Anti-tripping circuit of 10KV high-voltage vacuum circuit breaker

Abstract

The utility model discloses an anti-tripping circuit of a 10KV high-voltage vacuum circuit breaker, which relates to the technical field of power system protection control and mainly comprises a closing loop, an opening loop, an anti-tripping loop and a tripping position monitoring loop. The device comprises circuit elements including an opening and closing button (SA), an auxiliary switch (DL), a travel switch (CK), an anti-tripping relay (KA), an opening coil (TQ), a closing coil (HQ), a direct-current power supply (KM) and a terminal strip (XT). According to the utility model, the circuit breaker is prevented from unnecessary repeated tripping under the condition that a fault is not completely eliminated or under some conditions, equipment is protected, sufficient time is provided for fault positioning and processing, and the stability and safety of a system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power system protection control, and specifically relates to a 10KV high-voltage vacuum circuit breaker anti-jump circuit. Background Art

[0002] The 10kV pole-mounted circuit breaker is an indispensable part of the power system and plays a crucial role in ensuring the safety of the power grid, improving the power supply quality, and maintaining the stability of the system. When the high-voltage circuit breaker is in the closing state, if it closes on a faulty line or equipment, and at this time, if the closing control loop adheres, after the relay protection device trips the high-voltage circuit breaker, the circuit breaker will re-close and re-trip multiple times, that is, the "circuit breaker jumping" phenomenon. Once the circuit breaker jumping fault occurs, it will cause damage to the high-voltage circuit breaker, and even explosion accidents may occur, endangering the stable operation of the entire power system. Summary of the Invention

[0003] To solve the above-mentioned existing technical problems, the utility model provides a 10KV high-voltage vacuum circuit breaker anti-jump circuit, which can prevent the circuit breaker from tripping repeatedly unnecessarily when the fault is not completely cleared or in some cases, protect the equipment, provide sufficient time for fault location and handling, and improve the stability and safety of the system.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A 10KV high-voltage vacuum circuit breaker anti-jump circuit mainly consists of a closing circuit, a tripping circuit, an anti-jump circuit, and a trip position monitoring circuit, and the circuit components included are closing and tripping buttons, several auxiliary switches, a travel switch, several anti-jump relays, a tripping coil, a closing coil, a DC power supply, and a terminal block. The closing circuit and the tripping circuit are connected in parallel and are used to remotely control the closing and tripping operations of the circuit breaker. The trip position monitoring circuit is arranged at the left end of the closing circuit. The anti-jump circuit is connected in parallel with the closing circuit and the tripping circuit. The anti-jump circuit is set to prevent the circuit breaker from jumping when the closing button adheres. The trip position monitoring circuit is set to control the action of the anti-jump circuit when the anti-jump relay is started in the tripped state.

[0006] The closing circuit is set as follows: The first set of normally open contacts ① of the closing and tripping button is connected to the positive pole of the DC power supply, and the normally open contacts ② are connected to the normally closed contacts ⑤ of one end of the first anti-jump relay. The normally closed contacts ① of the other end of the anti-jump relay are connected to the normally open contacts ⑦ of one end of the travel switch. The normally open contacts ⑧ of the other end of the travel switch are connected to the normally closed contacts ① of one end of the auxiliary switch. The normally open contacts ③ of the other end of the auxiliary switch are connected to the contact ① of one end of the closing coil. The contact ② of the other end of the closing coil is connected to the negative pole of the DC power supply.

[0007] The opening circuit is set as follows: The second set of normally open contacts ③ of the opening and closing button is connected to the positive pole of the DC power supply, and the normally open contacts ④ are connected to the normally open contacts ⑥ at one end of the auxiliary switch. The normally open contacts ⑧ at the other end of the auxiliary switch are connected to the contact ① at one end of the opening coil, and the contact ② at the other end of the opening coil is connected to the negative pole of the DC power supply.

[0008] The tripped position monitoring circuit is set as follows: One end of the terminal block is connected to the normally open contacts ⑬ at one end of the auxiliary switch, and the normally open contacts ⑮ at the other end of the auxiliary switch are connected to the normally closed contacts ② at one end of the anti-pumping relay. The normally closed contacts ⑥ at the other end of the anti-pumping relay are connected to the other end of the terminal block.

[0009] The anti-pumping circuit is set as follows: The first set of normally open contacts ② of the opening and closing button is connected to the main circuit contacts ⑦ at one end of the anti-pumping relay. The main circuit contacts ⑧ at the other end of the anti-pumping relay are respectively connected to the normally open contacts ⑭ at one end of the auxiliary switch and the normally open contacts ③ at one end of the anti-pumping relay. The normally open contacts ⑯ at the other end of the auxiliary switch and the normally open contacts ⑤ at the other end of the anti-pumping relay are respectively connected to the negative pole of the DC power supply.

[0010] The utility model has the following beneficial effects:

[0011] 1) It can effectively reduce unnecessary repeated tripping operations, extend the service life of the equipment, and protect the equipment from damage;

[0012] 2) The designed anti-pumping circuit can ensure that after a fault occurs, the circuit breaker will not operate frequently due to misoperation or malfunction of the automatic reclosing system, improving the stability and reliability of the power system;

[0013] 3) The designed tripped position monitoring circuit enables maintenance personnel to have sufficient time for fault location and handling after tripping, avoiding interference with fault troubleshooting due to repeated operations of the circuit breaker;

[0014] 4) The anti-pumping circuit can prevent arcs and current surges caused by frequent tripping, reduce the safety risks during the operation of the power system, protect the personal safety of maintenance personnel, and improve the overall safety of the equipment. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Figure 2 is a secondary wiring diagram of the anti-pumping relay;

[0017] Figure 3 is a secondary wiring diagram of the auxiliary switch. Detailed Embodiment

[0018] The following describes the utility model in detail with reference to the drawings and specific embodiments:

[0019] As shown Figures 1 - 3 in the figure, the anti - bounce circuit of this 10KV high - voltage vacuum circuit breaker mainly consists of a closing circuit, a tripping circuit, an anti - bounce circuit and a position - monitoring circuit for tripping. The circuit elements included are closing and tripping buttons SA, auxiliary switch DL, travel switch CK, several anti - bounce relays KA, tripping coil TQ, closing coil HQ, DC power supply KM and terminal block XT. The closing circuit and the tripping circuit are connected in parallel to remotely control the closing and tripping operations of the circuit breaker. The position - monitoring circuit for tripping is set at the left end of the closing circuit. The anti - bounce circuit is connected in parallel with the closing circuit and the tripping circuit. The anti - bounce circuit is set to prevent the circuit breaker from bouncing when the closing button is stuck. The position - monitoring circuit for tripping is set to control the action of the anti - bounce circuit when the anti - bounce relay is activated in the tripping state.

[0020] As a preferred method, in this embodiment, the closing circuit is set as follows: The first set of normally - open contacts ① of the closing and tripping button SA is connected to the positive pole of the DC power supply KM, and the normally - open contacts ② are connected to the normally - closed contacts ⑤ at one end of the anti - bounce relay KA. The normally - closed contacts ① at the other end of the anti - bounce relay KA are connected to the normally - open contacts ⑦ at one end of the travel switch CK. The normally - open contacts ⑧ at the other end of the travel switch CK are connected to the normally - closed contacts ① at one end of the auxiliary switch DL. The normally - open contacts ③ at the other end of the auxiliary switch DL are connected to the contact ① at one end of the closing coil HQ. The contact ② at the other end of the closing coil HQ is connected to the negative pole of the DC power supply KM.

[0021] As a preferred method, in this embodiment, the tripping circuit is set as follows: The second set of normally - open contacts ③ of the closing and tripping button SA is connected to the positive pole of the DC power supply KM, and the normally - open contacts ④ are connected to the normally - open contacts ⑥ at one end of the auxiliary switch DL. The normally - open contacts ⑧ at the other end of the auxiliary switch DL are connected to the contact ① at one end of the tripping coil TQ. The contact ② at the other end of the tripping coil TQ is connected to the negative pole of the DC power supply KM.

[0022] As a preferred method, in this embodiment, the position - monitoring circuit for tripping is set as follows: One end XT - 1 of the terminal block XT is connected to the normally - open contacts ⑬ at one end of the auxiliary switch DL. The normally - open contacts ⑮ at the other end of the auxiliary switch DL are connected to the normally - closed contacts ② at one end of the anti - bounce relay KA. The normally - closed contacts ⑥ at the other end of the anti - bounce relay KA are connected to the other end XT - 2 of the terminal block XT.

[0023] As a preferred embodiment, in this embodiment, the anti - bounce circuit is set as follows: The first set of normally - open contacts ② of the closing - opening button SA is connected to the main - circuit contact ⑦ at one end of the anti - bounce relay KA. The main - circuit contact ⑧ at the other end of the anti - bounce relay KA is respectively connected to the normally - open contact ⑭ at one end of the auxiliary switch DL and the normally - open contact ③ at one end of the anti - bounce relay KA. The normally - open contact ⑯ at the other end of the auxiliary switch DL and the normally - open contact ⑤ at the other end of the anti - bounce relay KA are respectively connected to the negative pole of the DC power supply KM.

[0024] In this embodiment, the anti - bounce relay KA is an intermediate relay, with a rated current of 10 A, a rated voltage of DC24V, an electrical life of 100,000 times, 8 - pin contacts, and a contact form of two normally - open and two normally - closed; the contact form of the auxiliary switch DL is five normally - open and five normally - closed. When rotating, normally - open turns to normally - closed, and normally - closed turns to normally - open.

[0025] The voltage of the DC power supply KM is generally 24V or 220V, which is matched with the DC motor and the closing - opening coil during use. Here, DC24V is selected. The closing - opening coil SA has a rated voltage of DC24V and a resistance of 1.8Ω ± 5% (20℃).

[0026] Under normal working conditions, after the controller detects the open state of the circuit breaker, it starts energy storage. After the energy storage is completed, the normally - open contacts ⑦ and ⑧ of the travel switch CK are closed. The closing - opening button SA is turned to the closing position. At this time, the closing circuit is turned on, and the closing coil HQ is energized, and the circuit breaker closes. The normally - closed contacts ① and ③ of the auxiliary switch DL are opened, cutting off the closing circuit. At this time, if the controller detects an over - current fault in the line and issues a tripping pulse signal, the normally - open contacts ⑥ and ⑧ of the auxiliary switch DL are closed, and the tripping coil TQ is energized, and the circuit breaker trips. If the closing relay of the controller is stuck, the closing pulse will always exist. The main - circuit contacts ⑦ and ⑧ of the anti - bounce relay KA are energized, and the normally - open contacts ③ and ⑤ of the anti - bounce relay KA are closed. The anti - bounce relay KA self - holds. At this time, the normally - closed contacts ① and ⑤ of the anti - bounce relay KA connected in series in the closing circuit are opened, and the closing circuit is disconnected. In this way, the anti - bounce relay KA plays a protective role and cuts off the closing circuit. When the anti - bounce relay KA is started, in the open state, the normally - closed contacts ② and ⑥ of the anti - bounce relay KA in the trip - position monitoring circuit are opened, and the circuit is not turned on, reminding the background that the anti - bounce circuit has operated and allowing maintenance personnel to conduct problem troubleshooting, which is convenient for maintenance.

[0027] In summary, the anti - bounce circuit of the circuit breaker of the present utility model mainly aims to prevent the phenomenon of "circuit breaker bouncing" when the closing button is stuck. The added trip position monitoring circuit on the pole - mounted circuit breaker can monitor the faults in the power system in real time. When the circuit breaker trips due to a fault, the signal of the anti - bounce relay is sent to the monitoring system, and the system can immediately detect it and issue an alarm, helping the operation and maintenance personnel quickly locate the fault point; by monitoring the state of the circuit breaker, line faults can be detected and processed in a timely manner, reducing the power outage time and improving the reliability and stability of power supply; detecting and processing faults in a timely manner can avoid power safety accidents caused by equipment failures and ensure the safety of operation and maintenance personnel and the public.

[0028] Certainly, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the essence of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A 10KV high-voltage vacuum circuit breaker anti-jump circuit, characterized in that, It is mainly composed of a closing circuit, a tripping circuit, an anti-pumping circuit and a tripping position monitoring circuit. The circuit components included are closing and tripping buttons (SA), auxiliary switches (DL), travel switches (CK), anti-pumping relays (KA), tripping coils (TQ), closing coils (HQ), DC power supplies (KM) and terminal blocks (XT). The closing circuit and the tripping circuit are connected in parallel and used to remotely control the closing and tripping operations of the circuit breaker. The tripping position monitoring circuit is arranged at the left end of the closing circuit. The anti-pumping circuit is connected in parallel with the closing circuit and the tripping circuit. The anti-pumping circuit is set to prevent the circuit breaker from jumping when the closing button is stuck. The tripping position monitoring circuit is set to control the action of the anti-pumping circuit when the anti-pumping relay is activated in the tripping state.

2. The anti-jump circuit of a 10KV high-voltage vacuum circuit breaker according to claim 1, characterized in that, The closing circuit is set as follows: The first set of normally open contacts ① of the closing and tripping button (SA) is connected to the positive pole of the DC power supply (KM), and the normally open contact ② is connected to the normally closed contact ⑤ at one end of the anti-pumping relay (KA). The normally closed contact ① at the other end of the anti-pumping relay (KA) is connected to the normally open contact ⑦ at one end of the travel switch (CK). The normally open contact ⑧ at the other end of the travel switch (CK) is connected to the normally closed contact ① at one end of the auxiliary switch (DL). The normally open contact ③ at the other end of the auxiliary switch (DL) is connected to the contact ① at one end of the closing coil (HQ). The contact ② at the other end of the closing coil (HQ) is connected to the negative pole of the DC power supply (KM).

3. A 10KV high-voltage vacuum circuit breaker anti-jump circuit according to claim 1, characterized in that, The tripping circuit is set as follows: The second set of normally open contacts ③ of the closing and tripping button (SA) is connected to the positive pole of the DC power supply (KM), and the normally open contact ④ is connected to the normally open contact ⑥ at one end of the auxiliary switch (DL). The normally open contact ⑧ at the other end of the auxiliary switch (DL) is connected to the contact ① at one end of the tripping coil (TQ). The contact ② at the other end of the tripping coil (TQ) is connected to the negative pole of the DC power supply (KM).

4. A 10KV high-voltage vacuum circuit breaker anti-jump circuit according to claim 1, characterized in that The tripping position monitoring circuit is set as follows: One end (XT-1) of the terminal block (XT) is connected to the normally open contact ⑬ at one end of the auxiliary switch (DL). The normally open contact ⑮ at the other end of the auxiliary switch (DL) is connected to the normally closed contact ② at one end of the anti-pumping relay (KA). The normally closed contact ⑥ at the other end of the anti-pumping relay (KA) is connected to the other end (XT-2) of the terminal block (XT).

5. A 10KV high-voltage vacuum circuit breaker anti-jump circuit according to claim 1, characterized in that The anti-pumping circuit is set as follows: The normally open contact ② of the first set of the closing and tripping button (SA) is connected to the main circuit contact ⑦ at one end of the anti-pumping relay (KA). The main circuit contact ⑧ at the other end of the anti-pumping relay (KA) is respectively connected to the normally open contact ⑭ at one end of the auxiliary switch (DL) and the normally open contact ③ at one end of the anti-pumping relay (KA). The normally open contact ⑯ at the other end of the auxiliary switch (DL) and the normally open contact ⑤ at the other end of the anti-pumping relay (KA) are respectively connected to the negative pole of the DC power supply (KM).

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