KR100510715B1 - leakage circuit breaker - Google Patents

Abstract

The present invention is to provide a miniature 4-pole earth leakage circuit breaker built-in parts for overload, short circuit, and earth leakage breaker, and the 4-pole earth leakage circuit breaker and the peripheral device performing the earth leakage function are provided in an enclosure case and cover of insulating material. It is composed of one-piece, it has the effect of downsizing the distribution box, cost reduction and simplify the load system.

Description

Leakage Circuit Breaker

The present invention relates to an earth leakage circuit breaker, and more particularly, to an integrated earth leakage circuit breaker applied to a three-phase four-wire circuit.

An earth leakage breaker is an industrial electrical equipment product that has the function of a circuit breaker that cuts a line in the event of a short circuit or an electric shock, and a circuit breaker that cuts the line within the specified operating time in the event of a short circuit or electric shock. to be.

In particular, the earth leakage breaker is used for the purpose of preventing an electric shock and ground fault caused by the metal enclosure of the electrical installation or the human body contacting the conductive portion.

Ground fault protection in Korea is legally regulated to be applied to type 2 ground and type 3 ground by dividing the resistance value of the protective ground according to the allowable contact voltage according to the line environment and human contact environment.

However, the ground fault protection by this protective grounding method is difficult because the grounding is difficult due to the small value of several Ω. This is an impossible situation.

Therefore, a method of constructing a converter using an earth leakage breaker and relieving the resistance value of the protective earth has been adopted.If the construction of such a protective earth is also impossible, an earth leakage breaker (sensitivity current 30 mA, operation) for human body electric shock protection is available. Time 0.03 seconds).

In particular, it is a low-voltage mechanical device with a metal enclosure and a working voltage exceeding 60V. Ground fault protection device that automatically cuts off the circuit when a ground fault occurs in the converter that supplies electricity to equipment used in places where humans may be easily contacted. That is, it is regulated by Article 45 (1) of the Technical Standard for Electrical Equipment to install an earth leakage breaker.

Current leakage circuit breakers are single-phase two-wire, three-phase three-wire and three-phase four-wire leakage circuit breakers are commercialized and used for the purpose of electric shock protection and protection of lines and load devices.

At this time, in the three-phase four-wire line, it is used in the form of parallel use of a four-pole wiring breaker (4P MCCB) and a single-phase two-wire ground circuit breaker (ELCB), or a 4P MCCB (Molded Case Circuit). Breaker) and a peripheral device that implements a circuit breaker function are used in combination.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the earth leakage circuit breaker used in parallel of 4P MCCB and single-phase two-wire ELCB in the prior art.

1, main 3P / 4P MCCB (Molded Case Circuit Breaker) (410, 410 '), branched ELCB (Earth-Leakage Circuit Breaker) 420 ( 420 ').

When the breakdown of the terminal load device 430 or the contact of the exposed conductive part 440 occurs, the total voltage of the line is 2 type ground of the secondary side of the transformer 450 and 3 type ground of the load device 430. And the voltage is distributed by the body resistance value, etc. At this time, the current affecting the human body appears as the occurrence of an accident by the ground (electric shock) current Ia due to the contact voltage induced in the human body.

At this time, the earth leakage breaker 460 connected to the power supply side of the load protects the load equipment from ground faults and prevents personnel accidents by electric shock by blocking the electric current by a series of operations of detecting / determining / driving an accident current. .

However, there is a problem in the line contact between the main 3P / 4P MCCB 410 and 410 'and the branch ELCB 420.

First, referring to the circuit breaker to which the 3P MCCB 410 and the branch ELCB 420 shown in (Example 1) of FIG. 1 are applied, the insulation between the R phase and the N phase is unstable at the front end of the main MCCB 410 and thus on the N upper side. It can be assumed that an abnormal voltage can occur.

At this time, the 3P MCCB 410 that cannot block the N-phase cannot prevent the N-phase ground fault of the 3P MCCB load stage.

That is, for a safer system application on a three-phase four-wire line, the 4P MCCB 410 'should be applied.

However, even if the 4P MCCB (410 ') is applied, the electric current of several to several tens of mA causing the electric shock due to the operation characteristics of the MCCB can not play a role of disconnecting the electric current within the accident time (within 0.003 to 0.1 seconds).

For example, using the 4P ELCB 420 'and the branch ELCB 420 shown in FIG. 1 (Example 2), which is another case, 220 V is supplied from a three-phase four-wire line like a lamp line wiring lamp. In the case of supplying power to the main circuit, the lines between the main ELCB 420 'and the branch ELCB 420 are mostly buried underground, and construction of the "A" and "B" parts to supply power to the circuit breakers for each street light is inevitable. Do.

At this time, it can be said that complete insulation construction of "A" and "B" parts is almost impossible.

There is no problem in the case where the construction position of the "B" part is located at a considerably high level on the ground or when the construction position of the "A" part is buried in the ground where the resistance is relatively high. It is wiped out and exposed, which can cause personnel accidents.

In order to solve this problem, the problem can be solved by applying a combination of a 4P MCCB and a peripheral device which performs an electric leakage function.

2A, 2B, and 2C are diagrams illustrating a circuit breaker combining a 4P MCCB and a peripheral device according to the prior art, and FIGS. 2D and 2E are wiring diagrams of a circuit breaker combining a 4P MCCB and a peripheral device according to the prior art.

2a to 2e, the ZCT (Zero Current Transformer) 5, the terminal block 6, the earth leakage relay 7 and the power supply unit 8, which is a peripheral device combined with the 4P MCCB 2 to perform the electric leakage function, are separately included. It is fixed to the fixed plate (1) of, or attached to the inside of the panel is configured.

After the attachment of the peripheral device, a series of wiring work must be performed to perform a ground fault interrupting function. In this case, the power supply method of the ground fault relay 7 may use a voltage of a line or a separate power source independent of the line voltage. It can also be supplied using.

In addition, in the ZCT through conductor 4 and ZCT 5, a cable through type conductor as shown in FIG. 3A is applied to a line having a small capacity according to the rated current of the line, a breaking capacity, and the like. The bus-bar through conductors shown in 3b apply.

When configured in this manner, the detection of a ground fault (electric shock) fault of the current operated earth leakage breaker is detected by the ZCT 5.

Unlike a typical CT, a zero current transformer (ZCT) 5 surrounds the entire line as shown in FIGS. 3A and 3B, and the ZCT 5 is a vector sum of total conductor currents penetrating through the inside. To output.

That is, when the ZCT 5 is used as a reference, since the vector sum of the currents becomes "0" in the normal use state, the output of the ZCT 5 becomes "0".

However, if a fault current such as ground fault or electric shock occurs on the load side, current unbalance occurs as much as the fault current and it is sent out as an output signal.

The detection of the fault current of the ZCT 5 is transmitted to the ground fault relay 7, and the ground fault relay 7 determines whether the detected signal is a value of a prescribed sensitivity current, and when it is higher than the reference value, The trip coil 3 is operated to drive the breaker device to break the line.

Such operations shall be made within the prescribed operating time.

For example, in the case of an earth leakage circuit breaker for protecting the human body, it should be made within 0.03 seconds.

However, 4P MCCBs and peripheral devices such as conductors (4), ZCT (5), terminal blocks (6), and earth leakage relays (7) are placed in the earth leakage breaker which is a combination of these 4P Molded Case Circuit Breakers (MCCBs) and peripheral devices. Space for wiring and wiring space for electrically connecting them are required. This space is not only the size of the distribution box, but also an increase in cost.

Accordingly, an object of the present invention is to provide a 4P earth leakage circuit breaker miniaturized by incorporating components that perform overload, short circuit, and earth leakage interrupting function.

Another object of the present invention is to provide a compact 4P earth leakage breaker in one unit, to reduce the size and cost of the distribution box and simplify the load system.

Still another object of the present invention is to provide a 4P earth leakage breaker using a combination of 4P MCCB and peripheral devices in a system device using both three-phase load and single-phase load.

In order to achieve the above object, the present invention provides a fixed contactor connected to a power source or a load side, and moves to a position for closing a circuit by contacting the fixed contactor or a position separated from the fixed contactor to open a circuit between a power supply and a load. A movable contactor, an opening and closing mechanism portion for driving the movable contactor to the open and closed position, a tripping mechanism portion for detecting abnormal current in the circuit and driving the opening and closing mechanism portion to a trip position, and a short circuit on the circuit for detecting the circuit leakage. An earth leakage circuit breaker having a ground fault detection unit for driving the trip mechanism unit to drive to a trip position, all of which are incorporated in an enclosure case and a cover of an insulating material, wherein the earth fault detection unit; Each electrode consisting of four bar electrodes and electrically connected to the power supply side and the load side to provide a converter from the power supply side to the load side has a conductor bar having a quarter-circular cross section, and is connected to the conductor bar to connect the power supply path to the conductor bar. ZCT for connecting bus bar-shaped high conductor, bus bar-shaped terminal block connected to the conductor bar, and connecting the load-side converter to the conductor bar, and through which the conductor bar penetrates and detects a short circuit in the circuit flowing through the conductor bar. A zero current transformer), an electronic circuit unit for providing an output signal for determining whether to drive the trip mechanism unit by determining and amplifying the output signal from the ZCT, a groove for accommodating the fixed conductor and the terminal block, and the conductor bar. In order to insulate a plurality of rod electrodes, a conductor insulation part having a “+” shape is provided, and a short circuit is built in the ZCT and the electronic circuit part. To provide an output base and a circuit breaker which comprises a base cover has a feature.

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Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of the earth leakage breaker according to the present invention will be described with reference to the accompanying drawings.

4A and 6 are cross-sectional views of a four-pole earth leakage breaker according to the present invention, and FIGS. 4B and 4C are perspective views of a four-pole earth leakage breaker according to the present invention.

5 is an assembled view and a perspective view of a four-pole earth leakage breaker according to the present invention.

Referring to the drawings, an earth leakage breaker according to an embodiment of the present invention is a four-pole wired circuit breaker (Molded Case Circuit Breaker; referred to as 4P MCCB) and the earth leakage detector is an insulation case 10 and cover 20 of insulating material It is built in.

At this time, the peripheral device is composed of a plurality of bar electrodes, the conductor bar 72 for supplying a power current to the load end from the power supply unit, and the conductor bar 72 is penetrated, the overcurrent flowing in the conductor bar 72 Zero current transformer (ZCT) 113 that detects and detects an accident current such as a short circuit, an electric shock, an electronic circuit unit 114 that determines and amplifies an output signal of the ZCT 113, and the electronic circuit unit ( Trip mechanisms 70, 80, 90, and 100 for blocking the electric current by using overcurrent and instantaneous accident current output from 114, and a bus bar for connecting a load-side wire to the conductor bar 72. A fixed conductor (71) (81) (91) (101) in the form of) and terminal blocks (130) (140) (150) (160) for connecting the power supply-side electric wire to the conductor bar (72).

In addition, the 4P MCCB has an arc chamber 40 serving as arc extinguishing, an opening / closing mechanism unit 50 for blocking the converter, and a handle 60 for externally operating the opening / closing mechanism unit 50. And a ground fault trip driving unit 120 for driving the opening and closing mechanism unit 50 so as to receive a signal from the electronic circuit unit 114 in the peripheral device and cut off the converter.

At this time, the enclosure case 10 and the cover 20, fixed conductors 71, 81, 91, 101, arc chamber 40, opening and closing mechanism 50, handle 60, trip mechanism 70 The components of the (80), (90) and (100) are a series of components for performing a circuit breaker (MCCB) -related performance, detailed configuration will be omitted.

In addition, the components of the earth leakage detector 110, which plays a major role in configuring an integrated 4-pole earth leakage breaker of one unit type in the combined 4-pole earth leakage breaker according to the present invention, will be described in detail as follows.

The trip mechanisms 70, 80, 90, and 100 have fixed conductors 71, 81, 91, and 101 for connecting with a conductor bar 72, which is a conductor penetrating through the ZCT 113. The two parts are preferably connected in the form of welding.

In addition, the conductor bar 72, which is a conductor penetrating the ZCT 113 having an inner diameter in the shape of a circle, is preferably implemented in a 1/4 circle shape as shown in FIG. 6 in order to maintain the current density most effectively.

The conductor bar 72 penetrating the ZCT 113 is a busbar-type load side terminal block 130, 140, 150, 160 by a hexagon socket bolt or screw 170. It is preferable to be connected and fixed with.

The ZCT 113 and the electronic circuit 114 have grooves for receiving conductors 71, 81, 91, 101, etc. for connecting to the conductor bar 72, and the ZCT 113 and A conductor insulator which insulates and fixes the conductor bar 72 in any one of "+", "x", and "-" while accommodating the electronic circuit unit 114 and the internal wiring wire. It is embedded in the ground fault detecting base 110a and the base cover 110b including the 300.

In addition, the ground fault detection base 110a and the base cover 110b are provided with the groove | channel which accommodates the terminal block 130,140,150,160 of the power supply part side.

That is, the ground fault detecting base 110a and the base cover 110b are formed by tripping mechanisms 70, 80, 90, 100, and terminal blocks 130, 140, 150 by hexagon socket bolts or screws 170. Parts up to 160 are configured in a unit form.

With this configuration, the volume ratio is 8.5: 1 when comparing the product with the volume of the present invention based on the same rated capacity when the 4-pole earth leakage breaker is constructed by the conventional method (combination of 4P MCCB and peripheral devices). As a level, the volume is reduced by about 85%.

In addition, as shown in FIG. 8, in the system equipment using both the three-phase load and the single-phase load, the three-phase electric leakage circuit breaker and the two-pole earth leakage breaker are used in parallel due to problems such as space and cost. The conventional circuit configuration as in Example 1) can be replaced by an integrated four-pole earth leakage breaker according to the present invention as shown in FIG. 8 (Example 2).

When described in detail with reference to the accompanying drawings the operation of the earth leakage breaker according to the present invention configured as described above.

First, the detection of overcurrent, short circuit fault current, and the like and the disconnection of the converter are the same as the operation of the circuit breaker for general wiring, and the detection of the short circuit, the electric shock current, and the disconnection of the converter are the same as those described with reference to FIGS. 1 and 2.

However, the conventional ground fault circuit breaker is an insulator (enclosure 10 and cover 20) capable of accommodating a series of components that perform the ground fault interruption function, while all the operations are all made by a combination of parts externally. It is built in)), which is different from the prior art.

In other words, a fault current such as a short circuit or an electric shock is detected by the ZCT 113, and the detected signal is judged / amplified by the electronic circuit 114 to open and close through the short circuit trip driver 120 when the fault current is detected. The mechanism unit 50 is operated to block the converter.

7 is a perspective view of an assembly of an earth leakage detector of a four-pole earth leakage breaker having a separate earth leakage detector according to another embodiment of the present invention, and a perspective view of an assembly of the ZCT 113 and the electronic circuit unit 114, and ZCT; 113 is a cross-sectional view.

As shown in FIG. 7, the conductor bar 72, which is a conductor penetrating through the ZCT 113, is not divided into quarters (1/4 circle) of the inner diameter of the ZCT 113 when the rated current on the circuit of the earth leakage breaker is small. It is possible to respond in the form of a circle.

In addition, instead of deleting the ground fault detecting base 110a and the base cover 110b, the electrical insulation portion 300 corresponds to the conductor insulation portion 300 that insulates the conductors penetrating the inside of the ZCT 113. The circuit board unit 200 and the second circuit board unit 201 may be separated and connected by wiring.

The circuit breaker according to the present invention as described above has the following effects.

First, by minimizing the size of the distribution box, cost reduction, and the load system by providing a compact all-in-one earth leakage circuit breaker by incorporating components which perform overload, short circuit, and earth leakage interrupting function in the case and cover, which are integral insulators, .

Second, the product and volume ratio of the product of the present invention is 8.5: 1 based on the same rated capacity when configuring a 4-pole earth leakage breaker by a conventional method (combination of 4P MCCB and peripheral devices), which has a volume reduction effect of about 85%. .

Third, the conventional circuit configuration of a three-pole earth leakage breaker and a two-pole earth leakage breaker in parallel in a system apparatus using both a three-phase load and a single-phase load by solving problems of space and cost, etc. Accordingly, it can be configured by replacing one of the integrated four-pole earth leakage breaker.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 is a circuit diagram showing a circuit breaker using a conventional 4P MCCB and a single-phase two-wire ELCB in parallel

2A, 2B, and 2C are diagrams illustrating a ground fault circuit breaker combining a 4P MCCB and peripheral devices according to the prior art;

2D and 2E are wiring diagrams of a ground fault breaker combining a 4P MCCB and peripheral devices according to the prior art.

Figure 3a, 3b is a view showing the ZCT and through-conductor shape of the earth leakage breaker according to the prior art

4A and 6 are cross-sectional views of a four-pole earth leakage breaker according to the present invention.

Figure 4b, 4c is a perspective view of a four-pole earth leakage breaker of one unit type according to the present invention

5 is an assembled view and a perspective view of a four-pole earth leakage breaker according to the present invention;

7 is another embodiment of the assembled view and perspective view of a four-pole earth leakage breaker of the unit type according to the present invention;

8 is a circuit diagram showing a circuit breaker using a 4P MCCB and a single-phase two-wire ELCB in parallel according to the present invention;

* Explanation of symbols for main parts of the drawings

10: enclosure case 20: enclosure cover

40: arc chamber 50: opening and closing mechanism portion

60: handle 70, 80, 90, 100: trip mechanism

71, 81, 91, 101: fixed conductor 72: conductor bar

110: leakage detection unit 113: ZCT

114: electronic circuit portion 120: earth leakage trip drive portion

130, 140, 150, 160: terminal block 200, 201: circuit board

300: conductor insulation

Claims (6)

A fixed contactor connected to a power source or a load side, a movable contactor capable of moving to a position for closing a circuit in contact with the fixed contactor or a position separated from the fixed contactor to open a circuit between a power supply and a load, and the movable contactor An opening / closing mechanism portion for driving to a position, a tripping mechanism portion for detecting abnormal current in the circuit to drive the opening / closing mechanism portion to a trip position, and a driving mechanism portion for driving the opening / closing mechanism portion to a trip position by detecting a short circuit on the circuit. In the earth leakage breaker provided with an earth leakage detection unit, all of which are incorporated in an enclosure case and a cover of an insulating material, The earth leakage detector; A conductor bar having four rod electrodes, each electrode electrically connected to the power supply side and the load side to provide a converter from the power supply side to the load side, the conductor bar having a quarter-circular cross section; A busbar-shaped fixed conductor connected to the conductor bar and connecting the power supply-side converter to the conductor bar; A bus bar terminal block connected to the conductor bar and connecting the load-side converter to the conductor bar; Zero Current Transformer (ZCT) which penetrates the conductor bar and detects and outputs an electric leakage on a circuit flowing through the conductor bar; An electronic circuit unit configured to determine and amplify the output signal from the ZCT to provide an output signal for determining whether the trip mechanism unit is driven; A groove for accommodating the high conductor and the terminal block and a conductor insulator having a “+” type to insulate between the plurality of bar electrodes of the conductor bar, and a ground fault detection base and a base cover incorporating the ZCT and the electronic circuit unit; Earth leakage breaker, characterized in that comprising a. delete delete delete delete delete