Electromagnet for circuit breaker and opening control system thereof

Abstract

The invention discloses an electromagnet for a circuit breaker and an opening control system of the electromagnet, and the electromagnet comprises a split-type coil installation framework, the inner side of the split-type coil installation framework is provided with a main coil accommodating cavity and an auxiliary coil accommodating cavity, and the middle part of the split-type coil installation framework is provided with a sliding hole; the main coil is arranged in the main coil accommodating cavity, and one end of the main coil is provided with a main coil outgoing line; the main coil movable iron core is arranged in the sliding hole in a sliding manner; the auxiliary coil is arranged in the auxiliary coil accommodating cavity; the auxiliary coil movable iron core is arranged in the auxiliary coil containing cavity in a sliding mode, an electric contact is arranged at the end, close to the outgoing line of the main coil, of the auxiliary coil movable iron core and makes sliding contact with the auxiliary coil, and when the auxiliary coil movable iron core approaches the main coil, the electric contact can conduct the outgoing line of the main coil and the auxiliary coil. The opening control system comprises an electromagnet and an opening lock catch system, through two-stage electromagnet excitation, the power-on trigger time of the opening electromagnet is prolonged, the response time of the opening electromagnet acting on the opening lock catch system is delayed, and opening maloperation is prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-voltage switch products, and particularly relates to an electromagnetic iron for a circuit breaker and a tripping control system thereof. BACKGROUND

[0002] The circuit breaker control circuit is an important secondary circuit for realizing the functions of control, protection and monitoring of the circuit breaker, and is crucial to power supply reliability. However, with the expansion of the scale of the substation, the equivalent ground capacitance of the DC system caused by the secondary cable and the filter unit of the protection device of the substation increases, and forms an RLC second-order circuit with the resistance and inductance of the tripping coil and other elements in the tripping circuit of the circuit breaker. When the insulation of the cable is damaged or a single-point grounding of the tripping circuit is caused by a misoperation of personnel, the circuit breaker is prone to misoperation tripping. There have been similar cases in the power grid system and serious consequences have been caused. Therefore, it is necessary to develop a key component with grounding misoperation prevention and control capability and improved anti-single-point grounding interference capability of the tripping circuit of the circuit breaker.

[0003] To solve this problem, the existing solution is generally to increase the current of the electromagnetic iron to open the lock catch system of the operating mechanism of the circuit breaker, so that the induced current after the grounding of the tripping secondary circuit of the circuit breaker is less than the current of the electromagnetic iron to open the lock catch system of the operating mechanism of the circuit breaker. Then the circuit breaker will not misoperate tripping. However, this scheme needs to meet the requirements that the coil current of the operating mechanism of the circuit breaker cannot be greater than 2.5 A and the power cannot be greater than 500 W as required in the national standard GB 1984-2014. The optimization space is limited, and the lock catch system of the operating mechanism of the circuit breaker needs to be improved. The cost of power grid transformation is very large.

[0004] Therefore, how to provide an electromagnetic iron for a circuit breaker and a tripping control system thereof is a problem that those skilled in the art need to solve. SUMMARY

[0005] Therefore, the application provides a circuit breaker tripping electromagnetic iron and a circuit breaker control system thereof, which effectively solves the problem of circuit breaker tripping failure caused by grounding of the power grid system circuit, has small transformation difficulty, low use cost, and can realize delayed action of the electromagnetic iron of the operating mechanism of the circuit breaker after power-on, so that the time for the excitation current of the tripping coil of the circuit breaker mechanism to reach the operating current limit value of the circuit breaker mechanism is greater than the time of the transient current and voltage value induced by the grounding fault of the power grid system, thereby preventing misoperation tripping of the circuit breaker.

[0006] To achieve the above purpose, the application adopts the following technical scheme: an electromagnetic iron for a circuit breaker acting on a tripping lock catch system of a spring operating mechanism, comprising: a split type coil mounting framework, the inner side of the split type coil mounting framework having a main coil accommodating cavity and an auxiliary coil accommodating cavity, and a sliding hole being arranged at the middle part of the split type coil mounting framework. The main coil is detachably connected to the main coil receiving cavity, and one end of the main coil is provided with a main coil lead-out wire; The main coil moving iron core is slidably disposed in the sliding hole and moves based on the energization of the main coil. One end of the main coil moving iron core can act on the tripping latch system of the spring operating mechanism. An auxiliary coil is detachably connected to the auxiliary coil receiving cavity, and the auxiliary coil is connected to an external circuit through an auxiliary coil output wire. An auxiliary coil moving iron core is slidably disposed in the auxiliary coil accommodating cavity and moves based on the energization of the auxiliary coil. An overcurrent contact is provided at the end of the auxiliary coil moving iron core near the output of the main coil. The overcurrent contact slides in contact with the auxiliary coil. When the auxiliary coil moving iron core approaches the main coil, the overcurrent contact can conduct the output of the main coil and the auxiliary coil. The auxiliary coil extends the response time of the main coil being energized and the main coil moving iron core acting on the tripping latching system.

[0007] The beneficial technical effects of this invention are as follows: Based on the electromagnet principle of conventional spring-operated mechanisms, by adding an auxiliary coil to delay the energization time of the main coil, the extension time of the moving iron core of the main coil is delayed, thereby achieving a delayed triggering action after the tripping electromagnet is energized. This ensures that the time for the excitation current of the tripping coil of the circuit breaker mechanism to reach the operating current limit of the circuit breaker mechanism is greater than the time for the transient current and voltage values ​​induced by the ground fault in the power grid system, preventing the circuit breaker from tripping erroneously. Specifically, the excitation time of the auxiliary coil and the main coil to match the opening of the circuit breaker mechanism latching system can be designed according to the duration of the ground fault induced current in different power grid system circuits, ensuring that the circuit breaker mechanism will not trip erroneously before the ground fault induced current in the power grid system circuit disappears. Preferably, it also includes a main coil moving iron core reset spring, one end of which is connected to the split coil mounting frame and the other end is connected to the main coil moving iron core. The main coil moving iron core reset spring is used to return the main coil moving iron core to its original position.

[0008] The resulting technical effect is that the main coil moving iron core reset spring can retract and reset the main coil moving iron core after the main coil is de-energized, facilitating the start of the next cycle.

[0009] Preferably, it further includes an auxiliary coil moving iron core reset spring, which is disposed in the auxiliary coil receiving cavity. One end of the auxiliary coil moving iron core reset spring is connected to the cavity wall of the auxiliary coil receiving cavity, and the other end is connected to the auxiliary coil moving iron core. The auxiliary coil moving iron core reset spring causes the auxiliary coil moving iron core to tend to move away from the main coil and the main coil lead wire.

[0010] The resulting technical effect is that the design purpose of the auxiliary coil moving iron core reset spring is to make the auxiliary coil moving iron core tend to move away from the main coil. After the auxiliary coil is energized, the auxiliary coil moving iron core needs to overcome the elasticity of the auxiliary coil moving iron core reset spring to do work, thereby delaying the energization time of the main coil. After the auxiliary coil is de-energized, the auxiliary coil moving iron core can also maintain the state of separation from the main coil output, thereby avoiding the conduction of the auxiliary coil and the main coil.

[0011] Preferably, it also includes a striker, the sliding hole passing through both ends of the split coil mounting frame, the striker being slidably disposed in the sliding hole and abutting against the other end of the main coil moving iron core, the striker being able to push the main coil moving iron core to slide and act on the tripping latch system.

[0012] The resulting technical effect is that the strike rod can be manually controlled to extend the moving iron core of the main coil after the electromagnet fails to be energized, thus completing the tripping action and improving the reliability of the electromagnet.

[0013] Preferably, the split coil mounting frame has a button groove at one end near the impact rod, the sliding hole is opened at the bottom of the button groove, a button is slidably connected in the button groove, the button is fixedly connected to the impact rod, a button return spring is connected in the button groove, one end of the button return spring is connected to the button, and the other end is connected to the bottom of the button groove, and the button is located on the outer periphery of the impact rod.

[0014] The resulting technical effect is that the button can control the movement of the striker, making it convenient for users. At the same time, the striker can be reset by the button's reset spring, and under normal conditions, the striker will not interfere with the movement of the main coil's moving iron core.

[0015] Preferably, the split coil mounting frame has two split lines corresponding to the sections of the main coil accommodating cavity and the auxiliary coil accommodating cavity. The split coil mounting frame is divided into a front frame, a middle frame and a rear frame according to the two split lines. The front frame and the middle frame are detachably connected, and the middle frame and the rear frame are detachably connected.

[0016] The resulting technical effect is that the split coil mounting frame facilitates the installation of the main coil and auxiliary coil. In specific applications, the specifications of the auxiliary coil and main coil can be designed according to the duration of the ground induced current in different power grid system circuits to match the excitation time of the circuit breaker mechanism latching system.

[0017] Preferably, a support bridge is provided between the moving iron core of the auxiliary coil and the overcurrent contact, the support bridge providing a mounting base for the overcurrent contact, the support bridge being made of plastic or ceramic material, and the overcurrent contact being made of conductive but non-magnetic material.

[0018] The resulting technical effect is that the overcurrent contact is used to establish an energized connection between the main coil and the auxiliary coil. Specifically, in order not to affect the use of the electromagnet, the overcurrent contact is made of a conductive but non-magnetic material, and the support bridge is made of a non-conductive and non-magnetic material.

[0019] The present invention also discloses a circuit breaker tripping control system, which includes the aforementioned electromagnet and tripping latching system. The moving iron core of the main coil of the electromagnet can extend and act on the tripping latching system, thereby disrupting the energy retention mechanism of the tripping spring and realizing the tripping of the circuit breaker. The electromagnet extends the extension reaction time of the moving iron core of the main coil through the auxiliary coil and the main coil, thereby delaying the action of the electromagnet of the circuit breaker operating mechanism after it is energized, and avoiding the excitation current caused by grounding faults from driving the tripping electromagnet to act and preventing false tripping.

[0020] The resulting technical effects are as follows: This invention effectively solves the problem of circuit breaker tripping faults caused by grounding in the power grid system. Since the induced current and voltage caused by a grounding fault in the power grid system's tripping circuit are transient processes, the tripping control system of this invention, based on electromagnet control, can design auxiliary and main coils according to the duration of the induced current from grounding in different power grid system circuits. This matches the excitation time of the circuit breaker mechanism's latching system, ensuring that the circuit breaker mechanism will not malfunction before the induced current from grounding in the power grid system circuit disappears. Simultaneously, it reduces the difficulty of upgrading existing power grid products and lowers operation and maintenance costs. This invention does not change the structure and stress state of the original circuit breaker operating mechanism's electromagnet coil and the operating mechanism's tripping latching system; only the tripping electromagnet needs to be replaced to upgrade the power grid system products, reducing operation and maintenance costs and improving product reliability. Attached Figure Description

[0021] Fig. 1 This is a structural diagram of an electromagnet for a circuit breaker according to the present invention; Fig. 2 This is a schematic diagram of the control circuit of the tripping control system of the present invention; Fig. 3 This is a schematic diagram of the existing tripping control circuit.

[0022] 1. Split-type coil mounting frame; 11. Main coil housing cavity; 12. Auxiliary coil housing cavity; 13. Sliding hole; 14. Button slot; 15. Front frame; 16. Middle frame; 17. Rear frame; 2. Main coil; 21. Main coil lead-out; 3. Main coil moving iron core; 4. Auxiliary coil; 41. Auxiliary coil lead-out; 5. Auxiliary coil moving iron core; 6. Overcurrent contact; 7. Main coil moving iron core return spring; 8. Auxiliary coil moving iron core return spring; 9. Striking rod; 10. Button; 20. Button return spring; 30. Support bridge; QF1 - Miniature circuit breaker for control circuit; SBT1 - Proximity control / remote control selector switch; S1 - Auxiliary switch; YT1 - Auxiliary coil of tripping electromagnet; YT2 - Main coil of tripping electromagnet; XP1 - Plug-in terminal. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] See the appendix of this invention. Figs. 1-2 , Fig. 3 For reference to existing technology, according to an embodiment of the present invention, an electromagnet for a circuit breaker, acting on a spring-operated mechanism, includes: a split-type coil mounting frame 1, the split design facilitating the replacement of the main coil and the auxiliary coil, the inner side of the split-type coil mounting frame 1 having a main coil receiving cavity 11 and an auxiliary coil receiving cavity 12, both of which are annular cavities, and a sliding hole 13 provided in the middle of the split-type coil mounting frame 1; Main coil 2 is detachably connected to main coil receiving cavity 11, and one end of main coil 2 is provided with main coil output wire 21; The main coil moving iron core 3 is slidably disposed in the sliding hole 13 and moves based on the energization of the main coil 2. One end of the main coil moving iron core 3 can act on the opening latching system of the spring operating mechanism. Auxiliary coil 4 is detached and connected to auxiliary coil receiving cavity 12. Auxiliary coil 4 is connected to external circuit through auxiliary coil output wire 41. The auxiliary coil moving iron core 5 is slidably disposed in the auxiliary coil accommodating cavity 12 and moves based on the energization of the auxiliary coil 4. An overcurrent contact 6 is provided at the end of the auxiliary coil moving iron core 5 near the main coil output line 21. The overcurrent contact 6 slides in contact with the auxiliary coil 4. When the auxiliary coil moving iron core 5 approaches the main coil 2, the overcurrent contact 6 can conduct the main coil output line 21 and the auxiliary coil 4. Through the excitation of the two-stage electromagnet, the response time of the main coil moving iron core 3 acting on the tripping latch system is extended, thus avoiding false tripping. In some other embodiments, a main coil moving iron core reset spring 7 is also included. The main coil moving iron core reset spring 7 is disposed inside the sliding hole of the split coil mounting frame. The sliding hole is a stepped hole. One end of the spring is connected to the split coil mounting frame 1, and the other end is connected to the main coil moving iron core 3. The main coil moving iron core reset spring 7 is used to return the main coil moving iron core 3 to its original position.

[0025] In some other specific embodiments, an auxiliary coil moving iron core reset spring 8 is also included. The auxiliary coil moving iron core reset spring 8 is disposed in the auxiliary coil receiving cavity 12. One end of the auxiliary coil moving iron core reset spring 8 is connected to the cavity wall of the auxiliary coil receiving cavity 12, and the other end is connected to the auxiliary coil moving iron core 5 (the end of the auxiliary coil moving iron core 5 has a connecting boss that matches the reset spring). The auxiliary coil moving iron core reset spring 8 causes the auxiliary coil moving iron core 5 to tend to move away from the main coil 2 and the main coil output wire 21.

[0026] In some other embodiments, a strike rod 9 is also included. The sliding hole 13 passes through both ends of the split coil mounting frame 1. The strike rod 9 is slidably disposed in the sliding hole 13 and can abut against the other end of the main coil moving iron core 3. The strike rod 9 can push the main coil moving iron core 3 to slide and act on the tripping locking system.

[0027] In some other specific embodiments, the split coil mounting frame 1 is provided with a button groove at one end near the impact rod 9, and a sliding hole 13 is opened at the bottom of the button groove 14. A button 10 is slidably connected in the button groove 14. The button 10 is fixedly connected to the impact rod 9. A button reset spring 20 is connected in the button groove 14. One end of the button reset spring 20 is connected to the button 10, and the other end is connected to the bottom of the button groove 14. The button 10 is located on the outer periphery of the impact rod 9.

[0028] In other embodiments, the split coil mounting frame 1 has two split lines corresponding to the sections of the main coil housing cavity 11 and the auxiliary coil housing cavity 12. The split coil mounting frame 1 is divided into a front frame 15, a middle frame 16 and a rear frame 17 by the two split lines. The front frame 15 and the middle frame 16 are detachably connected, and the middle frame 16 and the rear frame 17 are detachably connected. The main coil housing cavity 11 is formed between the front frame 15 and the middle frame 16, and the auxiliary coil housing cavity 12 is formed between the middle frame 16 and the rear frame 17. The middle frame 16 is provided with a slot for laying the main coil outlet wire 21. The slot connects the main coil housing cavity 11 and the auxiliary coil housing cavity 12.

[0029] In some other embodiments, a support bridge 30 is provided between the auxiliary coil moving iron core 5 and the overcurrent contact 6. The support bridge 30 provides a mounting base for the overcurrent contact 6. The support bridge 30 is formed of a non-conductive and non-magnetic material, specifically plastic or ceramic. The overcurrent contact 6 is formed of a conductive and non-magnetic material, which can be a non-ferrous metal.

[0030] The present invention also discloses a circuit breaker tripping control system, which includes the aforementioned electromagnet and tripping latching system. The moving iron core 3 of the main coil of the electromagnet can extend and act on the tripping latching system, thereby disrupting the energy retention mechanism of the tripping spring and realizing the tripping of the circuit breaker. The electromagnet extends the extension reaction time of the moving iron core of the main coil through two stages of coils, namely the auxiliary coil and the main coil, thereby delaying the action of the electromagnet of the circuit breaker operating mechanism after it is energized, and avoiding the excitation current caused by grounding faults from driving the tripping electromagnet to act and preventing false tripping.

[0031] The specific workflow is as follows: Fig. 2 The circuit breaker operating mechanism shown is in the open position when the circuit breaker is not energized. During operation, the circuit breaker mechanism is in the closed, energized position, the control circuit is closed using miniature circuit breaker QF1, the local / remote control selector switch SBT1 is in remote control mode, and contacts 5-7 and 37-39 of auxiliary switch S1 are closed. When a fault occurs in the power grid system or maintenance is required, the circuit breaker must perform an open operation. At this time, the circuit breaker mechanism open circuit 127-121 is activated, and the open electromagnet auxiliary coil YT1 is energized. (With the auxiliary coil output line 41 energized), the auxiliary coil moving iron core 5, under the electromagnetic force of the auxiliary coil of the tripping electromagnet auxiliary coil 4, compresses the auxiliary coil moving iron core return spring 8 until the overcurrent contact 6 on the auxiliary coil moving iron core 5 connects with the end of the main coil output line 21, causing the tripping electromagnet main coil 2 to be energized. Under the electromagnetic force of the tripping electromagnet main coil 2, the main coil moving iron core 3 compresses the main coil moving iron core return spring 7, and the main coil moving iron core 3 extends and pushes the circuit breaker mechanism tripping latch system, destroying the mechanism's tripping energy storage and holding, thus realizing the circuit breaker tripping. This invention, through two-stage electromagnet excitation, is equivalent to extending the response time of the circuit breaker mechanism, avoiding the excitation current caused by ground faults driving the tripping electromagnet to operate, which would lead to the circuit breaker maloperating and tripping.

[0032] After the circuit breaker trips, contacts 5-7 and 37-39 of auxiliary switch S1 switch states (during the circuit breaker tripping process, the auxiliary switch switching state is simultaneously controlled by the linkage mechanism, which is related to the main drive control of the circuit breaker). When they are in the open circuit state, the auxiliary coil YT1 of the tripping electromagnet is de-energized, and the moving iron core 5 of the auxiliary coil disconnects from the end of the main coil output line 21 under the action of the moving iron core reset spring 8. Fig. 2 When the contacts 1-2 of the auxiliary coil YT1 of the tripping electromagnet are opened, the main coil 2 of the tripping electromagnet is de-energized. Under the action of the reset spring 7 of the moving iron core of the main coil, it returns to the initial state and waits for the next command to be executed.

[0033] This invention, without altering the existing circuit breaker mechanism's tripping coil, tripping structure, or stress distribution, extends the energizing time of the main tripping coil by adding an auxiliary tripping electromagnet. This avoids the period of transient induced current surges caused by power grid system faults, thus solving the problem of circuit breaker maloperation in the power grid system and ensuring the safe and stable operation of the power grid. It is applicable to a wide range of operating mechanism products. Based on the circuit parameters such as resistance, inductance, and capacitance of the power grid circuits at different substations and with varying ages, existing substation equipment only requires adjustment and replacement of the circuit breaker mechanism's electromagnet coil. The invention is simple to operate, convenient for maintenance and repair, highly versatile, and low-cost, providing technical support for the safe and stable operation of the power grid, resulting in significant economic and social benefits.

[0034] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromagnet for a circuit breaker, acting on a spring-operated mechanism in a tripping latching system, characterized in that, include: The split coil mounting frame (1) has a main coil accommodating cavity (11) and an auxiliary coil accommodating cavity (12) on its inner side, and a sliding hole (13) is provided in the middle of the split coil mounting frame (1). The main coil (2) is detachably connected to the main coil receiving cavity (11), and one end of the main coil (2) is provided with a main coil output wire (21). The main coil moving iron core (3) is slidably disposed in the sliding hole (13) and moves based on the energization of the main coil (2). One end of the main coil moving iron core (3) can act on the opening latch system of the spring operating mechanism. An auxiliary coil (4) is detachably connected to the auxiliary coil receiving cavity (12), and the auxiliary coil (4) is connected to an external circuit through an auxiliary coil output wire (41). The auxiliary coil moving iron core (5) is slidably disposed in the auxiliary coil accommodating cavity (12) and moves based on the energization of the auxiliary coil (4). The auxiliary coil moving iron core (5) is provided with an overcurrent contact (6) at one end near the main coil output line (21). The overcurrent contact (6) slides in contact with the auxiliary coil (4). When the auxiliary coil moving iron core (5) approaches the main coil (2), the overcurrent contact (6) can conduct the main coil output line (21) and the auxiliary coil (4). The auxiliary coil extends the response time of the main coil (2) being energized and the main coil moving iron core (3) acting on the tripping latching system.

2. The electromagnet for a circuit breaker according to claim 1, characterized in that, It also includes a main coil moving iron core reset spring (7), one end of which is connected to the split coil mounting frame (1) and the other end is connected to the main coil moving iron core (3). The main coil moving iron core reset spring (7) is used for the main coil moving iron core (3) to return to its original position.

3. The electromagnet for a circuit breaker according to claim 1, characterized in that, It also includes an auxiliary coil moving iron core reset spring (8), which is located in the auxiliary coil accommodating cavity (12). One end of the auxiliary coil moving iron core reset spring (8) is connected to the cavity wall of the auxiliary coil accommodating cavity (12), and the other end is connected to the auxiliary coil moving iron core (5). The auxiliary coil moving iron core reset spring (8) causes the auxiliary coil moving iron core (5) to tend to move away from the main coil (2) and the main coil lead (21).

4. The electromagnet for a circuit breaker according to claim 1, characterized in that, It also includes a strike rod (9), the sliding hole (13) passes through both ends of the split coil mounting frame (1), the strike rod (9) is slidably disposed in the sliding hole (13) and can abut against the other end of the main coil moving iron core (3), the strike rod (9) can push the main coil moving iron core (3) to slide and act on the tripping latch system.

5. An electromagnet for a circuit breaker according to claim 4, characterized in that, The split coil mounting frame (1) has a button groove at one end near the impact rod (9). The sliding hole (13) is opened at the bottom of the button groove (14). A button (10) is slidably connected in the button groove (14). The button (10) is fixedly connected to the impact rod (9). A button reset spring (20) is connected in the button groove (14). One end of the button reset spring (20) is connected to the button (10), and the other end is connected to the bottom of the button groove (14). The button (10) is located on the outer periphery of the impact rod (9).

6. The electromagnet for a circuit breaker according to claim 1, characterized in that, The split coil mounting frame (1) is provided with two split lines corresponding to the sections of the main coil accommodating cavity (11) and the auxiliary coil accommodating cavity (12). The split coil mounting frame (1) is divided into a front frame (15), a middle frame (16) and a rear frame (17) corresponding to the two split lines. The front frame (15) and the middle frame (16) are detached and connected. The middle frame (16) and the rear frame (17) are detached and connected.

7. The electromagnet for a circuit breaker according to claim 1, characterized in that, A support bridge (30) is provided between the auxiliary coil moving iron core (5) and the overcurrent contact (6). The support bridge (30) provides the mounting base for the overcurrent contact (6). The support bridge (30) is made of plastic or ceramic material, and the overcurrent contact (6) is made of conductive but non-magnetic material.

8. A tripping control system, characterized in that, Including the electromagnet and tripping latch system as described in any one of claims 1-7, the moving iron core (3) of the main coil of the electromagnet can extend and act on the tripping latch system, destroying the energy retention mechanism of the tripping spring, and realizing the tripping of the circuit breaker. The electromagnet extends the extension reaction time of the moving iron core of the main coil through the auxiliary coil and the main coil, realizing the delayed action of the electromagnet of the circuit breaker operating mechanism after being energized, avoiding the excitation current caused by the ground fault driving the tripping electromagnet to act and the tripping malfunction.

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