KR101638632B1 - Leakage current breaking apparatus - Google Patents
Leakage current breaking apparatus Download PDFInfo
- Publication number
- KR101638632B1 KR101638632B1 KR1020090090594A KR20090090594A KR101638632B1 KR 101638632 B1 KR101638632 B1 KR 101638632B1 KR 1020090090594 A KR1020090090594 A KR 1020090090594A KR 20090090594 A KR20090090594 A KR 20090090594A KR 101638632 B1 KR101638632 B1 KR 101638632B1
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- Prior art keywords
- resistor
- current
- leakage
- surge
- leakage current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
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- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Disclosed is a leakage preventing device capable of distinguishing between a surge current and a leakage current by using a duration time, operating only when a leakage current occurs, and further varying an operation time.
According to the present invention, there is provided a leakage current cut-off device including a power supply unit for supplying power to the inside of a vehicle, comprising: a zero-current transformer (ZCT) for detecting a surge current and a leakage current generated in a distribution line; A controller for outputting a signal corresponding to a voltage induced in the secondary coil of the video current transformer by the surge current or leakage current and operating the earth leakage shutoff device when an operation signal for the operation of the earth leakage shutoff device is received; And a surge protector for determining whether a surge current or a leakage current is generated according to the duration of the signal output from the controller and outputting an operation signal of the earth leakage interrupter to the controller when a leakage current is generated; The present invention provides an electric leakage preventing device comprising:
Surge current, Leakage current, Leakage current, Shutdown, Video current transformer, Resistor, Capacitor
Description
The present invention relates to a leakage preventing device, and more particularly, to a leakage preventing device that distinguishes between a surge current and a leakage current, operates only when a leakage current is generated, and can further change an operation time.
In general, a leakage current breaker is a type of leakage current breaker in which when a leakage current due to insulation deterioration of an electric device connected to a line or a line and a leakage current due to a human body contact of a load- It is a device to prevent in advance. Electrical circuits of transformers with high-voltage currents, and electrical facilities in pots with explosion hazards must be equipped with earth-leakage circuit breakers for safety reasons. Also, it is recommended to install an earth leakage circuit breaker to prevent electric shocks in electric circuits installed in places with high humidity and in places where outdoor people can easily reach.
However, it is a reality that such an earth leakage breaker is inconvenient to use due to a large number of malfunctions due to an unexpected surge current. Generally, both the surge voltage and the leakage current are larger than the preset reference voltage in the circuit. Therefore, the surge current is recognized as the leakage current in the earth leakage breaker, and the surge current often operates even when the surge current is generated. In order to prevent such a malfunction due to the surge current, a technique has been proposed in which a circuit for blocking or filtering the surge current is provided in the earth leakage breaker.
1 is a configuration diagram of a conventional earth leakage breaker.
Referring to FIG. 1, in the conventional
The
In addition, the surge current itself can be reduced by increasing the number of turns of the
SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric leakage preventing device capable of operating a electric leakage arrester only when a leakage current is generated by using a duration of a surge current and a leakage current in a distribution line .
It is another object of the present invention to make it possible to vary the operation time of the earth leakage breaker.
According to an aspect of the present invention,
(ZCT) for detecting a surge current and a leakage current generated in a power distribution line; A controller for outputting a signal corresponding to a voltage induced in the secondary coil of the video current transformer by the surge current or leakage current and operating the earth leakage shutoff device when an operation signal for the operation of the earth leakage shutoff device is received; And a surge protector for determining whether a surge current or a leakage current is generated according to the duration of the signal output from the controller and outputting an operation signal of the earth leakage interrupter to the controller when a leakage current is generated; The present invention provides an electric leakage preventing device comprising:
In one embodiment of the present invention, the surge protector receives a signal output from the control unit as a switching signal, and has a first switch connected to the power source through the first resistor (R1) (TR1); A voltage at a connection point between the first switch TR1 and the first resistor R1 is input as a switching signal through the second resistor R2 and one end is connected to the power source through the third resistor R3, A second switch TR2 connected to ground; A fourth resistor R4 and a fifth resistor R5 connected in parallel to the second switch TR2 between a connection point between the second switch TR2 and the third resistor R3 and the ground; And a capacitor (C) connected in parallel to the fifth resistor (R5) between a connection point of the fourth resistor (R4) and a fifth resistor (R5) and ground, and the capacitor (C) (R5), and outputs an operation signal to the control unit when the capacitor (C) is charged.
In this case, when the control unit outputs a signal corresponding to the induced voltage due to the leakage current, the capacitor C is preferably fully charged, and the control unit outputs a signal corresponding to the induced voltage by the surge current It is preferable that the capacitor C is not fully charged.
In an embodiment of the present invention, the control unit may further include a filtering unit for removing a noise signal included in the signal output from the control unit.
In an embodiment of the present invention, the controller compares the voltage induced in the secondary coil of the video current transformer with the predetermined reference voltage by the surge current or the leakage current, and when the induced voltage is greater than the reference voltage, It is preferable to output a voltage.
In another embodiment of the present invention, the surge protector receives a signal output from the control unit as a switching signal, and has a first end connected to the power source through the first resistor (R1) Switch TR1; A voltage at a connection point between the first switch TR1 and the first resistor R1 is input as a switching signal through the second resistor R2 and one end is connected to the power source through the third resistor R3, A second switch TR2 connected to ground; A fourth resistor R4 and a fifth resistor R5 connected in parallel to the second switch TR2 between a connection point between the second switch TR2 and the third resistor R3 and the ground; At least two capacitors (C1 to Cn) connected in parallel to the fifth resistor (R5) between the connection point of the fourth resistor (R4) and the fifth resistor (R5) and the ground; And a third switch SW for selectively connecting a connection point between the fourth resistor R4 and the fifth resistor R5 and any one of the at least two capacitors C1 through Cn. The selectively coupled capacitor charges a voltage across the fifth resistor (R5) and outputs an operation signal to the controller when the connected capacitor is charged.
Preferably, the operation time of the earth leakage protection device is adjusted by varying the output time of the operation signal by selectively connecting the two or more capacitors.
Also, it is preferable that the operation time of the earth leakage blocking device is determined by the capacitance of the fifth resistor (R5) and the selectively connected capacitor.
When the control unit outputs a signal corresponding to the induced voltage due to the leakage current, the selectively connected capacitor is preferably fully charged. Further, the control unit may control the signal corresponding to the induced voltage by the surge current When outputting, the selectively coupled capacitor is preferably not fully charged.
According to the present invention, it is possible to distinguish the leakage current from the leakage current by using the characteristic that the surge current is shorter than the leakage current in the leakage current interrupter, and by operating the leakage current interrupter only when the leakage current occurs, So that the reliability of operation can be increased in the electric leakage screening device.
In addition, according to the present invention, since the operation time of the electric leakage screening device can be varied, it is possible to broaden the use width according to a necessary situation.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
The present invention provides a short circuit breaking device. The leakage current blocking device of the present invention operates only when a leakage current is generated without generating a surge current, thereby preventing malfunction due to an unexpected surge current. As described above, in the present invention, the leakage current is distinguished from the leakage current, so that the leakage preventing device operates when a leakage current occurs. In the present invention, the distinction between the surge current and the leakage current uses the duration of the surge current and the leakage current. Further, according to the present invention, the operation time of the electric leakage screening device is varied, so that the use width of the electric leakage screener can be widened according to the situation.
2 is a graph comparing the duration of the surge current and the leakage current according to the present invention.
As shown in FIG. 2, the surge current and leakage current detected in the distribution line are larger than the reference voltage Vref, and the surge current is shorter in duration than the leakage current. That is, when the duration of the surge current is t1 and the duration of the leakage current is t2, t1 and t2 have a relationship of t1 < t2. The present invention distinguishes between the occurrence of a surge current and a leakage current by using the difference between the duration of the surge current and the leakage current and makes it possible to operate the leakage breaker only when a leakage current occurs. .
3 is a configuration diagram of an electrical leakage preventing device according to an embodiment of the present invention.
3, an earth
The ZCT 110 is a device for detecting a leakage current to a distribution line. In particular, when an accidental current such as a leakage current or a surge current is generated in the distribution line, a current is induced in the secondary coil of the
The
The
The
The
To this end, the
Referring to FIG. 3, the operation of the earth
First, when the leakage current occurs, the induced voltage due to the leakage current is output to the operational amplifier of the
On the other hand, when the surge current is generated, the induced voltage due to the surge current is output to the operational amplifier of the
Here, the voltage applied to the fifth resistor R5 can be expressed by the following equation (1), and the time to charge the capacitor C up to the voltage applied to the fifth resistor R5, that is, the time Can be controlled by the time constant (RC) shown in Equation (2).
[Equation 1]
[Equation 2]
Where Vi is the voltage across the fifth resistor, C is the capacitance of the capacitor, and R is the fifth resistor value.
4 is a configuration diagram of an electrical leakage preventing device according to another embodiment of the present invention.
4, an earth
Referring to FIG. 4, the operation of the earth
5 is a diagram illustrating signals according to surge current and leakage current generation according to an embodiment of the present invention.
5 (a) shows a signal when a surge current is generated, and Fig. 5 (b) shows a signal when a leakage current is generated. In the drawings, A, B, C, and D indicate positions in the circuit of the earth leakage breaker shown in Figs. 3 and 4.
5 (a), when the surge current is larger than the reference voltage Vref set in the operational amplifier, the operational amplifier outputs a high signal, and the A position (the first switch TR1) A high signal is shown for a time when the surge current is larger than the reference voltage Vref. At this time, when the first switch TR1 is turned on, the second switch TR2 is turned off because there is no signal at the B position (switching signal of the second switch TR2). At the C position (voltage of the fifth resistor), a voltage is applied to the fifth resistor R5, and thus a high signal is outputted. Charging starts at the D position (voltage across the capacitor). However, since the duration of the surge current is short and the surge current disappears after being charged, the battery can not be charged until Vc. As a result, since the operation signal is not output to the output terminal, the earth leakage cutoff device does not operate.
On the other hand, as shown in FIG. 5 (b), the leakage current has a longer duration than the surge current. As a result, the signal holding time at the positions A, B, C, and D is also long. Referring to the drawing, when a leakage current occurs, the leakage current appears larger than the reference voltage (Vref) set in the operational amplifier, so that the operational amplifier outputs a high signal, and at the A position (switching signal of the first switch TR1) And a high signal for a time when the surge current is greater than the reference voltage (Vref). At this time, when the first switch TR1 is turned on, the second switch TR2 is turned off because there is no signal at the B position (switching signal of the second switch TR2). At the C position (voltage of the fifth resistor), a voltage is applied to the fifth resistor R5, and thus a high signal is outputted. Charging starts at the D position (voltage across the capacitor). The leakage current is charged up to the capacity of the capacitor because of the long duration. As a result, an operation signal is output to the output terminal and the earth leakage breaker operates.
As described above, in order to prevent erroneous operation due to the surge current, the leakage current blocking device of the present invention distinguishes the surge current from the leakage current by using the characteristic that the surge current is shorter than the leakage current, The circuit breaker shall be operated only when a surge current has occurred and no leakage current has occurred. Also, the operation time of the electric leakage blocking device can be arbitrarily changed by selectively using any one of a plurality of capacitors having different capacities by changing the operation signal for operating the electric leakage screening device according to the charging time of the capacitor .
While the invention has been shown and described with reference to certain preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the appended claims, The genius will be so self-evident. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.
The earth leakage protection device shall be installed in a high-voltage distribution line. Such a leakage current interrupting device may cause a malfunction of the electric device due to the surge current. Therefore, a surge protection circuit must be provided to protect the device from surge currents.
In this respect, the leakage current blocking device according to the present invention detects the occurrence of leakage current by using the surge current and the duration of the leakage current and operates only when leakage current is generated, thereby protecting the device and preventing malfunction have. In addition, since the operation time of the electric leakage screening device can be arbitrarily adjusted, the use width can be widened.
Therefore, the earth leakage breaker according to the present invention can be very usefully used in a power system such as a distribution line.
1 is a configuration diagram of a conventional earth leakage breaker.
2 is a graph comparing the duration of the surge current and the leakage current according to the present invention.
3 is a configuration diagram of an electrical leakage preventing device according to an embodiment of the present invention.
4 is a configuration diagram of an electrical leakage preventing device according to another embodiment of the present invention.
5 is a diagram illustrating signals according to surge current and leakage current generation according to an embodiment of the present invention.
Description of the Related Art [0002]
110: Video transformer 120:
130: power supply unit 140: filter unit
150: surge protection unit 160: operation time adjustment unit
Claims (11)
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KR1020090090594A KR101638632B1 (en) | 2009-09-24 | 2009-09-24 | Leakage current breaking apparatus |
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KR1020090090594A KR101638632B1 (en) | 2009-09-24 | 2009-09-24 | Leakage current breaking apparatus |
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KR101638632B1 true KR101638632B1 (en) | 2016-07-11 |
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KR101303732B1 (en) * | 2012-06-14 | 2013-09-04 | 한국 전기안전공사 | A simulator for a low-voltage wiring system |
KR101247208B1 (en) * | 2012-08-07 | 2013-03-26 | 엠티엔시 (주) | Earth leakage breaker |
KR20150081943A (en) * | 2014-01-07 | 2015-07-15 | 엘에스산전 주식회사 | Earth leakage circuit breaker |
KR101897075B1 (en) * | 2016-11-09 | 2018-09-10 | 현대오트론 주식회사 | Noise elimination circuit |
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KR100294274B1 (en) * | 1998-03-16 | 2001-09-17 | 송용철 | Apparatus for controlling power factor |
KR100610258B1 (en) * | 2004-03-06 | 2006-08-09 | 엠티엔시 (주) | Intelligent earth leakage breaker system |
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