KR20160130052A - Detecting unit for trip driving of circuit breaker - Google Patents

Detecting unit for trip driving of circuit breaker Download PDF

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Publication number
KR20160130052A
KR20160130052A KR1020150062033A KR20150062033A KR20160130052A KR 20160130052 A KR20160130052 A KR 20160130052A KR 1020150062033 A KR1020150062033 A KR 1020150062033A KR 20150062033 A KR20150062033 A KR 20150062033A KR 20160130052 A KR20160130052 A KR 20160130052A
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KR
South Korea
Prior art keywords
contact
switch
circuit breaker
trip
trip driving
Prior art date
Application number
KR1020150062033A
Other languages
Korean (ko)
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KR101734229B1 (en
Inventor
유재구
Original Assignee
현대중공업 주식회사
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Filing date
Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020150062033A priority Critical patent/KR101734229B1/en
Priority to CN201610284171.0A priority patent/CN106098488B/en
Publication of KR20160130052A publication Critical patent/KR20160130052A/en
Application granted granted Critical
Publication of KR101734229B1 publication Critical patent/KR101734229B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/128—Manual release or trip mechanisms, e.g. for test purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition

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  • Breakers (AREA)

Abstract

According to the embodiment of the present invention, a driving detecting unit of a circuit breaker is a detecting unit to detect a trip driving of a circuit breaker which releases a locking of a movable contact to allow the movable contact formed in a breaking part to move in accordance with a control signal of an overcurrent protection relay. The driving detecting unit may comprise: a moving member formed in the trip driving unit and coupled to the moving part which moves linearly in accordance with the control signal, moving together with the moving part; and a contact switch pressed by the moving member and switched to an on state. As such, a normal operation of the trip driving is able to be checked from the outside of the circuit breaker.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker,

The present invention relates to a trip drive sensing unit for a circuit breaker.

Generally, circuit breaker is an industrial power device that automatically cuts off the line when a fault current such as an overcurrent or a short-circuit current is generated in a transmission line having a relatively low voltage and extinguishes an arc generated when the line is broken by using compressed air.

The circuit breaker largely performs a closing operation for closing the energizing circuit and a closing operation for opening the energizing circuit. The charging and discharging operations of the circuit breaker are generally performed automatically or according to the user's selection according to the state of the energizing circuit.

As disclosed in the prior art document, when a fault current is detected in an over current relay (OCR) provided inside the OCR, the circuit breaker excites the trip coil of the circuit breaker to mechanically lock ) Is released, and the movable contact moves by the spring force inside, and the movable contact and the fixed contact are separated from each other.

However, in the related art, there is a disadvantage that the OCR is difficult to confirm from the outside of the circuit breaker whether the trip driving process of exciting the trip coil of the circuit breaker is normally performed.

Korean Patent Publication No. 10-2009-0016323

SUMMARY OF THE INVENTION It is an object of the present invention to provide a trip driving detection unit which can confirm the normal operation of trip driving from the outside of a circuit breaker.

The trip driving sensing unit of the circuit breaker according to the embodiment of the present invention is driven by a control signal of an overcurrent protection relay to perform a tripping operation for releasing the locking of the movable contact so that the movable contact, A moving unit provided in the trip driving unit and coupled to the moving unit moving linearly according to the control signal and moving together with the moving unit; And a contact switch that is switched to an ON state by the moving member.

In the present embodiment, it further includes a switch bracket coupled to both sides of the contact switch, and the switch bracket may be fixedly coupled to the trip driving unit.

In this embodiment, the moving member includes: a main body disposed in the switch bracket; And a sliding block protruding from the main body and inserted and arranged to be movable in a movable slit formed in the switch bracket.

In the present embodiment, the moving member further includes a pressing protrusion projecting from the main body toward the contact switch, and the pressing protrusion presses the contact switch as the moving member moves to turn on the contact switch On state.

In this embodiment, the contact switch may include a switch body, a contact plate protruding outward from the switch body, and a contact pressed by the contact plate to internally form a short circuit.

In this embodiment, as the movable member moves, the pressing projection presses the contact plate of the contact switch to elastically deform the contact plate, and the elastically deformed contact plate can press the contact.

In the present embodiment, the contact switch may include a plurality of connection terminals connected to an alarm system disposed outside the circuit breaker.

In the present embodiment, the moving member may further include a driving shaft protruding downward from the main body and coupled to the movable portion of the trip driving unit.

The trip driving sensing unit of the circuit breaker according to the present invention can inform the operator that the trip driving unit has been normally operated when an abnormality occurs in the circuit breaker so that the operator can easily grasp the internal state of the circuit breaker.

Further, since the trip driving sensing unit is interlocked with the trip driving unit through a mechanical coupling, high operating reliability can be provided.

1 is a schematic perspective view showing the inside of a circuit breaker including a trip driving unit according to an embodiment of the present invention;
2 is an exploded perspective view of the circuit breaker shown in Fig.
3 is an exploded perspective view of a trip driving unit and a trip driving sensing unit according to an embodiment of the present invention;
4A to 5C are perspective views for explaining the operation of the trip driving unit according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

FIG. 1 is a schematic perspective view showing the inside of a circuit breaker including a trip driving sensing unit according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the circuit breaker shown in FIG.

1 and 2, a circuit breaker 100 according to an embodiment of the present invention includes an overcurrent protection relay 120, a blocking unit 170, a trip driving unit 150, and a trip driving detection unit .

The overcurrent protection relay 120 (hereinafter referred to as OCR) is a current reference value for determining whether or not an abnormal current is supplied, for example, a current value that is not too large with respect to a rated current and permits a temporary energization, A setting dial (dial) for setting a current value, a short-circuit current value and the like to be instantaneously interrupted is compared with the set reference current value and the detected current value on the circuit to determine whether or not to perform a trip operation. And an electronic circuit unit such as a microprocessor that outputs a control signal for instructing a trip operation upon determination. Since the function and the configuration of the overcurrent trip relay 120 are well known, they are not directly related to the present invention, so a detailed description thereof will be omitted.

The blocking unit 170 moves the movable break point (not shown) of the circuit breaker 100 through the operation of the trip driving unit 150 (to be described later) or the manual input of the operator so as to contact or disconnect the fixed contact . Since the contact / separation structure of the movable contact point and the stationary contact point is also a well-known technique, only the part directly related to the present invention will be described.

The blocking portion 170 according to this embodiment may include a trip rod 172, a latching protrusion 174, and a latch lock portion 176, as shown in FIG.

The trip rod 172 rotates by the drive of the trip driving unit or by the manual operation and as the trip rod 172 rotates, the latch release 176 fastened to the trip rod 172 rotates together, Not shown) in a rotatable state.

Due to the rotation of the latch, the movable contact of the circuit breaker 100 is released from the locked state, whereby the movable contact is disconnected from the fixed contact and the circuit is interrupted.

The latching protrusion 174 is fastened to the trip rod 172 and is rotated by driving the trip driving unit 150, which will be described later. This will be described in more detail in the trip driving unit 150 described later.

The trip driving unit 150 provides a mechanical trigger signal for trip driving the opening / closing mechanism 30 by a trip driving control signal from the overcurrent trip relay 120. [

FIG. 3 is an exploded perspective view of a trip driving unit and a trip driving sensing unit according to an embodiment of the present invention. Referring to FIG. 3, the trip driving unit 150 according to the present embodiment includes a movable portion A trip coil 152 having a movable portion 154, and a rotating plate 156 rotating in correspondence with the movement of the movable portion 154.

It may also include a coil bracket 162 and a plate bracket 164 for securing each element to the circuit breaker 100.

The coil bracket 162 is fixed to the main body of the circuit breaker 100, and the trip coil 152 is seated and fastened therein. Therefore, the shape of the coil bracket 162 is not limited as long as it can stably fix the trip coil 152.

The plate bracket 164 is disposed under the coil bracket 162 and fixedly connected to the circuit breaker 100. The upper portion of the plate bracket 164 may also be fastened to the coil bracket 162.

A rotation plate 156 is rotatably coupled to the plate bracket 164. More specifically, the rotating plate 156 can be coupled to the plate bracket 164 by a rotating shaft 151.

The rotating shaft 151 penetrates the rotating plate 156 together and both ends thereof are coupled to the plate bracket 164. The rotary plate 156 is rotatably coupled to the plate bracket 164 with the rotary shaft 151 as a rotation axis.

The trip coil 152 receives the control signal instructing the trip operation from the overcurrent protection relay 120 to move the movable part 154.

To this end, the trip coil 152 may be a solenoid coil. The movable portion 154 is formed in a shaft shape and one end of the movable portion 154 is inserted into the trip coil 152 and reciprocates linearly by the electromagnetic force generated in the trip coil 152.

An insertion groove 155 is formed in a portion of the movable portion 154 that is exposed to the outside of the trip coil 152.

The insertion groove 155 is a groove into which the insertion projection 157 of the rotation plate 156 and a drive shaft 41 formed in the moving member 40 of the trip driving sensing unit 30 are inserted. Therefore, the insertion groove 155 can be formed as a groove having a width and a depth allowing the insertion projection 157 and the drive shaft 41 to be inserted together.

The trip coil 152 is fastened to the coil bracket 162. Therefore, when the control signal indicating the trip operation is received from the overcurrent protection relay 120, the trip coil 152 moves only the movable part 154 without any trouble. At this time, the movable part 154 linearly moves along the longitudinal direction and protrudes to the outside. The rotation plate 156 inserted into the insertion groove 155 of the movable part 154 moves together with the movement of the movable part 154,

The rotary plate 156 is formed in a flat long rod shape and is disposed at one end in the insertion groove 155 of the movable portion 154 and the other end is rotatably coupled to the plate bracket 164. Therefore, when the movable portion 154 linearly moves, the movable portion 154 rotates with the rotary shaft 151 coupled to the other end as the rotary shaft.

The rotation plate 156 also includes a latching ring 158 that protrudes outward from the central portion. The latching ring 158 may be formed in a hook shape and is arranged to engage with a latching protrusion 174 fastened to the trip rod 172 of the blocking portion 170 shown in FIG.

When the rotation plate 156 is rotated, the latching ring 158 contacts the latching protrusion 174 and rotates the latching protrusion 174, and when the latching protrusion 174 rotates, The release 176 rotates together to open the latch of the blocking portion 170 in a rotatable state. Thus, the latch (not shown) is rotated and the movable contact is disconnected from the fixed contact to block the circuit.

The trip drive sensing unit 30 may include a contact switch 32, a switch bracket 38, and a shifting member 40.

The contact switch 32 includes a switch body 33, a contact plate 35 protruding outward from the body 33, a contact 36 pressed by the contact plate 35 to internally form a short circuit, And may include connection terminals 37.

The contact plate 35 protrudes outward from the switch body 33 and is elastically deformed as it is pressed by the movable member 40 to be contacted with the contact 36.

The contact (36 in Fig. 4C) is protruded from the switch body 33, inserted into the switch body 33 by an external force, and forms a short circuit inside the contact switch 32. [

Thus, when the contact plate 35 presses the contact 36, the contact switch 32 is switched to the On state. When the contact plate 35 is disconnected from the contact, And the contact switch 32 is switched to the OFF state.

The contact switch 32 also includes a plurality of connection terminals 37. The connection terminals 37 are portions where the contact switch 32 is connected to the outside. Therefore, electric wires or the like may be connected to the connection terminal 37, and the contact switch 32 may be electrically connected to the outside.

At this time, the connection terminal 37 can be electrically connected to an alarm system (not shown). Therefore, when the contact switch 32 is turned on, the alarm system is activated, and the operator can recognize that the trip driving unit 150 is driven in the circuit breaker 100.

The switch bracket 38 may be constructed by coupling two plates and is disposed on both sides of the contact switch 32 and coupled to each other in such a manner as to receive the contact switch 32 therein.

Either one of the switch brackets 38 may be partially bent and fixed to the coil bracket 162 of the trip driving unit 150. The switch bracket 38, the contact switch 32, and the movable member 40 can be integrally combined with the trip driving unit 150. [

At least one supporting frame (34 in Fig. 2) may be interposed between the switch brackets 38 disposed on both sides of the contact switch 32. [ The two switch brackets 38 can be integrally coupled by the support frame 34. [

The switch bracket 38 is also provided with a moving slit (39 in Fig. 3). The moving slit 39 provides a path through which the sliding block 42 of the moving member 40, which will be described later, is inserted and moved. Therefore, the moving slit 39 is formed to have a width corresponding to the size of the sliding block 42, and may be formed to have a length corresponding to the moving distance of the moving member 40.

The movable member 40 is disposed in the switch bracket 38 and includes a sliding block 42 inserted into the moving slit 39 of the switch bracket 38, (41), and a pressing projection (44) for pressing the contact plate (35).

The moving slit 39 defines a path through which the moving member 40 moves as described above.

The driving shaft 41 is protruded downwardly in the form of a pin in the main body 43 of the moving member 40 and the end is disposed in the insertion groove 155 of the movable part.

The drive shaft 41 inserted into the insertion groove 155 also moves together along the movement path of the movable portion 154 when the movable portion 154 moves by the trip coil 152. [ The movable member 40 is moved along the longitudinal direction of the movable slit 39 of the switch bracket 38 by the movement of the drive shaft 41.

The pressing protrusion 44 is a protrusion protruding from the main body 43 of the movable member 40 toward the contact switch 32 and arranged to contact the contact plate 35 of the contact switch 32. [

On the other hand, the contact plate 35 can be arranged obliquely with respect to the moving direction of the moving member 40, as shown in Fig. 4B, so that the pressing projection 44 can easily press the contact plate 35 .

Thus, when the movable member 40 is positioned as far as possible from the contact switch 32, the pressing projection 44 slightly contacts or remains separated from the contact plate 35. On the other hand, when the shifting member 40 is moved toward the contact switch 32, the pressing projection 44 presses the contact plate 35, and the press contact plate 35 is resiliently deformed so that the contact switch 32 (Not shown). The contact switch 32 is switched to the On state.

Next, the operation of the trip driving sensing unit according to the present embodiment will be described with reference to Figs. 4A to 5C.

FIGS. 4A to 4C are perspective views for explaining the operation of the trip driving sensing unit according to the embodiment of the present invention. FIGS. 4A to 4C are diagrams for explaining the operation of the trip driving unit and the trip driving sensing unit, 5A to 5C are perspective views showing the trip driving unit and the trip driving sensing unit in different angles, respectively, corresponding to Figs. 4A to 4C, respectively. Fig.

4B, 4C, 5B and 5C show the switch brackets partially omitted.

Referring to this together, the normal operation state is maintained as shown in Figs. 4A to 4C. In this state, the movable portion 154 is inserted into the trip coil 152 as much as possible, and the rotary plate 156 is disposed at the normal position.

4C, the movable member 40 is positioned as far as possible from the contact switch 32 so that the pressing protrusion 44 of the movable member 40 is in slight contact with the contact plate 35 And maintains the separated state.

If an overcurrent protection relay 120 detects an abnormality in the circuit, the overcurrent protection relay 120 transmits a control signal to the trip coil 152 indicating a trip operation.

Current is applied to the trip coil 152, and the movable part 154 moves linearly in a protruding shape as shown in FIGS. 5A to 5C.

The rotation plate 156 rotates in accordance with the movement distance of the movable part 154 with the rotation shaft 151 as the rotation axis. The locking projection (174 in FIG. 2) engaged with the locking ring 158 of the rotation plate 156 also rotates along the rotation direction of the rotation plate 156 by the rotation of the rotation plate 156.

As the latching protrusion 174 rotates, the trip rod 172, which is the rotation axis of the latching protrusion 174, rotates, and the latch release 176 fastened to the trip rod 172 also rotates to latch (not shown) Lt; / RTI >

Accordingly, the movable contact (not shown) is also unlocked to move the movable contact, thereby interrupting the circuit.

The drive shaft 41 of the movable member 40 inserted into the insertion groove 155 of the movable portion 154 moves together with the movable portion 154 as the movable portion 154 linearly moves.

This causes the moving member 40 to move along the moving slit 39 so that the pressing projection 44 of the moving slit 39 presses the contact plate 35 of the contact switch 32.

Then, the pressed contact plate 35 is elastically deformed to press the contact 36 of the contact switch 32, and the contact switch 32 is turned on.

As the contact switch 32 is switched to the On state, the alarm system (not shown) connected to the contact switch 32 is driven, and the operator becomes aware that the trip drive unit 150 has been driven.

The trip driving detection unit of the circuit breaker according to the embodiment of the present invention described above can notify the operator that the trip driving unit has been normally operated when an abnormality has occurred in the circuit breaker so that the operator can easily grasp the internal state of the circuit breaker have.

Further, since the trip driving sensing unit is interlocked with the trip driving unit through a mechanical coupling, high operating reliability can be provided.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: Circuit breaker
120: Overcurrent Protection Relay
150: trip driving unit
152: Trip coil
156: rotating plate
162: Coil bracket
164: Plate bracket
170:
30: trip drive detection unit
32: contact switch
38: Switch bracket
40: movable member

Claims (8)

A sensing unit for sensing driving of a trip driving unit for releasing the locking of the movable contact so that the movable contact provided in the blocking unit can be moved by driving in accordance with a control signal of the overcurrent protection relay,
A moving member that is provided in the trip driving unit and is coupled to the moving unit that linearly moves according to the control signal and moves together with the moving unit; And
A contact switch which is switched to an on state by the moving member;
And a tripping detection unit of the circuit breaker.
The method according to claim 1,
Further comprising a switch bracket coupled to both sides of the contact switch, wherein the switch bracket is fixedly coupled to the trip driving unit.
3. The apparatus according to claim 2,
A body disposed within the switch bracket; And
A sliding block protruding from the main body and inserted and arranged movably in a movable slit formed in the switch bracket;
The tripping detection unit of the circuit breaker.
The apparatus according to claim 3,
And a pressing projection projecting from the main body toward the contact switch,
Wherein the pressing projection switches the contact switch to an on state by pressing the contact switch as the moving member moves.
5. The apparatus according to claim 4,
A trip driving detection unit of a circuit breaker comprising a switch body, a contact plate protruding outward from the switch body, and a contact pressed by the contact plate to internally form a short circuit.
6. The method of claim 5,
As the movable member moves, the pressing projection presses the contact plate of the contact switch to elastically deform the contact plate, and the elastically deformed contact plate presses the contact.
6. The apparatus according to claim 5,
And a plurality of connection terminals connected to an alarm system disposed outside the circuit breaker.
The apparatus according to claim 1,
And a drive shaft protruding downward from the main body and coupled to the movable portion of the trip driving unit.
KR1020150062033A 2015-04-30 2015-04-30 Detecting unit for trip driving of circuit breaker KR101734229B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020150062033A KR101734229B1 (en) 2015-04-30 2015-04-30 Detecting unit for trip driving of circuit breaker
CN201610284171.0A CN106098488B (en) 2015-04-30 2016-04-29 Breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150062033A KR101734229B1 (en) 2015-04-30 2015-04-30 Detecting unit for trip driving of circuit breaker

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KR20160130052A true KR20160130052A (en) 2016-11-10
KR101734229B1 KR101734229B1 (en) 2017-05-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101974970B1 (en) * 2018-01-22 2019-05-03 엘에스산전 주식회사 Electromagnetic contactor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090016323A (en) 2007-08-10 2009-02-13 현대중공업 주식회사 High breaking fast trip device of air circuit breaker

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100854387B1 (en) * 2007-07-12 2008-09-02 엘에스산전 주식회사 Trip device module and circuit breaker having thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090016323A (en) 2007-08-10 2009-02-13 현대중공업 주식회사 High breaking fast trip device of air circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101974970B1 (en) * 2018-01-22 2019-05-03 엘에스산전 주식회사 Electromagnetic contactor

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