KR20140105934A - A earth leakage circuit breaker with a selection switch - Google Patents

Abstract

The present invention relates to an earth leakage circuit breaker with a selection switch in order to reduce installation costs and customer service costs by comprising the selection switch capable of selecting according to the rated current sensitivity in one breaker. The earth leakage circuit breaker tripped according to the leakage current generated in a power line, is configured to comprise: a first trip unit configured in the interior of the earth leakage circuit breaker and tripped in response to the first rated current sensitivity; a second trip unit configured in the interior of the earth leakage circuit breaker and tripped in response to the second rated current sensitivity different from the first rated current sensitivity; and the selection switch configured in the exterior of the earth leakage circuit breaker and selecting the first trip unit or the second trip unit according to the first rated current sensitivity or the second rated current sensitivity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an earth leakage breaker having a selection switch,

The present invention relates to an earth leakage circuit breaker, and more particularly, to a method and apparatus for selectively using a 30 mA or 15 mA differential in rated sensitivity current in an extra-high voltage circuit, a low voltage circuit, a motor control panel, a distribution board, And a selector switch for reducing the number of switches.

In general, the earth leakage breaker is a unit that integrates an opening / closing mechanism and a trip device in an insulating container. It can open or close the electric current in the energized state manually or electrically, and automatically cut off the current when an overload, It says.

These leakage circuit breakers play an important role in protecting load facilities and personnel by detecting abnormal currents in case of leakage current, ground fault, human electric shock accident, and short circuit current.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a conventional zero current transformer (ZCT) for detecting a short circuit (GR).

As shown in FIG. 1, the conventional art video transformer is configured such that all the imaginary line lines (R phase, S phase, and T phase) pass through the video current transformer, and the primary side power source Is detected as a small voltage through the secondary winding coils to judge whether or not a short circuit is present.

That is, the three-phase power source (R, S, T) passing through the copper of the core wound with the winding coil of the video current transformer has a phase difference of 120 degrees, and the phase of any one of the three- In the case of this image, the sum of the phases of the remaining two power supply voltages becomes zero voltage, and the image current transformer judges whether or not a short circuit is caused by the vector sum in the waveform of the power supply voltage of each phase.

At normal time, there is no problem because the vector sum of the currents flowing into and out of the load through the commercial line (R phase, S phase, T phase) is the same, but when there is a leakage current, Is detected as a leakage current through the video current transformer.

FIG. 2A and FIG. 2B are circuit diagrams showing an internal configuration of an earth leakage breaker according to the related art. FIG. 2A and FIG. 2B illustrate an earth leakage breaker using rectified power supplied through a full-wave rectifier circuit.

2A, the power supplied to the earth leakage breaker and subjected to full wave rectification is input to a control power source for driving the electrical leak detecting IC 10, and the electrical leak detecting IC 10 detects the electrical leak current It is judged from the fine output voltage whether or not a leakage current has occurred. In the illustrated state, since the power supply lines L1 and L2 are not energized at all times by the bridge circuit, the solenoid coil, that is, the trip coil 30 is not magnetized.

Referring to FIG. 2B, when the leakage current state is determined through the fine voltage detected by the current transformer 10 in the leakage current detection IC 10, the voltage is applied to the solenoid coil or the trip coil 30 in the earth leakage breaker The gate signal is sent to the thyristor (SCR, 20) so as to block the contact of the earth leakage breaker connected to the constant power source.

In other words, when the leakage current is judged to be a short circuit by the fine voltage detected through the video current transformer in the leakage detection IC 10 and the gate signal is sent to the thyristor 20, the thyristor 20 is switched, The voltage is applied to the trip coil 30 as shown in the figure, and the trip device (not shown) is driven to open the contact of the earth leakage breaker.

However, the leak detecting IC 10 always maintains an on state in order to determine whether or not a leakage current is generated through the fine voltage detected by the image current transformer. Accordingly, the leakage detecting IC 10 is provided with an on- Power is constantly supplied to maintain the state, and even when a short circuit does not occur, there is a problem that standby power is always consumed through the leakage detection IC 10.

That is, most households or buildings are equipped with distribution boards, etc., and the amount of power consumed by the standby power due to the power supplied to the leakage detection IC of the earth leakage breaker is always considerable, so that unnecessary waste of the power generation capacity Resulting in problems.

In addition, when the rated sensitivity current is changed in the field where the circuit breaker is installed, the circuit breaker is replaced at the same time, resulting in an additional cost of repairing and A / S, resulting in an increase in cost.

For example, if the earth leakage breaker is to be tripped according to the inherent rated sensitivity current, for example, if the rated leakage current of 30mA or 15mA is installed and a change is made to 30mA or 15mA, an additional earth leakage breaker is purchased Because they have to be reinstalled, they will incur additional installation costs as well as additional costs.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems, and it is an object of the present invention to provide an earth leakage breaker having a selection switch provided with a selection switch selectable according to a rated sensitivity current, It has its purpose.

According to an aspect of the present invention, there is provided an earth leakage breaker having a selector switch, the earth leakage breaker being tripped according to a leakage current generated in a main power line, A second trip unit configured to trip in accordance with a second rated sensitivity current different from the first rated sensitivity current and configured to be in the inside of the earth leakage breaker; And a selection switch for selecting the first trip unit or the second trip unit according to a current or a second rated sensitivity current.

The earth leakage breaker having the selection switch according to the present invention has the following effects.

In other words, it is possible to reduce the installation cost and the A / S cost by providing a selection switch which can select one breaker installed in the special high voltage class, the low voltage class, the motor control panel and the distribution board according to the rated sensitivity current.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a conventional zero-current transformer (ZCT) for detecting a short circuit (GR)
2A and 2B are circuit diagrams showing an internal configuration of a circuit breaker according to the related art
3 is a plan view schematically showing an earth leakage breaker having a selection switch according to the present invention.
4 is a block diagram schematically showing an earth leakage breaker having a selection switch according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an earth leakage breaker having a selection switch according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each component shown may be exaggerated or reduced . Also, for the sake of brevity of the sentence, the parentheses and component numbers following the component names are omitted when it is easy to understand what the referred components refer to in the context of the preceding and following.

FIG. 3 is a plan view schematically showing an earth leakage breaker having a selection switch according to the present invention, and FIG. 4 is a diagram schematically showing an earth leakage breaker having a selection switch according to the present invention.

As shown in FIGS. 3 and 4, the leakage circuit breaker having the selection switch according to the present invention detects a leakage current when a leakage current occurs in the main power line, outputs a leakage current detection signal in the leakage current detection unit, A first trip unit 110 provided in the earth leakage breaker 100 and tripped according to a first rated sensitivity current, and a second trip unit 110, A second trip unit 120 which is provided inside the electric circuit breaker 100 and is tripped according to a second rated sensitivity current different from the first rated sensitivity current; And a selection switch 130 for selecting the first trip unit 110 or the second trip unit 120 according to the second rated sensitivity current.

Here, a main switch 140 constituted by a dip switch is formed at the center of the earth leakage breaker 100 so that the manager can manually turn on / off the switch. The main switch 140 is configured to artificially cut off the power supplied from the main power line regardless of the leakage current, if necessary. At this time, the main switch 140 can automatically shut off the power supplied from the main power line when a leakage current occurs as well as manually.

The first rated sensitivity current for tripping the first trip unit 110 is 30 mA and the second rated sensitivity current for tripping the second trip unit 120 is 15 mA. The sensitivity current may be 15 mA, and the second rated sensitivity current may be 30 mA. In addition, although the rated sensitivity current of 30 mA or 15 mA is described in the embodiment of the present invention, the rated sensitivity current may have a different value of the sensitivity current.

The selection switch 130 is a switch for selecting the first trip unit 110 or the second trip unit 120. A user can select any desired dip switch on the circuit board without changing hardware .

The selection switch 130 is provided on one side of the cover of the earth leakage breaker 100. First and second rated sensitivity current values are displayed on one side of the cover, The first rated sensitivity current or the second rated sensitivity current is selected by the operation.

On the other hand, the earth leakage breaker 100 detects the occurrence of a short circuit in a low-voltage circuit of a power transmission / distribution panel or a power distribution or distribution line in an electric motor control panel or a distribution panel from a voltage and a current applied to a power distribution or distribution line in a low- , When a short circuit occurs in a specific power distribution or power transmission line, the power supply to the power distribution or distribution line is cut off by tripping the circuit breaker of the power distribution line or the power distribution line where the short circuit has occurred, or the occurrence of the short circuit is transmitted to the network To a central management unit (not shown).

Generally, a short circuit is a phenomenon in which a covering of a distribution or distribution line is damaged and a current is leaked to the ground through this portion. For example, a difference between a current input to a distribution or distribution line and a current output from a distribution or distribution line occurs It is determined that a leakage current has occurred when a leakage current equal to or greater than the rated sensitivity current flows to trip the circuit breaker of the power distribution or distribution line where the leakage current has occurred and to cut off the power supply to the distribution or distribution line.

At this time, if the electric leakage is generated, it can be implemented that the occurrence of a short circuit in the electric distribution or distribution line is audible through an auditory method or a visual method through an LED or the like.

Therefore, the earth leakage breaker equipped with the selection switch according to the present invention can be used as a low-voltage switch in a switchboard or in a control panel of a motor control panel or in a distribution panel, or to warn the user when an abnormality occurs due to short- It is possible to actively cope with the occurrence of abnormality of the power system, thereby minimizing the damage spread, and it is possible to efficiently manage the power supply of the power system such as energy saving.

In addition, it is not necessary to provide a separate earth leakage breaker according to the rated sensitivity current, and the user selects and uses the required rated sensitivity current by operating the selection switch 130 composed of the dip switch, thereby reducing installation cost and A / S cost There is a number.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

100: earth leakage breaker 110: first trip portion
120: second trip section 130: selection switch
140: Main switch

Claims (4)

1. An earth leakage breaker which trips according to a leakage current generated in a main power line,
A first trip unit provided in the earth leakage breaker and tripped according to a first rated sensitivity current;
A second trip unit configured to be tripped in accordance with a second rated sensitivity current different from the first rated sensitivity current,
And a selection switch provided outside the earth leakage breaker to select the first trip unit or the second trip unit according to the first rated sensitivity current or the second rated sensitivity current. breaker. The circuit breaker according to claim 1, wherein the first rated sensitivity current is larger than the second rated sensitivity current. The circuit breaker according to claim 1, wherein the first rated sensitivity current is smaller than the second rated sensitivity current. The earth leakage breaker according to claim 1, wherein the selection switch is a dip switch.

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