Protection starting locking closing circuit for power supply system
By introducing a protective start-stop-closing circuit into the power supply system, and using the normally closed and normally open contacts of the intermediate relay to control the circuit breaker, the problem of voltage oscillation and surge caused by operational errors was solved, and the stable operation of the power supply system was achieved.
Patent Information
- Application Number
- CN202520046745.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-01-08
AI Technical Summary
In power supply systems, a circuit breaker trips instantaneously after being closed due to operator error, causing voltage oscillations and surges.
Design a protection start-lock closing circuit, including an air switch, a transfer switch, a high-voltage switchgear protection device, a circuit breaker, an intermediate relay, a closing coil, and a tripping coil. By controlling the normally closed and normally open contacts of the intermediate relay, ensure that the circuit breaker cannot be closed when the protection action has not been reset, thus avoiding voltage oscillations and surges.
It effectively avoids circuit breaker tripping after closing due to operational errors, prevents voltage oscillations and surges in the power supply system, and ensures circuit safety and stability through the status control of intermediate relays.
Smart Images
Figure CN223928085U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power supply system technology, and in particular to a protective start-up lockout closing circuit for a power supply system. Background Technology
[0002] Circuit breakers are an indispensable component of power supply systems. They can not only connect and disconnect no-load and load currents in high-voltage circuits normally, but also work with high-voltage switchgear protection devices and monitoring and control devices to quickly cut off fault currents and prevent accidents from escalating when system faults occur, thereby ensuring the safe operation of the entire power supply system.
[0003] Whenever a protection mechanism trips in the power supply system, the two terminals inside the high-voltage switchgear protection device used to control the tripping coil become conductive, energizing the tripping coil and tripping the circuit breaker. Normally, the circuit breaker can only be closed after the high-voltage switchgear protection device has been reset. However, if, due to negligence, a reset is not performed and the circuit breaker is closed directly, the closing coil is instantly energized, the circuit breaker closes, and its normally open contacts close instantly. Because the two terminals inside the high-voltage switchgear protection device remain conductive without being reset, the tripping coil is energized again, causing the circuit breaker to trip immediately. This can cause voltage oscillations in the power supply system and generate a certain impact on the system. Summary of the Invention
[0004] The purpose of this application is to provide a protective start-up lockout closing circuit for a power supply system, which avoids voltage oscillations and shocks to the power supply system caused by operator error.
[0005] To achieve the above objectives, this application provides the following solution:
[0006] This application provides a protective start-locking closing circuit for a power supply system, the protective start-locking closing circuit for a power supply system includes: an air switch, a first transfer switch, a second transfer switch, a high-voltage switchgear protection device, a circuit breaker, an intermediate relay, a closing coil, a tripping coil, and a first connecting pressure plate;
[0007] The first and third terminals of the air switch are connected to the busbar; the second terminal of the air switch is connected to the first terminal of the high-voltage switchgear protection device, the first terminal of the first transfer switch, the third terminal of the first transfer switch, and one end of the normally open contact of the intermediate relay; the fifth terminal of the high-voltage switchgear protection device is connected to one end of the first normally closed contact of the circuit breaker.
[0008] The second terminal of the first changeover switch is connected to the first and third terminals of the second changeover switch, respectively; the second terminal of the second changeover switch is connected to the second terminal of the high-voltage switchgear protection device; the sixth terminal of the high-voltage switchgear protection device is connected to one end of the first normally closed contact of the intermediate relay; the other end of the first normally closed contact of the intermediate relay is connected to one end of the second normally closed contact of the circuit breaker; the other end of the second normally closed contact of the circuit breaker is connected to one end of the closing coil; the other end of the closing coil is connected to one end of the second normally closed contact of the intermediate relay.
[0009] The fourth terminal of the second changeover switch is connected to the third terminal of the high-voltage switchgear protection device; the seventh terminal of the high-voltage switchgear protection device is connected to one end of the normally open contact of the circuit breaker and the eighth terminal of the high-voltage switchgear protection device; the other end of the normally open contact of the circuit breaker is connected to one end of the trip coil; the eighth terminal of the high-voltage switchgear protection device is connected to one end of the coil of the intermediate relay through the first connecting pressure plate; the fourth terminal of the air switch is connected to the other end of the second normally closed contact of the intermediate relay, the other end of the trip coil, and the other end of the coil of the intermediate relay; the circuit breaker as a whole is connected to the power supply system.
[0010] According to the specific embodiments provided in this application, the following technical effects are disclosed:
[0011] When the power supply system's protection system activates, the fourth and eighth terminals of the high-voltage switchgear protection device will conduct, energizing the coil of the intermediate relay and causing the first and second normally closed contacts of the intermediate relay to open. Since the protection action necessarily occurs when the circuit breaker is closed and a circuit fault occurs, when the fourth and eighth terminals of the high-voltage switchgear protection device are conducting, the normally open contacts of the circuit breaker will necessarily be closed, energizing the tripping coil and causing the circuit breaker to trip. Therefore, unless the high-voltage switchgear protection device is reset, the fourth and eighth terminals will remain conducting, and the first and second normally closed contacts of the intermediate relay will remain open. The circuit breaker's closing circuit cannot conduct, and the circuit breaker cannot close, thus avoiding voltage oscillations and surges in the power supply system caused by the circuit breaker closing and then instantly tripping. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a circuit diagram for protection, start-up, lockout, and closing of a power supply system, provided as an embodiment of this application.
[0014] Symbol explanation:
[0015] Air switch—ZK, First changeover switch—SA1, Second changeover switch—SA2, High-voltage switchgear protection device—1F, Measurement and control device—1N, First normally closed contact of circuit breaker—QF-NC1, Second normally closed contact of circuit breaker—QF-NC2, Normally open contact of circuit breaker—QF-NO, First normally closed contact of intermediate relay—KA-NC1, Second normally closed contact of intermediate relay—KA-NC2, Normally open contact of intermediate relay—KA-NO, Coil of intermediate relay—KA, Closing coil—XF, Opening coil—YR, First connecting plate—LP1, Second connecting plate—LP2, Third connecting plate—LP3, Fourth connecting plate—LP4, First indicator light—L1, Second indicator light—L2, Emergency stop button—SB. Detailed Implementation
[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0017] The purpose of this application is to provide a protective start-up lockout closing circuit for a power supply system, which avoids voltage oscillations and shocks to the power supply system caused by operator error.
[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] like Figure 1As shown, this embodiment provides a protection start-locking closing circuit for a power supply system. The protection start-locking closing circuit for a power supply system includes: an air switch ZK, a first transfer switch SA1, a second transfer switch SA2, a high-voltage switchgear protection device 1F, a circuit breaker, an intermediate relay, a closing coil XF, a tripping coil YR, and a first connecting pressure plate LP1.
[0020] Among them, the first and third terminals of the air switch ZK are connected to the busbar; the second terminal of the air switch ZK is connected to the first terminal of the high-voltage switchgear protection device 1F, the first terminal of the first changeover switch SA1, the third terminal of the first changeover switch SA1, and one end of the normally open contact KA-NO of the intermediate relay; the fifth terminal of the high-voltage switchgear protection device 1F is connected to one end of the first normally closed contact QF-NC1 of the circuit breaker.
[0021] The second terminal of the first changeover switch SA1 is connected to the first and third terminals of the second changeover switch SA2, respectively; the second terminal of the second changeover switch SA2 is connected to the second terminal of the high-voltage switchgear protection device 1F; the sixth terminal of the high-voltage switchgear protection device 1F is connected to one end of the first normally closed contact KA-NC1 of the intermediate relay; the other end of the first normally closed contact KA-NC1 of the intermediate relay is connected to one end of the second normally closed contact QF-NC2 of the circuit breaker; the other end of the second normally closed contact QF-NC2 of the circuit breaker is connected to one end of the closing coil XF; the other end of the closing coil XF is connected to one end of the second normally closed contact KA-NC2 of the intermediate relay.
[0022] The fourth terminal of the second changeover switch SA2 is connected to the third terminal of the high-voltage switchgear protection device 1F; the seventh terminal of the high-voltage switchgear protection device 1F is connected to one end of the normally open contact QF-NO of the circuit breaker and the eighth terminal of the high-voltage switchgear protection device 1F respectively; the other end of the normally open contact QF-NO of the circuit breaker is connected to one end of the trip coil YR; the eighth terminal of the high-voltage switchgear protection device 1F is connected to one end of the coil KA of the intermediate relay through the first connecting pressure plate LP1; the fourth terminal of the air switch ZK is connected to the other end of the second normally closed contact KA-NC2 of the intermediate relay, the other end of the trip coil YR, and the other end of the coil KA of the intermediate relay respectively; the circuit breaker as a whole is connected to the power supply system.
[0023] Preferably, the first changeover switch SA1 is used to switch between the local control mode and the remote control mode of the circuit breaker. Rotating the first changeover switch SA1 45 degrees to the left connects the first and second terminals of the first changeover switch SA1, thus entering the local control mode of the circuit breaker; rotating the first changeover switch SA1 45 degrees to the right connects the third and fourth terminals of the first changeover switch SA1, thus entering the remote control mode of the circuit breaker.
[0024] Preferably, the second changeover switch SA2 is used to control the closing or opening of the circuit breaker in local control mode. When the second changeover switch SA2 is rotated 45 degrees to the left, the first and second terminals of the second changeover switch SA2 are connected, at which point the circuit breaker will be closed; when the second changeover switch SA2 is rotated 45 degrees to the right, the third and fourth terminals of the second changeover switch SA2 are connected, at which point the circuit breaker will be opened.
[0025] Preferably, the first and fifth terminals of the high-voltage switchgear protection device 1F are internally connected; the second and sixth terminals of the high-voltage switchgear protection device 1F are internally connected; the third and seventh terminals of the high-voltage switchgear protection device 1F are internally connected; the fourth and eighth terminals of the high-voltage switchgear protection device 1F are only connected after a protection action signal is detected, and are automatically disconnected after the protection action signal is reset.
[0026] Preferably, the power supply system in this embodiment is a 10KV power supply system.
[0027] Preferably, the high-voltage switchgear protection device 1F is model PS 640UX.
[0028] Furthermore, the aforementioned protection start-up interlocking closing circuit for the power supply system also includes: a measurement and control device 1N, a second connecting pressure plate LP2, a third connecting pressure plate LP3, and a fourth connecting pressure plate LP4; the first and second terminals of the measurement and control device 1N are respectively connected to the fourth terminal of the first changeover switch SA1; the third terminal of the measurement and control device 1N is connected to the second terminal of the air switch ZK; the fourth terminal of the measurement and control device 1N is connected to the second terminal of the high-voltage switchgear protection device 1F via the second connecting pressure plate LP2; the fifth terminal of the measurement and control device 1N is connected to the third terminal of the high-voltage switchgear protection device 1F via the third connecting pressure plate LP3; and the sixth terminal of the measurement and control device 1N is connected to the fourth terminal of the high-voltage switchgear protection device 1F via the fourth connecting pressure plate LP4.
[0029] Preferably, the monitoring and control device 1N is used to control the closing or opening of the circuit breaker in remote control mode. The third and sixth terminals of the monitoring and control device 1N are always in a conductive state, while the first, second, third, and fourth terminals of the monitoring and control device 1N are normally open and require operation and control via a host computer in the main control room. When the closing operation is initiated via the host computer, the first and fourth terminals of the monitoring and control device 1N are connected, the closing coil XF is energized, and the circuit breaker closes (i.e., the normally open contact QF-NO of the circuit breaker closes, and the first normally closed contact QF-NC1 and the second normally closed contact QF-NC2 of the circuit breaker open). When the opening operation is initiated via the host computer, the second and fifth terminals of the monitoring and control device 1N are connected, the opening coil YR is de-energized, and the circuit breaker opens (i.e., the normally open contact QF-NO of the circuit breaker opens, and the first normally closed contact QF-NC1 and the second normally closed contact QF-NC2 of the circuit breaker close).
[0030] Preferably, the first connecting plate LP1, the second connecting plate LP2, the third connecting plate LP3, the fourth connecting plate LP4, and the fifth connecting plate LP5 all have two fastening bolts at both ends, which are mainly used for manually connecting and disconnecting the circuit.
[0031] Preferably, the model of the measurement and control device 1N is PMC-751X.
[0032] Furthermore, the aforementioned protection start-up lockout closing circuit for a kilovolt power supply system also includes: a first indicator light L1 and a second indicator light L2; one end of the first indicator light L1 is connected to the other end of the normally open contact KA-NO of the intermediate relay; the other end of the first indicator light L1 is connected to the fourth terminal of the air switch ZK; one end of the second indicator light L2 is connected to the other end of the first normally closed contact QF-NC1 of the circuit breaker; the other end of the second indicator light L2 is connected to the fourth terminal of the air switch ZK.
[0033] Preferably, when the operator forgets to reset the protection action signal, the fourth and eighth terminals of the high-voltage switchgear protection device 1F will remain in the connected state, the intermediate relay will be energized, the normally open contact KA-NO of the intermediate relay will close, the circuit containing the first indicator light L1 will be connected, the first indicator light L1 will light up and display red, reminding the operator that a reset operation is required.
[0034] Preferably, when the circuit breaker is in the open state, the first normally closed contact QF-NC1 of the circuit breaker is closed, the circuit containing the second indicator L2 is connected, the second indicator L2 lights up and displays green, and the circuit is in a safe state.
[0035] Furthermore, the aforementioned protection start-up interlocking closing circuit for the power supply system also includes: an emergency stop button SB; one end of the emergency stop button SB is connected to the second terminal of the air switch ZK; the other end of the emergency stop button SB is connected to the eighth terminal of the high-voltage switchgear protection device 1F; the emergency stop button SB is used for tripping operation in emergency situations.
[0036] Furthermore, the working principle of the aforementioned protection start-up lockout closing circuit for power supply systems is as follows:
[0037] When the air switch ZK is closed, the circuit is energized.
[0038] Rotate the first changeover switch SA1 to the local control mode, connecting the first and second terminals of the first changeover switch SA1. Then rotate the second changeover switch SA2 to the closed position, connecting the first and second terminals of the second changeover switch SA2, energizing the closing coil XF, and closing the circuit breaker. Rotate the second changeover switch SA2 to the open position, connecting the third and fourth terminals of the second changeover switch SA2, energizing the opening coil YR, and opening the circuit breaker.
[0039] Rotate the first changeover switch SA1 to remote control mode. The third and fourth terminals of the first changeover switch SA1 are connected. At this time, click the closing operation on the host computer in the main control room. The first and fourth terminals of the measurement and control device 1N are connected, the closing coil XF is energized, and the circuit breaker closes. When the opening operation is clicked, the second and fifth terminals of the measurement and control device 1N are connected, the opening coil YR is energized, and the circuit breaker opens.
[0040] When a protection action signal is detected, the fourth and eighth terminals of the high-voltage switchgear protection device 1F are connected. Since the third and sixth terminals of the measurement and control device 1N are already connected, the trip coil YR is energized, and the circuit breaker trips.
[0041] If the protection action signal is not reset after the circuit breaker trips, the fourth and eighth terminals of the high-voltage switchgear protection device 1F will remain connected. However, since the circuit breaker has already tripped, the normally open contact QF-NO of the circuit breaker will be disconnected to prevent the trip coil YR from burning out due to prolonged energization.
[0042] In summary, the advantages of the aforementioned protection start-up and interlocking closing circuit for power supply systems are that the intermediate relay remains energized until the protection action signal is reset. The first and second normally closed contacts of the intermediate relay on both sides of the closing coil remain open, preventing the closing circuit from being energized and the circuit breaker from closing, thus avoiding any impact on the power supply system. Furthermore, the normally open contact of the intermediate relay remains closed, and the first indicator light remains red, prompting on-site personnel to perform a timely reset operation.
[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0044] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A protective closing circuit for a power supply system, characterized in that, The protection starting locking closing circuit for the power supply system comprises an air switch, a first conversion switch, a second conversion switch, a high-voltage switch cabinet protection device, a circuit breaker, an intermediate relay, a closing coil, an opening coil and a first connecting press plate. The first terminal and the third terminal of the air switch are connected with a bus; the second terminal of the air switch is connected with the first terminal of the high-voltage switch cabinet protection device, the first terminal of the first conversion switch, the third terminal of the first conversion switch and one end of the normally open contact of the intermediate relay respectively; the fifth terminal of the high-voltage switch cabinet protection device is connected with one end of the first normally closed contact of the circuit breaker. The second terminal of the first conversion switch is connected with the first terminal and the third terminal of the second conversion switch respectively; the second terminal of the second conversion switch is connected with the second terminal of the high-voltage switch cabinet protection device; the sixth terminal of the high-voltage switch cabinet protection device is connected with one end of the first normally closed contact of the intermediate relay; the other end of the first normally closed contact of the intermediate relay is connected with one end of the second normally closed contact of the circuit breaker; the other end of the second normally closed contact of the circuit breaker is connected with one end of the closing coil; the other end of the closing coil is connected with one end of the second normally closed contact of the intermediate relay. The fourth terminal of the second conversion switch is connected with the third terminal of the high-voltage switch cabinet protection device; the seventh terminal of the high-voltage switch cabinet protection device is connected with one end of the normally open contact of the circuit breaker and the eighth terminal of the high-voltage switch cabinet protection device respectively; the other end of the normally open contact of the circuit breaker is connected with one end of the opening coil; the eighth terminal of the high-voltage switch cabinet protection device is connected with one end of the coil of the intermediate relay through the first connecting press plate; the fourth terminal of the air switch is connected with the other end of the second normally closed contact of the intermediate relay, the other end of the opening coil and the other end of the coil of the intermediate relay respectively; the circuit breaker as a whole is connected with a power supply system.
2. A protective closing and closing circuit for a power supply system according to claim 1, characterized in that, The first conversion switch is used for switching the local control mode and the remote control mode of the circuit breaker.
3. A protective closing and closing circuit for power supply systems according to claim 2, characterized in that, The second conversion switch is used for controlling the closing or opening of the circuit breaker in the local control mode.
4. The protective closing and closing circuit for power supply system according to claim 2, characterized in that, The protection starting locking closing circuit for the power supply system further comprises a measurement and control device, a second connecting press plate, a third connecting press plate and a fourth connecting press plate. The first terminal and the second terminal of the measurement and control device are connected with the fourth terminal of the first conversion switch respectively; the third terminal of the measurement and control device is connected with the second terminal of the air switch; the fourth terminal of the measurement and control device is connected with the second terminal of the high-voltage switch cabinet protection device through the second connecting press plate; the fifth terminal of the measurement and control device is connected with the third terminal of the high-voltage switch cabinet protection device through the third connecting press plate; the sixth terminal of the measurement and control device is connected with the fourth terminal of the high-voltage switch cabinet protection device through the fourth connecting press plate.
5. The protective closing and closing circuit for power supply system according to claim 4, characterized in that, The measurement and control device is used for controlling the closing or opening of the circuit breaker in the remote control mode.
6. The protective closing and closing circuit for power supply system according to claim 4, characterized in that, The third terminal and the sixth terminal of the measurement and control device are internally conductive.
7. The protective closing and closing circuit for power supply system according to claim 1, characterized in that, The first terminal and the fifth terminal of the high-voltage switch cabinet protection device are internally conductive; the second terminal and the sixth terminal of the high-voltage switch cabinet protection device are internally conductive; and the third terminal and the seventh terminal of the high-voltage switch cabinet protection device are internally conductive.
8. The protective closing and closing circuit for power supply system according to claim 1, characterized in that, The protection starting locking closing circuit for a kilovolt power supply system further comprises a first indicator lamp. One end of the first indicator lamp is connected with the other end of the normally open contact of the intermediate relay, and the other end of the first indicator lamp is connected with the fourth terminal of the air switch.
9. The protective closing and closing circuit for power supply system according to claim 1, characterized in that, The protection starting locking closing circuit for a power supply system further comprises a second indicator lamp. One end of the second indicator lamp is connected with the other end of the first normally closed contact of the circuit breaker, and the other end of the second indicator lamp is connected with the fourth terminal of the air switch.
10. The protective closing and closing circuit for power supply system according to claim 1, characterized in that, The protection starting locking closing circuit for a power supply system further comprises an emergency stop button. One end of the emergency stop button is connected with the second terminal of the air switch, and the other end of the emergency stop button is connected with the eighth terminal of the high-voltage switch cabinet protection device.