Modularized reclosing residual current protection circuit breaker

Abstract

The utility model relates to a modularized 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 control circuit board module, each mutual inductor module comprises a supporting cover, a zero sequence mutual inductor, three metering mutual inductors and three protection current mutual inductors, three exhaust channels are formed between the supporting cover and the base, the contact box is provided with exhaust holes communicated with the exhaust channels, one end of an outgoing line static contact of the three groups of contact modules is provided with three conductive parts extending out of the contact box, and the other end of the outgoing line static contact of the three groups of contact modules is provided with a power supply. One end of each of the three conductive parts is provided with a wiring part which sequentially passes through the zero sequence mutual inductor, the three metering mutual inductors and the three protection current mutual inductors and is exposed out of the supporting cover. The utility model has the advantages of simple structure, stable and reliable performance, good insulating property, low temperature rise, high assembly efficiency and modularization.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a modular 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 the molded case circuit breaker. After cooperating with the circuit breaker, it can remotely close, disconnect and re-lock the circuit breaker to achieve 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 achieved. The assembly efficiency is low and the production cost is high. In addition, the exhaust channel of the reclosing residual current protection circuit breaker is not separated from the conductive copper busbar, and the insulation performance is poor. In addition, the reclosing residual current protection circuit breaker also has the defects of complex structure, unreliable performance and high temperature rise. Summary of the invention

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

[0004] To achieve the above-mentioned purpose, the utility model adopts a modular 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 transformer module, and a control circuit board 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, and a contact module arranged in the contact box and An outgoing static contact cooperates with the moving contact, the transformer module includes a support cover arranged in the base, a zero-sequence transformer arranged on the support cover, three metering transformers respectively arranged on the support cover, and three protection current transformers respectively arranged on the support cover. Three exhaust channels are formed between the support cover and the base corresponding to the three groups of contact modules. The contact boxes of the three groups of contact modules are provided with exhaust holes connected to the three exhaust channels. One end of the outgoing static contact of the three groups of contact modules has three conductive parts extending outside the contact box, and one end of the three conductive parts has a wiring part that passes through the zero-sequence transformer, the three metering transformers, and the three protection current transformers in sequence and is exposed outside the support cover.

[0005] The beneficial effects of the above structure are: the contact module and the transformer module adopt a modular structure design, which is conducive to the modular assembly of the reclosing residual current protection circuit breaker, and the assembly efficiency is higher. The outlet static contact has a conductive part with an integrated lead-out structure, which has better conductivity and lower temperature rise. The exhaust channel can quickly discharge the high-pressure exhaust in the contact box, which is conducive to improving the arc extinguishing performance of the contact module and extending the service life of the contact module. The support cover isolates the exhaust channel from the conductive part, and the insulation performance is better. The three contact modules are independently arranged in the base, and the phase-to-phase insulation performance is better. Therefore, the reclosing residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, good insulation performance, low temperature rise, high assembly efficiency and modularization.

[0006] In particular, the support cover is provided with three positioning grooves for placing three metering transformers and three protection current transformers, and the support cover is provided with a cover body covering the three metering transformers and the three protection current transformers. The three metering transformers and the three protection current transformers are clamped in the positioning grooves of the support cover, so as to facilitate the assembly of the three metering transformers, the three protection current transformers and the support cover, and the cover body can enhance the insulation performance of the entire transformer module, which is conducive to improving the working reliability of the reclosing residual current protection circuit breaker.

[0007] In particular, the support cover is respectively provided with exhaust guide grooves matched with the contact boxes of the three groups of contact modules, the contact boxes of the three groups of contact modules are provided with snap-fitting convex rings at the corresponding exhaust holes, the exhaust guide groove is provided with a snap-fitting groove matched 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 with the support cover. The support cover and the contact box are assembled in a snap-fitting manner, which facilitates the assembly of the support cover and the contact box, and can ensure that the high-pressure gas in the contact box quickly enters the exhaust guide groove, which is conducive to improving the working reliability of the contact module.

[0008] In particular, three temperature sensing probes electrically connected to the control circuit board module are respectively arranged at the three wiring parts corresponding to the three groups of contact modules on the support cover, and three wiring noses are respectively arranged on the support cover, which are in contact with the three wiring parts of the three groups of contact modules and electrically connected to the three temperature sensing probes. The temperature sensing probe contacts the wiring part through the wiring nose, and the temperature sensing probe can accurately monitor the temperature of the wiring part, which is conducive to improving the temperature measurement accuracy of the reclosing residual current protection circuit breaker.

[0009] In particular, three plug rods matching with the support cover are respectively arranged in the base, three slots matching with the three plug rods are respectively arranged at one end of the support cover, the three plug rods are inserted in the three slots, three positioning convex strips are respectively arranged at the corresponding positions of the three plug rods in the base, and positioning grooves matching with the three positioning convex strips are respectively arranged on the lower end surface of the support cover, the three positioning convex strips are engaged in the three positioning grooves, and constitute the snap-fitting of the support cover and the base. The support cover and the base are assembled by snap-fitting, which is conducive to the modular assembly of the mutual inductor module and the base, and the assembly efficiency is higher.

[0010] In particular, the base is provided with stop blocks matched with the contact boxes of the three contact modules, and the contact boxes of the three contact modules are provided with stop grooves matched with the stop blocks, and the stop blocks are engaged in the stop grooves to form a snap fit between the contact boxes of the three contact modules and the base. The base and the contact box are assembled in a snap fit manner, which is conducive to the modular assembly of the contact modules and the base, and the assembly efficiency is higher.

[0011] In particular, three backup protection mechanisms that match the traction rod of the operating mechanism are respectively arranged on the three conductive parts of the three groups of contact modules. The backup protection mechanism includes a yoke arranged on the conductive part, a bracket arranged on the yoke, an armature that rotates on the bracket and matches the yoke, and a torsion spring arranged between the bracket and the armature. The bracket is respectively provided with two limit arms that abut against one end of the armature, and a trigger arm is arranged between the two corresponding limit arms on one end of the armature. The trigger arm moves with the armature and abuts against the traction rod, and forms a linkage between the traction rod and the armature. The backup protection mechanism is designed on the conductive part, and the structural design is more compact, the backup protection mechanism occupies less space, and it is convenient to assemble the conductive part and the backup protection mechanism, and the assembly is more convenient.

[0012] In particular, the basic shape of the cross section of the magnetic yoke is U-shaped, the conductive part is inserted into the slot of the magnetic yoke, and the magnetic yoke is provided with an attraction inclined surface matching the armature at both sides of the corresponding slot. The magnetic yoke adopts a U-shaped structural design, and the magnetic yoke is provided with an attraction inclined surface matching the armature, which can increase the attraction area of ​​the magnetic yoke and the armature, thereby ensuring that the magnetic yoke and the armature can be reliably attracted, which is conducive to improving the working reliability of the backup protection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stereogram of an embodiment of the utility model.

[0014] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0015] Figure 3 This is an exploded view of an embodiment of the utility model.

[0016] Figure 4 It is a three-dimensional diagram of the backup protection mechanism of the embodiment of the utility model.

[0017] Figure 5 It is a three-dimensional diagram of the support cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0018] like Figures 1 to 5As shown, the embodiment of the utility model is a modular 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 control circuit board 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 box 21 arranged in the contact box 21 and linked with the moving contact 23. The transformer module 30 comprises a supporting cover 31 arranged in the base 10, a zero-sequence transformer 32 arranged on the supporting cover 31, three metering transformers 33 respectively arranged on the supporting cover 31, and three protection current transformers 34 respectively arranged on the supporting cover 31. Three exhaust channels 300 are respectively formed between the supporting cover 31 and the base 10 corresponding to the three groups of contact modules 20. The contact boxes 21 of the three groups of contact modules 21 are provided with exhaust holes 211 connected to the three exhaust channels 300. One end of the static contact 25 of the three groups of contact modules 20 has three conductive parts 251 extending outside the contact box 21. One end of the three conductive parts 251 passes through the zero-sequence transformer 32, the three metering transformers 33, and the three protection current transformers 34 in sequence and has a wiring part 252 extending outside the supporting cover 31. The support cover 31 is provided with three positioning grooves 311 for placing three metering transformers 33 and three protection current transformers 34, and the support cover 31 is provided with a cover body 35 covering the three metering transformers 33 and the three protection current transformers 34. The three metering transformers and the three protection current transformers are clamped in the positioning grooves of the support cover, so as to facilitate the assembly of the three metering transformers, the three protection current transformers and the support cover, and the cover body can enhance the insulation performance of the entire transformer module, which is conducive to improving the working reliability of the reclosing residual current protection circuit breaker. The support cover 31 is respectively provided with exhaust guide grooves 312 that cooperate with the contact boxes 21 of the three groups of contact modules 20. The contact boxes 21 of the three groups of contact modules 20 are provided with snap-fitting protrusions 212 at the positions corresponding to the exhaust holes 211. The exhaust guide groove 312 is provided with a snap-fitting groove 313 that cooperates with the snap-fitting protrusions 212. The snap-fitting protrusions 212 are snap-fitted in the snap-fitting groove 313, and constitute the snap-fitting cooperation between the contact boxes 21 of the three groups of contact modules 20 and the support cover 31.The support cover and the contact box are assembled by snap-fitting, which facilitates the assembly of the support cover and the contact box and ensures that the high-pressure gas in the contact box quickly enters the exhaust guide groove, thereby facilitating the working reliability of the contact module.

[0019] like Figure 2 and 3 As shown, three temperature sensing probes 40 electrically connected to the control circuit board module 15 are respectively arranged at the three wiring parts 252 corresponding to the three groups of contact modules 20 on the support cover 21, and three wiring noses 41 are respectively arranged on the support cover 21, which are in contact with the three wiring parts 252 of the three groups of contact modules 20 and electrically connected to the three temperature sensing probes 40. The temperature sensing probe contacts the wiring part through the wiring nose, and the temperature sensing probe can accurately monitor the temperature of the wiring part, which is conducive to improving the temperature measurement accuracy of the reclosing residual current protection circuit breaker.

[0020] like Figure 3 As shown, three plug rods 101 matching with the support cover 31 are respectively arranged in the base 10, and three slots 314 matching with the three plug rods 101 are respectively arranged at one end of the support cover 31, and the three plug rods 101 are inserted in the three slots 314. Three positioning convex strips 102 are respectively arranged at the corresponding positions of the three plug rods 101 in the base 10, and positioning grooves 315 matching with the three positioning convex strips 102 are respectively arranged on the lower end surface of the support cover 31, and the three positioning convex strips 102 are engaged in the three positioning grooves 315, and constitute the snap-fitting of the support cover 31 and the base 10. The support cover and the base are assembled by snap-fitting, which is conducive to the modular assembly of the mutual inductor module and the base, and the assembly efficiency is higher. The base 10 is provided with stop blocks 103 matched with the contact boxes 21 of the three contact modules 20, and the contact boxes 21 of the three contact modules 20 are provided with stop grooves 213 matched with the stop blocks 103. The stop blocks 103 are engaged in the stop grooves 213, and the contact boxes 21 of the three contact modules 20 are connected to the base 10 by a snap fit. The base and the contact box are assembled by snap fit, which is conducive to the modular assembly of the contact module and the base, and the assembly efficiency is higher.

[0021] like Figures 2 to 4As shown, three backup protection mechanisms 50 are respectively arranged on the three conductive parts 251 of the three groups of contact modules 20, which are matched with the traction rod 131 of the operating mechanism 13. The backup protection mechanism 50 includes a yoke 51 arranged on the conductive part 251, a bracket 52 arranged on the yoke 51, an armature 53 rotating on the bracket 52 and matched with the yoke 51, and a torsion spring 54 arranged between the bracket 52 and the armature 53. The bracket 52 is respectively provided with two limit arms 521 that abut against one end of the armature 53, and a trigger arm 531 is arranged between the two limit arms 521 on one end of the armature 53. The trigger arm 531 moves with the armature 53 and abuts against the traction rod 131, and constitutes the linkage cooperation between the traction rod 131 and the armature 53. The backup protection mechanism is designed on the conductive part, and the structural design is more compact, the backup protection mechanism occupies less space, and it is convenient to assemble the conductive part and the backup protection mechanism, and the assembly is more convenient. The cross-section of the yoke 51 is basically U-shaped, the conductive portion 251 is inserted into the slot 510 of the yoke 51, and the yoke 51 is provided with an attraction slope 511 matching the armature 53 at both sides of the slot 510. The yoke adopts a U-shaped structure design, and the yoke is provided with an attraction slope matching the armature, which can increase the attraction area of ​​the yoke and the armature, thereby ensuring that the yoke and the armature can be reliably attracted, which is conducive to improving the working reliability of the backup protection mechanism.

[0022] The contact module and the transformer module adopt a modular structure design, which is conducive to the modular assembly of the reclosing residual current protection circuit breaker, and the assembly efficiency is higher. The outgoing static contact has a conductive part with an integrated lead-out structure, which has better conductivity and lower temperature rise. The exhaust channel can quickly discharge the high-pressure exhaust gas in the contact box, which is conducive to improving the arc extinguishing performance of the contact module and extending the service life of the contact module. The support cover isolates the exhaust channel from the conductive part, and the insulation performance is better. The three contact modules are independently arranged in the base, and the phase-to-phase insulation performance is better. Therefore, the reclosing residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, good insulation performance, low temperature rise, high assembly efficiency and modularization.

Claims

1. A modular 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 control circuit board 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. The transformer module includes a support cover arranged in the base, a zero-sequence transformer arranged on the support cover, three metering transformers respectively arranged on the support cover, and three protection current transformers respectively arranged on the support cover. Three exhaust channels are respectively formed between the support cover and the base corresponding to the three groups of contact modules. The contact boxes of the three groups of contact modules are provided with exhaust holes connected with the three exhaust channels. One end of the outgoing static contact of the three groups of contact modules has three conductive parts extending outside the contact box, and one end of the three conductive parts has a wiring part that passes through the zero-sequence transformer, three metering transformers, and three protection current transformers in sequence and is exposed outside the support cover.

2. The modular reclosing residual current protection circuit breaker according to claim 1, characterized in that: The support cover is respectively provided with three positioning grooves for placing three metering transformers and three protection current transformers, and the support cover is provided with a cover body covering the three metering transformers and the three protection current transformers.

3. The modular reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that: The 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 a snap-fitting cooperation between the contact boxes of the three groups of contact modules and the support cover.

4. The modular reclosing residual current protection circuit breaker according to claim 3 is characterized in that: Three temperature sensing probes electrically connected to the control circuit board module are respectively arranged at the three wiring parts corresponding to the three groups of contact modules on the support cover, and three wiring noses in contact with the three wiring parts of the three groups of contact modules and electrically connected to the three temperature sensing probes are respectively arranged on the support cover.

5. The modular reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that: The base is respectively provided with three plug rods matching with the support cover, one end of the support cover is respectively provided with three slots matching with the three plug rods, the three plug rods are inserted into the three slots, three positioning ridges are respectively provided at the positions corresponding to the three plug rods in the base, and the lower end surface of the support cover is respectively provided with positioning grooves matching with the three positioning ridges, the three positioning ridges are snapped into the three positioning grooves, and constitute a snap-fit ​​between the support cover and the base.

6. The modular reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that: The base is respectively provided with limit blocks that cooperate with the contact boxes of the three groups of contact modules, and the contact boxes of the three groups of contact modules are respectively provided with limit grooves that cooperate with the limit blocks. The limit blocks are engaged in the limit grooves, and constitute the snap-fit ​​cooperation between the contact boxes of the three groups of contact modules and the base.

7. The modular reclosing residual current protection circuit breaker according to claim 1 or 2, characterized in that : Three backup protection mechanisms cooperating with the traction rod of the operating mechanism are respectively arranged on the three conductive parts of the three groups of contact modules. The backup protection mechanisms include a yoke arranged on the conductive part, a bracket arranged on the yoke, an armature rotating on the bracket and cooperating with the yoke, and a torsion spring arranged between the bracket and the armature. Two limit arms abutting against one end of the armature are respectively arranged on the bracket, and a trigger arm is arranged between the two corresponding limit arms on one end of the armature. The trigger arm moves with the armature and abuts against the traction rod, and constitutes a linkage cooperation between the traction rod and the armature.

8. The modular reclosing residual current protection circuit breaker according to claim 7, characterized in that The basic shape of the cross section of the magnetic yoke is U-shaped, the conductive part is inserted into the slot body of the magnetic yoke, and the magnetic yoke is provided with attraction inclined surfaces matching with the armature at both sides of the slot body.

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