CN213400928U - Control loop for preventing switching-off with load of GG1A high-voltage board - Google Patents
Control loop for preventing switching-off with load of GG1A high-voltage board Download PDFInfo
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- CN213400928U CN213400928U CN202021328235.0U CN202021328235U CN213400928U CN 213400928 U CN213400928 U CN 213400928U CN 202021328235 U CN202021328235 U CN 202021328235U CN 213400928 U CN213400928 U CN 213400928U
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Abstract
本实用新型涉及用电保护设备，具体为一种GG1A高压柜防止带负荷拉闸的控制回路，包括有控制回路Ⅰ、控制回路Ⅱ和控制回路Ⅲ，控制回路Ⅰ连接在供电线路与微机保护测控装置的跳闸保护端子之间，控制回路Ⅱ连接在站内合闸回路的就地允许上，控制回路Ⅲ连接在站内合闸回路的远方允许上，控制回路Ⅲ与重动继电器并联，本实用新型通过控制回路的改进解决高压柜带负荷拉闸的问题，防止带负荷分、合隔离开关，当断路器处于合闸状态时，隔离开关不能进行分、合操作，只有当断路器处于分闸状态时，隔离开关方可进行分、合闸操作，解决由于常年使用，高压柜内的五防连锁措施不完备，给现场人员和安全生产代理隐患的问题，提高压柜内使用安全性。
The utility model relates to electrical protection equipment, in particular to a control circuit for preventing a GG1A high-voltage cabinet from being pulled under load, comprising a control circuit I, a control circuit II and a control circuit III. Between the trip protection terminals of the device, the control circuit II is connected to the local permission of the closing circuit in the station, the control circuit III is connected to the remote permission of the closing circuit in the station, and the control circuit III is connected in parallel with the re-action relay. The improvement of the control circuit solves the problem of the high-voltage cabinet with load opening, and prevents the disconnector switch with load from opening and closing. When the circuit breaker is in the closing state, the disconnecting switch cannot perform opening and closing operations, only when the circuit breaker is in the opening state. , the isolating switch can perform opening and closing operations, solve the problem that the five-proof interlocking measures in the high-voltage cabinet are incomplete due to year-round use, and cause hidden dangers to on-site personnel and safety production agents, and improve the safety of use in the pressure cabinet.
Description
Technical Field
The utility model relates to a power consumption protective equipment specifically is a GG1A high-voltage board prevents control circuit of on-load brake-off.
Background
The five-prevention interlocking in the high-voltage cabinet is a basic power utilization protection measure for ensuring the working safety of operators on duty in the power distribution room. The service life of the GG1A high-voltage cabinet in some old stations of a 10KV power distribution room is basically more than 20-30 years, five-prevention measures are incomplete, and great potential safety hazards are brought to field personnel and production. Because the GG1A high-voltage board is connected with the horizontal bus and the high-voltage vacuum circuit breaker through the isolation knife switch, once the isolation switch is pulled and closed with load, strong electric arcs can be generated, arc short circuit can be caused, and operators and equipment can be burned, therefore, it is very important to prevent the isolation switch in the GG1A high-voltage board from being pulled and closed with load.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a GG1A high-voltage board prevents the control circuit of on-load brake-off, prevents that the on-load from dividing, closing isolator, when the circuit breaker is in the combined floodgate state promptly, isolator can not divide, close the operation, only when the circuit breaker is in the state of separating the floodgate, isolator can divide, close the floodgate operation.
For solving the problem, the utility model relates to a GG1A high-voltage board prevents control circuit of on-load switching-off, including control circuit I, control circuit II and control circuit III, control circuit I is connected between power supply line and microcomputer protection measurement and control device's tripping operation protection terminal, and control circuit II is connected in the station on the allowwing of closing a floodgate return circuit on the spot, and control circuit III is connected in the station on the allowwing of closing a floodgate return circuit's distant place, and control circuit III is parallelly connected with the heavy dynamic relay.
Furthermore, the control loop I is provided with an isolation closing point and a connecting sheet, the isolation closing point and the connecting sheet are connected in series, and the isolation closing point and the connecting sheet are connected in series between a power supply line and a trip protection terminal of the microcomputer protection measurement and control device.
The linkage of a disconnecting switch and a circuit breaker is realized through a mechanical structure by frequently adopting a mode of additionally arranging an electromagnetic lock in the GG1A high-voltage cabinet, the electromagnetic lock locks an operating connecting rod of the disconnecting switch to be incapable of performing on-off operation as long as the circuit breaker is switched on, but the electromagnetic lock is frequently in the field to have mechanical fault, and at the moment, the function fails to bring very serious potential safety hazard. In order to reduce hidden danger and avoid the failure of the five-prevention function when the electromagnetic lock is in failure, the transformation of an electric loop is considered. A secondary loop is transformed by connecting an isolation closing point to the front end of a tripping protection terminal of the microcomputer protection measurement and control device, when equipment normally operates, namely, the equipment is in a loaded operation state, the isolation switch normally closing point is opened, and the protection terminal of the microcomputer protection measurement and control device does not act; once the isolating switch is pulled open with load, the normally closed point of the isolating switch is closed, and a protection tripping circuit of a protection terminal of the microcomputer protection measurement and control device is connected, so that the circuit breaker is immediately tripped, and the arc light is effectively avoided.
Furthermore, the control loop II is connected to the front end of a closing terminal of the microcomputer protection measurement and control device, an isolating switch normally-on point and an isolating switch normally-off point are arranged on the control loop II, and the isolating switch normally-on point and the isolating switch normally-off point are connected in parallel.
When the operation and maintenance personnel are used for overhauling or testing, the disconnecting switch is required to be pulled away from the upper horizontal bus, namely the circuit breaker is required to be normally switched on and switched off under the disconnecting condition of the disconnecting switch. Connecting the normally-open point and normally-closed point of the isolating switch in parallel and then connecting the normally-open point and the normally-closed point of the isolating switch in series on a switching-on loop in the station; when the equipment normally runs, the normally-open point of the isolating switch is closed, the normally-closed point of the isolating switch is opened, and the closing loop is normal; when the isolating switch is pulled open in an overhaul test, the normally open point of the isolating switch is opened, the normally closed point of the isolating switch is closed, the normally closed point of the isolating switch is in short circuit with all external associated condition contacts, and the breaker can be normally switched on in the overhaul test. If the auxiliary point of the isolating switch is not enough, the local position contact of the remote/local change-over switch in the mining cabinet is connected in parallel with the closing loop, and the function that the breaker can be normally opened and closed no matter in a maintenance test or a normal operation state is realized.
Furthermore, a forced permission change-over switch is arranged on the control circuit III, and a switch point of the forced permission change-over switch is bridged between the first terminal and the second terminal of the reset relay.
According to the technical scheme, a remote closing permission signal is sent by a reset relay through a background of a microcomputer protection measurement and control device in a GG1A high-voltage cabinet, when the background loses power, the permission signal cannot be connected, so that remote closing cannot be realized, a forced permission change-over switch is additionally arranged, a change-over switch point is bridged between a first terminal and a second terminal of the reset relay, when the background loses power, the reset relay fails, the forced permission of the forced permission change-over switch can be realized, and the closing operation of a remote PLC and a field operation box is realized.
The utility model has the advantages that: the utility model solves the problem of GG1A high-voltage cabinet with load pull-off, prevents load switch-off and switch-on isolation switch through the improvement of the control loop, when the circuit breaker is in a closing state, the isolating switch can not perform opening and closing operations, and only when the circuit breaker is in the opening state, the isolating switch can perform opening and closing operations, so that the problem that due to perennial use, five-prevention interlocking measures in a high-voltage cabinet are incomplete, hidden dangers are caused to field personnel and safety production agents is solved, and the use safety in the voltage cabinet is improved.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a circuit diagram of a control loop I part of the present invention;
FIG. 3 is a circuit diagram of a control circuit II of the present invention;
fig. 4 is a circuit diagram of the third part of the control circuit of the present invention.
In the figure: 1. a control loop I; 2. a control loop II; 3. and a control loop III.
Detailed Description
As shown in figure 1, the utility model relates to a GG1A high-voltage board prevents control circuit of on-load switching-off, including control circuit I, control circuit II and control circuit III, control circuit I is connected between power supply line and microcomputer protection measurement and control device's tripping operation protection terminal, and control circuit II is connected in the station on the allowwing of closing a floodgate return circuit on the spot, and control circuit III is connected in the station on the allowwing of closing a floodgate return circuit's distant place, and control circuit III is parallelly connected with the heavy dynamic relay.
As shown in figure 2, an isolation closing point and a connecting sheet are arranged on the control loop I, the isolation closing point and the connecting sheet are connected in series, and the isolation closing point and the connecting sheet are connected in series between a power supply line and a trip protection terminal of the microcomputer protection measurement and control device.
As shown in fig. 3, the control loop ii is connected to the front end of a closing terminal G15 of the microcomputer protection measurement and control device, and the control loop ii is provided with a normally-open point of the disconnecting switch and a normally-closed point of the disconnecting switch, which are connected in parallel.
As shown in fig. 4, a forced permission change-over switch is provided on the control circuit iii, and a switching point of the forced permission change-over switch is bridged between the first terminal and the second terminal of the reset relay.
The linkage of a disconnecting switch and a circuit breaker is realized through a mechanical structure by frequently adopting a mode of additionally arranging an electromagnetic lock in the GG1A high-voltage cabinet, the electromagnetic lock locks an operating connecting rod of the disconnecting switch to be incapable of performing on-off operation as long as the circuit breaker is switched on, but the electromagnetic lock is frequently in the field to have mechanical fault, and at the moment, the function fails to bring very serious potential safety hazard. In order to reduce hidden danger and avoid the failure of the five-prevention function when the electromagnetic lock is in failure, the transformation of an electric loop is considered. A secondary loop is transformed from an access isolation closing point GK1 to the front end of a tripping protection terminal G18 of the microcomputer protection measurement and control device, when equipment normally operates, namely, the equipment is in a load operation state, a normally closing point GK1 of the isolation switch is opened, and a protection terminal of the microcomputer protection measurement and control device does not act; once the isolating switch is pulled open with load, the normally closed point GK1 of the isolating switch is closed, and a protection tripping circuit of a protection terminal G18 of the microcomputer protection measurement and control device is switched on, so that the circuit breaker is immediately tripped, and the occurrence of arc light is effectively avoided. As shown in the figure, in this embodiment, the model of the microcomputer protection measurement and control device is DEP-595.
When the operation and maintenance personnel are used for overhauling or testing, the disconnecting switch is required to be pulled away from the upper horizontal bus, namely the circuit breaker is required to be normally switched on and switched off under the disconnecting condition of the disconnecting switch. The normally-open point GK2 of the isolating switch and the normally-closed point GK3 of the isolating switch are connected in parallel and then are connected in series on a closing loop in the station; when the equipment normally operates, a normally-open point GK2 of the isolating switch is closed, a normally-closed point CK3 of the isolating switch is opened, and a closing loop is normal; when the isolating switch is pulled open in the overhaul test, the normally open point CK2 of the isolating switch is opened, the normally closed point CK3 of the isolating switch is closed, the normally closed point of the isolating switch is in short circuit with all external associated condition contacts, and the breaker can be normally switched on in the overhaul test. If the auxiliary point of the isolating switch is not enough, the local position contact of the remote/local change-over switch in the mining cabinet is connected in parallel with the closing loop, and the function that the breaker can be normally opened and closed no matter in a maintenance test or a normal operation state is realized.
A remote closing permission signal is sent by a background of a microcomputer protection measurement and control device by adopting a reclosing relay SR-M5025 in a GG1A high-voltage cabinet, when the background loses power, the permission signal cannot be connected, so that remote closing cannot be realized, a forced permission change-over switch SA2 is added, a change-over switch point is bridged between a first terminal and a second terminal of the reclosing relay SR-M5025, when the background of the microcomputer protection measurement and control device loses power, the reclosing relay SR-M5025 fails, and forced permission can be realized by the forced permission change-over switch SA2, so that remote PLC and field operation box closing operation is realized.
The utility model discloses a problem of high-voltage board on-load switching-off is solved in control circuit's improvement, prevent that the on-load from dividing, closing isolator, when the circuit breaker is in the combined floodgate state, isolator can not divide, close the operation, only when the circuit breaker is in the separating brake state, isolator can divide, close the floodgate operation, solve because using throughout the year, five prevent interlocking measure in the high-voltage board is incomplete, give the problem of site personnel and safety in production agency hidden danger, improve and press the interior safety in utilization of cabinet.
Claims (4)
1. A GG1A high-voltage board prevents control circuit that area load pulled brake which characterized in that: the control circuit I is connected between a power supply line and a tripping protection terminal of a microcomputer protection measurement and control device, the control circuit II is connected to the local allowance of a closing circuit in a station, the control circuit III is connected to the remote allowance of the closing circuit in the station, and the control circuit III is connected with a re-acting relay in parallel.
2. The control loop of GG1A high-voltage cabinet for preventing the switch-off under load according to claim 1, wherein: the control circuit I is provided with an isolation closing point and a connecting sheet, the isolation closing point and the connecting sheet are connected in series, and the isolation closing point and the connecting sheet are connected in series between a power supply line and a tripping protection terminal of the microcomputer protection measurement and control device.
3. The control loop of GG1A high-voltage cabinet for preventing the switch-off under load according to claim 1, wherein: and the control loop II is connected to the front end of a closing terminal of the microcomputer protection measurement and control device, and is provided with a normally-open point of the isolating switch and a normally-closed point of the isolating switch which are connected in parallel.
4. The control loop of GG1A high-voltage cabinet for preventing the switch-off under load according to claim 1, wherein: and a forced permission change-over switch is arranged on the control circuit III, and a switch point of the forced permission change-over switch is bridged between the first terminal and the second terminal of the re-acting relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021328235.0U CN213400928U (en) | 2020-07-08 | 2020-07-08 | Control loop for preventing switching-off with load of GG1A high-voltage board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021328235.0U CN213400928U (en) | 2020-07-08 | 2020-07-08 | Control loop for preventing switching-off with load of GG1A high-voltage board |
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| CN213400928U true CN213400928U (en) | 2021-06-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116027706A (en) * | 2022-12-22 | 2023-04-28 | 成都长城开发科技股份有限公司 | Metering device capable of setting refusing remote switch-off |
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2020
- 2020-07-08 CN CN202021328235.0U patent/CN213400928U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116027706A (en) * | 2022-12-22 | 2023-04-28 | 成都长城开发科技股份有限公司 | Metering device capable of setting refusing remote switch-off |
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