KR101040361B1 - ELCB using Ring-COB IC - Google Patents

ELCB using Ring-COB IC Download PDF

Info

Publication number
KR101040361B1
KR101040361B1 KR1020050117192A KR20050117192A KR101040361B1 KR 101040361 B1 KR101040361 B1 KR 101040361B1 KR 1020050117192 A KR1020050117192 A KR 1020050117192A KR 20050117192 A KR20050117192 A KR 20050117192A KR 101040361 B1 KR101040361 B1 KR 101040361B1
Authority
KR
South Korea
Prior art keywords
cob
ring
earth leakage
breaker
present
Prior art date
Application number
KR1020050117192A
Other languages
Korean (ko)
Other versions
KR20070057571A (en
Inventor
이관희
Original Assignee
현대중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020050117192A priority Critical patent/KR101040361B1/en
Publication of KR20070057571A publication Critical patent/KR20070057571A/en
Application granted granted Critical
Publication of KR101040361B1 publication Critical patent/KR101040361B1/en

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04Means for indicating condition of the switching device
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02Protective 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26Emergency 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

Abstract

본 발명은 Ring-COB IC를 이용한 누전차단기에 관한 것으로서, 특히 COB IC, 저항, 콘덴서, 사이리스터(SCR), 영상변류기 등을 하나의 세라믹보드에 집적화한 Ring-COB IC를 누전차단기에 구성하므로서, 누전차단기를 구성하는 각종 아날로그 부품이 세라믹보드에 집적화됨에 따라 습도에 강한 특성을 갖는 누전차단기를 제공할 수 있고, 제품의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있으며, 각종 아날로그 부품을 집적화함에 따라 회로작업 공정을 단순화 하여 제품의 생산성을 향상시킬 수 있도록 한 Ring-COB IC를 이용한 누전차단기에 관한 것이다.The present invention relates to an earth leakage breaker using a ring-COB IC, and in particular, a ring-COB IC integrating a COB IC, a resistor, a capacitor, a thyristor (SCR), an image current transformer, etc. in one ceramic board, As various analog parts constituting the earth leakage breaker are integrated on the ceramic board, it is possible to provide an earth leakage breaker having strong characteristics against humidity, and to further improve the reliability of the product performance, and to integrate various analog parts The present invention relates to a ground fault circuit breaker using a Ring-COB IC that simplifies the circuit work process to improve product productivity.

Ring-COB IC, 누전차단기, Ring-COB IC, Earth Leakage Circuit Breaker,

Description

링-씨오비 아이씨를 이용한 누전차단기{ELCB using Ring-COB IC}ELCB using Ring-COB IC}

도 1 은 본 발명의 제 1 실시예를 보인 도면.1 is a view showing a first embodiment of the present invention.

도 2 는 본 발명의 제 2 실시예를 보인 도면.2 shows a second embodiment of the present invention;

도 3 은 본 발명의 제 3 실시예를 보인 도면.Figure 3 shows a third embodiment of the present invention.

도 4 는 본 발명의 제 4 실시예를 보인 도면.4 shows a fourth embodiment of the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1: Ring-COB IC, BD1: 정류부,1: Ring-COB IC, BD1: Rectifier,

L1: 트립코일, SW1: 테스트 스위치,L1: trip coil, SW1: test switch,

본 발명은 Ring-COB IC를 이용한 누전차단기에 관한 것으로서, 특히 COB IC, 저항, 콘덴서, 사이리스터(SCR), 영상변류기 등을 하나의 세라믹보드에 집적화한 Ring-COB IC를 누전차단기에 구성하므로서, 누전차단기를 구성하는 각종 아날로그 부품이 세라믹보드에 집적화됨에 따라 습도에 강한 특성을 갖는 누전차단기를 제공할 수 있고, 제품의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있으며, 각종 아날로그 부품을 집적화함에 따라 회로작업 공정을 단순화 하여 제품의 생산성을 향상 시킬 수 있도록 한 Ring-COB IC를 이용한 누전차단기에 관한 것이다.The present invention relates to an earth leakage breaker using a ring-COB IC, and in particular, a ring-COB IC integrating a COB IC, a resistor, a capacitor, a thyristor (SCR), an image current transformer, etc. in one ceramic board, As various analog parts constituting the earth leakage breaker are integrated on the ceramic board, it is possible to provide an earth leakage breaker having strong characteristics against humidity, and to further improve the reliability of the product performance, and to integrate various analog parts The present invention relates to a ground fault circuit breaker using a Ring-COB IC that can improve the productivity of products by simplifying the circuit work process.

누전차단기(ELCB-Earth Leakage Circuit Breaker)는 개폐기구, 트립장치 등을 절연물 용기내에 일체로 조립한 것이며, 통전상태의 전로를 수동 또는 전기 조작에 의해 개폐할 수 있으며, 과부하, 단로 및 누전발생시 자동적으로 전류를 차단하는 것을 말한다.ELCB-Earth Leakage Circuit Breaker is an integrated assembly of switchgear, trip device, etc. in the insulator container, and it can open and close the energized circuit by manual or electric operation, and it is automatic in case of overload, disconnection and leakage. To cut off the current.

이러한 누전차단기는 교류 600[V] 이하의 저압회로에서 누전으로 인한 감전사고 및 전기화재를 예방하기 위한 목적으로 사용된다.The earth leakage breaker is used for the purpose of preventing an electric shock accident and electric fire caused by a short circuit in a low voltage circuit of AC 600 [V] or less.

이러한 누전차단기는 인쇄회로기판, 기계적 동작을 하여 전로를 개폐하는 기구부, 차단시 발생하는 아크를 소호하는 소호부, 누전차단기의 정상동작 여부를 시험하기 위한 테스트 스위치, 누전트립 등으로 구성된다.The circuit breaker is composed of a printed circuit board, a mechanical part for opening and closing the converter by mechanical operation, an arc-extinguishing part for arcing generated when the circuit is cut off, a test switch for testing the operation of the circuit breaker for normal operation, and a short circuit trip.

상기한 인쇄회로기판에는 IC(Back Side type, COB type), 저항, 콘덴서, 사이리스터(SCR), 영상변류기(ZCT) 등이 장착된다.The printed circuit board is equipped with an IC (back side type, COB type), a resistor, a capacitor, a thyristor (SCR), a current transformer (ZCT), and the like.

그러나, 종래의 누전차단기는 구성부품, 예를들면, IC(Back Side type, COB type), 저항, 콘덴서, 사이리스터(SCR), 영상변류기(ZCT) 등이 인쇄회로기판에 배치되어 서로 연결 구성된 것이기 때문에 장마철 또는 습도가 높은 장소에 설치되었을 경우 습기에 의해 오동작을 일으키게되는 문제점이 발생하고 있었다.However, the conventional earth leakage breaker is a component, for example, IC (Back Side type, COB type), resistor, capacitor, thyristor (SCR), image current transformer (ZCT), etc. are arranged on the printed circuit board and are connected to each other Therefore, when the rainy season or when installed in a place with high humidity there was a problem that causes malfunction by moisture.

즉, 종래의 누전차단기는 인쇄회로기판에 다수의 구성부품이 노출되게 장착되기 때문에 장마철, 지하실 등과같이 습도가 높은 환경에서는 습기에 의한 합선등의 원인에 기인하여 누전차단기가 오동작하게되는 등 제품의 성능에 대한 신뢰도가 하락하게되는 문제점이 발생하고 있었다.That is, the conventional earth leakage breaker is mounted on the printed circuit board so that a large number of components are exposed so that the earth leakage breaker malfunctions due to the short circuit caused by moisture in a high humidity environment such as rainy season or basement. There was a problem that the reliability of the performance was reduced.

따라서, 상기 문제점을 해결하기 위한 본 발명은 COB IC, 저항, 콘덴서, 사이리스터(SCR), 영상변류기 등을 하나의 세라믹보드에 집적화한 Ring-COB IC를 누전차단기에 구성하므로서, 누전차단기를 구성하는 각종 아날로그 부품이 세라믹보드에 집적화됨에 따라 습도에 강한 특성을 갖는 누전차단기를 제공할 수 있고, 제품의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있으며, 각종 아날로그 부품을 집적화함에 따라 회로작업 공정을 단순화 하여 제품의 생산성을 향상시킬 수 있도록 한 Ring-COB IC를 이용한 누전차단기에 관한 것이다.Therefore, in order to solve the above problems, the present invention constitutes an earth leakage circuit breaker by configuring a ring-COB IC integrating a COB IC, a resistor, a capacitor, a thyristor (SCR), an image current transformer, etc. in one ceramic board. As various analog parts are integrated on the ceramic board, it is possible to provide an earth leakage breaker having a strong characteristic against humidity, further improve the reliability of the product performance, and simplify the circuit work process by integrating various analog parts. The present invention relates to an earth leakage breaker using a Ring-COB IC to improve product productivity.

상기 목적달성을 위한 본 발명은,According to an aspect of the present invention,

청구범위 제 1 항에 의하여,According to claim 1,

인쇄회로기판에 다수의 구성부품이 배치되고, 상기 인쇄회로기판이 몰드케이스내에 내장된 누전차단기에 있어서,In a circuit breaker having a plurality of components disposed on a printed circuit board, the printed circuit board is embedded in a mold case,

상기 인쇄회로기판에는 다수의 구성부품이 세라믹보드에 집적화된 Ring-COB IC가 장착된 것을 특징으로 한다.The printed circuit board is characterized in that the Ring-COB IC in which a plurality of components are integrated on the ceramic board is mounted.

청구범위 제 2 항에 의하여,According to claim 2,

상기 Ring-COB IC는 COB-IC, 저항, 콘덴서, 사이리스터 및 영상변류기가 세라믹보드에 집적화된 것을 특징으로 한다. The ring-COB IC is characterized in that the COB-IC, resistors, capacitors, thyristors and image current transformers are integrated on the ceramic board.

이하, 첨부된 도면 도 1 내지 도 4 를 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 4.

본 발명의 가장 큰 특징은 누전차단기에 있어서, 다수의 전자부품이 장착되는 인쇄회로기판에 다수의 구성부품이 세라믹보드에 집적화된 Ring-COB IC(1)를 장착한 것이다.The biggest feature of the present invention is that in a circuit breaker, a ring-COB IC (1) in which a plurality of components are integrated on a ceramic board is mounted on a printed circuit board on which a plurality of electronic components are mounted.

상기 Ring-COB IC(1)는 COB-IC, 저항, 콘덴서, 사이리스터 및 영상변류기가 세라믹보드에 집적화된 것이다.The ring-COB IC 1 is formed by integrating a COB-IC, a resistor, a capacitor, a thyristor, and an image converter on a ceramic board.

상기와같이 세라믹보드에 다수의 구성부품이 집적화된 Ring-COB IC(1)를 인쇄회로기판에 장착하여 누전차단기를 구성하게되면, 장마철 및 지하실과 같이 습도가 높은 환경에 누전차단기가 설치되더라도 습기에 의한 회로의 오동작을 방지할 수 있게되고, 이를통해 제품의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있게된다.As described above, when the Ring-COB IC (1) in which a plurality of components are integrated on the ceramic board is mounted on a printed circuit board to construct an earth leakage circuit breaker, even if the earth leakage circuit breaker is installed in a high humidity environment such as in rainy season and basement, It is possible to prevent the malfunction of the circuit by this, it is possible to further improve the reliability of the product performance.

도 1 은 본 발명의 제 1 실시예를 도시한 것으로서, DC 220V 용 누전차단기의 회로를 도시한 것이다.Fig. 1 shows a first embodiment of the present invention and shows a circuit of a ground fault circuit breaker for DC 220V.

제 1 실시예는 Ring-COB IC(1)가 송전라인에 연결되어 있고, 입력 사용교류전원을 정류하여 DC220V를 공급하는 브릿지 다이오드로 구성된 정류부(BD1)가 전원 입력측에 연결되어 있고, 트립코일(L1) 과 테스트 스위치(SW1)가 연결 구성되어 있다.In the first embodiment, the ring-COB IC 1 is connected to the power transmission line, the rectifying part BD1 composed of a bridge diode for rectifying the input AC power supply and supplying DC220V is connected to the power input side, and the trip coil ( L1) is connected to the test switch SW1.

도 2 는 본 발명의 제 2 실시예를 도시한 것으로서, AC 220V 용 누전차단기의 회로를 도시한 것이다.Figure 2 shows a second embodiment of the present invention and shows a circuit of an earth leakage breaker for AC 220V.

제 2 실시예는 Ring-COB IC(1)가 송전라인에 연결되어 있고, 입력교류전원이 바로 Ring-COB IC(1)에 공급되도록 구성되어 있으며, 트립코일(L1)과 테스트 스위 치(SW1)이 연결된 구성이다.In the second embodiment, the Ring-COB IC 1 is connected to the power transmission line, and the input AC power is directly supplied to the Ring-COB IC 1, and the trip coil L1 and the test switch SW1 are provided. ) Is connected.

도 3 은 본 발명의 제 3 실시예를 도시한 것으로서, GFCI용 AC 120V용 누전차단기의 회로를 도시한 것이다.Figure 3 shows a third embodiment of the present invention and shows a circuit of an earth leakage breaker for AC 120V for GFCI.

제 3 실시예는 Ring-COB IC(1)가 송전라인에 연결되어 있고, 브릿지 다이오드로 이루어진 정류부(BD1), 트립코일(L1), 테스트용 스위치(SW1) 및 CT 가 연결된구성이다.In the third embodiment, the Ring-COB IC 1 is connected to the power transmission line, and the rectifying part BD1, the trip coil L1, the test switch SW1, and the CT, each of which is a bridge diode, are connected.

도 4 는 본 발명의 제 4 실시예를 도시한 것으로서, AC 460V 용 누전차단기의 회로를 도시한 것이다.Figure 4 shows a fourth embodiment of the present invention and shows a circuit of an earth leakage breaker for AC 460V.

제 4 실시예는 Ring-COB IC(1)가 송전라인에 연결되어 있고, 브릿지 다이오드로 이루어진 정류부(BD1), 트립코일(L1), 테스트용 스위치(SW1) 등이 연결된 구성이다.In the fourth embodiment, the Ring-COB IC 1 is connected to the power transmission line, and the rectifying unit BD1, the trip coil L1, the test switch SW1, etc., each of which is a bridge diode, is connected.

상기 설명된 본 발명의 제 1 내지 제 4 실시예에는 공히 Ring-COB IC(1)가 구성되어 있으며, 상기한 Ring-COB IC(1)는 세라믹 보드에 COB-IC, 저항, 콘덴서, 사이리스터(SCR), 영상변류기(ZCT) 등이 집적된 것이어서 누전차단기가 습기가 많은 환경에 사용된다 하더라도 습기에 의한 오동작을 일으키지 않게된다.In the first to fourth embodiments of the present invention described above, the Ring-COB IC 1 is configured, and the Ring-COB IC 1 includes a COB-IC, a resistor, a capacitor, a thyristor ( SCR), ZCT, etc. are integrated, so that even if the earth leakage breaker is used in a humid environment, it does not cause a malfunction due to moisture.

이에따라 누전차단기의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있게되는 것이다.Accordingly, the reliability of the earth leakage breaker can be further improved.

이상에서 설명한 바와같이 본 발명은 COB IC, 저항, 콘덴서, 사이리스터(SCR), 영상변류기 등을 하나의 세라믹보드에 집적화한 Ring-COB IC를 누전차단기 에 구성하므로서, 누전차단기를 구성하는 각종 아날로그 부품이 세라믹보드에 집적화됨에 따라 습도에 강한 특성을 갖는 누전차단기를 제공할 수 있고, 제품의 성능에 대한 신뢰도를 한층 더 향상시킬 수 있으며, 각종 아날로그 부품을 집적화함에 따라 회로작업 공정을 단순화 하여 제품의 생산성을 향상시킬 수 있도록 한 Ring-COB IC를 이용한 누전차단기를 제공하는 효과를 기대할 수 있다.As described above, the present invention configures a ring-COB IC in which a COB IC, a resistor, a capacitor, a thyristor (SCR), a video current transformer, and the like are integrated on one ceramic board in a ground fault circuit breaker, thereby forming various analog parts that constitute a ground fault circuit breaker. The integrated circuit board can provide an earth leakage circuit breaker with strong humidity characteristics, further improve the reliability of the product performance, and simplify the circuit work process by integrating various analog components. The effect of providing an earth leakage breaker using a Ring-COB IC to improve productivity is expected.

Claims (2)

인쇄회로기판에 다수의 구성부품이 배치되고, 상기 인쇄회로기판이 몰드케이스내에 내장된 누전차단기에 있어서,In a circuit breaker having a plurality of components disposed on a printed circuit board, the printed circuit board is embedded in a mold case, 상기 인쇄회로기판에는 다수의 구성부품이 세라믹보드에 집적화된 Ring-COB IC가 장착된 것을 특징으로 하는 링-씨오비 아이씨를 이용한 누전차단기.The circuit breaker using a ring-COB IC, characterized in that the printed circuit board is equipped with a ring-COB IC integrated with a plurality of components on a ceramic board. 제 1 항에 있어서, The method of claim 1, 상기 Ring-COB IC는 COB-IC, 저항, 콘덴서, 사이리스터 및 영상변류기가 세라믹보드에 집적화된 것을 특징으로 하는 링-씨오비 아이씨를 이용한 누전차단기.The ring-COB IC is an earth leakage breaker using a ring-COB IC, characterized in that the COB-IC, resistors, capacitors, thyristors and image current transformers are integrated on the ceramic board.
KR1020050117192A 2005-12-02 2005-12-02 ELCB using Ring-COB IC KR101040361B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020050117192A KR101040361B1 (en) 2005-12-02 2005-12-02 ELCB using Ring-COB IC

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050117192A KR101040361B1 (en) 2005-12-02 2005-12-02 ELCB using Ring-COB IC

Publications (2)

Publication Number Publication Date
KR20070057571A KR20070057571A (en) 2007-06-07
KR101040361B1 true KR101040361B1 (en) 2011-06-10

Family

ID=38354887

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020050117192A KR101040361B1 (en) 2005-12-02 2005-12-02 ELCB using Ring-COB IC

Country Status (1)

Country Link
KR (1) KR101040361B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190120898A (en) * 2018-04-17 2019-10-25 주식회사 코본테크 Circuit breaker with Fiber core type ZCT device and COB-IC Integrated device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980057933U (en) * 1997-02-14 1998-10-26 유인기 Controller board of earth leakage breaker
KR20010082343A (en) * 1998-12-15 2001-08-29 클라스 노린, 쿨트 헬스트룀 An optical transmitter-receiver module
KR20040061475A (en) * 2002-12-31 2004-07-07 현대중공업 주식회사 AFCI using COB-IC
KR20040099982A (en) * 2003-05-21 2004-12-02 형제전기주식회사 Earth leakage breaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980057933U (en) * 1997-02-14 1998-10-26 유인기 Controller board of earth leakage breaker
KR200182343Y1 (en) 1997-02-14 2000-05-15 유인기 Short circuit breaker
KR20010082343A (en) * 1998-12-15 2001-08-29 클라스 노린, 쿨트 헬스트룀 An optical transmitter-receiver module
KR20040061475A (en) * 2002-12-31 2004-07-07 현대중공업 주식회사 AFCI using COB-IC
KR20040099982A (en) * 2003-05-21 2004-12-02 형제전기주식회사 Earth leakage breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190120898A (en) * 2018-04-17 2019-10-25 주식회사 코본테크 Circuit breaker with Fiber core type ZCT device and COB-IC Integrated device
KR102127004B1 (en) * 2018-04-17 2020-07-07 주식회사 코본테크 Circuit breaker with Fiber core type ZCT device and COB-IC Integrated device

Also Published As

Publication number Publication date
KR20070057571A (en) 2007-06-07

Similar Documents

Publication Publication Date Title
US7667935B2 (en) Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof
US7751161B2 (en) Leakage current detection and interruption circuit
US8659857B2 (en) Leakage current detection and interruption circuit powered by leakage current
US7623329B2 (en) Leakage current detection and interruption circuit with improved shield
US8526146B2 (en) Electrical wiring device
EP1385015B1 (en) Tester for a plurality of circuit breakers having a range of rated currents and multiple trip functions
US6232675B1 (en) Power distribution apparatus comprising relay devices for controlling current flow along power paths of the power distribution apparatus
US10498138B2 (en) Protective circuit for a current transformer and current transformer with a protection circuit
RU2481666C2 (en) Automatic fault current shutdown device
US4194231A (en) Dual voltage ground fault protector
US7362551B2 (en) Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof
CA1158300A (en) Computer-controlled switching device
US11373816B2 (en) Circuit breaker
US20150228435A1 (en) Fuse failure display
US11536777B2 (en) Intelligent leakage current detection and interruption device for power cord
KR101040361B1 (en) ELCB using Ring-COB IC
CA2360182A1 (en) Conversion of standard class a ground-fault circuit interrupters, (gfci), to a class a ground-fault circuit interrupter with open neutral protection
ITMI20002849A1 (en) LOW VOLTAGE ELECTRONIC DIFFERENTIAL SWITCH WITH IMPROVED FUNCTIONALITY
JP3925878B2 (en) Earth leakage protection plug
RU2742927C1 (en) Circuit protection device and circuit protection assembly, including circuit protection device
CN210468782U (en) Power line leakage protection device, electric connection equipment and electrical appliance
JP2636417B2 (en) Insulation breakdown detection circuit for instrument transformer and instrument transformer provided with the detection circuit
KR100596357B1 (en) Leakage Current Detection Device
JPH0422509Y2 (en)
KR870001386Y1 (en) Power circuit

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20140603

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20160527

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20180528

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20190528

Year of fee payment: 9