CN215869139U

CN215869139U - Closing locking control loop of high-voltage switch

Info

Publication number: CN215869139U
Application number: CN202121717415.2U
Authority: CN
Inventors: 张佳音
Original assignee: DATANG HUNCHUN POWER PLANT
Current assignee: DATANG HUNCHUN POWER PLANT
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-02-18
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a closing and locking control loop of a high-voltage switch, which is characterized by comprising the following components: a power supply conversion module is connected to an alternating current loop of the remote controller; the first output end of the power supply conversion module is connected in series with the action switch-out contact of the high-voltage switch cabinet protection device, and the second output end of the power supply conversion module is connected in series with the intermediate relay and then is connected into the high-voltage switch cabinet protection device; the power supply conversion module connects a low-voltage direct-current power supply to the high-voltage switch cabinet protection device; and the normally closed contact of the intermediate relay is connected into the alternating current loop of the remote controller in a series connection mode.

Description

Closing locking control loop of high-voltage switch

Technical Field

The utility model relates to the technical field of electrical control of a station service high-voltage switch of a power plant, in particular to a closing and locking control loop of the high-voltage switch.

Background

In a factory power system of a power plant, remote closing and opening control output of part of high-voltage switches is realized by a remote controller sending a holding instruction, the output instruction controls an alternating current contactor, after the switches are closed remotely, the alternating current contactor is excited all the time, and a normally open contact of the remote closing is closed all the time. When the primary equipment has a fault and the switch trips, if an anti-tripping loop inside the protection device is abnormal, the high-voltage switch is switched on again to the fault, so that the accident is enlarged.

Therefore, the closing control loop of the high-voltage switch needs to be further optimized to meet the safe and stable operation of the high-voltage electrical equipment.

Disclosure of Invention

The technical scheme of the utility model provides a closing and locking control loop of a high-voltage switch, which aims to solve the problem that the high-voltage switch is frequently closed and opened to a fault.

In order to solve the above problem, the present invention provides a closing and locking control circuit for a high voltage switch, wherein the circuit comprises:

a power supply conversion module is connected to an alternating current loop of the remote controller;

the first output end of the power supply conversion module is connected in series with the action switch-out contact of the high-voltage switch cabinet protection device, and the second output end of the power supply conversion module is connected in series with the intermediate relay and then is connected into the high-voltage switch cabinet protection device; the power supply conversion module connects a low-voltage direct-current power supply to the high-voltage switch cabinet protection device;

and the normally closed contact of the intermediate relay is connected into the alternating current loop of the remote controller in a series connection mode.

Preferably, the remote controller ac loop voltage is 220 volts.

Preferably, the low voltage dc power supply is 48 vdc.

Preferably, the method is characterized by further comprising the following steps: after the protection action of the high-voltage switch cabinet protection device, the power supply of the remote controller in the remote controller alternating-current loop is disconnected by driving the normally closed contact of the intermediate relay.

Preferably, the power conversion module converts 220 v ac power to 48 v dc power.

Preferably, the input of the coil of the intermediate relay is 48-volt direct current power supply, and the normally closed contact output of the intermediate relay is 220-volt alternating current power supply.

According to the technical scheme, a power supply loop of the remote controller is improved, a normally closed contact of a protection action intermediate relay is connected in series in the power supply loop of the remote controller, when primary equipment fails and a high-voltage switch performs protection action, the intermediate relay is excited, the normally closed contact is opened, the remote controller is powered off, a contactor for closing is demagnetized, and the closing loop is locked. Even if the anti-tripping loop in the protection device is abnormal after fault tripping, the switch can not be switched on again.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

fig. 1 is a schematic diagram of a closing control loop of a high-voltage switch according to a prior embodiment; and

fig. 2 is a schematic diagram of a closing locking control loop of a high-voltage switch according to a preferred embodiment of the utility model.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 is a schematic diagram of a closing control circuit of a high-voltage switch according to a conventional embodiment. In fig. 1, 1 is a remote controller closing output holding command contact, and 2 is a remote closing and opening contactor coil.

Fig. 2 is a schematic diagram of a closing locking control loop of a high-voltage switch according to a preferred embodiment of the utility model. In fig. 2, 1 is a 220 v ac to 48 v dc power conversion module, 2 is a closing latching intermediate relay coil, 3 is an operation opening contact of a high-voltage switch cabinet protection device, 4 is a closing latching intermediate relay normally closed contact, 5 is a closing output holding instruction contact of a remote controller, and 6 is a remote closing and opening contactor coil.

The utility model discloses a can solve the protection device and open the plate and can't insert 220V AC power, and 220V AC power inserts the risk of AC string direct current in high tension switchgear and protection device, so increased 220V AC to 48V direct current power module and a coil voltage is 48V, the output contact is the closing shutting intermediate relay 8K5 of 220V, be used for driving the normally closed contact of intermediate relay after the protection action, disconnect the remote controller power; meanwhile, a 220V alternating current power supply connected with the high-voltage switch cabinet and the protection device is changed into a 48V direct current power supply, so that the risk of alternating current and direct current is avoided.

Fig. 2 provides a closing locking control loop of a high-voltage switch, which is characterized in that the loop comprises: a power supply conversion module is connected to an alternating current loop of the remote controller; preferably, the remote controller ac loop is 220 volts.

The first output end of the power supply conversion module is connected in series with the action switch contact of the high-voltage switch cabinet protection device, and the second output end of the power supply conversion module is connected in series with the intermediate relay and then is connected into the high-voltage switch cabinet protection device; the power supply conversion module connects a low-voltage direct-current power supply to the high-voltage switch cabinet protection device; preferably, the power conversion module converts 220 volt ac power to 48 volt dc power. Preferably, the low voltage dc power supply is 48 volts dc.

The normally closed contact of the intermediate relay is connected to the alternating current loop of the remote controller in a series connection mode. Preferably, the coil input of the intermediate relay is 48V DC power supply, and the normally closed contact output of the intermediate relay is 220V AC power supply.

Preferably, the method further comprises the following steps: after the protection action of the high-voltage switch cabinet protection device, the power supply of the remote controller in the alternating-current loop of the remote controller is disconnected by driving the normally closed contact of the intermediate relay.

The utility model adds a power supply conversion module in the original circuit to convert 220V AC into 48V DC, and adds an intermediate relay 8K 5. The coil of the intermediate relay is 48 volts, and the contact output is 220 volts alternating current. The utility model connects the 48 volt output end of the power supply conversion module with the coil of the intermediate relay 8K5 and the normally open contact of the protection action of the high-voltage switch cabinet protection device in series, and then connects a normally closed contact of the intermediate relay 8K5 in series to the alternating current 220 volt power supply loop of the remote controller.

In the utility model, when primary equipment has a fault and a high-voltage switch has a protection action, the outlet contact of the protection action is closed, the intermediate relay 8K5 is excited, the normally closed contact is opened, the local controller 220V controls the power supply to be powered off, the high-voltage switch-on contactor is de-energized, the normally closed contact of the contactor is opened, and the switch-on loop is closed. At the moment, even if the anti-tripping loop in the protection device is abnormal, the high-voltage switch cannot be switched on again, so that the expansion of accidents is avoided.

The utility model discloses a switching-on locking control loop of an industrial high-voltage switch, which can directly cut off a power supply of a remote controller to lock the switching-on loop when an electrical primary device is tripped by fault protection action and the anti-tripping loop is abnormal. Effectively avoid high tension switchgear to close a floodgate again to the trouble on, cause the expansion of accident. The safety is high, the performance is stable, the wiring is simple, the investment is low, and the popularization value is good.

The utility model has been described with reference to a few embodiments. However, other embodiments of the utility model than the one disclosed above are equally possible within the scope of the utility model, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims

1. A high-voltage switch closing locking control loop is characterized by comprising:

2. The circuit of claim 1, wherein the remote controller ac loop voltage is 220 volts.

3. The circuit of claim 1, wherein the low voltage dc power source is 48 volts dc.

4. The circuit of claim 1, further comprising: after the protection action of the high-voltage switch cabinet protection device, the power supply of the remote controller in the remote controller alternating-current loop is disconnected by driving the normally closed contact of the intermediate relay.

5. The circuit of claim 1, wherein the power conversion module converts 220 volts ac power to 48 volts dc power.

6. The circuit of claim 1, wherein the coil of the intermediate relay has an input of 48 volts dc and the normally closed contact output of the intermediate relay has a 220 volts ac.