KMD1 and the dynamic contact points 43-44 of the relay KMD2, and the line tail end is connected between the dynamic contact points 61-62 of the relay KMD1 and the current transformer DD; the starting end of a line of the branch six is connected between the movable contact points 13-14 of the relay KMD2 and the movable contact points 43-44 of the relay KMD1, and the tail end of the line is connected between the movable contact points 61-62 of the relay KMD2 and the current transformer DD; the starting end of a line of the motor DM is connected between the movable contact points 13-14 of the relay KMD1 and the movable contact points 43-44 of the relay KMD2, and the tail end of the line is connected between the movable contact points 13-14 of the relay KMD2 and the movable contact points 43-44 of the relay KMD 1; the starting end of a dynamic contact 5-6 of the travel switch SLD1 is connected between the dynamic contact 71-72 of the relay KMD2 and the dynamic contact 5-6 of the travel switch SLD2, and the tail end of the dynamic contact is connected with a negative circuit; the starting end of the break contact 1-2 of the travel switch SLD2 is connected between the break contact 81-82 of the relay KMD2 and the make contact 1-2 of the travel switch SLD1, and the tail end is connected with the negative circuit.

As the preferred scheme, the motor micro-breaking and micro-breaking auxiliary contacts are directly installed in the GIS control cubicle.

The beneficial effects of the utility model are that effectively prevented isolation ground connection under the electrified condition of motor circuit power loss, control circuit, behind the maloperation deciliter handle, the condition of mistake deciliter appears in the motor. When the motor is powered off, the control loop is also powered off, so that the condition is avoided, and the safe and stable operation of the equipment is further ensured.

Drawings

Fig. 1 is a control schematic diagram of the present invention.

In the figure, an SM1 opening and closing handle, KMD1, a KMD2 relay, SLD1, SLD2, SL1, SL2 and DLE travel switches, a DM motor, an RD fuse, a DD current transformer and a K31 motor are slightly disconnected.

Detailed Description

The following description of the present invention will be made with reference to the accompanying drawings.

As shown in FIG. 1, a novel GIS isolation grounding cancellation self-holding loop comprises an isolation grounding control loop and a motor loop, wherein the isolation grounding control loop comprises the following structures, an on contact 23-24 of a relay KMD1, an off contact 51-52 of a relay KMD2, a coil A1-A2 of the relay KMD1 and an on contact 3-4 of a travel switch SLD2 are sequentially connected in series to form a first branch, an on contact 23-24 of a relay KMD2, an off contact 51-52 of a relay KMD1, a coil A1-A2 of a relay KMD2 and an off contact 3-4 of a travel switch SLD1 are sequentially connected in series to form a second branch, the first branch and the second branch are connected in parallel and then are sequentially connected in series to form an off contact 38-40 of a travel switch DLE, an off contact 1-2 of a travel switch SL1, an off contact 1-2 of a travel switch SL2 and an auxiliary contact 21-24 of a motor micro-K31, and then connected to the negative wiring.

Preferably, the isolation grounding control circuit is further provided with a switching-closing handle-SM 1, a knife connecting branch I and a parallel point on a branch II of the switching-closing handle-SM 1, the 1,3-4 side of the switching-closing handle-SM 1 is connected between the movable contact 23-24 of the relay KMD1 of the branch I and the movable contact 51-52 of the relay KMD2, and the 1,3-2 side of the switching-closing handle-SM 1 is connected between the movable contact 23-24 of the relay KMD2 of the branch II and the movable contact 51-52 of the relay KMD 1.

Preferably, the motor circuit comprises a structure that the on-off contacts 13-14 of the relay KMD1, the on-off contacts 43-44 of the relay KMD2 and the on-off contacts 61-62 of the relay KMD1 are sequentially connected in series to form a branch circuit III, the on-off contacts 13-14 of the relay KMD2, the on-off contacts 43-44 of the relay KMD1 and the on-off contacts 61-62 of the relay KMD2 are sequentially connected in series to form a branch circuit IV, the fuse RD, the on-off contacts 71-72 of the relay KMD1, the on-off contacts 71-72 of the relay KMD2 and the on-off contacts 5-6 of the travel switch SLD2 are sequentially connected in series to form a branch circuit V, the on-off contacts 81-82 of the relay KMD1, the on-off contacts 81-82 of the relay KMD2 and the on-off contacts 1-2 of the travel switch SLD1 are connected in series to form a branch circuit VI, the branch circuit III and the branch circuit IV are, then connected to the negative line;

The working principle is as follows: in an isolated grounding control loop, a switching-on/off handle-SM 1 is manually operated, a coil A1-A2 of a relay KMD2 is electrified, self-holding is carried out by closing the switching-on contacts 23-24 of the relay KMD2, and meanwhile, the switching-on contacts 13-14 and 43-44 of a relay KMD2 in a motor loop are closed, so that a motor DM operates, and switching-on operation is completed; the switching-on and switching-off handle-SM 1 is manually operated, the travel switch SLD2 is pressed to be closed, the coil A1-A2 of the relay KMD1 is electrified, the switching-on contacts 21-23 of the relay KMD1 are closed to carry out self-holding, and the switching-on contacts 13-14 and 43-44 of the relay KMD1 in the motor circuit are closed at the same time, so that the motor DM operates to complete the switching-off operation.

When the motor is powered off, the state of the micro-break auxiliary contact of the motor is changed, the break contact 21-24 of the micro-break auxiliary contact K31 of the motor is broken, the negative electrode in the control circuit is broken at the moment, and the control circuit is powered off, namely, when the motor is powered off, the control circuit is powered off, and self-holding is cancelled, so that when an operator generates misoperation on/off a brake handle, the situation that misoperation, namely, mistaken switching-on/off, does not occur after the motor is powered on is ensured.

The motor micro-breaking and micro-breaking auxiliary contacts are directly installed in the GIS control cubicle.

The motor is disconnected a little and the auxiliary contact snap-on that cuts off a little on the guide rail in the collection accuse cabinet, passes through the effectual connection of wire with other electrical components and is in the same place, then links together through terminal row and the auxiliary contact that cuts off a little, and the effectual ground circuit that prevents keeps apart is under the circumstances that motor circuit loses electricity, control circuit are electrified, and maloperation divide-shut brake handle, causes the circumstances that the mistake divides and shut appears after the motor is electrified to ensure that equipment operation is safe and reliable more.

The technical features other than those described in the specification are known to those skilled in the art.

Claims

1. A novel GIS isolation grounding cancellation self-holding loop comprises an isolation grounding control loop and a motor loop, and is characterized in that the isolation grounding control loop comprises the following structures, wherein the make contact 23-24 of a relay KMD1, the make contact 51-52 of a relay KMD2, the coil A1-A2 of the relay KMD1 and the make contact 3-4 of a travel switch SLD2 are sequentially connected in series to form a first branch, the make contact 23-24 of the relay KMD2, the make contact 51-52 of the relay KMD1, the coil A1-A2 of the relay KMD2 and the make contact 3-4 of the travel switch SLD1 are sequentially connected in series to form a second branch, the first branch and the second branch are connected in parallel with each other and then are sequentially connected in series to form the make contact 38-40 of the travel switch DLE, the break contact 1-2 of the travel switch SL1, the break contact 1-2 of the travel switch SL2 and the auxiliary contact 21-24 of the motor micro-K31, and then connected to the negative wiring.

2. The novel GIS isolating grounding cancellation self-holding loop of claim 1, wherein the isolating grounding control loop is provided with a switching-on/off handle-SM 1, the 1,3-4 side of the switching-on/off handle-SM 1 is connected between the make contact 23-24 of the branch-in-one relay KMD1 and the break contact 51-52 of the relay KMD2, and the 1,3-2 side of the switching-on/off handle-SM 1 is connected between the make contact 23-24 of the branch-in-two relay KMD2 and the break contact 51-52 of the relay KMD 1.

3. The novel GIS isolating grounding cancellation self-holding loop as claimed in claim 1, wherein the motor loop comprises a structure that the make contact 13-14 of the relay KMD1, the make contact 43-44 of the relay KMD2 and the make contact 61-62 of the relay KMD1 are sequentially connected in series to form a third branch, the make contact 13-14 of the relay KMD2, the make contact 43-44 of the relay KMD1 and the make contact 61-62 of the relay KMD2 are sequentially connected in series to form a fourth branch, the fuse RD, the make contact 71-72 of the relay KMD1, the make contact 71-72 of the relay KMD2 and the make contact 5-6 of the travel switch SLD2 are sequentially connected in series to form a fifth branch, the make contact 81-82 of the relay KMD1, the make contact 81-82 of the relay KMD2 and the make contact 1-2 of the switch SLD1 are connected in series to form a sixth branch, the third branch and the fourth branch are connected in parallel and then connected in series with a current transformer DD and then connected to a negative electrode circuit;

4. The GIS isolating grounding cancellation self-holding loop as claimed in claim 1, wherein the motor micro-break and micro-break auxiliary contacts are directly installed in the GIS control cubicle.