KR20140042037A

KR20140042037A - Earth leakage circuit breaker

Info

Publication number: KR20140042037A
Application number: KR1020120107732A
Authority: KR
Inventors: 박경택; 김재모; 김원삼
Original assignee: 현대중공업 주식회사
Priority date: 2012-09-27
Filing date: 2012-09-27
Publication date: 2014-04-07

Abstract

An earth leakage circuit breaker includes a body case in which a load side terminal connected to a main circuit line, a power side terminal, an arc runner, and an operation lever are installed, a zero phase current transformer which is installed on the front of the body case and detects a leakage current in the main circuit line, an electric leakage detecting circuit which determines the electric leakage of the main circuit line by the output signal of the zero phase current transformer, a trip unit which blocks the current by operating with the output signal of the electric leakage detecting circuit, and a circuit board which includes a plurality of switching units on one side thereof. The circuit board is installed by being divided into a plurality of circuit board parts. The circuit board includes the circuit board parts which include the switching units selectively installed on one side thereof.

Description

{EARTH LEAKAGE CIRCUIT BREAKER}

The present invention relates to an earth leakage circuit breaker, and more particularly, by dividing a plurality of circuit boards on which an earth leakage detection circuit, a sensitivity current switch, an operation time switch, and an earth leakage test switch are installed, thereby reducing the occurrence of interference between the respective components, and When the change is easy to change the installation position, and relates to an earth leakage breaker easy to secure the installation space.

Generally, an earth leakage breaker is a device which cuts off a power supply when the electric current which flows in a circuit by a short circuit exceeds a predetermined value.

The conventional earth leakage breaker includes a main body case made of an insulator, a main power terminal on the power supply side to which the main circuit path is connected, a main power terminal on the load side, and a main circuit current to flow through the main circuit terminal. A main circuit conduction unit disposed in the case, an image current transformer which detects an image current of the main circuit current through the main circuit conduction unit, and an earth leakage detection circuit that discriminates the leakage of the main circuit path by the output signal of the image current transformer. A circuit unit having a printed circuit board to be configured, a main body case which fixes the printed circuit board and protects the printed circuit board from melts generated during interruption, and is operated by an output signal of the ground fault detection circuit to cut off the main circuit path. It consists of a blocking mechanism and the like.

However, in the conventional circuit breaker, various switches and a circuit board on which the ground fault detection circuit is installed form one body, and thus it is not easy to secure an installation space of the circuit board, and it is difficult to change the position or direction of each component. There was this.

Prior arts related to the present invention include Korean Patent No. 10-0928361 (November 17, 2009), which discloses an earth leakage breaker for a multiphase circuit.

SUMMARY OF THE INVENTION An object of the present invention is to install a plurality of circuit boards on which an earth leakage detection circuit, a sensitivity current switch, an operation time switch, and an earth leakage test switch are installed, thereby reducing the occurrence of interference between components and changing the installation position or direction when changing the structure. It is to provide an earth leakage breaker that is easy to secure installation space.

The earth leakage circuit breaker according to the present invention includes a main body case provided with a load side terminal, a power supply terminal, an arc runner, and an operation lever to which the main circuit converter is connected, and a leakage current of the main circuit converter provided at the front of the main body case. A video current transformer to be detected, an electric leakage detection circuit for discriminating a short circuit to the main circuit by the output signal of the video current transformer, a trip unit operating by an output signal of the electric leakage detection circuit to cut off a current; An earth leakage circuit breaker having a circuit board on which a plurality of switching units are mounted, wherein the circuit board is divided into a plurality and includes a plurality of circuit boards on which one side of the switching unit is selectively installed. .

Here, the switch unit is preferably provided with a sensitivity current switch for adjusting the rated sensitivity current value, a time switch for adjusting the operating time, and a short circuit test switch for testing a short circuit.

In addition, the circuit boards may include a first substrate on which the ground fault detecting circuit and the ground fault test switch are disposed on the front surface, a second substrate on which the sensitivity current switch is disposed on the front surface, and a third on which the operation time switch is disposed on the front surface. It is preferable to have a substrate.

In addition, one end of the second substrate and the third substrate are disposed adjacent to each other in parallel with each other, and one end of the first substrate is positioned adjacent to one end of the second substrate and the third substrate to form a single plate shape. Can be.

In addition, the circuit boards may be installed in the interior of the substrate case is installed on the front of the main body case, the substrate case is fixedly installed on the front of the main body case, the lower case and the circuit boards are installed therein; And an upper case coupled to one surface of the lower case to cover the front surfaces of the circuit boards and forming a plurality of through holes to expose the sensitivity current switch, the operation time switch, and the leakage test switch to the outside. Can be.

The present invention divides the circuit board into a plurality of circuit boards so that the earth leakage detection circuit, the sensitivity current switch, the operation time switch, and the earth leakage test switches can be individually installed, thereby reducing the occurrence of interference between components and changing the installation position when the structure is changed. It is easy to secure the installation space has the effect.

1 is a perspective view for showing a circuit breaker according to the present invention.
2 is a perspective view illustrating a circuit board and a substrate case in an earth leakage breaker according to the present invention.
3 is a view showing the arrangement of the circuit board in the earth leakage breaker according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

As shown in FIG. 1, the earth leakage breaker according to the present invention includes a main body case 100, an image current transformer 200, an earth leakage detection circuit 300, a switching unit 400, a trip unit 500, And a circuit board 500.

The main body case 100 is provided with load side terminals 110 to which the load side of the main circuit converter is connected to one side of the front surface.

Then, the power supply side terminals 120 to which the power supply side of the main circuit converter is connected to the other side opposite to the load side terminals 110 are installed.

In addition, an arc runner for arc extinguishing and an operation lever 130 for operating ON / OFF are rotatably installed in the main body case 100.

In addition, a cover (not shown) may be coupled to the front surface of the main body case 100, and a through hole is formed in the cover to expose the operation lever 130 to the outside.

A zero phase current transformer 200 is installed at the front of the body case 100 to detect currents of the load terminal 110 and the power supply terminal 120.

The video current transformer 200 is installed at the front of the main body case 100 to detect a current of the main circuit.

That is, the image current transformer 200 detects an unbalanced current between the primary conductors of the main circuit converter.

The earth leakage detection circuit 300 determines an earth leakage of the load terminal 110 and the power supply terminal 120 based on the output signal of the video current transformer 200 as shown in FIG. 2.

That is, the leakage detection circuit 300 detects the occurrence of the ground fault based on the secondary output level from the image current transformer 200.

The switching unit 400 may be provided as a sensitivity current switch 410, an operation time switch 420, and an earth leakage test switch 430.

The sensitivity current switch 410 is for adjusting the rated sensitivity current value, the time switch 420 is for adjusting the operation time, and the ground fault test switch 430 is for testing a short circuit.

The trip part is installed on the front surface of the main body case 100, interlocks with the operation lever 130 described above, and has a function of blocking the main circuit path by the output signal of the ground fault detection circuit 300.

Here, the trip unit may be provided with a fixed terminal capable of making a connection with the power supply terminal 120 and the load side terminal 110, and mechanism parts for opening and closing the movable terminal to be mechanically contacted.

That is, an arc is generated when the movable terminal and the fixed terminal are opened, and the generated arc may be guided to the arc extinguishing chamber by the arc runner described above to be extinguished and discharged.

The circuit board 500 includes a ground fault detecting circuit 300, a sensitivity current switch 410, an operation time switch 420, and a ground fault test switch 430 on one surface thereof.

In particular, the circuit board 500 is divided into a plurality of front surfaces of the main body case 100. An electric leakage detecting circuit 300, a sensitivity current switch 410, and an operation time are provided on one surface of the main body case 100. The switch 420 and the ground fault test switch 430 are selectively installed in each.

Here, the circuit boards 500 may be provided with a first substrate 510, a second substrate 520, and a third substrate 530, as shown in FIGS. 2 and 3.

First, the first substrate 510 is provided with a ground fault detecting circuit 300 and a ground fault test switch 430 in front.

In the second substrate 520, the sensitivity current switch 410 is installed at the front surface, and in the third substrate 530, the operation time switch 420 is installed at the front surface.

Here, one end of the second substrate 520 and the third substrate 530 may be adjacent to each other in parallel with each other.

In addition, one end of the first substrate 510 may be adjacent to one end of the second substrate 520 and the third substrate 530 which are installed side by side to form a single plate.

In addition, the first substrate 510, the second substrate 520, and the third substrate 530 may be installed with their ends spaced apart from each other.

In addition, the circuit boards 500 may be installed inside the substrate case 600 installed on the front surface of the body case 100.

The substrate case 600 may be provided as a lower case 610 and an upper case 620.

The lower case 610 is fixedly installed on the front surface of the body case 100, and circuit boards 500 are installed on the inner bottom surface of the lower case 610.

The upper case 620 is coupled to correspond to one surface of the lower case 610 to cover the front surface of the circuit boards 500.

As a result, the present invention divides and installs the circuit board 500 in which the ground fault detecting circuit 300, the sensitivity current switch 410, the operation time switch 420, and the ground fault test switch 430 are provided in a plurality. It reduces the occurrence of interference between them, it is easy to change the installation position when changing the structure, it is easy to secure the installation space.

Although specific embodiments of the earth leakage breaker according to the present invention have been described so far, it is obvious that various embodiments can be modified without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

100: main body case 110: load side terminal
120: power supply terminal 130: operation lever
200: video current transformer 300: ground fault detection circuit
400: switching unit 410: sensitivity current switch
420: operation time switch 430: earth leakage test switch
500: circuit board 510: first substrate
520: second substrate 530: third substrate
600: substrate case 610: lower case
620: upper case

Claims

A main body case to which a load side terminal, a power side terminal, an arc runner, and an operation lever are connected to the main circuit converter, an image current transformer installed on the front of the main body case to detect a leakage current of the main circuit converter, and the image. An electric leakage detecting circuit for discriminating an electric leakage of the main circuit path by an output signal of a current transformer, a trip part operating by an output signal of the electric leakage detecting circuit to cut off current, and a circuit board having a plurality of switching parts mounted on one surface thereof In the earth leakage breaker is provided,
The circuit board may include a plurality of circuit boards, each of which may be divided into a plurality of circuit boards and the switching units may be selectively installed on each of the circuit boards.

The method of claim 1,
The switch unit,
A sensitivity current switch for adjusting the rated sensitivity current value,
A time switch for adjusting the operation time,
An earth leakage circuit breaker, characterized in that provided with an earth leakage test switch for testing the earth leakage.

3. The method of claim 2,
The circuit boards,
A first substrate on which the ground fault detecting circuit and the ground fault test switch are installed;
A second substrate on which the sensitivity current switch is installed in front;
And a third substrate having the operation time switch installed on a front surface thereof.

The method of claim 3,
The second substrate and the third substrate,
One end is installed adjacent to each other side by side,
Wherein the first substrate comprises:
And an end of which is adjacent to one end of the second substrate and the third substrate to form a single plate.

The method of claim 1,
The circuit boards,
It may be installed inside the substrate case which is installed on the front of the main body case,
The substrate case,
A lower case fixedly installed at the front of the main body case and having the circuit boards installed therein;
The upper case is coupled to correspond to one surface of the lower case, covers the front surface of the circuit board, and has an upper case forming a plurality of through holes to expose the sensitivity current switch, the operation time switch, and the leakage test switch to the outside. Earth leakage breaker, characterized in that.