Reclosing residual current protection circuit breaker

Abstract

The utility model relates to a reclosing residual current protection circuit breaker, which comprises a base, a middle cover, a surface cover, an operating mechanism, an automatic reclosing mechanism, three groups of contact modules, a mutual inductor module and a circuit board control module arranged in the middle cover, three conductive parts extending out of the contact box are arranged at one ends of outgoing line static contacts of the three groups of contact modules, an insulating support cover is arranged in the base corresponding to the three conductive parts, the insulating support cover is separated between the three conductive parts and the base, and three groups of temperature measuring assemblies are respectively arranged on the insulating support cover corresponding to three wiring parts of the three conductive parts. The temperature measuring assembly comprises a temperature sensing probe and a wiring nose, the wiring nose is connected with the temperature sensing probe, and the temperature sensing probe is connected with the circuit board control module through a wire harness. The utility model has the advantages of simple structure, stable and reliable performance, high assembly efficiency and accurate temperature measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a reclosing residual current protection circuit breaker. Background Art

[0002] A circuit breaker is a distribution device used in a power grid. It can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry and disconnect current for a certain period of time under specified abnormal conditions (such as overload, short circuit, leakage, undervoltage and single-phase grounding fault). With the development of the power industry, the operating mechanism of the molded case circuit breaker has gradually become the mainstream of current development, and the design is developing in the direction of miniaturization and intelligence. The automatic reclosing mechanism is a special accessory for molded case circuit breakers. After cooperating with the circuit breaker, it can remotely close, disconnect and re-lock the circuit breaker to realize the centralized and automatic control of the transmission and distribution network. The internal structure of the existing reclosing residual current protection circuit breaker cannot be integrated and modularized, and modular assembly cannot be realized. The assembly efficiency is low and the production cost is high. In addition, the structural design of the temperature measurement component of the reclosing residual current protection circuit breaker is complex, the assembly is not convenient, and the temperature measurement is not accurate. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a reclosing residual current protection circuit breaker with simple structure, stable and reliable performance, high assembly efficiency and accurate temperature measurement.

[0004] To achieve the above-mentioned purpose, the utility model adopts a reclosing residual current protection circuit breaker, including a base, a middle cover arranged on the base, a surface cover arranged on the middle cover, an operating mechanism arranged in the base, an automatic reclosing mechanism arranged in the middle cover and used to drive the operating mechanism to perform opening and closing actions, three groups of contact modules respectively arranged in the base and linked with the operating mechanism, a mutual inductor module, and a circuit board control module arranged in the middle cover. The contact module includes a contact box arranged in the base, a moving contact frame rotatably arranged in the contact box and linked with the operating mechanism, a moving contact arranged on the moving contact frame, an incoming line static contact arranged in the contact box and matched with the moving contact, An outgoing static contact is arranged in the contact box and cooperates with the moving contact, one end of the outgoing static contact of the three groups of contact modules has three conductive parts extending outside the contact box, an insulating support cover is arranged at the corresponding three conductive parts in the base, the insulating support cover is separated between the three conductive parts and the base, and three groups of temperature measuring components are respectively arranged at the three wiring parts corresponding to the three conductive parts on the insulating support cover, the temperature measuring components include a temperature sensing probe arranged on the insulating support cover at the corresponding wiring part, a wiring nose arranged on the insulating support cover and in contact with the wiring part, the wiring nose is connected to the temperature sensing probe, and the temperature sensing probe is connected to the circuit board control module through a wiring harness.

[0005] The beneficial effects of the above structure are as follows: The temperature measurement component is designed with a modular structure, which facilitates the assembly of the temperature measurement component and the insulating support cover, with higher assembly efficiency. Moreover, the temperature sensing probe contacts the wiring part through a wiring nose, and the contact between the wiring nose and the wiring part is more reliable, ensuring that the temperature sensing probe can accurately monitor the temperature of the wiring part and making the temperature acquisition more reliable. The three contact modules are independently arranged in the base, with better insulation performance between them. The outlet static contacts of the three contact modules have a conductive part with an integrated lead-out structure, with better electrical conductivity and lower temperature rise. Therefore, this reclosing residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency, and accurate temperature measurement.

[0006] Particularly, a receiving groove for placing the wire harness is provided on the insulating support cover corresponding to the temperature sensing probe. A pressing plate that presses on the wire harness is arranged in the receiving groove, and a wiring groove communicating with the receiving groove is provided on the insulating support cover. The insulating support cover is provided with a receiving groove and a wiring groove for wiring, which can ensure that the wiring of the wire harness is neater and more beautiful, and is conducive to improving the assembly efficiency of the temperature measurement component and the insulating support cover.

[0007] Particularly, three exhaust channels are respectively formed between the insulating support cover and the base corresponding to the three groups of contact modules, and exhaust holes communicating with the three exhaust channels are provided on the contact boxes of the three groups of contact modules. The exhaust holes of the contact box communicate with the exhaust channels of the insulating support cover, which can ensure the rapid discharge of the high-pressure gas in the contact box, ensure the arc extinguishing performance of the contact module, and is conducive to extending the service life of the contact module.

[0008] Particularly, exhaust guiding grooves matching the contact boxes of the three groups of contact modules are respectively arranged in the insulating support cover. Clamping convex rings are provided on the contact boxes of the three groups of contact modules corresponding to the exhaust holes, and buckling grooves matching the clamping convex rings are arranged in the exhaust guiding grooves. The clamping convex rings are clamped in the buckling grooves, forming a clamping fit between the contact boxes of the three groups of contact modules and the insulating support cover. The insulating support cover and the contact box are assembled by a clamping fit method, with higher assembly efficiency, and can ensure that the high-pressure gas in the contact box can quickly enter the exhaust guiding grooves, which is conducive to improving the working reliability of this reclosing residual current protection circuit breaker.

[0009] Particularly, the current transformer module includes a zero-sequence current transformer arranged on the insulating support cover, three metering current transformers respectively arranged on the insulating support cover, and three protective current transformers respectively arranged on the insulating support cover. The wiring parts of the three conductive parts sequentially pass through the zero-sequence current transformer, the three metering current transformers, and the three protective current transformers and extend outside the insulating support cover. The current transformer module is integrated on the insulating support cover, which is conducive to realizing the modular assembly of the current transformer module and the base, with higher assembly efficiency. Description of the Drawings

[0010] Figure 1 It is a stereogram of an embodiment of the utility model.

[0011] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0012] Figure 3 This is an exploded view of an embodiment of the utility model.

[0013] Figure 4 It is a three-dimensional diagram of the insulating support cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figures 1 to 4 As shown, the embodiment of the utility model is a reclosing residual current protection circuit breaker, including a base 10, a middle cover 11 arranged on the base 10, a surface cover 12 arranged on the middle cover 11, an operating mechanism 13 arranged in the base 10, an automatic reclosing mechanism 14 arranged in the middle cover 11 and used to drive the operating mechanism 13 to perform opening and closing actions, three groups of contact modules 20 respectively arranged in the base 10 and linked with the operating mechanism 13, a mutual inductor module 30, and a circuit board control module 15 arranged in the middle cover 11, wherein the contact module 20 includes a contact box 21 arranged in the base 10, a moving contact frame 22 rotatably arranged in the contact box 21 and linked with the operating mechanism 13, a moving contact 23 arranged on the moving contact frame 22, an incoming line static contact 24 arranged in the contact box 21 and matched with the moving contact 23, and a contact module 20 arranged in the contact box 21. 21 and cooperate with the moving contact 23, one end of the outgoing static contact 25 of the three groups of contact modules 20 has three conductive parts 251 extending outside the contact box 21, and an insulating support cover 26 is arranged at the corresponding three conductive parts 251 in the base 10, and the insulating support cover 26 is separated between the three conductive parts 251 and the base 10, and three groups of temperature measuring components 40 are respectively arranged at the three wiring parts 252 corresponding to the three conductive parts 251 on the insulating support cover 26, and the temperature measuring component 20 includes a temperature sensing probe 41 arranged on the insulating support cover 26 at the corresponding wiring part 252, and a wiring nose 42 arranged on the insulating support cover 26 and in contact with the wiring part 252, the wiring nose 42 is connected to the temperature sensing probe 41, and the temperature sensing probe 41 is connected to the circuit board control module 15 through a wiring harness. The insulating support cover 26 is provided with a receiving groove 261 for placing the wire harness at a position corresponding to the temperature sensing probe 41, the receiving groove 261 is provided with a pressing plate 27 pressed against the wire harness, and the insulating support cover 26 is provided with a wiring groove 262 connected to the receiving groove 261. The insulating support cover is provided with receiving grooves and wiring grooves for wiring, thereby ensuring that the wiring of the wire harness is more neat and beautiful, and is conducive to improving the assembly efficiency of the temperature measuring component and the insulating support cover.

[0015] As shown Figures 2 to 4 in the figure, three exhaust channels 260 are respectively formed between the insulating support cover 26 and the base 10 corresponding to the three groups of contact modules 20, and exhaust holes 211 communicating with the three exhaust channels 260 are provided on the contact boxes 21 of the three groups of contact modules 20. The exhaust holes of the contact box communicate with the exhaust channels of the insulating support cover, which can ensure the rapid discharge of the high-pressure gas in the contact box, ensure the arc extinguishing performance of the contact module, and is beneficial to extending the service life of the contact module. Exhaust guiding grooves 263 matched with the contact boxes 21 of the three groups of contact modules 20 are respectively arranged in the insulating support cover 26. Clamping convex rings 212 are arranged on the contact boxes 21 of the three groups of contact modules 20 corresponding to the exhaust holes 211, and buckling grooves 264 matched with the clamping convex rings 212 are arranged in the exhaust guiding grooves 263. The clamping convex rings 212 are clamped in the buckling grooves 261, and the contact boxes 21 of the three groups of contact modules 20 and the insulating support cover 26 are clamped and matched. The insulating support cover and the contact box are assembled by a clamping and matching method, with higher assembly efficiency, and can ensure that the high-pressure gas in the contact box can quickly enter the exhaust guiding groove, which is beneficial to improving the working reliability of the reclosing residual current protection circuit breaker. The current transformer module 30 includes a zero-sequence current transformer 31 arranged on the insulating support cover 26, three metering current transformers 32 respectively arranged on the insulating support cover 26, and three protection current transformers 33 respectively arranged on the insulating support cover 26. The wiring parts 252 of the three conductive parts 251 sequentially pass through the zero-sequence current transformer 31, the three metering current transformers 32, and the three protection current transformers 33 and extend outside the insulating support cover 26. The current transformer module is integrated on the insulating support cover, which is beneficial to realizing the modular assembly of the current transformer module and the base, and has higher assembly efficiency.

[0016] The temperature measuring component adopts a modular structure design, which is convenient for the assembly of the temperature measuring component and the insulating support cover, with higher assembly efficiency. The temperature sensing probe contacts the wiring part through the wiring nose, and the contact between the wiring nose and the wiring part is more reliable, so that the temperature sensing probe can accurately monitor the temperature of the wiring part, and the temperature acquisition is more reliable. And the three contact modules are respectively independently arranged in the base, with better insulation performance between the three contact modules. The outgoing static contacts of the three contact modules have a conductive part with an integrated lead-out structure, with better conductivity and lower temperature rise. Therefore, the reclosing residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency, and accurate temperature measurement.

Claims

1. A reclosing residual current protection circuit breaker, comprising a base, a middle cover arranged on the base, a surface cover arranged on the middle cover, an operating mechanism arranged in the base, an automatic reclosing mechanism arranged in the middle cover and used to drive the operating mechanism to perform opening and closing actions, three groups of contact modules respectively arranged in the base and linked with the operating mechanism, a transformer module, and a circuit board control module arranged in the middle cover, characterized in that: The contact module includes a contact box arranged in the base, a movable contact frame rotatably arranged in the contact box and linked with the operating mechanism, a movable contact arranged on the movable contact frame, an incoming static contact arranged in the contact box and matched with the moving contact, and an outgoing static contact arranged in the contact box and matched with the moving contact. One end of the outgoing static contact of the three groups of contact modules has three conductive parts extending outside the contact box, and insulating support covers are arranged at the corresponding three conductive parts in the base, and the insulating support covers are separated between the three conductive parts and the base. Three groups of temperature measuring components are respectively arranged at the three wiring parts of the insulating support cover corresponding to the three conductive parts, and the temperature measuring components include a temperature sensing probe arranged on the insulating support cover at the corresponding wiring part, and a wiring nose arranged on the insulating support cover and in contact with the wiring part. The wiring nose is connected to the temperature sensing probe, and the temperature sensing probe is connected to the circuit board control module through a wiring harness.

2. The reclosing residual current protection circuit breaker according to claim 1, characterized in that: A receiving groove for placing the wiring harness is arranged on the insulating support cover at a position corresponding to the temperature sensing probe, a pressing plate pressed against the wiring harness is arranged in the receiving groove, and a wiring groove connected to the receiving groove is arranged on the insulating support cover.

3. The reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that Three exhaust channels are formed between the insulating support cover and the base corresponding to the three groups of contact modules, and exhaust holes connected to the three exhaust channels are arranged on the contact boxes of the three groups of contact modules.

4. The reclosing residual current protection circuit breaker according to claim 3 is characterized in that : The insulating support cover is respectively provided with exhaust guide grooves matching with the contact boxes of the three groups of contact modules, and the contact boxes of the three groups of contact modules are provided with snap-fitting convex rings at the corresponding exhaust holes, and the exhaust guide groove is provided with a snap-fitting groove matching with the snap-fitting convex ring. The snap-fitting convex ring is snap-fitted in the snap-fitting groove, and constitutes the snap-fitting of the contact boxes of the three groups of contact modules and the insulating support cover.

5. The reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that The transformer module includes a zero-sequence transformer arranged on an insulating support cover, three metering transformers respectively arranged on the insulating support cover, and three protection current transformers respectively arranged on the insulating support cover. The connection parts of the three conductive parts pass through the zero-sequence transformer, the three metering transformers, and the three protection current transformers in sequence and extend outside the insulating support cover.

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