CN212969055U - A GIS line side quick grounding switch locking device - Google Patents
A GIS line side quick grounding switch locking device Download PDFInfo
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- CN212969055U CN212969055U CN202021625584.9U CN202021625584U CN212969055U CN 212969055 U CN212969055 U CN 212969055U CN 202021625584 U CN202021625584 U CN 202021625584U CN 212969055 U CN212969055 U CN 212969055U
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Abstract
本实用新型涉及一种GIS线路侧快速接地开关闭锁装置，属于接地开关安全操作技术领域。该装置包括快速接地开关、快速接地开关的控制回路、电压互感器以及电流互感器，还包括：欠电压继电器，连接在电压互感器的二次侧线路上；欠电压继电器的常开触点，串联在快速接地开关的控制回路中。本实用新型当电压值大于等于欠电压继电器的动作值，欠电压继电器不动作，欠电压继电器的常开触点保持断开状态；当电压值小于欠电压继电器的动作值，欠电压继电器动作，欠电压继电器的常开触点闭合，因此只有在线路中的电压小的情况下，才允许接地开关进行分、合闸操作，不会出现电压值超出快速接地开关的感应电压，进而不会影响快速接地开关的使用寿命。
The utility model relates to a fast grounding switch locking device on a GIS line side, which belongs to the technical field of grounding switch safe operation. The device includes a fast grounding switch, a control loop of the fast grounding switch, a voltage transformer and a current transformer, and further includes: an undervoltage relay connected to the secondary side line of the voltage transformer; a normally open contact of the undervoltage relay, It is connected in series in the control loop of the fast grounding switch. When the voltage value of the utility model is greater than or equal to the action value of the under-voltage relay, the under-voltage relay does not act, and the normally open contact of the under-voltage relay remains in a disconnected state; when the voltage value is less than the action value of the under-voltage relay, the under-voltage relay acts, The normally open contact of the undervoltage relay is closed, so only when the voltage in the line is small, the grounding switch is allowed to perform opening and closing operations, and there will be no voltage value exceeding the induced voltage of the fast grounding switch, which will not affect Lifetime of quick earthing switches.
Description
Technical Field
The utility model relates to a quick earthing switch blocking device of GIS line side belongs to earthing switch safe operation technical field.
Background
The quick grounding switch is usually installed on the line side of a wire inlet and outlet interval of a substation distribution device and has certain capability of closing short-circuit current and electromagnetic induction current. In the same-tower double-circuit transmission line, when a maintenance worker overhauls the same-tower double-circuit transmission line, after a line ground fault is cut off, the adjacent running lines supply power to form a secondary arc current of a fault line, the secondary arc current is eliminated by closing the quick grounding switch, and then the grounding switch is quickly disconnected, so that the success of automatic reclosing of the line can be ensured.
However, when the maintenance personnel overhaul, whether the line is electrified or not is sometimes easily ignored, and if the line is electrified, the closing of the grounding switch can cause electrical equipment accidents and casualties. Therefore, the quick grounding switch needs to be locked, when the line is electrified, the quick grounding switch is locked, the grounding switch is prevented from being closed under electrification, the five-prevention requirement is met, and the normal operation of the power equipment is ensured; when the line is free of electricity, the locking is released, the rapid grounding switch is allowed to be switched on and off, the capacitance current generated by the static induction and the inductance current generated by the electromagnetic induction of the parallel overhead line are eliminated, and the overhauling safety is ensured.
In the prior art, as shown in fig. 1 and 2, a high-voltage live display locking device (VD) is installed on a bus at an outlet side, a signal output circuit of the VD controls and connects an electromagnetic lock VD-1 on a line of the quick grounding switch, when a voltage on the bus exceeds a certain value, the electromagnetic lock VD-1 is disconnected, closing and opening operations of the quick grounding switch are prohibited, and when the voltage on the bus is less than the certain value, the electromagnetic lock VD-1 is closed, so that the closing and opening operations of the quick grounding switch can be performed, and the locking of the quick grounding switch is realized.
However, there are certain limitations to using VD latching: the critical value of the line with electricity and without electricity detected by the VD is between 26% Ue and 69% Ue, the setting value of a common manufacturer is 45% Ue, namely 57kV, the value is used as the threshold value of the electricity and the no electricity to lock the rapid grounding switch, and the requirement that the switching induction voltage of the rapid grounding switch is far more than 15kV of the 220kV is met. Under the condition, when the rapid grounding switch is switched on or switched off, the moving contact and the static contact are ablated to a certain extent, so that the integral resistance is increased, the through-current capacity is reduced, and the service life of the contacts is shortened.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a quick earthing switch blocking device of GIS line side for solve the problem that current shutting mode influences quick earthing switch life-span.
In order to achieve the above object, the present application provides a technical solution of a locking device for a fast grounding switch on a GIS line side, which includes a fast grounding switch, a control loop of the fast grounding switch, a voltage transformer and a current transformer, and further includes:
the under-voltage relay is connected to a secondary side circuit of the voltage transformer;
the normally open contact of the under-voltage relay is connected in series in the control loop of the quick grounding switch.
The utility model discloses a quick earthing switch blocking device of GIS line side's technical scheme's beneficial effect is: the utility model discloses set up undervoltage relay on voltage transformer's secondary side circuit to undervoltage relay's normally open contact establishes ties in quick earthing switch's control circuit, has realized quick earthing switch's shutting. The working principle of the undervoltage relay is as follows: the voltage value is larger than or equal to the action value of the undervoltage relay, the undervoltage relay does not act, and a normally open contact of the undervoltage relay keeps a disconnected state; when the magnitude of voltage is less than the magnitude of action of undervoltage relay, the normally open contact of undervoltage relay is closed, consequently only under the condition that the voltage in the circuit is little, the normally open contact of undervoltage relay is closed, just allows earthing switch to carry out the operation of separating, closing a floodgate, the magnitude of voltage can not appear and surpass quick earthing switch's induced voltage, and then can not influence quick earthing switch's life.
Furthermore, in order to avoid the influence of overlarge current on the service life of the quick grounding switch, the quick grounding switch further comprises an air switch, and a control coil of the air switch is connected to a secondary side circuit of the current transformer; the first auxiliary contact of the air switch is connected in series with the normally open contact of the under-voltage relay.
Furthermore, the air switch further comprises a second auxiliary contact of the air switch, and the second auxiliary contact is connected to a secondary side circuit of the voltage transformer.
Further, the operating value range of the undervoltage relay is 5V-54.5V.
Drawings
FIG. 1 is a prior art 252kV GIS main wiring diagram;
FIG. 2 is a diagram of a prior art quick ground switch lockout;
FIG. 3 is the 252kV GIS main wiring diagram of the present invention;
FIG. 4 is a line side single phase VT loop diagram of the present invention;
fig. 5 is a schematic circuit diagram of the line-side fast grounding switch blocking device of the present invention.
Detailed Description
GIS line side fast grounding switch blocking device embodiment:
the utility model discloses use 252kV GIS as an example to carry out the detailed description to the quick earthing switch blocking device of GIS line side, as shown in fig. 3, 252kV GIS is double bus connection, in fig. 3, DS1, DS2, DS3 are isolator (disconnecting link), ES2, ES3 close earthing switch for the maintenance, CT1, CT2 are current transformer, GCB is the circuit breaker, HES1 is quick earthing switch, VT is voltage transformer. Meanwhile, DS3 and ES3 can be realized by adopting a three-position switch.
The GIS line side fast grounding switch locking device is described by taking a single-phase a-phase voltage transformer VT as an example, and as shown in fig. 4 and 5, the device comprises a fast grounding switch HES1, a control loop of a fast grounding switch HES1, the voltage transformer VT, a current transformer CT2, an air switch, a first auxiliary contact 8VT1-1 of the air switch, a second auxiliary contact 8VT1 of the air switch, an undervoltage relay 27L, and a normally open contact 27L-1 of the undervoltage relay 27L.
The undervoltage relay 27L and the second auxiliary contact 8VT1 of the air switch are connected to the secondary side line of the voltage transformer VT; the normally open contact 27L-1 of the undervoltage relay 27L and the first auxiliary contact 8VT1-1 of the air switch are connected in series in the control loop of the quick grounding switch HES 1; the control coil of the air switch is connected to the secondary line of the current transformer CT 2.
The undervoltage relay 27L is a relay with a settable action value and has a rated voltage of
The action value is 5V-54.5V, and the factory setting is generally 6.8V. The utility model discloses in, undervoltage relay 27L is set as required for the action value, and undervoltage relay 27L's theory of operation does: when the input voltage is smaller than the action value, the under-voltage relay 27L acts, and the normally open contact 27L-1 is closed; when the input voltage is equal to or greater than the operation value, the undervoltage relay 27L does not operate, and the normally open contact 27L-1 is kept in the off state.
The working process of the GIS line side quick grounding switch locking device is as follows:
when the current is too large, the air switch acts, the second auxiliary contact 8VT1 of the air switch is disconnected, the first auxiliary contact 8VT1-1 of the air switch is disconnected, the control coil of the under-voltage relay 27L has no input, the circuit can not be judged to be electrified or not electrified, the voltage relay 27L does not act, the normally open contact 27L-1 keeps a disconnected state, and the quick grounding switch HES1 is locked at the moment;
when the current is in a set range, the second auxiliary contact 8VT1 of the air switch is closed, the first auxiliary contact 8VT1-1 of the air switch is closed, when the line is not electrified, the actual voltage value on the secondary side line of the voltage transformer VT is smaller than the action value of the under-voltage relay 27L, the under-voltage relay 27L acts, the normally open contact 27L-1 is closed, and the rapid grounding switch HES1 is allowed to operate;
when the current is in the set range, the second auxiliary contact 8VT1 of the air switch is closed, the first auxiliary contact 8VT1-1 of the air switch is closed, when the line is electrified, the actual voltage value on the secondary side line of the voltage transformer VT is larger than or equal to the action value of the under-voltage relay 27L, the under-voltage relay 27L does not act, the normally open contact 27L-1 is opened, and the quick grounding switch HES1 is locked.
In the above embodiment, the control coil of the air switch is connected to the secondary line of the current transformer CT2, and when the current collected by the current transformer CT2 is too large, the auxiliary contacts of the air switch are all disconnected, and the fast grounding switch HES1 is locked, so that the protection of the fast grounding switch HES1 can be enhanced, and the fast grounding switch HES1 is prevented from being damaged due to too large current. And two auxiliary contacts are arranged for double protection. In another embodiment, only one auxiliary contact may be provided, or when the guaranteed voltage is low and the current is also low, the air switch and its auxiliary contact may not be provided, and the undervoltage relay and its normally open contact may be used to close the fast grounding switch HES 1.
The utility model discloses undervoltage relay 27L and the air switch that utilize the action value to set have realized quick earthing switch's shutting to based on undervoltage relay 27L's theory of operation, can avoid quick earthing switch to operate because of voltage, electric current are too big and reduce the life-span.
Claims (4)
1. The utility model provides a quick earthing switch blocking device of GIS line side, includes quick earthing switch, quick earthing switch's control circuit, voltage transformer and current transformer, its characterized in that still includes:
the under-voltage relay is connected to a secondary side circuit of the voltage transformer;
the normally open contact of the under-voltage relay is connected in series in the control loop of the quick grounding switch.
2. The GIS line side fast grounding switch locking device according to claim 1, further comprising an air switch, wherein a control coil of the air switch is connected to a secondary line of the current transformer; the first auxiliary contact of the air switch is connected in series with the normally open contact of the under-voltage relay.
3. The GIS line side fast ground switch lockout of claim 2 further comprising a second auxiliary contact of an air switch, said second auxiliary contact connected on a secondary side line of said voltage transformer.
4. The GIS line side fast grounding switch lockout device of claim 1 wherein the under voltage relay has an operating value range of 5V to 54.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021625584.9U CN212969055U (en) | 2020-08-06 | 2020-08-06 | A GIS line side quick grounding switch locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021625584.9U CN212969055U (en) | 2020-08-06 | 2020-08-06 | A GIS line side quick grounding switch locking device |
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| CN212969055U true CN212969055U (en) | 2021-04-13 |
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| CN202021625584.9U Active CN212969055U (en) | 2020-08-06 | 2020-08-06 | A GIS line side quick grounding switch locking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116203493A (en) * | 2021-12-01 | 2023-06-02 | 河南平芝高压开关有限公司 | Measuring device and measuring method of high-voltage electrified display device |
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2020
- 2020-08-06 CN CN202021625584.9U patent/CN212969055U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116203493A (en) * | 2021-12-01 | 2023-06-02 | 河南平芝高压开关有限公司 | Measuring device and measuring method of high-voltage electrified display device |
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