An operating power control circuit for a circuit breaker / disconnector

Abstract

The application provides an operating power control circuit of a circuit breaker / disconnector, and belongs to the field of GIS switch devices. The control circuit comprises an electromagnetic contactor, an open auxiliary contact of the electromagnetic contactor is connected in series in an operating power circuit of the circuit breaker / disconnector, and a double-position relay, the double-position relay comprises a reset coil, a setting coil and an open auxiliary contact; wherein a remote disconnecting interface of a circuit breaker / disconnector intelligent terminal and the reset coil of the double-position relay are connected in series to form a first branch circuit, a remote connecting interface of the circuit breaker / disconnector intelligent terminal and the setting coil of the double-position relay are connected in series to form a second branch circuit, and the open auxiliary contact of the double-position relay and the coil of the electromagnetic contactor are connected in series to form a third branch circuit; the first branch circuit, the second branch circuit and the third branch circuit are connected in parallel and then connected in series between the positive electrode and the negative electrode of a remote control power supply of the circuit breaker / disconnector. The application can safely and quickly remotely turn on and turn off the operating power circuit of the circuit breaker / disconnector.

Description

Technical Field

[0001] This invention relates to an operating power supply control circuit for a circuit breaker / disconnector, belonging to the technical field of GIS switchgear. Background Technology

[0002] Currently, domestic GIS switchgear (i.e., SF6 gas-insulated metal-enclosed switchgear) manufacturers generally install the circuit breaker / disconnector operating power supply circuit breaker inside the control cabinet, and the control circuit is as follows: Figure 1 As shown, whenever circuit breakers / disconnect switches need to be opened or closed, manual on-site operation of each circuit breaker / disconnect switch's operating power supply is required, which is not only labor-intensive but also poses significant safety hazards. With the increasing intelligence of substations, more and more customers hope to minimize on-site manual operation and achieve the opening and closing of circuit breakers / disconnect switches as much as possible through remote control of the GIS control cabinet. Therefore, remote control of the opening and closing of circuit breaker / disconnect switch operating power supplies has significant practical implications. Summary of the Invention

[0003] The purpose of this invention is to provide an operating power supply control circuit for circuit breakers / disconnectors, which can realize remote control of the on / off state of the operating power supply circuit of circuit breakers / disconnectors, in a safe and fast manner.

[0004] To achieve the above objectives, the present invention provides an operating power supply control circuit for a circuit breaker / disconnecting switch, the operating power supply control circuit comprising:

[0005] Electromagnetic contactor, the normally open auxiliary contact of the electromagnetic contactor is connected in series in the operating power supply circuit of the circuit breaker / disconnector;

[0006] The dual-position relay includes a reset coil, a set coil, and a normally open auxiliary contact. The remote opening interface of the circuit breaker / disconnector intelligent terminal is connected in series with the reset coil of the dual-position relay to form the first branch; the remote closing interface of the circuit breaker / disconnector intelligent terminal is connected in series with the set coil of the dual-position relay to form the second branch; and the normally open auxiliary contact of the dual-position relay and the coil of the electromagnetic contactor are connected in series to form the third branch. The first, second, and third branches are connected in parallel and then connected in series between the positive and negative terminals of the circuit breaker / disconnector remote control power supply.

[0007] The beneficial effects of this invention are as follows: This invention connects the normally open auxiliary contact of the electromagnetic contactor in series in the operating power supply circuit of the circuit breaker / disconnector; connects the reset coil of the dual-position relay in series at the remote opening interface of the circuit breaker / disconnector's intelligent terminal; connects the set coil of the dual-position relay in series at the remote closing interface; and connects the normally open auxiliary contact of the dual-position relay and the coil of the electromagnetic contactor in series between the positive and negative terminals of the remote control power supply. Because the normally open auxiliary contact of the dual-position relay closes when its set coil is energized and opens when its reset coil is energized, remote opening / closing commands can be issued via the intelligent terminal to control the dual-position relay. The relay's set or reset coil is energized, which in turn energizes or de-energizes the electromagnetic contactor's coil through the opening and closing of the normally open auxiliary contacts of the dual-position relay. Finally, the opening and closing of the electromagnetic contactor's normally open auxiliary contacts connects and disconnects the operating power circuit of the circuit breaker / disconnector. This invention enables safe and rapid remote connection and disconnection of the circuit breaker / disconnector's operating power circuit. Under circuit breaker / disconnector opening and closing conditions, it can effectively reduce on-site manual operation of the control cabinet circuit breaker, save operation time, improve work efficiency, and avoid safety accidents. It has practical significance for improving the operational safety and stability of power equipment.

[0008] Furthermore, in the aforementioned circuit breaker / disconnector operating power control circuit, when the remote closing interface of the circuit breaker / disconnector intelligent terminal is closed, the set coil of the dual-position relay is energized, causing the normally open auxiliary contact of the dual-position relay to close, which in turn energizes the coil of the electromagnetic contactor, causing the normally open auxiliary contact of the electromagnetic contactor to close, thereby connecting the circuit breaker / disconnector operating power circuit; when the remote opening interface of the circuit breaker / disconnector intelligent terminal is closed, the reset coil of the dual-position relay is energized, causing the normally open auxiliary contact of the dual-position relay to open, which in turn de-energizes the coil of the electromagnetic contactor, causing the normally open auxiliary contact of the electromagnetic contactor to open, thereby disconnecting the circuit breaker / disconnector operating power circuit.

[0009] Furthermore, in the operating power control circuit of the circuit breaker / disconnector mentioned above, the operating power control circuit also includes a remote / local handle. The remote / local handle includes two local control contacts and one remote control contact. The two local control contacts of the remote / local handle are connected in parallel with the normally open auxiliary contacts of the electromagnetic contactor, and the remote control contact of the remote / local handle is connected in series in the third branch.

[0010] Furthermore, in the operating power control circuit of the aforementioned circuit breaker / disconnector, in the non-maintenance state, the remote / local handle is switched to the remote control position, causing the local control contact to open and the remote control contact to close; in the maintenance state, the remote / local handle is switched to the local control position, causing the local control contact to close and the remote control contact to open.

[0011] The beneficial effects of this are as follows: by setting the remote / local handle, the operating mode of the operating power control circuit can be selected: in non-maintenance mode, moving the remote / local handle to the remote control position will disconnect the local control contact and close the remote control contact, enabling remote switching of the circuit breaker / disconnector operating power circuit; in maintenance mode, moving the remote / local handle to the local control position will close the local control contact and disconnect the remote control contact, enabling manual switching of the circuit breaker / disconnector operating power circuit.

[0012] Furthermore, in the operating power control circuit of the circuit breaker / disconnector mentioned above, the operating power control circuit also includes two local switches and one remote switch. Each local switch is connected in parallel with the normally open auxiliary contact of the electromagnetic contactor, and the remote switch is connected in series in the third branch.

[0013] Furthermore, in the operating power control circuit of the aforementioned circuit breaker / disconnector, in the non-maintenance state, the local switch is disconnected and the remote switch is closed; in the maintenance state, the local switch is closed and the remote switch is disconnected.

[0014] The beneficial effects of this approach are as follows: by setting up two local switches and one remote switch, it is possible to switch between remote on / off and manual on / off: in maintenance mode, closing the local switch and opening the remote switch enables manual on / off of the circuit breaker / disconnector operating power circuit; in non-maintenance mode, opening the local switch and closing the remote switch enables remote on / off of the circuit breaker / disconnector operating power circuit.

[0015] Furthermore, in the operating power control circuit of the circuit breaker / disconnector mentioned above, an air circuit breaker is also connected in series in the operating power control circuit of the circuit breaker / disconnector.

[0016] Furthermore, in the operating power control circuit of the circuit breaker / disconnector mentioned above, the operating power control circuit also includes a pressure plate, one end of which is connected to the positive terminal of the remote control power supply, and the other end is connected to the parallel connection point of the remote disconnect interface and the remote close interface. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the operating power supply circuit of a circuit breaker / disconnector in the prior art;

[0018] Figure 2 This is a schematic diagram of the operating power supply control circuit of the circuit breaker / disconnecting switch in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Example of operating power supply control circuit:

[0021] like Figure 2 As shown, the operating power control circuit of the circuit breaker / disconnector in this embodiment (hereinafter referred to as the operating power control circuit) includes: a remote / local handle 43RL, a dual-position relay ZJ, and an electromagnetic contactor 1K. The remote / local handle 43RL includes two local control contacts (i.e., 43RL local control 1-2, 5-6) and one remote control contact (i.e., 43RL remote control 7-8). The dual-position relay ZJ includes a reset coil (2-9), a set coil (1-10), and a normally open auxiliary contact (21-22). The electromagnetic contactor 1K includes a coil (A1-A2) and a normally open auxiliary contact (1-2, 3-4).

[0022] Among them, the normally open auxiliary contacts (1-2, 3-4) of electromagnetic contactor 1K and the circuit breaker 8D4 are connected in series in the operating power supply circuit of the circuit breaker / disconnector. The two proximity control contacts of remote / local handle 43RL are connected in parallel with the normally open auxiliary contacts of electromagnetic contactor 1K, specifically: 43RL proximity control 1-2 is connected in parallel on both sides of auxiliary contact 1-2 of electromagnetic contactor 1K, and 43RL proximity control 5-6 is connected in parallel on both sides of auxiliary contact 3-4 of electromagnetic contactor 1K.

[0023] The remote opening interface (1-4n-5021, 5022) of the circuit breaker / disconnector intelligent terminal 1-4n is connected in series with the reset coil (2-9) of the dual-position relay ZJ to form the first branch. The remote closing interface (1-4n-5023, 5024) of the circuit breaker / disconnector intelligent terminal is connected in series with the set coil (1-10) of the dual-position relay ZJ to form the second branch. The remote control contact (i.e., 43RL remote control 7-8) of the remote / local handle 43RL, the auxiliary contact (21-22) of the dual-position relay ZJ, and the coil (A1-A2) of the electromagnetic contactor are connected in series to form the third branch. The first, second, and third branches are connected in parallel and then connected in series between the positive and negative terminals of the circuit breaker / disconnector remote control power supply. The positive terminal of the remote control power supply is connected to the parallel connection point of the remote opening interface and the remote closing interface of the circuit breaker / disconnector intelligent terminal via the pressure plate 1-4CLP. In this embodiment, the remote control power supply for the circuit breaker / disconnector is drawn from the operating power supply circuit. In other embodiments, the remote control power supply may not be drawn from the operating power supply circuit and may be set up separately.

[0024] The following is combined Figure 2 The working principle of the operating power control circuit of this embodiment will be described in detail, taking the switching of the circuit breaker operating power circuit as an example. The switching of the disconnecting switch operating power circuit is similar to that of the circuit breaker and will not be described again.

[0025] (1) In non-maintenance state, remotely control the connection and disconnection of the circuit breaker operating power supply circuit;

[0026] In non-maintenance mode, turn the remote / local handle 43RL to the remote control position, so that the local control contacts 1-2 and 5-6 are open, the remote control contact 7-8 is closed, and the circuit breaker 8D4 is always in the closed state.

[0027] When it is necessary to connect the circuit breaker operating power supply circuit, the remote closing contacts (1-4n-5023, 5024) of the intelligent terminal are closed through the background control device, which energizes the set coil (1-10) of the double position relay ZJ, and closes the normally open auxiliary contact (21-22) of the double position relay ZJ. After (21-22) is closed, the coil (A1-A2) of the electromagnetic contactor 1K is energized, which closes the normally open auxiliary contact (1-2, 3-4) of the electromagnetic contactor in the circuit breaker operating power supply circuit, thus connecting the circuit breaker operating power supply circuit.

[0028] When it is necessary to disconnect the circuit breaker operating power supply circuit, the remote disconnection contacts (1-4n-5021, 5022) of the intelligent terminal are closed through the background control device, so that the reset coil (2-9) of the double position relay ZJ is energized, and the normally open auxiliary contact (21-22) of the double position relay ZJ is opened. After (21-22) is opened, the coil of the electromagnetic contactor 1K is de-energized, so that the normally open auxiliary contact (1-2, 3-4) of the electromagnetic contactor 1K is opened, and the circuit breaker operating power supply circuit is disconnected.

[0029] (2) In the on-site maintenance state, manually control the connection and disconnection of the circuit breaker operating power supply circuit;

[0030] When performing on-site maintenance, switch the remote / local handle 43RL to the local control position, so that local control contacts 1-2 and 5-6 are closed and remote control contact 7-8 is open. At this time, the circuit breaker 8D4 can be manually opened or closed to control the circuit breaker's operating power circuit to open or close, so as to carry out on-site maintenance.

[0031] In this embodiment, a remote / local handle is used to switch between remote and manual on / off states of the circuit breaker / disconnector operating power circuit, enabling the operating power control circuit of this embodiment to simultaneously possess both remote and manual on / off functions. Alternatively, depending on the actual situation, the remote / local handle can be omitted, retaining only the remote on / off function; or two local switches and one remote switch can be used to switch between remote and manual on / off states. In this case, each local switch is connected in parallel with the normally open auxiliary contact of the electromagnetic contactor, while the remote switch is connected in series in the third branch. For example, one of the local switches can be used to replace... Figure 2 The local control contacts 1-2 are replaced with another local switch. Figure 2 The local control contacts 5-6 are replaced by a remote switch. Figure 2In the case of remote control contacts 7-8, by closing the two local switches and simultaneously opening the remote switch, the circuit breaker / disconnector operation power circuit can be manually switched on and off; by opening the two local switches and simultaneously closing the remote switch, the circuit breaker / disconnector operation power circuit can be remotely switched on and off, thus realizing the switching between remote on / off and manual on / off.

[0032] In summary, utilizing the circuit breaker / disconnector switch operating power control circuit of this embodiment can effectively reduce on-site manual operation of the control cabinet circuit breakers, save operation time, improve work efficiency, and avoid safety accidents, which is of practical significance for improving the operational safety and stability of power equipment.

Claims

1. A circuit breaker / disconnector operating power supply control circuit, characterized in that, The operating power control circuit includes: Electromagnetic contactor, the normally open auxiliary contact of the electromagnetic contactor is connected in series in the operating power supply circuit of the circuit breaker / disconnector; A dual-position relay includes a reset coil, a set coil, and a normally open auxiliary contact. The remote opening interface of the circuit breaker / disconnector intelligent terminal is connected in series with the reset coil of the dual-position relay to form the first branch; the remote closing interface of the circuit breaker / disconnector intelligent terminal is connected in series with the set coil of the dual-position relay to form the second branch; and the normally open auxiliary contact of the dual-position relay and the coil of the electromagnetic contactor are connected in series to form the third branch. The first, second, and third branches are connected in parallel and then connected in series between the positive and negative terminals of the circuit breaker / disconnector remote control power supply. When the remote closing interface of the circuit breaker / disconnector intelligent terminal is closed, the set coil of the dual-position relay is energized, causing the normally open auxiliary contact of the dual-position relay to close, which in turn energizes the coil of the electromagnetic contactor, causing the normally open auxiliary contact of the electromagnetic contactor to close, thereby connecting the operating power supply circuit of the circuit breaker / disconnector. When the remote opening interface of the circuit breaker / disconnector intelligent terminal is closed, the reset coil of the dual-position relay is energized, causing the normally open auxiliary contact of the dual-position relay to open, which in turn de-energizes the coil of the electromagnetic contactor, causing the normally open auxiliary contact of the electromagnetic contactor to open, thereby disconnecting the operating power supply circuit of the circuit breaker / disconnector.

2. The operating power supply control circuit for the circuit breaker / disconnector according to claim 1, characterized in that, The operating power control circuit also includes a remote / local handle, which includes two local control contacts and one remote control contact. The two local control contacts of the remote / local handle are connected in parallel with the normally open auxiliary contacts of the electromagnetic contactor, and the remote control contact of the remote / local handle is connected in series in the third branch.

3. The operating power supply control circuit for the circuit breaker / disconnector according to claim 2, characterized in that, In non-maintenance mode, move the remote / local handle to the remote control position to disconnect the local control contact and close the remote control contact; in maintenance mode, move the remote / local handle to the local control position to close the local control contact and disconnect the remote control contact.

4. The operating power supply control circuit for the circuit breaker / disconnector according to claim 1, characterized in that, The operating power control circuit also includes two local switches and one remote switch. Each local switch is connected in parallel with the normally open auxiliary contact of the electromagnetic contactor, and the remote switch is connected in series in the third branch.

5. The operating power supply control circuit for the circuit breaker / disconnector according to claim 4, characterized in that, In non-maintenance mode, disconnect the local switch and close the remote switch; in maintenance mode, close the local switch and disconnect the remote switch.

6. The operating power supply control circuit for the circuit breaker / disconnector according to claim 5, characterized in that, An air circuit breaker is also connected in series in the operating power supply circuit of the circuit breaker / disconnecting switch.

7. The operating power supply control circuit for the circuit breaker / disconnector according to claim 4, characterized in that, An air circuit breaker is also connected in series in the operating power supply circuit of the circuit breaker / disconnecting switch.

8. The operating power supply control circuit for the circuit breaker / disconnector according to claim 6, characterized in that, The operating power control circuit also includes a pressure plate, one end of which is connected to the positive terminal of the remote control power supply, and the other end is connected to the parallel connection point of the remote disconnect interface and the remote connect interface.

9. The operating power supply control circuit for the circuit breaker / disconnector according to claim 7, characterized in that, The operating power control circuit also includes a pressure plate, one end of which is connected to the positive terminal of the remote control power supply, and the other end is connected to the parallel connection point of the remote disconnect interface and the remote connect interface.

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