KR20180079048A - Molded Case Circuit Breaker for DC - Google Patents

Abstract

The present invention relates to a DC interrupter. More specifically, the present invention relates to the DC interrupter for enhancing insulation performance and assemblability and reducing an occupied space by incorporating a connection conductor connecting adjacent terminals of the DC interrupter. The DC interrupter for DC wiring according to an embodiment of the present invention comprises a DC interconnection breaker including a plurality of breaker units and a second unit connection heater for connecting front side fixed contacts of an adjacent pair of units. Further, the present invention is characterized in which the second unit connection heater is provided inside a circuit breaker enclosure.

Description

{Molded Case Circuit Breaker for DC}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a DC interrupter, more particularly, to a DC interrupter for enhancing insulation performance and assemblability and reducing an occupied space by incorporating a connection conductor connecting adjacent terminals of the DC interconnection interrupter .

In general, a molded case circuit breaker (MCCB) is an electric device that protects a circuit and a load by automatically shutting off a circuit in the event of an electric overload condition or a short circuit, and is mainly composed of a terminal portion for connecting the power source side and the front side, A trip unit that detects the overcurrent or short-circuit current on the power supply side to induce the tripping of the mechanism, and an arc that occurs when the abnormal current is cut off. And a soho department for the soho.

Such a circuit breaker is generally used for alternating current but can be used for switching to direct current. In order to use an alternating-current DC wiring breaker for direct current conversion, a circuit is connected in series to a front side terminal portion and a power source side terminal portion of a conventional wiring breaker using a connecting conductor (external connecting conductor).

FIG. 1 is a perspective view of a conventional 4-pole circuit breaker according to the prior art, and FIG. 2 is a perspective view of a 4-unit DC circuit breaker according to the prior art. 3 is an internal perspective view of FIG. The cover is partially cut, and the external connecting conductor is in a detached state. Fig. 4 is a perspective view of the trip portion in Fig. 3; Fig. Fig. 5 is an exploded perspective view of the trip mechanism, the terminal portion, and the external connecting conductor in Fig. 4; Fig. 6 shows a wiring diagram of a 4-unit DC wiring breaker according to the prior art.

The AC circuit breaker according to the prior art has an opening and closing mechanism 3, a contact portion 7, a trip portion 5 and a terminal portion 2a provided inside an enclosure consisting of a case 1a and a cover 1b, , 2b, 2c, 2d, 2e, 2f, 2g, 2h. Here, the internal structures other than the opening and closing mechanism 3 are provided for each phase. That is, in the case of the 4-unit wiring breaker, each component is provided with four R-phase, S-phase, T-phase, and N-phase. The terminal portions 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h are electrically connected to the front side terminal portions 2a, 2b, 2c, 2d provided on the front face of the circuit breaker and the power source side terminal portions 2e , 2f, 2g, 2h). (For ease of understanding, each unit will be described using the R phase, S phase, T phase, and N phase of the AC interrupter.)

The external connecting conductors 4a and 4b are coupled to the power source side terminal portions 2e, 2f, 2g, and 2h or the front side terminal portions 2a, 2b, 2c, and 2d in order to use the circuit breaker for direct current. 3 shows an example of a DC wiring breaker to which an external connecting conductor is connected. The front side terminal portions 2a, 2b, 2c, and 2d are provided with a plurality of U-shaped external connecting conductors 4a connecting the pair of terminals. In this example, the N phase front side terminal portion 2a and the R phase front side terminal portion 2b are connected by a U-shaped external connecting conductor 4a, and the S phase front side terminal portion 2c and the T phase front side terminal portion 2d Is connected by a U-shaped external connecting conductor 4a. The power source side terminal portions 2e, 2f, 2g, and 2h may be connected to a straight type external connecting conductor 4b for each phase. An insulating barrier 6 is provided between the external connection conductors 4a and 4b in the power source side terminal portions 2e, 2f, 2g and 2h and the front side terminal portions 2a, 2b, 2c and 2d.

3 to 5, the trip unit 5 includes a cross bar 5b provided across the trip unit case 5a, a heater connected to the front side fixed contact (not shown) of the contact unit 7, A bimetal 5c which is bent by the heat generated by the heater 5d when the overcurrent is generated in the circuit and presses the contact portion 5b1 to rotate the crossbar 5b and a magnet 5e having a magnetic force, An armature 5f rotating in the direction of the magnet 5e, a trip spring 5g, and the like. Here, a trip mechanism including the heater 5d, the bimetal 5c, the magnet 5e, the armature 5f, and the trip spring 5g is provided for each phase. The front side terminal portions 2a, 2b, 2c, and 2d may be connected to the heater 5d, respectively.

Fig. 5 shows a U-shaped external connecting conductor 4a connecting a pair of trip mechanisms, a pair of terminal portions, and a pair of terminal portions. The U-shaped external connecting conductor 4a serves to connect an adjacent pair of terminals.

6 shows a wiring diagram of a DC interrupter according to the prior art. The U-shaped external connecting conductor 4a is coupled to the front side terminal portions 2a, 2b, 2c, and 2d so as to connect a pair of adjacent terminals. The load 8 and the power sources 9a and 9b are connected to the power source side terminal portions 2e, 2f, 2g, and 2h.

In the DC interrupter according to the prior art, the external connecting conductor 4a must be separately provided. As a result, an additional work is required, and the insulating performance is lowered due to exposure to the outside. Further, since the housing is configured outside the enclosure, the space occupied by the housing is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to provide a DC interrupter for a DC interconnection breaker, in which a built-in connecting conductor is embedded to improve assembling property and insulation performance, .

A DC interrupter for DC wiring according to an embodiment of the present invention is a DC interrupter for a DC interconnection including a plurality of circuit breaker units, wherein the DC interrupter includes a 2-unit connection heater connecting the front-side fixed contacts of the adjacent pair of units, And the heater is provided inside the breaker enclosure.

Here, the 2-unit connection heater includes a pair of head portions formed in a U-shape and connected to front-side fixed contacts of the adjacent pair of units, a pair of body portions extending downward from the head portion, And a leg portion connecting the pair of body portions.

In addition, the head and the leg are formed in a horizontal plane, and the body is formed in a vertical plane.

In addition, the body portion has a bent shape.

In addition, a center hole is formed at a portion where the head portion and the body portion are in contact with each other and at a portion where the body portion and the leg portion are in contact with each other.

Further, an assembly hole is formed in the leg portion.

In addition, a trip mechanism may be installed on any one of the pair of body portions.

Further, an insulating cover for closing the front-side terminal accommodating portion is provided.

In addition, a trip portion insulating cover is provided in the trip portion, which is provided in order to cut off the circuit when an overcurrent is generated in the circuit of each phase.

The two-unit connection heater is installed in the trip unit.

According to the DC interrupter of the embodiment of the present invention, the U-shaped two-unit connection heater is provided so as to connect a pair of adjacent units, thereby eliminating the need for a separate external connection conductor. Therefore, it is unnecessary for the user to add the connection conductors incidentally, and the assemblability of the power source and the load is improved.

Also, since the connecting conductors are formed inside the enclosure, the external insulation breakdown is prevented. In addition, the front side terminal portion is removed to improve the insulation performance and reduce the occupied space.

Further, since the trip mechanism is reduced, parts and production costs are reduced.

1 is a perspective view of a four-pole wiring breaker according to the prior art.
2 is a perspective view of a conventional 4-unit DC wiring breaker.
3 is an internal perspective view of FIG. The cover is partially cut, and the external connecting conductor is in a detached state.
Fig. 4 is a perspective view of the trip portion in Fig. 3; Fig.
Fig. 5 is an exploded perspective view of the trip mechanism, the terminal portion, and the external connecting conductor in Fig. 4;
6 is a wiring diagram of a conventional 4-unit DC wiring breaker.
7 and 8 are front and rear perspective views of a DC interrupter according to an embodiment of the present invention.
9 is a perspective view showing the state where the external connecting conductor is coupled in FIG.
10 is a perspective view of a state in which a part of the cover is cut in Fig.
11 and 12 are perspective views of a base assembly and a trip unit assembly applied to a DC interrupter according to an embodiment of the present invention.
13 is a perspective view of a two-unit connection heater applied to a DC interrupter according to an embodiment of the present invention.
FIG. 14 is a perspective view of a two-unit connecting heater applied to a DC interrupter according to an embodiment of the present invention, in which a trip mechanism is coupled.
15 is a wiring diagram of a DC wiring breaker according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.

The DC interrupter according to each embodiment of the present invention will now be described in detail with reference to the drawings.

A DC interrupter for a DC wiring breaker comprising a plurality of breaker units, comprising a two-unit connection heater (41) for connecting front-side fixed contacts (33b) of an adjacent pair of phases, As shown in FIG.

FIGS. 7 and 8 are front and rear perspective views of a DC interrupter according to an embodiment of the present invention, and FIG. 9 is a perspective view showing the state where the external connection conductor is coupled in FIG. 10 is a perspective view of a state in which a part of the cover is cut in Fig.

A DC interrupter according to an embodiment of the present invention includes a plurality of circuit breaker units. Here, the breaker unit corresponds to the breaker unit applied to each phase (pole) of the AC wiring breaker. Therefore, for the sake of convenience, the R-phase, S-phase, T-phase, and N-phase will be used for a 4-unit wiring breaker. The 4-unit DC wiring breaker 10 according to an embodiment of the present invention includes a case 11 and a cover 18 constituting an enclosure, an opening and closing mechanism 30 for providing an opening and closing driving force, A trip unit assembly 40 provided on the front side of the base assembly 35, and a two unit connection heater 41. [

The case 11 forms the lower part of the enclosure. The case 11 may be formed in a box shape in which the upper surface and a part of the front and rear surfaces are open. The base assembly 35 is accommodated in the inner space of the case 11. In the case of the 4-unit wiring breaker, four units of R-phase, S-phase, T-phase, and N-phase circuits are provided so that four base assemblies 35 are accommodated. The case 11 can be divided into four sections. 7 shows an example in which N-phase, R-phase, S-phase, and T-phase are provided from the right side. The front and rear portions of the case 11 are provided with a front terminal receiving portion 12 and a rear terminal receiving portion 13, respectively. The front terminal receiving portion 12 and the rear terminal receiving portion 13 provide a space in which the load terminal portion or the power terminal portion can be installed, respectively. The terminal accommodating portion on one of the surfaces (the front surface in the present embodiment) is left empty.

The cover 18 is coupled to the upper portion of the case 11. The upper surface of the cover 18 is partly opened, and the top cover 19 is mounted. The handle 31 of the opening / closing mechanism 30 is exposed in the center hole of the top cover 19, so that the user can manually apply the operating force.

The front terminal receiving portion 12 can be closed by the insulating cover 15. [ Since the terminal is not provided in the front terminal accommodating portion 12, the front cover is closed by the insulating cover 15 to improve the insulation performance. 10 shows a state in which the terminal is not installed by removing the insulating cover 15 on a part of the front terminal receiving portion 12. [

The rear terminal accommodating portion 13 is provided with terminals for each phase. That is, the N-phase terminal 36a, the R-phase terminal 36b, the S-phase terminal 36c, and the T-phase terminal 36d are provided in the respective terminal accommodating portions.

9 and 10 show that the external extension conductor 20 is coupled to each terminal. The external extension conductor 20 is provided to facilitate coupling of the positive and negative terminals of the power source 60a, 60b or the load 70. [

An insulating barrier 25 may be provided between the outer extension conductors 20. The insulating barrier 25 improves the inter-phase insulation performance.

The base assembly 35 and the trip unit assembly 40 will be described with reference to FIGS. 10 to 12. FIG. The base assembly 35 is provided for each phase. In the case of the 4-unit wiring breaker, four base assemblies 35 to be applied to each phase of N phase, R phase, S phase, and T phase are arranged in parallel. The base assembly 35 is provided with a contact portion inside the base mold 39 formed of a molded article. The contact portion includes fixed contacts 33a and 33b and a movable contact 34. [ 11, a pair of fixed contacts constituted by a rear-side fixed contact 33a and a front-side fixed contact 33b in the case of a two-contact type, a pair of movable contacts 34 symmetrically formed, . The rear-side stationary contact 33a is connected to each phase terminal 36a, 36b, 36c, 36d. The rear-side fixed contact 33a and the terminals 36a, 36b, 36c, and 36d of the respective phases may be integrally formed. Each of the phase terminals 36a, 36b, 36c and 36d protrudes from one side (rear side) of the base assembly 35 and is connected to the rear terminal receiving portion 13 when the base assembly 35 is engaged with the case 11. [ Lt; / RTI > N phase terminal 36a and T phase terminal 36d may be connected to the power sources 60a and 60b among the phase image terminals 36a, 36b, 36c and 36d. The R phase terminal 36b and the S phase terminal 36c may be connected to the load 70. [

A pair of movable contacts 34 are symmetrically installed on the shaft 37 and rotate with the shaft 37. Each of the shafts 37 is connected by the shaft pin 38 and rotates together, so that the contact portions of the four units are simultaneously opened and closed. The opening and closing mechanism 30 transfers operating force to a base assembly 35 of any one phase, typically a shaft pin 38 mounted on an S phase base assembly and coupled to a portion of the opening and closing mechanism 30. The operation of the movable contact and the opening / closing mechanism 30 is the same as that of the conventional art, and thus a detailed description thereof will be omitted.

The trip unit assembly 40 is installed on the front side of the base assembly 35. The trip unit assembly 40 detects a overcurrent flowing through the circuit to cause a tripping action. The trip unit case 40 includes a trip unit case 45, a two-unit connection heater 41 connected to a pair of adjacent front-side stationary contacts, The bimetal 42 rotatable by the bimetal 42 and the cross bar 43 are rotated to cause the nail 32 of the opening and closing mechanism 30 to strike the opening and closing mechanism 30 (Not shown) may be turned off.

The crossbar 43 is provided with a plurality of contact portions 43a and 43c projected to be in contact with the bimetal. The contact portion can be formed on only two phases. For example, the first contact portion 43a is formed on either the S phase or the T phase, and the second contact portion 43c is provided on either the N phase or the R phase. That is, the contact portion may not be provided on the other of the S phase or the T phase and the other one of the N phase or the R phase.

The trip mechanism is provided commonly to a pair of phases (units). For example, a pair connecting the N phase and the R phase, and a pair connecting the S phase and the T phase, respectively.

The trip portion case 45 is provided with a partition 45a for inter-phase insulation. The barrier ribs 45a may be formed as double walls for improving insulation performance. A portion of the partition wall 45a is partially cut to form a cutout groove 45b. The leg portion 41c of the two unit connecting heater 41 may be inserted into the cutout groove 45b.

The trip portion insulating cover 50 is provided on the front surface of the trip portion case 45. Since the trip portion is insulated by the trip portion insulative cover 50, the insulation performance is improved. Since the double-wall is formed in the front terminal receiving portion 12 by the insulating cover 15 and the trip insulating cover 50, the insulating performance is greatly improved.

12 and 13, the two-unit connection heater 41 is provided for connecting the front-side fixed contacts of the pair of adjacent phases (for example, S phase and T phase). The two-unit connection heater 41 is formed in a U-shape. One end of the two-unit connection heater 41 is connected to the front-side fixed contact 33b of one of the pair of adjacent phases (for example, S phase), and the other end of the two- And is connected to the front side fixed contact 33b of another phase (for example, T phase) of the pair of phases. A trip mechanism component may be provided on one side (either S phase or T phase) of the two unit connection heater 41. [ That is, among the trip mechanisms, the components such as the fixing bracket 47, the magnet 48, the armature 49, the trip spring 46 and the like except for the heater may be any one of a pair of adjacent phases S phase), and may not be provided in another phase (for example, T phase) of the pair of adjacent phases.

The two unit connection heater 41 includes a pair of head portions 41a that can be connected to a pair of adjacent front side fixed contacts 33b, a body portion 41b extending downward from the head portion 41a, And a leg portion 41c connecting the pair of body portions 41b. Here, the head portion 41a and the leg portion 41c may have a horizontal plane, and the body portion 41b may have a vertical plane. The body portion 41b may be partially bent to maintain a predetermined gap with the trip mechanism. The center holes 41d and 41e may be formed at portions where the head portion 41a and the body portion 41b are in contact with each other and where the body portion 41b and the leg portion 41c are in contact with each other to improve strength and bend formation . Further, the leg portion 41c may be provided with an assembly hole 41f to be coupled to the trip portion.

The pair of adjacent phases (for example, S phase and T phase) are connected by the two unit connection heater 41, so that one heater can cover the two phases. Further, the two-unit connection heater 41 serves as a conduction of current. Further, the two-unit connection heater 41 does not need to have a front-side terminal.

The adjacent pair of phases are directly connected by the two-unit connection heater 41, so that the external connecting conductor connecting the adjacent pair of terminals becomes unnecessary, and the terminal is not exposed to the outside of the front terminal accommodating portion 12. [ Therefore, it contributes to the improvement of the insulation performance.

In addition, since no terminal is provided in the front terminal receiving portion 12, there is no element exposed to the outside, so that the front terminal receiving portion 12 can be closed by the insulating cover 15. As a result, the insulation performance is further improved.

Further, since the trip mechanism (46A: 46, 47, 48, 49) is provided only on one of the pair of adjacent phases, the parts are saved and the cost is reduced.

Referring to FIG. 15, a wiring diagram of a 4-unit DC wiring breaker according to an embodiment of the present invention will be described.

The power supplies 60a and 60b and the load 70 are connected to terminals of respective phases provided on the rear surface of the DC interrupter 10. For example, the plus pole 60a of the power sources 60a and 60b is connected to the T phase terminal 36a and the minus pole of the power sources 60a and 60b is connected to the N phase power side terminal 36b . The anode of the load 70 is connected to the S phase terminal 36c and the cathode of the load 70 is connected to the R phase terminal 36b.

In order to connect the adjacent pair of phases, a two unit connection heater 41 is coupled to the adjacent pair of front-side fixed contacts. The pair of adjacent phases are directly connected by the two-unit connection heater 41, so that the front-side terminal and the external connecting conductor are unnecessary. Further, since the two-unit connection heater 41 is embedded inside the enclosure of the DC interrupter 10, it is shielded from the outside, and the insulation performance is improved.

The trip mechanism 46A is provided in only one pair of adjacent phases (units).

According to the DC interrupter of the embodiment of the present invention, the U-shaped two-unit connection heater is provided so as to connect a pair of adjacent units, thereby eliminating the need for a separate external connection conductor. Therefore, it is unnecessary for the user to add the connection conductors incidentally, and the assemblability of the power source and the load is improved.

Also, since the connecting conductors are formed inside the enclosure, the external insulation breakdown is prevented. In addition, the front side terminal portion is removed to improve the insulation performance and reduce the occupied space.

Further, since the trip mechanism is reduced, parts and production costs are reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. That is, the scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

10 DC circuit breaker 11 case
12 front side terminal accommodating portion 13 rear side terminal accommodating portion
15 Insulation cover 18 Cover
19 Top cover 20 Outer extension conductor
25 Insulation barrier 30 Opening and closing mechanism
31 Handle 32 Nail
33a Rear side fixed contact 33b Front side fixed contact
34 movable contacts 35 base assembly
36a, 36b, 36c, 36d Terminal 37 Shaft
38 Shaft pin 39 Base mold
40 Trip unit assembly 41 2 Unit connection heater
41a head portion 41b body portion
41c leg portion 41d, 41e center hole
41f assembly hole 42 bimetal
43 crossbar 43a, 43c first and second contact portions
44 Shooter 45 Tripping case
45a partition wall 45b incision groove
46 Trip spring 47 Retaining bracket
48 Magnet 50 Trip Insulation cover
60a, 60b Power supply 70 Load

Claims (11)

A DC interrupter comprising a plurality of breaker units,
And a two-unit connection heater for connecting front-side fixed contacts of a pair of adjacent units,
Wherein the two unit connection heater is provided inside the circuit breaker enclosure. The apparatus of claim 1, wherein the two-unit connection heater comprises a pair of head portions formed in a U-shape and connected to front-side fixed contacts of the adjacent pair of units, And a leg portion connecting the pair of body portions. The circuit breaker of claim 2, wherein the head portion and the leg portion are formed in a horizontal plane, and the body portion is formed in a vertical plane. The circuit breaker of claim 3, wherein the body is partially bent. The circuit breaker of claim 2, wherein a central hole is formed in a portion where the head portion and the body portion are in contact with each other and a portion where the body portion and the leg portion are in contact with each other. The circuit breaker of claim 2, wherein an assembly hole is formed in the leg portion. 3. The circuit breaker of claim 2, wherein a trip mechanism is provided in any one of the pair of body portions to detect an overcurrent generated in the circuit and cut off the circuit. The circuit breaker of claim 1, further comprising an insulating cover for closing the front-side terminal accommodating portion. The circuit breaker of claim 7, wherein a trip portion insulating cover is provided on a front surface of the trip portion case that accommodates the trip mechanism. 10. The circuit breaker of claim 9, wherein the 2-unit connection heater is installed in the trip unit case. 10. The circuit breaker of claim 9, wherein the trip unit case is provided with a partition wall for insulation between the units, and a part of the partition wall is formed with a cutout groove into which the two unit connection heaters can be partially inserted.

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