KR20170076984A - Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules - Google Patents

Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules Download PDF

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Publication number
KR20170076984A
KR20170076984A KR1020150186893A KR20150186893A KR20170076984A KR 20170076984 A KR20170076984 A KR 20170076984A KR 1020150186893 A KR1020150186893 A KR 1020150186893A KR 20150186893 A KR20150186893 A KR 20150186893A KR 20170076984 A KR20170076984 A KR 20170076984A
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KR
South Korea
Prior art keywords
relay
contact
breaker
earth leakage
circuit
Prior art date
Application number
KR1020150186893A
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Korean (ko)
Inventor
정영재
전상규
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정영재
전상규
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Priority to KR1020150186893A priority Critical patent/KR20170076984A/en
Publication of KR20170076984A publication Critical patent/KR20170076984A/en

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    • 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
    • G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
    • G01R31/3333—Apparatus, systems or circuits therefor
    • G01R31/3336—Synthetic testing, i.e. with separate current and voltage generators simulating distance fault conditions
    • G01R31/025—
    • 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
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • 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
    • H02H3/16—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 fault current to earth, frame or mass

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Breakers (AREA)

Abstract

It provides a circuit breaker inspection module that can be installed on the earth leakage breaker and can check the function without shutting off the main power. The control unit 10 connects the bypass circuit 20 for short-circuiting the power line when the first switch 11 is pressed to operate the circuit breaker 30. And a bypass circuit 20 to which an operating electric power supply path is connected when the first switch 11 of the control unit 10 is pressed. The present invention has an effect that the circuit breaker can be inspected by uninterrupted power without replacing the circuit breaker (30).

Description

(Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules)

The present invention relates to a leakage checking function checking method using an earth leakage breaker auxiliary module and an auxiliary module capable of performing a function check without interrupting a main power source for supplying electric power to a load device.

 As is well known, the earth leakage breaker is a device that protects the load device, line, and human body by detecting the leakage current generated from the load device or line according to the rules related to the industrial safety standard, thereby shutting off the main power source.

 These earth leakage circuit breakers are designed to prevent earth leakage breakers (ELCB) used to prevent electric shocks and fires caused by leakage currents and excessive use of excessive currents or loads (devices, machines) (NFB, No Fuse Breaker), which is used for the purpose of blocking excessive flow of current caused by the breaker.

 When the ground fault current is generated by the leakage current on the load side, the ELCB detects and amplifies a ground current in a ZCT (Zero Phase Current Transformer), then cuts off the main power on the circuit, It is an operation type circuit breaker.

 This type of circuit breaker should be inspected at least once a month to check whether the circuit breaker is operating normally.

A general configuration of a conventional earth leakage breaker is shown in Fig.

 Referring to FIG. 1, a conventional earth leakage breaker includes a main power interrupter 1 for interrupting the power of the main power lines L1 and L2, a video current transformer 2 for sensing a leakage current in the main power lines L1 and L2 A leakage current detector 3 for comparing the leakage current with an established reference level that is a criterion for determining leakage current when the leakage current is sensed from the image deflector 2 and outputting an electrical signal as to whether leakage current is generated; A trip coil control part 4 for outputting a control signal of the earth leakage breaker in accordance with a leakage current detection signal outputted from the detection part 3, a leakage current detection part 4 connected to the main power lines L1 and L2, A trip coil 5 for turning off the power supplied to the load by operating the main power interruption unit 1 in response to the generation of an electrical signal in response to the occurrence of an electrical leak, Inside of And a test button 6 for confirming that the configuration is operating smoothly.

 When the leakage current is generated in the main power lines L1 and L2 and the displacement difference is generated, the leakage current breaker detects the leakage current in the image current transformer 2 and is transmitted to the leakage current detection unit 3. The leakage current detection unit 3 And outputs an electrical signal to the trip coil control unit 4. When the signal input to the trip coil control unit 4 is a signal from the thyristor control unit 4, (SCR), the anode and the cathode are electrically connected to each other and a large amount of current flows through the trip coil 5 to generate an electromotive force. By this electromotive force, the switch of the main power interrupter 1 is operated, do.

 When a leakage current is generated in the main power lines L1 and L2 by pressing the test button 6 in order to check the normal operation of the earth leakage breaker and the normal current leakage occurs by detecting the leakage current in the main transformer 2 The main power lines L1 and L2 are cut off.

 That is, if the main power lines L1 and L2 are cut off by pressing the test button 6, the function check will be performed to confirm that the earth leakage breaker is normally operating.

 However, in the conventional structure, all the load devices connected to the main power sources L1 and L2 are cut off when the function is checked. In order to prevent this, according to the prior art reference 1, even when the test button is operated, the trip coil generates a small amount of current which does not generate an electromotive force capable of operating the main power interrupter, thereby preventing the main power from interrupting, The function of checking the function of the earth leakage breaker and checking the function of the earth leakage breaker without checking the main power is provided.

 However, in the prior art document 1, the circuit of the circuit breaker has to be replaced with the circuit shown in FIG. 2 in order to check without interrupting the main power.

Korean Patent Registration No. 0990860 (registered on October 25, 2010)

The present invention provides a leakage checking function method and an earth leakage breaker auxiliary module using an auxiliary module that can detect an abnormality of the electric leakage blocking function without interrupting the main power source when the auxiliary module is connected to the existing circuit breaker without replacing the circuit breaker circuit It has its purpose.

According to the present invention,

And a bypass circuit connected to the electric power supply path by pressing the first switch of the control unit, and a bypass circuit connected to the bypass circuit, It is an auxiliary module.

And ii) the control unit is configured such that the first switch and the first relay are connected in series, the second relay and the first a contacts of the first relay are connected in series, and the second relay and the first relay of the first relay are connected in series, and a first a contact of a second relay is connected between the contacts of the first relay and the second contact of the second relay, and the bypass of the bypass is connected to a second a contact of the second relay and a third a contact of the second relay, Is an auxiliary module of the earth leakage breaker.

Iii) the controller includes a controller for operating a first b contact of a controller connected in series to the second relay if the voltage change is greater than a reference value by measuring a change in voltage at the first resistor, Is an auxiliary module of an earth leakage breaker in which a second resistor is connected in series to the second a contact of the relay and a third resistor is connected in series to the third a contact of the second relay.

Iv) when the first switch is pressed, the power line is short-circuited to operate the breaker, the first relay operates and the second relay operates by the first a-contact of the first relay, 1 a contact is operated to self-maintain the second relay, the second a contact of the second relay and the third a contact of the second relay are operated to conduct the bypass, A method of checking the leakage function using the auxiliary module which can confirm whether there is an abnormality

If the resistance of the first resistor is greater than a reference value, the first b contact of the controller connected in series to the second relay is operated to increase the resistance of the first resistor, 2 relay, and the second a contact of the second relay and the third a contact of the second relay are returned to close the bypass, thereby returning the circuit breaker to the original state.

Thus, according to the leakage checking circuit breaker inspection module of the present invention, an auxiliary module is connected to a conventional circuit breaker to check for a short circuit by checking a short circuit, and there is no need to replace a circuit of a conventional circuit breaker .

1 is an internal circuit diagram of a conventional earth leakage breaker.
2 is an internal circuit diagram of an earth leakage breaker which can be checked for a short circuit without a conventional main power source interruption.
3 is an internal circuit diagram of an earth leakage breaker according to an embodiment of the present invention.
FIG. 4 is a circuit diagram showing an equivalent circuit of the auxiliary circuit of the present invention,

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

 The auxiliary module 100 of the earth leakage breaker to which the present invention is applied is connected to an input terminal 31 and an output terminal 32 of the circuit breaker 30 and includes a control unit 10 and a bypass circuit 20 for bypassing the power of the main power lines L1 and L2.

 The control unit 10 has a first switch 11, and when the first switch 11 is pressed, a short-circuit current is generated, and the breaker detects this and operates to turn off the breaker lever 33.

 At the same time, the first relay 12 connected in series is energized, and the first a contact 14 of the first relay is operated to energize the second relay 13. At this time, even if the first switch 11 is disconnected by the first a contact 15 of the second relay between the first a contact 14 and the second relay 13 of the first relay, the second relay 13 ) Is self-sustaining. The second relay 13 is energized and the second a contact 21 and the third a contact 22 of the second relay of the bypass circuit 20 are operated and the bypass circuit is turned on.

 Therefore, the circuit breaker can be inspected without interrupting the main power source by being coupled to the circuit breaker 30, which is a feature of the present invention.

 The controller 16 of the control unit 10 measures the voltage of the first resistor 17 and determines that the breaker lever 33 has returned when the voltage of the first resistor 17 is equal to or higher than the preset value, The second relay 13 is operated.

 The value of the voltage of the first resistor 17 changes when the breaker lever 33 is connected or disconnected. 4 (b), when the circuit breaker lever 33 is connected, the voltage of the main power line L1 and L2 is applied to the first resistor 17. However, in FIG. 4 (a) The voltage of the main power lines L1 and L2 is distributed to the first resistor 17 together with the second resistor 23 and the third resistor 24. [

 The second relay 13 is disengaged and the second a contact 21 and the third a contact 22 of the second relay return and the bypass circuit is closed.

 Therefore, by simply raising the breaker lever 33 after checking the circuit breaker, the bypass circuit 20 can be closed and the circuit breaker 30 can be returned.

 The process of checking the electric leakage function through the first switch 11 of the control unit 10 and the breaker lever 33 of the breaker 30 will be described in detail as follows.

 The present invention performs the function check by coupling the auxiliary module 100 including the control unit 10 and the bypass circuit 20 to the input terminal and the output terminal of the circuit breaker 30 and pressing the first switch 11.

 At this time, when the first switch 11 is pushed, a short-circuit current is generated and the breaker detects this and operates to turn off the breaker lever 33. [ The first relay 12 and the second relay 13 are excited to operate the second a contact 21 and the third a contact 22 of the second relay of the bypass circuit 20, do.

 The controller 16 of the control unit 10 measures the voltage of the first resistor 17 so that the voltage of the first resistor 17 is set It is determined that the breaker lever 33 has returned and the first b contact 18 of the controller is operated to disengage the second relay 13. [

 The second relay 13 is disengaged and the second a contact 21 and the third a contact 22 of the second relay return and the bypass circuit is closed.

Thus, uninterruptible checking of the circuit breaker is possible by coupling the auxiliary module 100 to the circuit breaker 30 and pressing the first switch 11 or raising the breaker lever 31.

The present invention is expected to improve the convenience of the inspection and the inconvenience caused by the power failure because the uninterruptible power supply can be checked by connecting the auxiliary module to the circuit breaker without replacing the circuit breaker.

10: control unit 11: first switch 12: first relay
13: second relay 14: first a contact of the first relay
15: first a contact of the second relay 16:
17: first resistor 18: first b contact of the controller
20: bypass circuit 21: second a contact of the second relay
22: third a contact of the second relay 23: second resistance
24: third resistor 30: breaker 31: input terminal
32: Output terminal 33: Lever
100: Earth leakage breaker auxiliary module

Claims (5)

A controller for short-circuiting the power line when the first switch is pressed to operate the breaker and connect the bypass line;
A bypass which operates when the first switch of the control unit is pressed to connect the electric supply path;
And an auxiliary module of an earth leakage breaker The apparatus of claim 1,
The first switch and the first relay are connected in series,
The second relay and the first a contacts of the first relay are connected in series,
A first a contact of a second relay is connected between the second relay and a first a contact of the first relay,
In the detour,
And a connection part of the electric supply path is constituted by a second a contact of the second relay and a third a contact of the second relay. The apparatus of claim 2,
And a controller for operating a first b contact of the controller connected in series to the second relay if the voltage change is greater than a reference value by measuring a voltage change at the first resistor,
In the detour,
An auxiliary module of an earth leakage breaker in which a second resistor is connected in series to the second a contact of the second relay and a third resistor is connected in series to the third a contact of the second relay When the first switch is pressed, the power line is short-circuited to operate the breaker, and the first relay operates so that the second relay operates by the first a contact of the first relay, and the first relay The contact is operated to self-maintain the second relay, and the second a contact of the second relay and the third a contact of the second relay are operated to conduct the bypass circuit so that the power is not cut off, A method of checking a leakage function using an auxiliary module The controller of claim 4, wherein when the lever of the circuit breaker is raised, the controller measures a change in voltage of the first resistor, and if the resistance of the first resistor is greater than a reference value, And a second a-contact of the second relay and a third a-contact of the second relay are returned to close the bypass, thereby returning the breaker to the original state.

KR1020150186893A 2015-12-25 2015-12-25 Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules KR20170076984A (en)

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KR1020150186893A KR20170076984A (en) 2015-12-25 2015-12-25 Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules

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Application Number Priority Date Filing Date Title
KR1020150186893A KR20170076984A (en) 2015-12-25 2015-12-25 Earth leakage breaker assistant module and electric leakage cut-off function check method by using earth leakage modules

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KR20170076984A true KR20170076984A (en) 2017-07-05

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113219352A (en) * 2021-01-27 2021-08-06 西安新艾电气技术有限公司 Online detection system and method for impedance spectrum of battery string
KR20210128957A (en) * 2019-11-05 2021-10-27 한국 전기안전공사 Self-diagnosis type earth leakage breaker with ICT fusion and its using method
KR20230139098A (en) * 2022-03-25 2023-10-05 삼현씨앤에스 주식회사 Surge protect device with auto recovery means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210128957A (en) * 2019-11-05 2021-10-27 한국 전기안전공사 Self-diagnosis type earth leakage breaker with ICT fusion and its using method
CN113219352A (en) * 2021-01-27 2021-08-06 西安新艾电气技术有限公司 Online detection system and method for impedance spectrum of battery string
CN113219352B (en) * 2021-01-27 2024-03-29 西安新艾电气技术有限公司 Impedance spectrum on-line detection system and method for battery strings
KR20230139098A (en) * 2022-03-25 2023-10-05 삼현씨앤에스 주식회사 Surge protect device with auto recovery means

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