Improvement of Leakage Trip Operation Time through Electronic Circuits Analysis of the Circuit-Breakers for Human Body Protection Against Electric Shock

Kim, Ju-Chul; Seo, Moon-Soo; Jang, Dong-Suk; Cho, Sook-Hyun; Han, Yoon-Tak; Lee, Sang-Joong

doi:10.5207/jieie.2016.30.8.060

Cited by 1 publication

(5 citation statements)

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“…Under 30 mA of rated sensitivity current, the maximum TOTs of existing electronic type ELCB showed 27 ms [3,25,26,27,28,29,30]. The shortest TOT for electronic type ELCB is 15 ms or longer in general despite increase of leakage current.…”

Section: Full-wave Detection Of Leakage Current 21 Tot Of Existing Ementioning

confidence: 99%

“…Electromagnetic compatibility (EMC) -Part 4-6: Testing and measurement techniques -Immunity to conducted disturbances, induced by radio-frequency fields IEICE Electronics Express, Vol. 16,No.19,[1][2][3][4][5]…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…With increase of power consumption according to economic growth, importance of electrical safety and the role of ELCB are becoming a major concern. As buildings are becoming larger, not only increased use of electricity but also increased number of the electric branch circuits is threatening the electrical safety [1,2,3]. A recent analysis shows that electric shock accidents are more common at low voltage rather than at high voltage and the number of deaths has also been on the rise.…”

Section: Introductionmentioning

confidence: 99%

“…ELCB is also called "Circuit-breaker incorporating residual current protection" in IEC60947-2 or a "Residual current operated circuitbreakers with integral over current protection for household and similar uses (RCBO)" in IEC61009-1. It is also re-ferred to as a "Ground-fault circuit-interrupter (GFCI)" in UL943 [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…To protect human body from electric shock, minimizing the leakage trip operating time (TOT from now on) of ELCB is very important [1,3]. TOT of ELCB is defined by the time elapsed from the instant leakage accident occurs until the time ELCB completely turns off the power source.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of trip operating time of electronic type ELCB to 9 mili-seconds for safety improvement of electrical facility

Kim

Lee

2019

IEICE Electron. Express

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ELCB (Earth leakage circuit-breaker) is a circuit breaker used in a low-voltage AC (Alternating Current) electrical circuit to provide electric shock protection and to prevent fires from current leakages. Trip operating time of ELCB depends on the magnitude of leakage current and the duration time of leakage accident. In this paper, the circuit and electrical signal after ZCT (Zero-sequence Current Transformer) output terminal of existing ELCBs are analyzed. As a result of measurement, electronic trip type ELCBs in present market have shown up to 27 ms of self-trip operating time under 30 mA of leakage current. This 27 ms of time delay is due to the problem that the IC in electronic circuit detects only the reverse-half cycle of sinusoidal leakage current. In this paper, the authors design a new electronic circuit that minimizes the delay factors of existing circuits. And as a result of an experiment, the trip operating time could be shortened within 9 ms. Shortened trip operating time implies reduction of shock duration of leakage current. Since the electric shock to human body and the outbreak possibility of fire are inversely proportional to square root of shock duration, faster trip operation of ELCB proposed in this paper will contribute to providing shock protection to human body and preventing fires from current leakages.

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Section: Full-wave Detection Of Leakage Current 21 Tot Of Existing Ementioning

confidence: 99%