KR101545497B1 - Fast Trip Unit for Circuit Breaker - Google Patents

Abstract

A high speed trip unit for a circuit breaker is disclosed. The high-speed trip unit for a circuit breaker according to the present invention is characterized in that the plunger connected to the operating lever side of the circuit breaker while being linearly reciprocating is moved quickly by an open coil including an inner coil having a large diameter of the lead wire and an outer coil having a small diameter of the lead wire Move. Therefore, when an abnormal current flows through the switchboard, the interrupter can be tripped by quickly moving the plunger, thereby preventing damage to various devices including the load and the rectifier.

Description

[0001] The present invention relates to a high-speed trip unit for a circuit breaker,

The present invention relates to a high-speed trip unit for a circuit breaker, which prevents a load and a peripheral device from being damaged by an abnormal current by tripping a circuit breaker installed in the switchboard at a high speed in the event of an accident caused by an overcurrent or a fault current will be.

An electric distribution panel is a device installed in a power plant, a substation or a building in which an electric facility is installed, and is a device for converting high-voltage electric power to low voltage for distribution. Various switchboards are equipped with various devices including circuit breakers, rectifiers, relays, various instruments and indicators for switching on and off the circuits and controlling and monitoring the devices according to their applications.

A rectifier is a device that converts an alternating current into a direct current. The rectifier converts the alternating current into direct current using a combination of a semiconductor device, such as a silicon diode (SD) or a silicon controlled rectifier (SCR) switching device. SCR switching devices are particularly susceptible to damage by overcurrent, are difficult to replace upon failure, and are expensive.

For this reason, when an abnormal current flows through the switchboard, a breaker for protecting other devices including the rectifier is installed. A breaker is a device that cuts off the current flow when an abnormal current flows through an electric circuit, or cuts off the current flow during maintenance, and includes a trip unit.

If the flow of current is interrupted for maintenance, the circuit breaker does not need to be operated quickly. However, when the flow of current is to be interrupted by the abnormal current, the circuit breaker must be operated as quickly as possible to prevent the load and the device of the switchboard from being damaged by the abnormal current.

Generally, the trip unit of the breaker operates by receiving power from a battery installed in the switchboard. However, the battery supplies not only the trip unit of the breaker but also other devices including the rectifier. Therefore, the trip unit of the circuit breaker is difficult to receive a large current from the battery. If the circuit breaker is supplied with a large current from the battery, the other device can not receive the current, which may cause malfunction or damage.

Therefore, the trip unit of the conventional circuit breaker is difficult to receive a large current from the battery, so that it is difficult for the circuit breaker to quickly interrupt the current flow.

Prior art relating to breakers and the like are disclosed in Korean Patent Laid-Open Nos. 10-2008-0063145 and 10-1343512.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a circuit breaker which can quickly drive a breaker, Speed trip unit for a breaker.

According to an aspect of the present invention, there is provided a high-speed trip unit for a circuit breaker, including: a case; A plunger installed inside the case so as to be linearly movable from one side of the case to the other side of the case and connected to the operation lever side of the circuit breaker; An input coil installed at an inner side of the case and acting with the plunger to move the plunger toward one side of the case; And an open coil installed on the other side of the case and acting on the plunger to move the plunger toward the other side of the case, wherein the open coil includes an inner coil installed to surround the other side of the plunger; And an outer coil wound around the inner coil.

According to another aspect of the present invention, there is provided a high-speed trip unit for a circuit breaker including a case; A plunger installed inside the case so as to be linearly movable from one side of the case to the other side of the case and connected to the operation lever side of the circuit breaker; An input coil installed at an inner side of the case and acting with the plunger to move the plunger toward one side of the case; And an open coil installed on the other side of the case and acting on the plunger to move the plunger toward the other side of the case, wherein the open coil includes an inner coil installed to surround the other side of the plunger; And an outer coil disposed between the other side of the case and the inner coil to surround the other side of the plunger.

The high-speed trip unit for a circuit breaker according to the present invention is characterized in that the plunger connected to the operating lever side of the circuit breaker while being linearly reciprocating is moved quickly by an open coil including an inner coil having a large diameter of the lead wire and an outer coil having a small diameter of the lead wire Move. Therefore, when the abnormal current flows in the switchboard, the plunger can be quickly moved to trip the breaker, thereby preventing damage to various devices including the load and the rectifier.

1 is a perspective view of a high-speed trip unit for a circuit breaker according to an embodiment of the present invention;
2 is a sectional view of Fig. 1;
3 is an enlarged view of a portion "A"
4 is a cross-sectional view showing a state in which the plunger shown in FIG. 2 is moved to the left.
5 is a driving circuit diagram of the high-speed trip unit for the circuit breaker shown in Fig.
6 is a partially cutaway perspective view of a high speed trip unit for a circuit breaker according to another embodiment of the present invention;

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

The term "above" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, a high-speed trip unit for a circuit breaker according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a high-speed trip unit for a circuit breaker according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is an enlarged view of an "A" In which the plunger is moved to the left side.

As illustrated, the high-speed trip unit for a circuit breaker according to an embodiment of the present invention may include a case 110, and the case 110 may be formed by laminating a single sheet of steel. When the case 110 is formed by stacking the sheet steel sheets, the loss due to the eddy-current which interferes with the motion of the plunger 120 to be described later can be reduced.

The eddy current refers to a swirl current flowing through a magnetic body due to an electromotive force generated as a magnetic flux changes among magnetic bodies. And the eddy current is the current which resists the change of the magnetic field, and obstructs the movement of the moving conductor in the magnetic field.

A plunger 120 may be installed inside the case 110. The plunger 120 is disposed approximately at the center side of the case 110 and can be installed so as to reciprocate linearly from the left side and the right side to the right side from the right side of the case 110. [ The plunger 120 is formed of a magnetic material and acts on the input coil 140 and the open coil 150, which will be described later, to reciprocate linearly.

One side of the driving shaft 125 may be coupled to the left side and the right side of the plunger 120, respectively. The driving shaft 125 moves together with the plunger 120. The other side of the drive shaft 125 may be located outside the case 110 through the right side surface and the left side surface of the case 110, respectively. The substantially central portion of the drive shaft 125 is supported on the right and left sides of the case 110 so that the plunger 120 can be positioned on the inner center side of the case 110.
A bush 130 may be installed on the right and left sides of the case 110, respectively, to which the drive shaft 125 is inserted. That is, the outer circumferential surface of the drive shaft 125 is held in contact with the inner circumferential surface of the bush 130, and the drive shaft 125 can be linearly reciprocated in a stable manner by the bush 130. Therefore, the plunger 120 also reciprocates in a stable manner.

A winding coil 140 may be installed on the inner side of the case 110. The winding coil 140 may surround the right side of the plunger 120 at least. When the power is supplied to the input coil 140, the plunger 120 moves linearly toward the right side of the case 110 by the action of the electric force formed on the input coil 140 and the magnetic force formed on the plunger 120 (See FIG. 2).

The open coil 150 may be wound around the left side of the plunger 120. The open coil 150 may be wound around the left side of the case 110. [ When the power is supplied to the open coil 150, the plunger 120 moves linearly toward the left side of the case 110 by the action of the electric force formed on the open coil 150 and the magnetic force formed on the plunger 120. [ (See Fig. 4).

The drive shaft 125 coupled to the right side of the plunger 120 may be connected to an operation lever (not shown) of the circuit breaker. The operation lever is moved by the drive shaft 125 and the connection terminal (not shown) of the breaker connected to the operation lever is connected to various devices including a rectifier (not shown) installed in the switchboard, ). Then, the connection terminal can be connected to or disconnected from connection terminals (not shown) of various devices including the rectifier.

Thus, when the plunger 120 moves to the right due to the action of the plunger 120 and the input coil 140, the driving shaft 125 coupled to the right side surface of the plunger 120 also moves to the right, And the breaker is turned on. Then, the current flows from the rectifier to the circuit breaker, so that the flow is maintained.

4), the driving shaft 125 coupled to the right side surface of the plunger 120 is also moved to the left side, and when the plunger 120 is moved to the left side by the action of the plunger 120 and the open coil 150, As a result, the connection terminal is moved to trip the breaker. Then, the current does not flow in the rectifier but is shut off.

That is, the input coil 140 moves the plunger 120 to allow current to flow to various loads including the rectifier installed in the switchboard, and the open coil 150 moves the plunger 120, It should be cut off to prevent current from flowing to various load including rectifier.

A permanent magnet 160 may be installed inside the case 110 between the charging coil 140 and the opening coil 150. The permanent magnet 160 may be installed to surround the plunger 120, and the plunger 120 may have a large magnetism.

A magnetic support member 165 may be provided between the permanent magnet 160 and the plunger 120 so that the magnetism of the permanent magnet 160 can be easily transferred to the plunger 120. [ The outer circumferential surface of the support member 165 may be contactably supported on the inner circumferential surface of the permanent magnet 160 and the inner circumferential surface thereof may cover the plunger 120.

The support member 165 can guide the plunger 120 to make a stable linear motion. A plurality of rollers 167 may be rotatably mounted on the inner circumferential surface of the support member 165 and an outer circumferential surface of the roller 167 may contact the outer circumferential surface of the plunger 120 to support the plunger 120 have.

Protrusions 115 protruding inwardly of the case 110 may be formed on the left side surface portion and the right side surface portion of the case 110 through which the drive shaft 125 passes. The protrusion 115 on the right side is in contact with the right end face of the plunger 120 and the protrusion 115 on the left side is in contact with the left end face of the plunger 120 to change the linear movement distance of the plunger 120 Can be limited. A spacer 117 may be provided on the end surface of the protrusion 115 to mitigate impact when the plunger 120 hits the protrusion 115.

If an abnormal current flows through the switchboard (panel), it is necessary to shut off the flow of current quickly to prevent damage to various devices including the rectifier.

The high speed trip unit for a circuit breaker according to an embodiment of the present invention includes an inner coil 151 and an outer coil 155 so that the plunger 120 can be quickly moved to the left side of the case 110. [ .

In detail, the inner coil 151 may surround the left portion of the plunger 120, and the outer coil 155 may surround the inner coil 151. That is, the inner coil 151 and the outer coil 155 may be arranged in a concentric fashion.

At this time, the diameter of the lead wire of the inner coil 151 may be larger than the diameter of the lead wire of the outer coil 155. This is to supply a current larger than the current supplied to the outer coil 155 to the inner coil 151.

2, when it is desired to block the flow of the current flowing through the various devices of the distribution board or the like for maintenance or the like, power is supplied to the outer coil 155 so that the plunger 120 is moved to the position shown in FIG. And moves to the illustrated state. Then, since the circuit breaker trips, current does not flow to the load and various devices.
In the state shown in Fig. 2, when an abnormal current flows and the flow of current flowing in various devices of the distribution board or the distribution board is to be cut off at a high speed, power is supplied to the inner coil 151. A large electric force is generated by the inner coil 151 through which the relatively large current flows so that the electromagnetic force acts between the open coil 150 and the plunger 120, To the left side of Fig. 4, resulting in the state shown in Fig. Therefore, since the circuit breaker is quickly tripped, current does not flow through the circuit or various devices.

The power can be supplied to the inner coil 151 and the outer coil 155 at the same time in order to more quickly trip the breaker when the breaker trips due to an abnormal current.

Fig. 5 is a driving circuit diagram of the high-speed circuit breaker shown in Fig. 1, which will be described.

The outer coil 155 of the open coil 150 can receive power from the battery 171 of the switchboard and the inner coil 151 can be supplied from a separate capacitor 175 Power can be supplied. Therefore, the center current can be supplied to the inner coil 151.

When the first contact 181 is operated under the control of the control unit 180, the power source of the battery 171 is supplied to the outer coil 155 to move around the plunger 120, and the second contact 183, The power source of the capacitor 175 is supplied to the inner coil 151 and the plunger 120 moves. It is natural that the first contact 181 and the second contact 185 can operate simultaneously by the control unit 180. [

6 is a partially cutaway perspective view of a high-speed trip unit for a circuit breaker according to another embodiment of the present invention, and only differences from FIG. 2 will be described.

The open coil 250 is disposed between the inner coil 251 and the left side surface of the case 210 so as to surround the left side portion of the plunger 220 and the plunger 220 is disposed between the inner coil 251 and the left side surface of the case 210, And an outer coil 255 installed to surround the left part of the coil.

That is, the inner coil 251 and the outer coil 255 can be continuously arranged along the longitudinal direction of the plunger 220. It is preferable that the inner coil 251 for moving the plunger 220 to move quickly is positioned closer to the center side of the plunger 220 than the outer coil 255.

The high-speed trip unit for a circuit breaker according to the present embodiment includes a plunger 120 (220) for connecting or disconnecting a current flowing in various devices including a rectifier and a rectifier while linearly reciprocating, an inner coil 151 having a large diameter, (250) including the outer coil (155) (255) having a small diameter of the wire and the coil (251) having a small diameter. Therefore, when an abnormal current flows in the switchboard, the plunger 120 (220) can be quickly moved to trip the breaker, so that various devices including the load and the rectifier can be prevented from being damaged.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

110: Case
120: plunger
140: input coil
150: Open coil
151: Inner coil
155: outer coil

Claims (8)

case;
A plunger installed inside the case so as to be linearly movable from one side of the case to the other side of the case and connected to the operation lever side of the circuit breaker;
An input coil installed at an inner side of the case and acting with the plunger to move the plunger toward one side of the case;
An open coil installed on the other side of the case and acting on the plunger to move the plunger toward the other side of the case;
A permanent magnet disposed inside the case between the open coil and the closing coil, the permanent magnet surrounding the plunger;
And a support member of a magnetic body having an outer circumferential surface on the inner circumferential surface of the permanent magnet and surrounding the plunger,
Wherein the open coil includes an inner coil wound around the other side of the plunger and an outer coil wound around an outer circumferential surface of the inner coil and concentric with the inner coil and formed of a conductor having a diameter smaller than the diameter of the conductor of the inner coil With a coil,
A roller is provided on an inner circumferential surface of the support member to contact the outer circumferential surface of the plunger to guide a linear movement of the plunger,
The outer coil is supplied with power from a battery installed in the switchboard,
And the inner coil is supplied with power from a capacitor. delete delete delete delete delete The method according to claim 1,
One side of the driving shaft is coupled to one side of the plunger and the other side of the driving shaft is moved together with the plunger,
And the other side of the drive shaft passes through one side surface and the other side surface of the case and is located outside the case,
And a bush for supporting the drive shaft and guiding the linear movement of the plunger is installed on one side surface and the other side surface of the case. 8. The method of claim 7,
A protrusion for limiting a linear movement distance of the plunger is formed on one side surface and the other side surface of the case through which the drive shaft passes,
And a spacer is provided on an end face of the protrusion.

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