KR101580593B1

KR101580593B1 - Circuit breaker for uninterruptible power test

Info

Publication number: KR101580593B1
Application number: KR1020150065630A
Authority: KR
Inventors: 이상규
Original assignee: (주)오엔앰 코리아
Priority date: 2015-05-11
Filing date: 2015-05-11
Publication date: 2015-12-28

Abstract

The present invention relates to a circuit breaker capable of performing an uninterruptible power test, and more particularly, to a circuit breaker capable of performing an uninterruptible power test which can inspect a circuit breaker when main power is not interrupted. To solve the subject above, the circuit breaker capable of performing the uninterruptible power test according to the present invention comprises: an interruption unit which controls the power source of a power system by being connected with a protection relay and includes a first input switch and a first opening switch; an opening and closing unit which controls power of the power system by being connected with the protection relay, is connected with the interruption unit in parallel, and includes a second input switch and a second opening switch; and a circuit breaker which includes a test button to inspect the interruption unit and the opening and closing unit. Only if the opening and closing unit is inputted into the power system according to an on-motion of the test button, an opening switch for the interruption unit is operated.

Description

{CIRCUIT BREAKER FOR UNINTERRUPTIBLE POWER TEST}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker capable of performing an uninterruptible power supply, and more particularly, to a circuit breaker capable of performing an uninterruptible power supply check without interrupting main power.

The circuit breaker functions to maintain safety by interrupting the electrical connection to abnormal conditions such as overload, short circuit and short circuit while opening and closing the current. The types of circuit breaker include cover knife switch, wiring breaker and earth leakage breaker.

If the breaker fails to perform its normal operation, it will lead to damage and failure of the power equipment and the power can not be stably supplied. Therefore, the shutoff device is required to perform the inspection periodically.

(OCB) and gas circuit breaker (GCB) used in high-voltage and high-current currents are used for power system And the inspection is performed.

At this time, the inspection of the circuit breaker is performed by cutting off the current on the wiring side (load side), disconnecting the circuit breaker from the system, and checking the separated circuit breaker. Therefore, during the inspection of the circuit breaker, there is a problem that the power is cut off at the wiring side.

In order to solve the above-described problems, a circuit breaker is disclosed in Japanese Patent Application Laid-Open No. 10-0990860, which can be inspected without interrupting the main power source, and a leakage checking method is disclosed.

The conventional circuit breaker includes function check switching means provided between an output terminal of a rectifying circuit and an input terminal of a leakage current detecting portion between a trip coil and a leakage current detecting portion to selectively output a normal leakage current and an artificial leakage current to the leakage current detecting portion, ; Supply current limiting means for preventing a sufficient electromotive force from operating the trip coil from the function check switching means; And operation state checking means for indicating a state in which the function of the earth leakage breaker is checked.

However, the above-described technique is effective in checking the leakage current detecting unit for detecting an abnormal current, but it is impossible to check whether the trip coil operates or not.

Further, even when the breaker is replaced according to an abnormal operation of the breaker, the breaker must be disconnected from the power system and then replaced.

On the other hand, there is a case in which the constant power is to be supplied depending on the type of equipment on the load side. For example, nuclear power plants and smelting plants must be supplied with power at all times. Circuit-breakers installed in the power system, where power is always supplied, can not be inspected. That is, the breaker installed in the power system to which the constant power is to be supplied can not be replaced and inspected after the breaker is installed, and the breaker may be mechanically fixed. Such mechanical fastening causes a problem that the function of the breaker is lost and the load side can not be protected against the abnormal current.

KR 10-0990860 B1 2010.10.25.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit breaker capable of checking the operation of a circuit breaker by uninterruptible power supply and performing maintenance in an uninterrupted state when necessary There is.

Another object of the present invention is to provide a circuit breaker capable of preventing uninterruptible power supply from being interrupted by an operation error of the user when inspecting the circuit breaker.

In order to solve the above-described problems, the present invention provides a circuit breaker capable of performing an uninterruptible inspection, comprising: a cut-off part interlocked with a protective relay to cut off a power of the power system and constitute a first closing switch and a first opening switch; An opening / closing unit interlocked with the protection relay to intermittently power the power system, and connected in parallel with the shutoff unit, wherein the second closing switch and the second opening switch are formed; And a circuit breaker including a test button for checking the breaker and the opening and closing part, and only when the opening and closing part is inserted into the power system according to the on-operation of the test button, .

In addition, when the cut-off portion and the opening / closing portion are put in the power system, when the open coil of the cut-off portion is excited while the test button is turned on, the second open switch of the open / .

According to the present invention, since the breaker can be checked in the uninterrupted state, there is an advantage that power can be continuously supplied to the load even when the breaker is checked.

In addition, it is possible to continuously supply electric power to the load even when replacing according to an error or lifetime due to an abnormal operation of the circuit breaker, and thus it is possible to maintain a healthy state of the circuit breaker, have.

In addition, there is an advantage that a power failure due to a user's mistake can be minimized when the breaker is operated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a disconnection diagram of a power receiving facility to which a breaker capable of performing an uninterruptible inspection according to the present invention is applied; FIG.
2 is a wiring configuration diagram of a breaker capable of performing an uninterruptible maintenance according to the present invention.
3 is a schematic diagram of a circuit breaker capable of performing an uninterruptible maintenance according to the present invention.
Fig. 4 is a circuit diagram showing a control circuit of a breaking part in a breaker capable of performing an uninterruptible inspection according to the present invention. Fig.
5 is a circuit diagram showing a control circuit of an opening / closing part in a circuit breaker capable of performing an uninterruptible inspection according to the present invention.

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

The present invention relates to a circuit breaker capable of checking the breaker without shutting off the main power or performing an uninterruptible inspection capable of maintaining the breaker when an error occurs due to the check.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a disconnection diagram of a power reception facility to which a breaker capable of performing an uninterruptible inspection according to the present invention is applied.

Referring to FIG. 1, an uninterruptible maintenance and replaceable circuit breaker 10 according to the present invention is associated with a protection relay 20 to excite a trip coil according to a signal transmitted from the protection relay. At this time, the protection relay can be composed of overcurrent relay (OCR), ground fault relay (GR), ground overcurrent relay (OCGR), overvoltage ground relay (OVGR), overvoltage relay (OVR) and under voltage gauge (UVR).

FIG. 2 is a wiring diagram of an uninterruptible power supply checkable and interchangeable circuit breaker according to the present invention, and FIG. 3 is a schematic diagram of a circuit breaker capable of performing an uninterruptible power supply check according to the present invention.

Referring to FIG. 2, the uninterruptible power supply control and interchangeable circuit breaker 10 according to the present invention includes a blocking unit 100, an opening / closing unit 200, and a test button 300.

The blocking unit 100 includes a first closing switch 110 and a first opening switch 120 interlocked with the protection relay 20 to interrupt power of a power system. At this time, the first closing switch 110 is connected to the closing coil 115, and the first opening switch 120 is connected to the opening coil 125 (TC (Trip Coil)).

That is, according to the operation of the first closing switch 110, the closing coil 115 is excited to supply electric power by connecting the converter, and the opening coil 125 is excited according to the operation of the first opening switch 120 The power is cut off by opening the converter.

Of course, the open coil 125 is excited by a signal transmitted from the protection relay 20 to cut off power.

The blocking unit 100 is provided with a first ammeter 150 for detecting a current flowing through the blocking unit 100. At this time, the first ammeter 150 may be installed through a current transformer (CT), and the current flowing through the shielding unit 100 is visually checked. In addition, the first ammeter 150 can confirm the electric power supply state.

The opening and closing part 200 includes a second closing switch 210 and a second opening switch 220 interlocked with the protection relay 20 to intermittently supply power to the power system. At this time, the second closing switch 210 is connected to the closing coil 215 and the second opening switch 220 is connected to the opening coil 225 (TC (Trip Coil)).

That is, according to the operation of the second closing switch 110, the closing coil 215 is energized to supply electric power by connecting the converter, and the opening coil 225 is excited according to the operation of the second opening switch 220 The power is cut off by opening the converter.

Of course, the open coil 225 is also excited by a signal transmitted from the protection relay 20 to cut off power.

The opening and closing part 200 is provided with a second ammeter 250 which performs the same function as the blocking part 100. The second ammeter 250 performs the same function as the first ammeter 150 and will not be described in detail.

Here, the first closing switch 110 and the first opening switch 120 may be connected to each other by an interlock device to prevent the first closing switch 110 and the first opening switch 120 from operating simultaneously. Alternatively, the first closing switch 110 and the first opening switch 120 may be composed of a selector switch. In addition, the second closing switch 210 and the second opening switch 220 may be connected to an interlock device or may be configured as a selector switch so as not to be simultaneously operated.

The cut-off part 100 and the opening and closing part 200 are connected in parallel to the power system, and are operated independently in the normal operation state.

That is, in the normal operation state, the shutoff unit 100 and the shutoff unit 200 can be operated by putting the selected shutoff unit into the power system, and if necessary, the shutoff unit 100 and the shutoff unit 200 can simultaneously System.

For example, when the cut-off unit 100 is put into the power system alone, the open coil 125 of the cut-off unit 100 is excited according to a signal of the protective relay 20 to cut off the power. The open coil 125 of the shut-off unit 100 and the open coil 225 of the shut-off unit 200 are opened and closed according to a signal from the protective relay 20, ) Are simultaneously excited to cut off the power.

In the normal operation state, the blocking unit 100 and the opening / closing unit 200 perform independent operations according to the user's operation (opening and closing operation). However, in order to perform maintenance work such as checking or replacing the blocking part of one side in the uninterrupted state, at least one blocking part must be put into the power system.

The test button 300 performs a function for checking the cutoff unit 100 in an uninterrupted state.

That is, the test button 300 performs a function of providing a state in which the open switch to the breaker 100 can be operated only when the opening and closing part 200 is inserted into the power system according to the on-operation .

At this time, the test button 300 may be configured as a push-button, but may also be a selector switch and a toggle switch.

The test button 300, which is operated in conjunction with the blocking unit 100 and the opening / closing unit 200, will be described later.

3 is a schematic diagram of a circuit breaker capable of performing an uninterruptible power supply according to the present invention.

3, a circuit breaker 10 capable of performing an uninterruptible power supply is provided between a hydraulic circuit 11 connected to an electric power reception power line and a discharge electric circuit 12 connected to a power distribution electric power line, (200) are connected. Here, the blocking portion 100 and the opening / closing portion 200 are connected in parallel.

The blocking portion 100 and the opening / closing portion 200 may be symmetrically connected to each other.

One end of the cut-off portion 100 is electrically connected to the hydrostatic lamp 11. The other end of the shielding portion 100 is electrically connected to the discharge electric path 12, respectively.

The blocking unit 100 is provided with a first ammeter 150 for detecting a current flowing through the blocking unit 100. The opening and closing unit 200 is provided with a second ammeter 150 for detecting a current flowing through the blocking unit 100, An ammeter 250 is installed.

4 is a view showing a control circuit of a breaker in a breaker capable of performing an uninterruptible inspection according to the present invention.

The control circuit of the blocking portion will be described with reference to Fig. 4 attached hereto.

The control circuit of the shutoff unit 100 includes a breaker open contact a 121 that excites the open coil 125 of the shutoff unit 100 in accordance with the operation of the first open switch 120, A test contact a 301 connected in series with the test button 300 according to an on-operation of the test button 300 and a test contact a 301 connected in series with the test contact a 301, A test contact b 302 and a test contact b 302 connected in parallel with the test contact a 301 and opened according to the on-operation of the test button 300, And a switching contact b 212 connected in series according to the operation of the second closing switch 210. The second current signal contact a 251, which is operated in response to the application of the current of the second ammeter 250, is connected in series with the switch contact a (211).

At this time, the test contact a (301) and the test contact b (302) are interlocked, and similarly, the switch closing contact a (211) and the closing contact closing contact b (212) are interlocked.

A protective relay contact a (21) for energizing the open coil (125) is provided by a signal transmitted from the protection relay (20).

In addition, a first closing contact a (111) for energizing the closing coil (115) is provided by the operation of the first closing switch (110).

The control process for the control circuit of the cut-off unit 100 constructed as above will be described as a normal operation and a test operation.

1-1. Normal operation

In the normal operation, the test button 300 is in an off-state.

In this case, the breaker open contact a (121) is connected by the operation of the first open switch (120) to energize the open coil (125). Also, the open coil 125 is excited by the protective relay contact a (21) operated on the signal generated in accordance with the operation of the protection relay 20.

That is, the opening coil is excited by the operation of the first opening switch, and the closing coil is excited by the operation of the first closing switch.

1-2. Test driving

In the test operation, the test button 300 is in the on-operation state.

When the test button 300 is turned on, the test contact a (301) is connected and the test contact b (302) connected to the test contact a (301) and the interlock device is opened.

The open coil 125 is not excited even when the breaker open contact a 121 is connected by the operation of the first open switch 120 in the ON state of the test button 300 alone. However, the open coil 125 is excited only by the protective relay contact a (21) operated on the signal generated in accordance with the operation of the protection relay 20.

At this time, when the breaker closing contact a 211 is connected by the operation of the second closing switch 210, the current is switched to a state in which a current can flow through the opening and closing part 200 (energized state) The second ammeter 250 is operated and the second current signal contact a 251 is connected. In this state, when the breaker open contact a (121) is connected by the operation of the first open switch (120), the open coil (125) is excited.

That is, in the test operation, the blocking unit 100 satisfies the condition that the switching unit 200 can be opened only when the switching unit 200 is connected to the power system and connected.

In addition, the breaker closing contact a (111) is connected by the operation of the first closing switch (110) to energize the closing coil (115) and the power line is connected according to the excitation of the closing coil (115).

5 is a diagram showing a control circuit of an opening / closing part in a circuit breaker capable of performing an uninterruptible inspection according to the present invention.

The control circuit of the opening / closing part will be described with reference to Fig. 5 attached hereto.

The control circuit of the opening and closing part 200 includes a test contact a 301 connected in accordance with the on-operation of the test button 300, a first connection part connected in series with the test contact a 301, The open coil 225 of the opening and closing part 200 is connected in series with the breaker closing contact a 121 and the breaker closing contact a 121 according to the operation of the second opening switch 220, And an opening contact a (221) for exciting the switch.

Also, a protective relay contact a (21) for exciting the open coil (225) is provided by a signal transmitted from the protection relay (20).

An opening / closing device closing contact a (211) for energizing the closing coil 215 by the operation of the second closing switch 210 is installed in parallel with the opening / closing relay contact a (221).

2-1. Normal operation

In the normal operation, the test button 300 is in an off-state.

In this case, the operation of the blocking unit 100 and the opening / closing unit 200 are independently operated. When the operation of the opening / closing unit 200 is examined only, since the test button 300 is not on-operated, The operation of the second open switch 220 and the operation of the second closing switch 210 are ignored. However, the open coil 225 is energized according to the signal of the protective relay contact a (21) operated by the protection relay 20.

2-2. Test driving

In the test operation, the test button 300 is in the on-operation state.

When the test button 300 is turned on, the test contact a (301) is connected.

If the breaker 100 is in the power state, the breaker closing contact a 121 is in an ON state, so that the operation of the second open switch 220 causes the breaker open contact a 221 to be connected to the open coil 225 ) Is excited.

That is, in the above state, when the breaker open contact a 221 is connected by the operation of the second open switch 220, the open coil 225 is excited.

Accordingly, in the test operation, the opening / closing part 200 satisfies the condition that the shutoff part 100 can be opened only when the shutoff part 100 is inserted into the power system and connected.

That is, when the blocking unit and the opening / closing unit are in the power system, if the open coil of the blocking unit is excited while the test button is ON, the second opening switch of the opening / do.

In addition, by the operation of the second closing switch 210, the closing contact 215a is energized by connecting the closing contact a (211), and the power line is connected according to the excitation of the closing coil 215.

According to the present invention, since the circuit breaker can be checked in the uninterrupted state under the test condition, the power can be continuously supplied to the load even when the circuit breaker is checked. Also, Can be supplied continuously. In addition, there is an advantage that the power failure due to the user's mistake can be minimized during the test operation of the circuit breaker.

In addition, the uninterruptible maintenance and replaceable circuit breaker according to the present invention can be applied not only to circuit breakers installed in a switchboard such as an OCB, a vacuum circuit breaker (VCB) and a gas circuit breaker (GCB) It is also applicable to a low-voltage circuit breaker including a wiring breaker (NFB, MCCB).

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 understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Breaker 11: Transmission line
12: Pre-discharge line 20: Protection relay
21: Protection relay contact point a 100:
110: first closing switch 111: breaker closing contact a
115: input coil 120: first open switch
121: Breaker open contact a 125: Open coil
150: first ammeter
200: opening / closing unit 210: second closing switch
211: closing contact input a 215: closing coil
220: second open switch 221: open / close contact a
225: Open coil 250: Second ammeter
251: Second current signal contact point a 300: Test button
301: Test contact a

Claims

A blocking unit 100 interlocked with the protection relay 20 to intermittently supply power to the power system and configure the first closing switch 110 and the first opening switch 120;
A switching unit 20 which is interlocked with the protective relay 20 to intermittently power the power system and is connected in parallel with the shutoff unit 100 and includes a second closing switch 210 and a second opening switch 220 200); And
A test button 300 for checking the blocking part 100 and the opening and closing part 200;
And a circuit breaker,
The first opening switch 120 for the blocking unit 100 is operated only when the opening and closing unit 200 is inserted into the power system according to the on-operation of the test button 300,
The control circuit of the cut-off unit (100)
A breaker open contact a (121) for exciting the open coil (125) of the cutoff part according to the operation of the first open switch (120);
A test contact a (301) connected in series to the breaker open contact a (121) and being in contact with the on-operation of the test button (300);
An activator closing contact a (211) connected in series with the test contact a (301) and being contacted according to the operation of the second closing switch (210);
A test contact b 302 connected in parallel with the test contact a 301 and opened according to the on-operation of the test button 300;
An activator closing contact b 212 connected in series with the test contact b 302 and being in contact with the operation of the second closing switch 210;
A second current signal contact a (251) connected in series to the switch contact a (211) and operated by a current application of the second ammeter (250) to make a contact;
An interlock connecting the test contact a (301) and the test contact b (302);
An interlock connecting the closing contact a (211) and the closing contact b (212);
A protective relay contact a (21) for energizing the open coil (125) of the interruption part by a signal transmitted from the protection relay (20); And
A first closing contact a (111) for energizing the closing coil (115) of the blocking part by the operation of the first closing switch (110);
Lt; / RTI >
The control circuit of the opening /
A test contact a (301) which is in contact with the on-operation of the test button (300);
A breaker closing contact a (121) connected in series with the test contact a (301) and being contacted according to the operation of the first open switch (120);
An open / close contact a (221) connected in series to the breaker closing contact a (121) and energizing the opening coil (225) of the opening / closing part (200) according to the operation of the second open switch (220);
A protective relay contact a (21) for exciting the open coil (225) by a signal transmitted from the protection relay (20); And
An activator closing contact a (211) installed in parallel with the opening / closing contact a (221) and energizing the closing coil (215) of the opening / closing part by operation of the second closing switch (210);
And a control unit for controlling the uninterruptible power supply.

The method according to claim 1,
The second open switch of the opening and closing part is switched to the sub operating state when the open coil of the shutoff part is excited while the cutoff part and the opening and closing part are put in the power system, Circuit breaker with uninterruptible power supply.