Breaker anti-tripping module

Abstract

The utility model provides an anti-tripping module of a circuit breaker, which comprises a mechanism anti-tripping relay K11 body, and a normally-closed contact of the mechanism anti-tripping relay K11 and a normally-closed contact of a circuit breaker S5 are connected in series, are connected into a whole, are connected to a tripping position relay TWJ in a relay and then are connected into a closing loop. The circuit breaker anti-jumping module has the beneficial effects that 1, the circuit breaker anti-jumping module can prevent the circuit breaker from jumping during remote operation, measurement and control protection operation and mechanism on-site operation of the circuit breaker; and 2, the circuit breaker anti-tripping module solves the problems that after the mechanism anti-tripping relay K11 is started, although a closing contact is separated, the mechanism anti-tripping relay K11 is electrified through a loop of the tripping position relay TWJ and does not return because the impedance between the mechanism anti-tripping relay K11 and the tripping position relay TWJ is not well matched, so that the mechanism anti-tripping relay K11 cannot be switched off. And the circuit breaker S5 cannot be switched on.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution station protection and control, in particular to a circuit breaker anti-tripping module. Background Art

[0002] Circuit breakers are crucial primary equipment in power systems, and anti-tripping circuits are a crucial component of their control circuits. Circuit breaker tripping occurs when a circuit breaker repeatedly opens and closes within a short period of time due to contact adhesion or other reasons. If reliable measures are not taken, this can cause fault currents to repeatedly impact the power system, reducing the circuit breaker's breaking capacity. In even worse cases, it could cause an explosion, threatening personal and equipment safety. Therefore, effective measures must be taken to prevent circuit breaker tripping, improve equipment reliability, extend its service life, and ensure the safe, reliable, and healthy operation of the power system.

[0003] Its application method: Utilize the mechanical interlock of the operating mechanism itself or add an anti-trip relay to the operating circuit to prevent tripping. Tripping occurs when a circuit breaker is closed to a fault and protection trips the circuit breaker. For some reason (such as the closing button not being reset), the circuit breaker inadvertently closes again, resulting in unnecessary multiple opening and closing cycles. To prevent this, an anti-trip circuit is designed to disconnect the closing circuit when the circuit breaker is closed to a fault, through the activation of an anti-trip relay, preventing the circuit breaker from closing again, thus achieving the anti-trip function.

[0004] Circuit breaker anti-tripping technology is a key protection measure in power systems. It aims to prevent repeated circuit breaker tripping due to operational or fault conditions, thereby protecting power equipment and systems from damage. With the development and increasing intelligence of power systems, circuit breaker anti-tripping technology is also constantly improving to adapt to the needs of higher voltage levels and larger capacity power grids.

[0005] Circuit breaker anti-trip technology mainly involves the following aspects:

[0006] Equipment safety: Frequent circuit breaker tripping not only accelerates equipment wear but can also cause overheating, damage, and even more serious failures. Anti-tripping technology effectively prevents this from happening through rapid detection and response.

[0007] System stability: Circuit breaker tripping can affect power system stability, potentially causing voltage fluctuations, frequency changes, or even system disconnection. Anti-tripping technology helps maintain stable system operation and minimizes impacts on other equipment and the entire grid.

[0008] Intelligent Development: With the intelligent upgrade of power systems, circuit breaker anti-tripping technology is also developing in a more intelligent direction. By introducing technologies such as microprocessors and sensors, real-time monitoring and control of circuit breaker status can be achieved, improving the efficiency and accuracy of anti-tripping technology.

[0009] Standards and specifications: To ensure the safety and reliability of circuit breaker anti-tripping technology, corresponding standards and specifications have been formulated both internationally and domestically. These standards and specifications not only specify the performance requirements of anti-tripping technology, but also put forward specific requirements for its implementation and maintenance.

[0010] In summary, circuit breaker anti-tripping technology is a crucial component of power system protection. Its technical background encompasses multiple aspects, including equipment safety, system stability, intelligent development, and standards and regulations. With continued technological advancement, circuit breaker anti-tripping technology will become more mature and reliable, providing a strong guarantee for the safe and stable operation of power systems.

[0011] There are two main types of circuit breaker anti-tripping technologies: protection anti-tripping and mechanism anti-tripping.

[0012] 1. Protection against tripping is achieved via an anti-tripping relay on the operating panel inside the protection device. Pressing trip button SB2 activates trip-holding relay TBJ, closing its normally open contacts. If button SB1 is stuck (13 and 14 are conductive), anti-tripping relay FTJ energizes and closes, breaking the closing circuit. The advantage of microcomputer-based protection against tripping is the elimination of parasitic circuits. However, it does not prevent tripping during local operation of the circuit breaker.

[0013] 2. Mechanism anti-tripping: Pressing the closing button SB1 closes the auxiliary contacts of circuit breaker S5 (13 and 14 are conductive). This activates the mechanism's anti-tripping relay K11, opening its normally closed contacts (12 and 4 are disconnected), cutting off the power supply to closing coil HQ. The advantage of this mechanism anti-tripping feature is that it prevents the circuit breaker from tripping during remote protection operation, measurement and control operations, and local mechanism operation. However, a disadvantage is that a parasitic circuit may exist between the anti-tripping relay K11 and the trip position relay TWJ. When the circuit breaker S5 is in the closed position, the closing position relay HWJ is energized and the closing indicator light HR is on. However, if the impedance between the mechanism anti-trip relay K11 and the trip position relay TWJ is not well matched, the normally open contact of the circuit breaker will be closed, which will cause the trip position relay TWJ to be energized and the open position indicator light to light up. The device's open and closed position lights will light up at the same time, which is an incorrect position indication. The impedance mismatch between the mechanism anti-trip relay K11 and the trip position relay TWJ will also cause the mechanism anti-trip relay K11 to be activated. Although the closing contacts are separated, the mechanism anti-trip relay K11 will be energized through the trip position relay TWJ circuit. The mechanism anti-trip relay K11 will not return, and the circuit breaker S5 cannot be closed. Utility Model Content

[0014] In order to solve the problem in the prior art that the circuit breaker cannot be prevented from tripping and the parasitic circuit of the mechanism anti-tripping is formed during local operation of the protection anti-tripping circuit breaker, the utility model provides a circuit breaker anti-tripping module, which includes a mechanism anti-tripping relay K11 body, and a normally closed contact of the mechanism anti-tripping relay K11 connected in series with a normally closed contact of the circuit breaker S5. The series connection is integrated and connected to the internal trip position relay TWJ of the relay protection and then connected to the closing circuit.

[0015] As a further improvement of the present invention, the mechanism anti-trip relay K11 also includes a mechanism anti-trip relay K11 normally closed contact and a mechanism anti-trip relay K11 normally open contact. The common end of the mechanism anti-trip relay K11 and the mechanism anti-trip relay K11 normally open contact is connected to the normally closed contact of the circuit breaker S5.

[0016] As a further improvement of the present invention, the mechanism anti-trip relay K11 further includes a mechanism anti-trip relay K11 coil, and the mechanism anti-trip relay K11 coil is connected in series with the mechanism anti-trip relay K11 normally open contact.

[0017] The beneficial effects of the present invention are as follows: 1. The circuit breaker anti-trip module of the present invention can prevent the circuit breaker from tripping when the circuit breaker is remotely operated or under measurement, control and protection operation as well as when the mechanism is locally operated; 2. The circuit breaker anti-trip module of the present invention solves the problem that after the mechanism anti-trip relay K11 is started, although the closing contacts are separated, the mechanism anti-trip relay K11 will be energized through the trip position relay TWJ circuit, and the mechanism anti-trip relay K11 will not return, so the circuit breaker S5 cannot be closed due to the poor impedance matching between the mechanism anti-trip relay K11 and the trip position relay TWJ; 3. The circuit breaker anti-trip module of the present invention is not only simple in structure, but can also ensure the stable operation of electrical equipment, extend the service life, improve the safety of equipment and ensure the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the principle diagram of the circuit breaker anti-tripping module of the utility model. DETAILED DESCRIPTION

[0019] To address the parasitic circuit issue, a pair of mechanism anti-trip relays K11 (normally closed contacts 11, 3) and circuit breaker S5 (normally closed contacts 31, 32) can be connected in series after the internal trip position relay TWJ, and then connected to the closing circuit. This effectively resolves the issues of the prior art. Because the mechanism can prevent circuit breaker tripping during both remote protection or measurement and control operations and local operation, the present invention utilizes mechanism anti-trip relays K11.

[0020] like Figure 1As shown, the utility model discloses a circuit breaker anti-trip module, including a mechanism anti-trip relay K11 and normally closed contacts 31 and 32 of a circuit breaker S5. The mechanism anti-trip relay K11 includes normally closed contacts 11 and 3 of the mechanism anti-trip relay K11. The normally closed contacts 11 and 3 of the mechanism anti-trip relay K11 are connected in series with the normally closed contacts 31 and 32 of the circuit breaker S5. The normally closed contacts 11 and 3 of the mechanism anti-trip relay K11 and the normally closed contacts 31 and 32 of the circuit breaker S5 connected in series are used to be connected in series with the internal trip position relay TWJ of the relay protection and then connected to the closing circuit.

[0021] The mechanism anti-trip relay K11 also includes a normally closed contact 12,4 of the mechanism anti-trip relay K11 and a normally open contact 12,8 of the mechanism anti-trip relay K11. The common end of the mechanism anti-trip relay K11 12,4 and the normally open contact 12,8 of the mechanism anti-trip relay K11 is connected to the normally closed contacts 31 and 32 of the circuit breaker S5.

[0022] The mechanism anti-trip relay K11 further includes mechanism anti-trip relay K11 coils 14 and 13. The mechanism anti-trip relay K11 coils 14 and 13 are connected in series with the mechanism anti-trip relay K11 normally open contacts 12 and 8.

[0023] The connection method of the circuit breaker anti-trip module of the utility model is as follows:

[0024] 1. Get the DC48V power supply +KM (positive bus) and -KM (negative bus) from the DC panel and lead them to the upper end of the voltage terminal of the instrument box. Lead them out from the lower end to the upper end of the miniature circuit breaker QA1, and then lead them from the lower end of the miniature circuit breaker QA1 to the voltage terminal.

[0025] 2. According to the secondary diagram, connect the transfer switch ZK, closing buttons SB1, SB2, microcomputer line protection device FA, mechanism anti-trip relay K11, trip coil TQ, closing coil HQ and switch auxiliary contacts S7, S6, S5 to the voltage terminals.

[0026] 3. Turn function transfer switch ZK to the local position and press closing button SB1. Closing coil HQ energizes, releasing the spring action and switching circuit breaker S5 from the open position to the closed position. Normally open contacts 13 and 14 of circuit breaker S5 close, energizing coils 14 and 13 of mechanism anti-trip relay K11. At this point, normally open contacts 12 and 8 of mechanism anti-trip relay K11 close, forming a self-holding circuit that keeps mechanism anti-trip relay K11 in the operative state. Normally closed contacts 31 and 32 of circuit breaker S5 and normally closed contacts 11 and 3 of anti-trip relay K11 open, cutting off power to the coil of trip position relay TWJ. The open position indicator HG turns off, while the closed position relay HWJ energizes and closes, illuminating the closed position indicator HR.

[0027] 4. At the same time, the normally closed contacts 12, 4 of the mechanism anti-tripping relay K11 in the closing circuit are disconnected. If the circuit breaker is closed due to a fault, the protection action trips the circuit breaker. Because the power supply of the closing coil HQ is cut off, the circuit breaker S5 cannot be closed again, thus realizing the anti-tripping function of the circuit breaker.

[0028] The beneficial effects of the present invention are as follows: 1. The circuit breaker anti-trip module of the present invention can prevent the circuit breaker from tripping when the circuit breaker is remotely operated or under measurement, control and protection operation as well as when the mechanism is locally operated; 2. The circuit breaker anti-trip module of the present invention solves the problem that after the mechanism anti-trip relay K11 is started, although the closing contacts are separated, the mechanism anti-trip relay K11 will be energized through the trip position relay TWJ circuit, and the mechanism anti-trip relay K11 will not return, so the circuit breaker S5 cannot be closed due to the poor impedance matching between the mechanism anti-trip relay K11 and the trip position relay TWJ; 3. The circuit breaker anti-trip module of the present invention is not only simple in structure, but can also ensure the stable operation of electrical equipment, extend the service life, improve the safety of equipment and ensure the safety of personnel.

[0029] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker anti-trip module, characterized by: The invention comprises a mechanism anti-trip relay body K11 and a circuit breaker S5 normally closed contact (31, 32); the mechanism anti-trip relay body K11 comprises a mechanism anti-trip relay K11 normally closed contact (11, 3); the mechanism anti-trip relay K11 normally closed contact (11, 3) and the circuit breaker S5 normally closed contact (31, 32) are connected in series; the mechanism anti-trip relay K11 normally closed contact (11, 3) and the circuit breaker S5 normally closed contact (31, 32) connected in series as one are used to be connected in series to a trip position relay TWJ inside the relay protection and then connected to a closing circuit.

2. The circuit breaker anti-trip module according to claim 1, characterized in that: The mechanism anti-trip relay K11 further includes a mechanism anti-trip relay K11 normally closed contact (12, 4) and a mechanism anti-trip relay K11 normally open contact (12, 8); a common end of the mechanism anti-trip relay K11 (12, 4) and the mechanism anti-trip relay K11 normally open contact (12, 8) is connected to the circuit breaker S5 normally closed contact (31, 32).

3. The circuit breaker anti-trip module according to claim 2, characterized in that: The mechanism anti-trip relay K11 further comprises a mechanism anti-trip relay K11 coil (14, 13), and the mechanism anti-trip relay K11 coil (14, 13) is connected in series with the mechanism anti-trip relay K11 normally open contact (12, 8).

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