KR20160130053A

KR20160130053A - Trip driving unit of circuit breaker

Info

Publication number: KR20160130053A
Application number: KR1020150062034A
Authority: KR
Inventors: 유재구
Original assignee: 현대중공업 주식회사
Priority date: 2015-04-30
Filing date: 2015-04-30
Publication date: 2016-11-10
Also published as: KR101751947B1

Abstract

The trip driving unit of the circuit breaker according to the embodiment of the present invention includes a trip driving unit that is driven in accordance with a control signal of the overcurrent protection relay to release the locking of the movable contact so that the movable contact provided in the blocking unit can move, A trip coil for linearly moving the movable part according to the control signal; And a rotation plate having one end coupled to the rotatable member and the other end connected to the movable member to rotate according to the movement of the movable member and having a protrusion projected outwardly.

Description

[0001] TRIP DRIVING UNIT OF CIRCUIT BREAKER [0002]

The present invention relates to a trip drive 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 is moved by the internal spring force, and the movable contact and the fixed contact are separated from each other.

Therefore, the operating reliability of the trip driving unit for releasing the trip latch from the tripped state through the trip coil must be ensured, and operation must be possible within a short period of time.

Korean Patent Publication No. 10-2009-0016323

SUMMARY OF THE INVENTION It is an object of the present invention to provide a trip driving unit capable of high operation reliability and quick operation.

In this embodiment, the coil bracket to which the trip coil is fixedly fastened; And a plate bracket fixed to the coil bracket and coupled to the rotation axis of the rotation plate.

The present invention further includes a reset plate coupled to the plate bracket at one end so as to be rotatable together with the rotation bracket and the other end supported by an open / close lever provided at the shut- can do.

In this embodiment, the reset plate rotates based on the same rotation axis as the rotation plate, and the rotation plate may be positioned between the reset plate and the plate bracket.

In this embodiment, the rotation plate has a pressing protrusion protruding from the one end side through the reset plate, and the reset plate is in contact with the pressing protrusion during the rotation and presses the pressing protrusion, .

In this embodiment, the movable portion and the rotation plate can be returned to their original positions by the rotation of the reset plate.

In this embodiment, the reset plate includes a flat bar-like elastic portion and a wing portion formed at one side of one end of the elastic portion, the rotation axis passing through the wing portion and being fastened to the plate bracket have.

In this embodiment, the latching ring of the rotating plate is formed in a hook shape and is arranged to engage with a latching protrusion of a trip rod provided in the blocking portion. When the rotation plate is rotated, The latching protrusion and the trip rod can rotate together.

Since the trip driving unit of the circuit breaker according to the present invention is configured to directly rotate the trip rod in a mechanical mechanism manner, there is no incomplete operation and the configuration is simple, so that the operation is simple and the circuit breaking operation can be performed quickly.

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;
Fig. 2 and Fig. 3 are exploded perspective views of the circuit breaker shown in Fig. 1. Fig.
4 is an exploded perspective view of a trip driving unit according to an embodiment of the present invention;
5 and 6 are perspective views for explaining the operation of the trip driving unit according to the embodiment of the present invention.
7 to 9 are side 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 unit according to an embodiment of the present invention, and FIGS. 2 and 3 are exploded perspective views of the circuit breaker shown in FIG.

1 to 3, a circuit breaker 100 according to an embodiment of the present invention may include an overcurrent protection relay 120, a blocking unit 170, and a trip driving unit 150 .

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 . The contact / separation structure of the movable contact point and the stationary contact point is also a well-known technology through the prior art documents, and therefore, only the part directly related to the present invention will be described.

7, the blocking portion 170 according to the present embodiment may include an opening / closing shaft 181, an opening / closing lever 182, and a support pin 183 formed on the opening / closing lever 182 .

The opening and closing shaft 181 is a main rotation axis rotated for movement of the movable contact when the circuit is opened and closed. The opening and closing lever 182 is coupled to the opening and closing shaft 181 and rotates together with the opening and closing shaft 181, Means a lever connected to a movable contact.

2 and 3, the blocking portion 170 may include a trip rod 172 and a latching protrusion 174. The tripping rod 170 may be provided with a latching protrusion 174, as shown in FIGS.

The trip rod 172 rotates by the drive of the trip drive unit or by 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.

The locked state of the movable contact is canceled by the rotation of the latch, and the movable contact is disconnected from the fixed contact to interrupt the circuit.

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 detail in the trip driving unit 150 to be 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. [

4 is an exploded perspective view of the trip driving unit 150 according to the embodiment of the present invention.

The trip driving unit 150 according to the present embodiment includes a trip coil 152 having a movable portion 154 that linearly moves by the attraction of the electromagnetic coil, a rotating coil 152 rotated in accordance with the movement of the movable portion 154, A plate 156, and a reset plate 166 for locating the movable portion 154 in place.

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 and a reset plate 166 are rotatably coupled to the plate bracket 164. More specifically, the rotating plate 156 and the reset plate 166 can be coupled to the plate bracket 164 by a rotating shaft 151. [

The rotation shaft 151 passes through the reset plate 166 and the rotation plate 156 together, and both ends are coupled to the plate bracket 164. The reset plate 166 and the rotation plate 156 are rotatably coupled to the plate bracket 164 with the rotation 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 protrusion 157 of the rotation plate 156, which will be described later, is inserted. Accordingly, the insertion groove 155 can be formed as a groove having a width and a depth into which the insertion protrusion 157 can be inserted.

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 rotation 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 the shape of a hook and is arranged to engage with the latching protrusion 174 of the trip rod 172 provided in the blocking portion 170 as 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. The latch is rotated and the movable contact is disconnected from the stationary contact to interrupt the circuit.

The rotary plate 156 also includes a pressing projection 159 projecting outward at the other end portion into which the rotary shaft 151 is inserted. The pressing projection 159 is disposed outside the reset plate 166 through the reset plate 166 and can be arranged to be in contact with the reset plate 166.

When the reset plate 166 rotates, the reset plate 166 comes into contact with the pressing protrusion 159 and presses the pressing protrusion 159 so that the rotating plate 156 is rotated in the rotational direction of the reset plate 166 And is rotated together with the reset plate 166.

The reset plate 166 has an elastic portion 167 formed in a flat rod shape to provide the function of a leaf spring and a blade portion 167 bent substantially perpendicularly on both sides of one end of the elastic portion 167 connected to the plate bracket 164, (Not shown). The wing portion 168 may be formed with an insertion hole 169a through which the rotary shaft 151 is inserted.

Between the wing portions 168, an opening 169b into which the pressing projection 159 of the rotation plate 156 is inserted is formed. The other end of the rotation plate 156 is disposed between the wings 168 of the reset plate 166 and the pressing projection 159 of the rotation plate 156 penetrates the insertion hole 169a of the reset plate 166 And is disposed on the back surface of the elastic portion 167.

Accordingly, when the reset plate 166 rotates as described above, the resilient portion 167 of the reset plate 166 comes into contact with the pressing protrusion 159 and presses the pressing protrusion 159, 156 rotate together with the reset plate 166.

7, the other end of the elastic portion 167 is supported by the support pin 183 formed on the open / close lever 182 of the blocking portion 170. The reset plate 166 is formed of a metal plate. 9, when the opening and closing lever 182 is rotated with the opening and closing shaft 181 as a rotational axis, the support pin 183 is urged to urge the elastic portion 167 in a direction away from the plate bracket 164 So that the reset plate 166 rotates with the rotating shaft 151 as a rotating shaft.

Next, referring to Figs. 5 to 9, the operation of the trip driving unit 150 according to the present embodiment will be described.

FIGS. 5 and 6 are perspective views for explaining the operation of the trip driving unit according to the embodiment of the present invention, and FIGS. 7 to 9 are side views for explaining the operation of the trip driving unit according to the embodiment of the present invention.

Here, FIG. 5 shows the trip drive unit in the state shown in FIG. 7, and FIG. 6 shows the trip drive unit in the state shown in FIG.

First, the normal operation state shown in Figs. 5 and 7 is maintained. 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.

When an overcurrent protection relay 120 detects an abnormality in the circuit in the state of FIG. 7, the overcurrent protection relay 120 transmits a control signal instructing a trip operation to the trip coil 152.

As a result, current is applied to the trip coil 152, and the movable part 154 linearly moves outwardly as shown in FIGS. 6 and 8.

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 protrusion 174 engaged with the locking ring 158 of the rotation plate 156 is also rotated 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 > 9, the opening / closing lever 182 is rotated, and a movable contact (not shown) connected to the opening / closing lever 182 moves through a link (not shown), thereby blocking the circuit.

9, when the opening and closing lever 182 rotates, a reset plate 166 supported by the support pin 183 is moved along the movement path of the support pin 183 fastened to the opening and closing lever 182 Is also rotated in the direction away from the rotation plate 156. [

The elastic portion 167 of the reset plate 166 presses the pressing projection 159 of the rotary plate 156 so that the rotary plate 156 also rotates along the rotation direction of the reset plate 166 And returned to the home position.

The movable portion 154 of the trip coil 152 coupled to the rotating plate 156 is also inserted into the trip coil 152 and returned to the original position.

Since the trip driving unit of the circuit breaker according to the embodiment of the present invention described above is configured to directly rotate the trip rod by a mechanical mechanism method, there is no incomplete operation and the structure is simple. Can be performed.

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
166: reset plate
170:

Claims

And a trip driving unit which is driven in accordance with a control signal of the overcurrent protection relay to release the locking of the movable contact so that the movable contact provided in the blocking portion can be moved,
A trip coil for linearly moving the movable part according to the control signal; And
A rotary plate having one end thereof rotatably coupled and the other end connected to the movable part and rotating according to the movement of the movable part and having a protrusion protruding outward;
Wherein the trip circuit is a trip circuit.

The method according to claim 1,
A coil bracket to which the trip coil is fixedly fastened; And
A plate bracket fixedly coupled to the coil bracket and coupled to a rotating shaft of the rotating plate;
Further comprising: a tripping unit for the circuit breaker.

3. The method of claim 2,
The circuit breaker according to claim 1, further comprising a reset plate coupled to the plate bracket so as to be rotatable together with the rotation bracket, the other end of the reset plate being supported by an opening / unit.

The method of claim 3,
Wherein the reset plate is rotated based on the same rotation axis as the rotation plate, and the rotation plate is positioned between the reset plate and the plate bracket.

5. The method of claim 4,
Wherein the rotation plate has a pressing protrusion protruding from the one end side through the reset plate,
Wherein the reset plate is in contact with the pressing protrusion during rotation and presses the pressing projection to rotate the rotating plate.

[6] The apparatus of claim 5,
And return to the original position by rotation of the reset plate.

The plasma display apparatus according to claim 5,
A flat bar-like elastic portion and a wing portion formed to be bent to one side from one end of the elastic portion,
And the rotation shaft passes through the wing portion and is fastened to the plate bracket.

[2] The apparatus according to claim 1,
A trip rod of a circuit breaker which is formed in a claw shape and is arranged to engage with a latching protrusion of a trip rod provided in the blocking portion and rotates together with the latching protrusion and the trip rod by the latching ring when the rotation plate is rotated, Drive unit.