A circuit for switching on and off an electric power system

Abstract

The utility model discloses a kind of power system opening and closing operation circuit, it is related to power system operating circuit technical field, to solve the existing power system under circuit breaker opening state, circuit breaker is closed again, lead to the problem of multiple jump combination. Including closing loop, opening circuit and anti-jump loop;Closing loop is used to when closing switch is closed, make circuit breaker keep closing state;Opening circuit is used to when opening switch is closed, make circuit breaker keep opening state;Anti-jump loop at least includes anti-jump relay and first opening keeping relay self-locking switch, first opening keeping relay self-locking switch is used to when circuit breaker keeps opening state and closing loop is conducted, make anti-jump loop conduction, anti-jump relay suction, make closing loop disconnect.The power system opening and closing operation circuit provided by the utility model is used to disconnect closing circuit under opening state to avoid the multiple jump combination phenomenon of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of power system operation circuit technology, and in particular to a power system opening and closing operation circuit. Background Technology

[0002] When a fault occurs in the power system, the protection device will trip the circuit breaker. If the closing circuit contacts do not reset at this time, such as if the operator has not released the handle or the closing contacts of the automatic device are stuck, the circuit breaker may close again, resulting in multiple tripping and closing phenomena. This phenomenon is called tripping. Tripping can not only damage the circuit breaker, but may also expand the scope of the accident. Utility Model Content

[0003] The purpose of this utility model is to provide a power system opening and closing operation circuit to solve the problem of multiple tripping and closing caused by the circuit breaker closing again when the circuit breaker is in the open state in the existing power system.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A power system circuit for opening and closing operation includes at least: a closing circuit, a closing circuit, and an anti-pumping circuit; the anti-pumping circuit and the closing circuit are both connected to the closing switch of a circuit breaker; the closing circuit is connected to the opening switch of the circuit breaker.

[0006] The closing circuit is used to keep the circuit breaker in the closed state when the closing switch is closed;

[0007] The tripping circuit is used to keep the circuit breaker in the tripped state when the tripping switch is closed;

[0008] The anti-pumping circuit includes at least an anti-pumping relay and a first trip holding relay self-locking switch. The first trip holding relay self-locking switch is used to activate the anti-pumping circuit when the circuit breaker is in the tripped state and the closing circuit is open, and the anti-pumping relay is energized to disconnect the closing circuit.

[0009] Optionally, the closing circuit includes a closing holding relay, a closing holding relay self-locking switch, and a first anti-pumping relay self-locking switch. One end of the closing holding relay is connected to one end of the closing holding relay self-locking switch and one end of the closing switch. The other end of the closing switch is connected to the live wire. The other end of the closing holding relay self-locking switch is connected to the live wire. The other end of the closing holding relay is connected to one end of the first anti-pumping relay self-locking switch. The other end of the first anti-pumping relay self-locking switch is connected to one end of the closing coil. The other end of the closing coil is connected to the neutral wire. One end of the anti-pumping relay is connected to the closing switch and one end of the closing holding relay self-locking switch. The other end of the anti-pumping relay is connected to one end of the first opening holding relay self-locking switch. The other end of the first opening holding relay self-locking switch is connected to the neutral wire.

[0010] Optionally, the tripping circuit includes a tripping holding relay and a second tripping holding relay self-locking switch. One end of the tripping holding relay is connected to one end of the second tripping holding relay self-locking switch and one end of the tripping switch. The other end of the second tripping holding relay self-locking switch and the other end of the tripping switch are connected to the live wire. The other end of the tripping holding relay is connected to one end of the tripping coil, and the other end of the tripping coil is connected to the neutral wire.

[0011] Optionally, the anti-pumping circuit further includes a second anti-pumping relay self-locking switch, which is connected in parallel with the first trip holding relay self-locking switch.

[0012] Optionally, the power system opening and closing operation circuit further includes a closing detection circuit. The closing detection circuit includes a closing position monitoring relay and a first closing position monitoring relay self-locking switch. One end of the closing position monitoring relay is connected to the live wire, and the other end of the closing position monitoring relay is connected to one end of the closing coil self-locking switch. The other end of the closing coil self-locking switch is connected to the neutral wire. One end of the first closing position monitoring relay self-locking switch is connected to the live wire, and the other end of the first closing position monitoring relay self-locking switch is connected to one end of the closing indicator light. The other end of the closing indicator light is connected to the neutral wire.

[0013] Optionally, the power system circuit for opening and closing operations further includes a circuit breaker detection circuit. The circuit breaker detection circuit includes a trip monitoring relay and a first trip monitoring relay self-locking switch. One end of the trip monitoring relay is connected to the live wire, and the other end of the trip monitoring relay is connected to one end of the circuit breaker coil self-locking switch. The other end of the circuit breaker coil self-locking switch is connected to the neutral wire. One end of the first trip monitoring relay self-locking switch is connected to the live wire, and the other end of the first trip monitoring relay self-locking switch is connected to one end of the circuit breaker indicator light. The other end of the circuit breaker indicator light is connected to the neutral wire.

[0014] Optionally, the closing holding relay, the opening holding relay, the closing position monitoring relay, the tripping position monitoring relay, and the anti-pumping relay are all equipped with a rectifier bridge, and a resistor is connected in series at the AC input terminal of the rectifier bridge.

[0015] Optionally, the power system opening and closing operation circuit further includes a line break monitoring circuit. The line break monitoring circuit includes a second closing position monitoring relay self-locking switch and a second tripping position monitoring relay self-locking switch. One end of the second closing position monitoring relay self-locking switch is connected to the positive terminal of the DC signal bus. The other end of the second closing position monitoring relay self-locking switch is connected to one end of the second tripping position monitoring relay self-locking switch. The other end of the second tripping position monitoring relay self-locking switch is connected to one end of an alarm signal device. The other end of the alarm signal device is connected to the negative terminal of the DC signal bus.

[0016] Optionally, when the closing holding relay is energized, the closing holding relay self-locking switch is closed; when the opening holding relay is energized, the first opening holding relay self-locking switch and the second opening holding relay self-locking switch are closed.

[0017] Optionally, when the anti-bounce relay is energized, the first anti-bounce relay self-locking switch is open and the second anti-bounce relay self-locking switch is closed; when the closed position monitoring relay is energized, the first closed position monitoring relay self-locking switch is closed and the second closed position monitoring relay self-locking switch is open; when the tripped position monitoring relay is energized, the first tripped position monitoring relay self-locking switch is closed and the second tripped position monitoring relay self-locking switch is open.

[0018] Compared with existing technologies, this utility model provides a power system opening and closing operation circuit, which includes at least: a closing circuit, a opening circuit, and an anti-pumping circuit; both the anti-pumping circuit and the closing circuit are connected to the closing switch of the circuit breaker; the opening circuit is connected to the opening switch of the circuit breaker; the closing circuit is used to keep the circuit breaker in the closed state when the closing switch is closed; the opening circuit is used to keep the circuit breaker in the open state when the opening switch is closed; the anti-pumping circuit includes at least an anti-pumping relay and a first opening holding relay self-locking switch, which is used to activate the anti-pumping circuit and activate the anti-pumping relay when the circuit breaker is in the open state and the closing circuit is conducting, thus disconnecting the closing circuit. The anti-pumping relay and the first opening holding relay self-locking switch in this solution can promptly disconnect the closing circuit when the circuit breaker is in the open state, avoiding multiple closing of the circuit breaker, thereby protecting the safety of equipment and the system. Simultaneously, the closing circuit can keep the circuit breaker in the closed state, and the opening circuit can keep the circuit breaker in the open state. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a power system opening and closing operation circuit provided by this utility model;

[0021] Figure 2 A schematic diagram of the closing hold state of the power system opening and closing operation circuit provided by this utility model;

[0022] Figure 3 A schematic diagram of the opening and closing operation circuit of the power system provided by this utility model;

[0023] Figure 4 A schematic diagram of the anti-pumping operation of the power system opening and closing operation circuit provided by this utility model.

[0024] Figure label:

[0025] FTJ - Anti-pumping relay, FTJ1 - First anti-pumping relay self-locking switch, FTJ2 - Second anti-pumping relay self-locking switch, TBJ - Opening holding relay, TBJ1 - First opening holding relay self-locking switch, TBJ2 - Second opening holding relay self-locking switch, BYJn1 - Closing switch, BYJn2 - Opening switch, HBJ - Closing holding relay, HBJ1 - Closing holding relay self-locking switch, HWJS - Closed position monitoring relay, HWJS1 - First closed position monitoring relay self-locking switch, HWJS2 - Second closed position monitoring relay self-locking switch, TWJS - Tripped position monitoring relay, TWJS1 - First tripped position monitoring relay self-locking switch, TWJS2 - Second tripped position monitoring relay self-locking switch, HQ - Closing coil, HQ1 - Closing coil self-locking switch, TQ - Opening coil, TQ1 - Opening coil self-locking switch, HD - Closing indicator light, TD - Opening indicator light. Detailed Implementation

[0026] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] To address the issue of circuit breaker tripping and closing repeatedly due to the failure of the closing circuit contacts to reset during power system faults, this invention provides a power system opening and closing operation circuit. By promptly disconnecting the closing circuit, it prevents the circuit breaker from closing repeatedly, thereby protecting the safety of equipment and the system. The following description, in conjunction with the accompanying drawings, further clarifies this issue.

[0032] See Figure 1 This utility model provides a power system circuit for opening and closing operations, comprising: a closing circuit, a opening circuit, an anti-pumping circuit, a closing detection circuit, an opening detection circuit, and a line break monitoring circuit; the anti-pumping circuit and the closing circuit are both connected to the closing switch of the circuit breaker; the opening circuit is connected to the opening switch of the circuit breaker; the line break monitoring circuit is located between the positive and negative terminals of the DC signal bus, and the closing detection circuit and the opening detection circuit are located between the neutral line N and the live line L; the closing circuit is used to keep the circuit breaker in the closed state when the closing switch is closed; the opening circuit is used to keep the circuit breaker in the open state when the opening switch is closed; the anti-pumping circuit is used to prevent the circuit breaker from repeatedly opening and closing; and the closing detection circuit is used to detect the line breakage. The circuit breaker's conduction status is monitored by a tripping detection circuit. The anti-pumping circuit includes an anti-pumping relay FTJ, a first tripping holding relay self-locking switch TBJ1, and a second anti-pumping relay self-locking switch FTJ2. The second anti-pumping relay self-locking switch FTJ2 is connected in parallel with the first tripping holding relay self-locking switch TBJ1. One end of the anti-pumping relay FTJ is connected to one end of the closing switch, and the other end is connected to one end of the first tripping holding relay self-locking switch TBJ1. The other end of the first tripping holding relay self-locking switch TBJ1 is connected to neutral (N). Because the anti-pumping relay FTJ has a relatively high coil power, adding TBJ1 can share the current carried by FTJ2. The first tripping holding relay self-locking switch TBJ1 is used to activate the anti-pumping circuit when the circuit breaker is in the tripped state and the closing circuit is conducting, causing the anti-pumping relay to engage and disconnect the closing circuit. This solution protects equipment and system safety by promptly disconnecting the closing circuit when the circuit breaker is in the tripped state, preventing multiple closing operations.

[0033] The closing circuit in the above structure includes a closing holding relay HBJ, a closing holding relay self-locking switch HBJ1, and a first anti-pumping relay self-locking switch FTJ1. One end of the closing holding relay HBJ is connected to one end of the closing holding relay self-locking switch HBJ1 and one end of the closing switch BYJn1. The other end of the closing switch BYJn1 is connected to L. The other end of the closing holding relay self-locking switch HBJ1 is connected to L. The other end of the closing holding relay HBJ is connected to one end of the first anti-pumping relay self-locking switch FTJ1. The other end of the first anti-pumping relay self-locking switch FTJ1 is connected to one end of the closing coil HQ. The other end of the closing coil HQ is connected to N.

[0034] The tripping circuit in the above structure includes a tripping holding relay TBJ and a second tripping holding relay self-locking switch TBJ2. One end of the tripping holding relay TBJ and one end of the second tripping holding relay self-locking switch TBJ2 and one end of the tripping switch BYJn2 are connected. The other end of the tripping switch BYJn2 is connected to L. The other end of the second tripping holding relay self-locking switch TBJ2 and the other end of the tripping switch are connected to L. The other end of the tripping holding relay TBJ is connected to one end of the tripping coil TQ. The other end of the tripping coil TQ is connected to N.

[0035] The closing detection circuit in the above structure includes a closing position monitoring relay HWJS and a first closing position monitoring relay self-locking switch HWJS1. One end of the closing position monitoring relay HWJS is connected to L, and the other end of the closing position monitoring relay HWJS is connected to one end of the closing coil self-locking switch HQ1. The other end of the closing coil self-locking switch HQ1 is connected to N. One end of the first closing position monitoring relay self-locking switch HWJS1 is connected to L, and the other end of the first closing position monitoring relay self-locking switch HWJS1 is connected to one end of the closing indicator light HD. The other end of the closing indicator light HD is connected to N.

[0036] The trip detection circuit in the above structure includes a trip monitoring relay TWJS and a first trip monitoring relay self-locking switch TWJS1. One end of the trip monitoring relay TWJS is connected to L, and the other end of the trip monitoring relay TWJS is connected to one end of the trip coil self-locking switch TQ1. The other end of the trip coil self-locking switch TQ1 is connected to N. One end of the first trip monitoring relay self-locking switch TWJS1 is connected to L, and the other end of the first trip monitoring relay self-locking switch TWJS1 is connected to one end of the trip indicator light TD. The other end of the trip indicator light TD is connected to N.

[0037] The open circuit monitoring circuit in the above structure includes a second closed position monitoring relay self-locking switch HWJS2, a second open position monitoring relay self-locking switch TWJS2, and an alarm signal device. One end of the second closed position monitoring relay self-locking switch HWJS2 is connected to the positive terminal +XM of the DC signal bus. The other end of the second closed position monitoring relay self-locking switch HWJS2 is connected to one end of the second open position monitoring relay self-locking switch TWJS2. The other end of the second open position monitoring relay self-locking switch TWJS2 is connected to one end of the alarm signal device, and the other end of the alarm signal device is connected to -XM.

[0038] In the above structure, when the closing holding relay HBJ is energized, the closing holding relay self-locking switch HBJ1 is closed; when the opening holding relay TBJ is energized, the first opening holding relay self-locking switch TBJ1 and the second opening holding relay self-locking switch TBJ2 are closed. When the anti-pumping relay FTJ is energized, the first anti-pumping relay self-locking switch FTJ1 is open, and the second anti-pumping relay self-locking switch FTJ2 is closed; when the closing position monitoring relay HWJS is energized, the first closing position monitoring relay self-locking switch HWJS1 is closed, and the second closing position monitoring relay self-locking switch HWJS2 is open; when the tripping position monitoring relay TWJS is energized, the first tripping position monitoring relay self-locking switch TWJS1 is closed, and the second tripping position monitoring relay self-locking switch TWJS2 is open.

[0039] As an optional configuration, the closing holding relay, opening holding relay, closing position monitoring relay, tripping position monitoring relay, and anti-pumping relay are all equipped with a rectifier bridge, with a resistor connected in series at the AC input terminal of the rectifier bridge. Specifically, the two ends of the coils of the closing holding relay, opening holding relay, closing position monitoring relay, tripping position monitoring relay, and anti-pumping relay are connected to the two ends of the DC output of the rectifier bridge. When the live wire and neutral wire provide AC current, the rectifier bridge converts the AC current into DC current and outputs it to the relay connected to the rectifier bridge. When the live wire and neutral wire provide DC current, the input and output of the rectifier bridge are both DC current. This rectifier bridge configuration allows the power system closing and tripping operation circuit of this application to be compatible with both AC and DC power systems.

[0040] In practice, Figure 1 The circuit within the dashed box is called the operating unit. When the operating unit is not in operation, the circuit between L and N is open. At this time, the self-locking switch HWJS2 of the second closed position monitoring relay and the self-locking switch TWJS2 of the second open position monitoring relay are closed, and an alarm signal is activated to remind the user that the power system is in a state of de-energization. Figure 2As shown, the principle of keeping the circuit breaker in the closed state is as follows: When the closing switch of the circuit breaker is closed, the closing circuit is conductive, and through the closure of the first closing holding relay switch, the closing circuit is connected to the live wire, forming a loop from the live wire, the closing circuit to the neutral wire. Thus, even if the closing switch is opened, the closing circuit remains conductive, keeping the circuit breaker in the closed state. Specifically, when the protection device controls the closing switch BYJn1 to close, the closing holding relay HBJ is energized, the closing holding relay self-locking switch HBJ1 is closed, the closing coil HQ is energized, the closing coil self-locking switch HQ1 is closed, the closing position monitoring relay HWJS is energized, the second closing position monitoring relay self-locking switch HWJS2 is opened, and the first closing position monitoring relay self-locking switch HWJS1 is closed. At this time, the alarm signal is turned off, and the closing indicator HD is lit. Because the closing holding relay self-locking switch HBJ1 is closed, the closing coil HQ will not be de-energized when the closing switch BYJn1 is opened, thus achieving the closing holding function. Figure 3 As shown, the principle of keeping the circuit breaker in the open state is as follows: When the circuit breaker's trip switch is closed, the trip circuit is conductive, causing the second trip holding relay switch to close, connecting the trip circuit to the live wire, forming a conductive loop from the live wire, the trip circuit, to the neutral wire. Thus, even if the trip switch is open, the trip circuit remains conductive, keeping the circuit breaker in the open state. Specifically, when the protection device controls the trip switch BYJn2 to close, the trip holding relay TBJ is energized, the second trip holding relay self-locking switch TBJ2 closes, the trip coil TQ is energized, the trip coil self-locking switch TQ1 closes, the trip position monitoring relay TWJS is energized, and the second trip position monitoring relay self-locking switch TWJS2 opens, triggering the first trip... When the position monitoring relay self-locking switch TWJS1 is closed, the alarm signal is turned off, and the trip indicator light TD illuminates. Because the second trip holding relay self-locking switch TBJ2 is closed, the trip coil TQ will not be de-energized when the trip switch BYJn2 is open, thus achieving the trip holding function. When the first trip holding relay self-locking switch TBJ1 is closed, the anti-pump relay FJ is energized, and the first anti-pump relay self-locking switch FTJ1 is opened. This disconnects the closing circuit, de-energizing the closing holding relay HBJ and the closing coil HQ. The closing holding relay self-locking switch HBJ1 and the closing coil HQ are also disconnected. Because the closing holding relay self-locking switch HBJ1 is open, the anti-pump relay FTJ is de-energized and resets. Figure 4 As shown, the principle of preventing repeated tripping and closing of the circuit breaker is as follows: When the tripping switch is closed, the tripping circuit is connected, and the anti-pumping circuit is also connected. The closing circuit is disconnected through the self-locking switch of the anti-pumping relay. Specifically, in the tripping state, the self-locking switch TBJ1 of the first tripping holding relay is closed. If the closing switch BYJn1 is closed at this time, the closing circuit is connected, and the anti-pumping circuit is connected at the same time, triggering the anti-pumping relay FTJ to close. At this time, the self-locking switch FTJ1 of the first anti-pumping relay is disconnected, and the closing circuit is disconnected.

[0041] As can be seen from the structure and implementation process of the power system circuit breaker's opening and closing operation circuit, it can realize both the opening and closing holding functions of the circuit breaker. Furthermore, by setting up an anti-pumping circuit, the closing circuit is disconnected when the circuit breaker is in the open state and the closing circuit is conducting, preventing the circuit breaker from repeatedly opening and closing. The closing detection circuit can detect the circuit breaker's closing state, and the opening detection circuit can detect the circuit breaker's opening state, facilitating users to obtain the status of the circuit breaker and the energization status of the power system. Equipping each relay with a rectifier bridge ensures that the power system circuit breaker's opening and closing operation circuit is compatible with both DC and AC power systems.

[0042] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A circuit for opening and closing switches in a power system, characterized in that, It includes at least: a closing circuit, a tripping circuit, and an anti-pumping circuit; the anti-pumping circuit and the closing circuit are both connected to the closing switch of the circuit breaker; the tripping circuit is connected to the tripping switch of the circuit breaker. The closing circuit is used to keep the circuit breaker in the closed state when the closing switch is closed; The tripping circuit is used to keep the circuit breaker in the tripped state when the tripping switch is closed; The anti-pumping circuit includes at least an anti-pumping relay and a first trip holding relay self-locking switch. The first trip holding relay self-locking switch is used to activate the anti-pumping circuit when the circuit breaker is in the tripped state and the closing circuit is open, and the anti-pumping relay is energized to disconnect the closing circuit.

2. The power system opening and closing operation circuit according to claim 1, characterized in that, The closing circuit includes a closing holding relay, a closing holding relay self-locking switch, and a first anti-pumping relay self-locking switch. One end of the closing holding relay is connected to one end of the closing holding relay self-locking switch and one end of the closing switch. The other end of the closing switch is connected to the live wire. The other end of the closing holding relay self-locking switch is connected to the live wire. The other end of the closing holding relay is connected to one end of the first anti-pumping relay self-locking switch. The other end of the first anti-pumping relay self-locking switch is connected to one end of the closing coil. The other end of the closing coil is connected to the neutral wire. One end of the anti-pumping relay is connected to one end of the closing switch and one end of the closing holding relay self-locking switch. The other end of the anti-pumping relay is connected to one end of the first opening holding relay self-locking switch. The other end of the first opening holding relay self-locking switch is connected to the neutral wire.

3. The power system switching operation circuit according to claim 1, characterized in that, The tripping circuit includes a tripping holding relay and a second tripping holding relay self-locking switch. One end of the tripping holding relay is connected to one end of the second tripping holding relay self-locking switch and one end of the tripping switch. The other end of the second tripping holding relay self-locking switch and the other end of the tripping switch are connected to the live wire. The other end of the tripping holding relay is connected to one end of the tripping coil, and the other end of the tripping coil is connected to the neutral wire.

4. The power system opening and closing operation circuit according to claim 1, characterized in that, The anti-pumping circuit also includes a second anti-pumping relay self-locking switch, which is connected in parallel with the first trip holding relay self-locking switch.

5. The power system switching operation circuit according to claim 1, characterized in that, The power system opening and closing operation circuit also includes a closing detection circuit, which includes a closing position monitoring relay and a first closing position monitoring relay self-locking switch. One end of the closing position monitoring relay is connected to the live wire, and the other end of the closing position monitoring relay is connected to one end of the closing coil self-locking switch. The other end of the closing coil self-locking switch is connected to the neutral wire. One end of the first closing position monitoring relay self-locking switch is connected to the live wire, and the other end of the first closing position monitoring relay self-locking switch is connected to one end of the closing indicator light. The other end of the closing indicator light is connected to the neutral wire.

6. The power system opening and closing operation circuit according to claim 5, characterized in that, The power system circuit for opening and closing operations also includes a circuit breaker detection circuit. The circuit breaker detection circuit includes a trip position monitoring relay and a first trip position monitoring relay self-locking switch. One end of the trip position monitoring relay is connected to the live wire, and the other end of the trip position monitoring relay is connected to one end of the circuit breaker coil self-locking switch. The other end of the circuit breaker coil self-locking switch is connected to the neutral wire. One end of the first trip position monitoring relay self-locking switch is connected to the live wire, and the other end of the first trip position monitoring relay self-locking switch is connected to one end of the circuit breaker indicator light. The other end of the circuit breaker indicator light is connected to the neutral wire.

7. The power system opening and closing operation circuit according to claim 1, characterized in that, The closing holding relay, opening holding relay, closing position monitoring relay, tripping position monitoring relay, and anti-pumping relay are all equipped with a rectifier bridge, and a resistor is connected in series at the AC input terminal of the rectifier bridge.

8. The power system opening and closing operation circuit according to claim 1, characterized in that, The power system opening and closing operation circuit also includes a line break monitoring circuit. The line break monitoring circuit includes a second closing position monitoring relay self-locking switch and a second tripping position monitoring relay self-locking switch. One end of the second closing position monitoring relay self-locking switch is connected to the positive terminal of the DC signal bus. The other end of the second closing position monitoring relay self-locking switch is connected to one end of the second tripping position monitoring relay self-locking switch. The other end of the second tripping position monitoring relay self-locking switch is connected to one end of an alarm signal device. The other end of the alarm signal device is connected to the negative terminal of the DC signal bus.

9. The power system switching operation circuit according to claim 1, characterized in that, When the closing holding relay is energized, the closing holding relay self-locking switch is closed; when the opening holding relay is energized, the first opening holding relay self-locking switch and the second opening holding relay self-locking switch are closed.

10. The power system opening and closing operation circuit according to claim 1, characterized in that, When the anti-bounce relay is activated, the first anti-bounce relay self-locking switch is disconnected, and the second anti-bounce relay self-locking switch is closed. When the closed position monitoring relay is energized, the self-locking switch of the first closed position monitoring relay is closed, and the self-locking switch of the second closed position monitoring relay is opened. When the trip monitoring relay is energized, the self-locking switch of the first trip monitoring relay is closed, and the self-locking switch of the second trip monitoring relay is opened.

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