KR20170092052A - Fault current detecting apparatus for electric shortage testing of molded case circuit breaker - Google Patents

Fault current detecting apparatus for electric shortage testing of molded case circuit breaker Download PDF

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Publication number
KR20170092052A
KR20170092052A KR1020160013085A KR20160013085A KR20170092052A KR 20170092052 A KR20170092052 A KR 20170092052A KR 1020160013085 A KR1020160013085 A KR 1020160013085A KR 20160013085 A KR20160013085 A KR 20160013085A KR 20170092052 A KR20170092052 A KR 20170092052A
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KR
South Korea
Prior art keywords
fault current
bus bar
limiting resistor
resistance value
circuit breaker
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Application number
KR1020160013085A
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Korean (ko)
Inventor
김홍룡
황찬문
Original Assignee
엘에스산전 주식회사
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Application filed by 엘에스산전 주식회사 filed Critical 엘에스산전 주식회사
Priority to KR1020160013085A priority Critical patent/KR20170092052A/en
Publication of KR20170092052A publication Critical patent/KR20170092052A/en

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    • G01R31/025—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies

Abstract

The present invention provides a fault current detection device for both of an AC / DC current for a circuit breaker short circuit test which is safe and easy to select a fault current limiting resistor. The fault current detection device for a circuit breaker short circuit according to the present invention comprises: sieve; A fault current limiting resistor having a plurality of output connecting terminals for limiting the fault current and varying the resistance value; And a plurality of output terminals connected to a plurality of output connection terminals, wherein the common terminal is connected to the input connection terminal of the fault current limiting resistor, and the plurality of output terminals are connected to the common terminal and the plurality of output terminals, And a resistance value selection terminal for providing a means for selecting a value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fault current detection apparatus for a short-

The present invention relates to a short-circuit test apparatus for a circuit breaker for wiring (hereinafter, abbreviated as a wiring breaker), and more particularly to a fault current detection apparatus for both AC / DC current for a short circuit breaker for a wiring breaker, will be.

A circuit configuration of a short circuit test apparatus for a wiring breaker will be described with reference to FIG.

Fig. 1 shows a short-circuit testing apparatus for a circuit breaker for AC wiring. However, when a circuit breaker for direct current is provided, a part of the means for measuring the phase voltage and a part of the line are removed. A short-circuit test device may be constructed.

(S) and a load (5) are connected to both ends of the test line (TL) of three phases, and a current transformer (6) for three-phase load current measurement is provided at the rear end of the load (5).

A short circuit test object wiring circuit breaker (sample) 4 is provided between the power source S and the load 5.

A voltage measuring device 1 for measuring a voltage can be provided between a U phase test line TL and a V phase test line TL and a voltage sensor 2 for detecting an interphase voltage is provided between the phases of the three phases Can be installed.

A voltage sensor 3 for detecting each phase voltage may be connected to a test line TL connected to the power source side and the load side terminal of the sample 4.

A calibration wire TC which can be temporarily connected in parallel to the circuit of the sample 4 can be connected.

The short-circuit test operation of the short-circuit test apparatus for a wiring breaker constructed as described above is as follows.

That is, it is checked whether the trip 4 (TRIP, automatic circuit breaker) operation of the sample 4 is in operation with the short circuit current applied to the test line TL through the power source S, (A zero voltage is detected at the time of energization and a phase voltage greater than zero is detected after the trip), and the phase voltage output from the voltage sensor 2 The detection signal is read.

Also, the tripped phase current output from the current transformer 6 is read by a monitoring device not shown (the phase current should be zero after the trip).

On the other hand, a fault current (short-circuit current) may flow through the enclosure due to an arc or other cause.

In order to detect such a fault current, a fault current detection device is required, and a fault current detection device 100 according to the prior art can be installed between the power source side neutral pole and the outer case of the sample 4 in a short- .

The fault current detection apparatus 100 according to the prior art can be configured to include the fault current limiting resistor 101, the conductor 102, and the useable body 103. [

 The fault current limiting resistor 101 can be selectively used as a resistor for limiting the fault current.

The conductor 102 may be constituted by a wire or a bus bar formed of, for example, a bare wire, as a means for electrically connecting the fault current limiting resistor 101 and the using body 103.

The solenoid 103 may be composed of, for example, a fuse that melts and breaks when a preset current, for example, a fault current of 1500 amperes, flows.

The fault current detection apparatus 100 according to the related art as described above can prevent the insulation abnormality of the enclosure of the sample 4 due to the meltdown of the permitting body 103 when a fault current flows in the enclosure of the sample 4 And it is confirmed by the tester that the insulation of the sample (4) is abnormal.

However, the conventional fault current detection apparatus for a circuit breaker short circuit according to the prior art has the following problems.

First, when the fault current limiting resistor 101 is exposed, there is a problem that if the fault current flows, the fault current limiting resistor 101 and the conductor 102 may be short-circuited due to the arc.

Secondly, when only one of the solenoid bodies 103 is used in the DC short-circuit test, there is a problem that a secondary accident (diffusion of a fault current) may occur due to a short insulation distance of only one of the solenoid bodies 103 melted and broken.

Third, when the fault current limiting resistor 101 is set in accordance with the expected fault current, the existing fault current limiting resistor is removed and a new connection and installation work is troublesome and takes a long time.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an AC / DC fault current detection device for a circuit breaker short circuit test which is safe and easy to select a fault current limiting resistor.

The object of the present invention is to provide a fault current detection device for a circuit breaker short-

A plurality of bus bars and a usable body;

A fault current limiting resistor having a plurality of output connecting ends arranged for a length of the resistor which limits the fault current and changes so that the resistance value changes; And

A common terminal connected to an input connection terminal of the fault current limiting resistor and a plurality of output terminals connected to a plurality of output connection terminals, And a resistance value selection terminal that provides a means for selecting a fault current detection device for a circuit breaker short circuit according to the present invention.

According to a preferred aspect of the present invention,

A first bus bar formed of an electrical conductor and providing a current path for a fault current of the circuit breaker;

A third bus bar formed of an electrical conductor and providing a current path for a fault current of the wiring breaker;

And a second bus bar formed of an electrical conductor and installed between the first bus bar and the third bus bar,

In the above-described solvable body,

A first usable body electrically connected between the first bus bar and the second bus bar and melted and broken when a fault current of the wiring breaker flows; And

And a second usable body that is electrically connected between the second busbar and the third busbar and is melted and broken when a fault current of the wiring breaker flows.

According to another preferred aspect of the present invention, a fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention comprises an internal connection terminal connected to the fault current limiting resistor and a third busbar, and an external connection terminal connected to the circuit breaker And a connection terminal.

According to another preferred aspect of the present invention, a fault current detection device for a circuit breaker short-circuiting test according to the present invention is characterized in that in order to electrically isolate the fault current limiting resistor from the resistance value selection terminal and the connection terminal, And a first insulation plate provided between the connection terminal and the fault current limiting resistor.

According to another preferred aspect of the present invention, there is provided a fault current detection apparatus for a short circuit breaker for a wiring breaker according to the present invention, comprising: a first fault current detector for detecting a fault current from a first bus bar, a second bus bar, a third bus bar, Wherein said fault current limiting resistor is electrically connected between said fault current carrying path including said first bus bar, said second bus bar, said third bus bar, said first usable body and said second usable body, And a second insulation plate provided on the second insulation plate.

According to another preferred aspect of the present invention, a fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention is characterized in that, in order to insulate the fault current limiting resistor from the rear, And a third insulating plate that is installed in the position.

According to another preferred aspect of the present invention, a fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention comprises: a bottom plate for supporting components constituting the fault current detection apparatus; And a plurality of first insulators installed on the bottom plate for electrically insulating the first bus bar, the second bus bar and the third bus bar from the bottom plate, respectively.

According to another preferred embodiment of the present invention, a fault current detection device for a short circuit breaker for a wiring breaker according to the present invention comprises a plurality of second insulators installed at a lower portion of the bottom plate to electrically insulate the bottom plate from the ground, .

According to another preferred aspect of the present invention, in a fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention, a plurality of resistance values are marked on an upper surface of a first insulation plate adjacent to the resistance value selection terminal, Marker or marking sticker (sticker) is attached.

According to another preferred aspect of the present invention, a fault current detection device for a circuit breaker short-circuiting test according to the present invention comprises a resistance value selection switch which can be selectively connected to any one of a plurality of output terminals of a resistance value selection terminal, And a control unit for outputting a control signal indicating the selected connection position to the resistance value selection switch in accordance with the set resistance value.

In the fault current detection device for a short circuit breaker test according to the present invention, since the number of solenoids is two, the insulation distance can be increased compared with the conventional technology using one solenoid.

The fault current detection device for a short circuit breaker for a wiring breaker according to the present invention has a plurality of output connection stages provided for each length of a resistance whose resistance value varies according to the length of the resistance, Therefore, it is possible to select the fault current limiting resistance through the resistance value selection terminal. By selecting the common terminal and the resistance value connection terminal among the resistance value selection terminals in the variable selection, it is possible to easily change the fault current limiting resistance It is possible to provide a possible effect.

The fault current detection apparatus for a short circuit breaker of a wiring breaker according to the present invention includes a connection terminal having an internal connection terminal and an external connection terminal so that the fault current limiting resistor and the fault current limiting resistor are connected to each other through a wire connected to the internal connection terminal and the internal connection terminal. The third bus bar can be easily connected or disconnected and the wiring breaker can be easily connected or disconnected through an external connection terminal and a wire connected to the external connection terminal.

The fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention further includes a first insulation plate provided between the resistance value selection terminal and the connection terminal and the fault current limiting resistor, And electrical connection from the connection terminal.

A fault current detection apparatus for a short circuit breaker for a wiring breaker according to the present invention is characterized by comprising a fault current conduction path including a first bus bar, a second bus bar, a third bus bar, a first usable body and a second usable body, And a second insulating plate provided between the first and second bus bars, the second bus bar, the third bus bar, the first usable body, and the second usable body so as to electrically isolate the fault current limiting resistor from the first bus bar, Effect can be provided.

The fault current detection apparatus for a circuit breaker short-circuiting test according to the present invention further includes a third insulation plate disposed at a position spaced a predetermined distance behind the fault current limiting resistor, so that the fault current limiting resistor can be insulated from the rear Can provide an effect.

The fault current detection device for a circuit breaker short-circuit test according to the present invention further includes a bottom plate and a first insulator provided on the bottom plate, so that the components of the fault current detection device can be supported by the bottom plate, 1 booth bar, the second booth bar and the third booth bar can be electrically insulated from the bottom plate by the first insulator, respectively.

The fault current detection device for a short circuit test for a circuit breaker according to the present invention further includes a plurality of second insulators provided below the bottom plate so that the bottom plate and the ground can be electrically insulated.

A fault current detection device for a short circuit breaker for a wiring breaker according to the present invention is characterized in that a plurality of resistance values are marked on a top surface of a first insulation plate adjacent to the resistance value selection terminals or marked with a marking or marking sticker, The resistance value of the resistor can be easily selected.

A fault current detection apparatus for a short circuit breaker for a wiring breaker according to the present invention comprises a resistance value selection switch which can be selectively connected to any one of a plurality of output terminals of a resistance value selection terminal, And a control unit that can output a control signal to the resistance value selection switch. Therefore, it is possible to provide an effect of automatically selecting a resistance value.

Fig. 1 is a circuit diagram showing the configuration of a short circuit test apparatus for a general wiring breaker and a fault current detecting apparatus for a short circuit test for a wiring breaker according to the prior art.
2 is a planar block diagram showing the configuration of a fault current detection apparatus for a short circuit breaker for a circuit breaker according to a preferred embodiment of the present invention,
3 is a circuit diagram showing a configuration of a fault current limiting resistor among fault current detection devices for a circuit breaker short circuit test according to a preferred embodiment of the present invention,
FIG. 4 is a perspective view of a fault current detection device for a short circuit breaker of a wiring breaker according to a preferred embodiment of the present invention,
5 is a front block diagram showing a frontal configuration of a fault current detection device for a circuit breaker short circuit test according to a preferred embodiment of the present invention,
FIG. 6 is a rear block diagram showing a rear configuration of a fault current detection device for a circuit breaker short-circuit test according to a preferred embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

FIG. 2 is a block diagram showing a configuration of a fault current detection device for a circuit breaker short-circuiting test according to a preferred embodiment of the present invention. FIG. 3 is a block diagram of a fault current detection device for a circuit breaker short- FIG. 4 is a perspective view of a fault current detection device for a circuit breaker short-circuit test according to a preferred embodiment of the present invention as viewed obliquely from a rear upper portion, and FIG. 5 is a perspective view of a preferred embodiment of the present invention FIG. 6 is a rear block diagram showing a rear configuration of a fault current detection apparatus for a circuit breaker short circuit according to a preferred embodiment of the present invention. FIG. 6 is a front block diagram showing a frontal configuration of a fault current detection apparatus for a short circuit test.

The fault current detection apparatus according to the present invention can be included in a short circuit test apparatus as shown in FIG. 1, and the configuration of a fault current detection apparatus for a circuit breaker short circuit according to a preferred embodiment of the present invention is shown in FIGS. 2 to 6 .

 2, which is a block diagram showing a configuration of a fault current detection apparatus for a circuit breaker short-circuiting test according to a preferred embodiment of the present invention, a fault current detection apparatus 100 for a circuit breaker short-circuit test according to a preferred embodiment of the present invention The first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first usable body 20a, the second usable body 20b, the fault current limiting resistor (30), a resistance value selection terminal (70), and a connection terminal (40).

Here, according to the embodiment, the AC circuit breaker can be constituted by one single solenoid, and the DC circuit breaker can be constituted by two as in the embodiment shown in Fig. This is because when the space between the first and second busbars 10a and 10b and between the second and third busbars 10b and 10c is about 50 millimeters depending on the embodiment, In particular, the direct current can occur only in the positive region, unlike the alternating current in which the positive and negative regions are alternately generated, and therefore, And to prevent the insulation breakdown phenomenon caused by the arc more securely.

The first busbar 10a is formed of an electrical conductor having a predetermined thickness and a rectangular planar shape, and provides a current path for the fault current of the circuit breaker.

The fault current may refer to a leakage current flowing through the enclosure of the circuit breaker during a short circuit test of the circuit breaker.

The first bus bar 10a is located on the leftmost side of the first bus bar 10a, the second bus bar 10b and the third bus bar 10c in Fig.

The third bus bar 10c is also formed of an electrical conductor having a predetermined thickness and a rectangular planar shape, and provides a current path for the fault current of the wiring breaker.

The third bus bar 10c is located on the far right side of the first bus bar 10a, the second bus bar 10b and the third bus bar 10c in Fig.

The second bus bar 10b is also formed of an electrical conductor having a predetermined thickness and a rectangular planar shape, and provides a current path for the fault current of the wiring breaker.

The second bus bar 10b is provided between the first bus bar 10a and the third bus bar 10c and is provided between the first bus bar 10a and the second bus bar 10b And the third bus bar 10c, as shown in Fig.

The first usable body 20a is electrically connected between the first bus bar 10a and the second bus bar 10b and melts and breaks when a fault current of the wiring breaker flows.

The first usable body 20a may consist of a fuse that melts and breaks when a current of a predetermined rated current or more flows according to a preferred embodiment. Here, the preset rated current may be, for example, 1350 amperes (A).

The second usable body 20b is a means that is electrically connected between the second bus bar 10b and the third bus bar 10c and melts and breaks when a fault current of the wiring breaker flows.

The second usable body 20b may be composed of a fuse that melts and breaks when a current of a predetermined rated current or more flows according to the preferred embodiment. Here, the preset rated current may be set to have a value equal to or less than the rated current set to the first useable body 20a, and may be, for example, 1300 amperes (A).

Accordingly, when the first usable body 20a is melted and the first usable body 20a fails to break due to a breakdown current of 1300 amperes, the second usable body 20b may melt and break if it has a large fault current.

The fault current limiting resistor 30 is a means for limiting the fault current, as shown best in Fig. 3, with a common input connection end (see the end connected to the portion indicated by reference numeral 71a) (See the portions connected to the positions indicated by 72a1, 72a2, 72a3, 72a4 and 72a5 in Fig. 3).

Therefore, when the rightmost output connection end (the end connected to the portion indicated by reference numeral 72a5) is selected in FIG. 3, the fault current limiting resistor 30 becomes the largest, and the common input connection end The fault current limiting resistor 30 becomes the smallest when the left output connection end (refer to the portion connected to the position indicated by 72a1 in Fig.

According to a preferred embodiment, the fault current limiting resistor 30 is a resistor that can limit the fault current to, for example, 1500 amperes (A), and a plurality of output connecting ends 72a1, 72a2, 72a3, 72a4, 72a5 The resistance value of the fault current limiting resistor 30 according to the varying length can be set to, for example, 0.085 ohms, 0.092 ohms, 0.15 ohms, 0.16 ohms, (?), 0.18 (?), 0.19 (?), 0.23 (?), 0.24 (?), 0.38 (?).

In order to assist the tester in selecting the plurality of resistance values according to the preferred embodiment, the plurality of resistance values are connected to corresponding output terminals (refer to the portion indicated by 72a in FIG. 2 or 4 in FIG. 2 or 4) A marking or marking marking marked or marked on the upper surface of the first insulating plate 51 to be described later may be attached at an adjacent position on the extension line forming the same row.

The resistance value of the fault current limiting resistor 30 may have nine values as shown in Figures 2 and 4 and as exemplified above according to the preferred embodiment, .

The resistance value selection terminal 70 includes common terminals 71 and 71a connected to the input connection end of the fault current limiting resistor 30 (an end connected to a portion indicated by 71a in Fig. 3) (72, 72a, 72a1, 72a2, 72a3, 72a3, 72a2, 72a3, 72a1, 72a2, 72a4, 72a2, 72a4 and 72a5 to selectively connect any one of the common terminals 71 and 71a and the plurality of output terminals 72 and 72a in FIG. 2, 72a1, 72a2, 72a3, 72a4 and 72a5 in FIG. To provide a means for selecting a resistance value.

In FIG. 4, the two upper and lower common terminals 71 and 71a are connected in series to each other. In FIG. 4, the upper and lower output terminals 72a and 72 of the same column are connected to each other in series.

Here, the selective connection of any one of the common terminals 71 and 71a and the plurality of output terminals (72 and 72a in FIG. 2, 72a1, 72a2, 72a3, 72a4 and 72a5 in FIG. 3) Similarly, one end of the fifth connection cable C5 is connected to the common terminal 71a and the other end is connected to one of the plurality of output terminals (the fourth output terminal when the rightmost output terminal is firstly shown in Fig. 4) .

The resistance value selection terminal 70 and the fault current limiting resistor 30 may be electrically connected by a plurality of sixth connection wires C6 as shown in Fig. 3, a portion corresponding to the plurality of sixth connection wires C6 is connected to the line connecting the fault current limiting resistor 30 and the common terminal 71a or the fault current limiting resistor 30 and the plurality of output terminals 72a1, 72a2, 72a3, 72a4, 72a5 are the corresponding parts.

The connection terminal 40 provides terminal means for electrically connecting the internal circuit of the fault current detection device or electrically connecting the external circuit breaker to be tested.

To this end, the connection terminal 40 includes an internal connection terminal 41 connected to the fault current limiting resistor 30 and the third bus bar 10c, and a wiring breaker (see reference numeral 4 in FIG. 1) And an external connection terminal 42 connected to the external connection terminal.

The internal connection terminal 41 and the external connection terminal 42 each have two terminals and the two terminals of the two internal terminals 41 and 42 are connected in series to each other .

2, the internal connection terminal 41 is electrically connected to one end of the fault current limiting resistor 30 through the second connection wire C2, and the third connection wire C3 is connected to the other end And is electrically connected to the third bus bar 10c.

The external connection terminal 42 can be electrically connected to the external side (ground side) of the circuit breaker, which is a sample, not shown, through the fourth connection cable C4.

In FIG. 2, reference symbol C1 designates a first connection wire for electrically connecting the other end of the fault current limiting resistor 30 to the first bus bar 10a.

According to a preferred aspect of the present invention, the fault current detection apparatus 100 for a circuit breaker short-circuit test according to a preferred embodiment of the present invention further includes a first insulation plate 51 as shown in FIG. 2 or 4 .

The first insulating plate 51 is provided as a means for electrically isolating the fault current limiting resistor 30 from the resistance value selecting terminal 70 and the connecting terminal 40. [

The first insulating plate 51 is installed between the upper surface of the fault current detection device in which the resistance value selection terminal 70 and the connection terminal 40 are provided and the lower fault current limiting resistance 30.

The first insulating plate 51 may be made of a synthetic resin material having electrical insulation according to the preferred embodiment.

A resistance value selection terminal 70 and a connection terminal 40 can be fixedly installed on the upper surface of the first insulation plate 51. A fault current limiting resistor 30 is installed in the lower chamber of the first insulation plate 51 .

According to a preferred aspect of the present invention, the fault current detection apparatus 100 for a circuit breaker short-circuit test according to a preferred embodiment of the present invention further includes a second insulation plate 52 as shown in FIG. 4 or 5 .

The fault current conduction path from the front fault current conduction path composed of the first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first allowable body 20a and the second allowable body 20b As a means for electrically insulating the current limiting resistor 30, a second insulating plate 52 is provided.

Therefore, the second insulating plate 52 includes the first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first allowable body 20a, and the second allowable body 20b Is provided between the fault current conduction path and the fault current limiting resistor (30). In other words, the second insulating plate 52 includes the first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first allowable body 20a and the second allowable body 20b Is provided in front of the facing fault current limiting resistor (30).

The second insulating plate 52 may be made of a synthetic resin material having electrical insulation according to the preferred embodiment.

The first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first allowable body 20a and the second allowable body 20b are provided in front of the second insulating plate 52 And a fault current limiting resistor 30 is located in the rear room of the second insulation plate 52. [

According to another preferred aspect of the present invention, the fault current detection apparatus 100 for a short circuit breaker for a circuit breaker according to a preferred embodiment of the present invention further includes a third insulation plate 53 as shown in FIG. 4 or 6 do.

The third insulating plate 53 is provided as means for insulating the fault current limiting resistor 30 from the rear.

Therefore, the third insulating plate 53 is installed at a position spaced a predetermined distance rearward from the fault current limiting resistor 30.

4, the third insulating plate 53 is connected to the upper end of the third connecting wire C6 and the second connecting wire C2 to allow the third connecting wire C6 and the third connecting wire C3 to pass therethrough, And a plurality of horizontal through holes (not shown) extended in the horizontal direction.

The third insulating plate 53 may be made of a synthetic resin material having electrical insulation according to the preferred embodiment.

In the installed state, the fault current limiting resistor 30 is located in the front chamber of the third insulating plate 53.

According to a preferred aspect of the present invention, the fault current detection apparatus 100 for a circuit breaker short-circuit test according to a preferred embodiment of the present invention may further include a bottom plate 80 and a plurality of first insulators 61.

The bottom plate 80 supports components of the fault current detection apparatus 100 according to the present invention.

That is, the bottom plate 80 is connected to the first bus bar 10a, the second bus bar 10b, the third bus bar 10c, the first bus bar 10a, the second bus bar 10b, The first insulating plate 51, the second insulating plate 52, and the second insulating plate 52 are formed on the upper surface of the movable body 20a, the second usable body 20b, the fault current limiting resistor 30, the resistance value selecting terminal 70, The third insulating plate 53, and the like.

The bottom plate 80 may be a metal plate such as a steel plate having a rectangular planar shape and having rigidity so that the components constituting the fault current detection device 100 can be installed and supported on the upper surface.

The first insulator 61 is provided on the bottom plate 80 to electrically insulate the first bus bar 10a, the second bus bar 10b and the third bus bar 10c from the bottom plate 80, And three first insulators 61 are provided corresponding to the first bus bar 10a, the second bus bar 10b and the third bus bar 10c.

According to a preferred aspect of the present invention, the fault current detection apparatus 100 according to the preferred embodiment of the present invention may further include a plurality of second insulators 62.

The second insulator 62 is provided under the bottom plate 80 to electrically isolate the bottom plate 80 from the ground and the second insulator 62 according to a preferred embodiment A total of four holes may be provided at four corners of the bottom plate 80 below the bottom plate 80.

The operation (action) of the fault current detection apparatus 100 for a short circuit breaker for a circuit breaker according to a preferred embodiment of the present invention constructed as described above will be described with reference to FIG. 2 to FIG.

The flow of current in the fault current detection apparatus 100 for a short circuit breaker according to a preferred embodiment of the present invention will be described first.

The current flowing through the left side of the external connection terminal 42 of the connection terminal 40 through the fourth connection cable C4 is connected to the left side of the external connection terminal 42 and the internal connection terminal 41 connected in series Through the second connection wire C2 and through the fault current limiting resistor 30. [

Next, the current passing through the fault current limiting resistor 30 flows through the first connection cable C1 to the first bus bar 10a, the first allowable body 20a, the second bus bar 10b, Body 20b, and third bus bar 10c in this order.

The current flowing from the third bus bar 10c flows through the third connection wire C3 through the right side of the internal connection terminal 41 of the connection terminal 40 to the right side of the internal connection terminal 41 And flows out to the outer side of the sample circuit breaker (not shown) through the right side of the serially connected external connection terminals 42.

On the other hand, a case where a fault current flows into the enclosure of the sample wiring breaker will be described.

The fault current flowing through the left side of the external connection terminal 42 of the connection terminal 40 through the fourth connection cable C4 is connected to the internal connection terminal 41 connected in series with the left side of the external connection terminal 42, The current flows through the fault current limiting resistor 30 via the second connection wire C2 via the left half of the fault current limiting resistor 30. At this time, the fault current limiting resistor 30 limits the fault current to the level of 1500 amperes (A) according to the embodiment.

Next, a current whose size is limited to 1500 amperes while passing through the fault current limiting resistor 30 is supplied to the first bus bar 10a, the first allowable body 20a, the second bus bar 10a, The current flows through the current path in this order of the first enabling element 10b and the second enabling element 20b. At this time, the rated current of the first enabling element 20a and the second enabling element 20b is 10% The first soluble body 20a and the second soluble body 20b melt at the same time and are broken.

Accordingly, it is possible to recognize that a fault current is short-circuited in the enclosure of the circuit breaker under short-circuit test through the fusing of the first permissible unit 20a and the second usable unit 20b.

In the fault current detection device for a short circuit breaker test according to the present invention, since the number of solenoids is two, the length of the solenoid that melts and breaks compared with the prior art using one solenoid is doubled, and the insulation distance can be increased.

The fault current detection device for a short circuit breaker for a wiring breaker according to the present invention has a plurality of output connection stages provided for each length of a resistance whose resistance value varies according to the length of the resistance, Therefore, it is possible to select the fault current limiting resistor through the resistance value selection terminal. By selecting the common input terminal and the output terminal for each resistance value when the variable selection is selected, it is possible to easily select the fault current limiting resistor It is possible to provide a changeable effect.

The fault current detection device for a circuit breaker short-circuiting test according to the present invention may further comprise a resistance value selection switch which can be selectively connected to any one of a plurality of output terminals of the resistance value selection terminal according to another embodiment, And a control unit for outputting a control signal indicating a connection position to the resistance value selection switch. The present invention can provide an effect of automatically selecting a resistance value.

1: Voltage measuring device 2: Voltage sensor
3: Voltage sensor 4: Sample (circuit breaker for test subject)
5: load 6: current transformer
10a: first bus bar 10b: second bus bar
10c: third bus bar 20a: first usable body
20b: second usable body 30: fault current limiting resistor
40: connection terminal 41: internal connection terminal
42: external connection terminal 51: first insulating plate
52: second insulating plate 53: third insulating plate
61: 1st insider 62: 2nd insulator
70: Resistance value selection terminal
71, 71a: common terminal 72, 72a: output terminal 100: fault current detection device

Claims (9)

A circuit breaker for a wiring breaker,
A plurality of bus bars and a usable body;
A fault current limiting resistor having a plurality of output connecting terminals for limiting the fault current and varying the resistance value; And
A common terminal connected to an input connection terminal of the fault current limiting resistor and a plurality of output terminals connected to a plurality of output connection terminals, And a resistance value selection terminal for providing a means for selecting the fault current detection terminal. The method according to claim 1,
Wherein the plurality of bus bars
A first bus bar formed of an electrical conductor and providing a current path for a fault current of the circuit breaker;
A third bus bar formed of an electrical conductor and providing a current path for a fault current of the wiring breaker; And
And a second bus bar formed of an electrical conductor and installed between the first bus bar and the third bus bar,
In the above-described solvable body,
A first usable body electrically connected between the first bus bar and the second bus bar and melted and broken when a fault current of the wiring breaker flows; And
And a second usable body that is electrically connected between the second busbar and the third busbar and is melted and broken when a fault current of the wiring breaker flows. The method according to claim 1,
Further comprising a connection terminal having an internal connection terminal connected to the fault current limiting resistor and the third bus bar, and an external connection terminal connected to the wiring breaker. The method according to claim 1,
And a first insulation plate provided between the resistance value selection terminal and the connection terminal and the fault current limiting resistor to electrically isolate the fault current limiting resistor from the resistance value selection terminal and the connection terminal. Fault current detection device for short circuit test. 3. The method of claim 2,
In order to electrically insulate the fault current limiting resistor from the first bus bar, the second bus bar, the third bus bar, the first usable body and the second usable body, the first bus bar, the second bus bar, Further comprising a second insulation plate disposed between the fault current conduction path including the bar, the first usable body, and the second usable body and the fault current limiting resistor. 6. The method of claim 5,
Further comprising a third insulating plate disposed at a position spaced apart from the fault current limiting resistor by a predetermined distance to insulate the fault current limiting resistor from the rear side of the circuit breaker. The method according to claim 1,
A bottom plate for supporting the components constituting the fault current detection device;
Further comprising a plurality of first insulators installed on the bottom plate to electrically isolate the first, second and third busbars from the bottom plate, respectively, Current detection device. 8. The method of claim 7,
Further comprising a plurality of second insulators installed on a lower portion of the bottom plate to electrically insulate the bottom plate from the ground. The method according to claim 1,
A resistance value selection switch which can be selectively connected to any one of a plurality of output terminals of the resistance value selection terminal; And
And a control unit for outputting a control signal indicating a selected connection position to the resistance value selection switch according to a preset resistance value.
KR1020160013085A 2016-02-02 2016-02-02 Fault current detecting apparatus for electric shortage testing of molded case circuit breaker KR20170092052A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160013085A KR20170092052A (en) 2016-02-02 2016-02-02 Fault current detecting apparatus for electric shortage testing of molded case circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160013085A KR20170092052A (en) 2016-02-02 2016-02-02 Fault current detecting apparatus for electric shortage testing of molded case circuit breaker

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Publication Number Publication Date
KR20170092052A true KR20170092052A (en) 2017-08-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107843834A (en) * 2017-11-06 2018-03-27 国网福建省电力有限公司 Integrate the electric convergence control cabinet of circuit-breaker testing debugging function
CN108983087A (en) * 2018-09-11 2018-12-11 江苏瑞峰自动化系统有限公司 A kind of breaker of plastic casing automated detection system
CN109669102A (en) * 2018-12-30 2019-04-23 浙江零跑科技有限公司 A kind of bonding aluminium wire blowout current experimental rig

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107843834A (en) * 2017-11-06 2018-03-27 国网福建省电力有限公司 Integrate the electric convergence control cabinet of circuit-breaker testing debugging function
CN107843834B (en) * 2017-11-06 2020-02-14 国网福建省电力有限公司 Electric control cabinet integrating breaker test debugging function
CN108983087A (en) * 2018-09-11 2018-12-11 江苏瑞峰自动化系统有限公司 A kind of breaker of plastic casing automated detection system
CN108983087B (en) * 2018-09-11 2024-03-15 江苏瑞峰自动化系统有限公司 Automatic detection system of molded case circuit breaker
CN109669102A (en) * 2018-12-30 2019-04-23 浙江零跑科技有限公司 A kind of bonding aluminium wire blowout current experimental rig

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