b @ nbhofujd tijfmejoh Ú ì Æ Ð À Á Á - a ! w ` Ï 0 æ f º...
TRANSCRIPT
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대 분 류 소 분 류 용 도 예
보 안 용 감전방지 기기 금속외함의 접지
유도방지 케이블 금속 차폐층의 접지
정전기 방지 절연된 바닥의 고저항 접지
건물의 직격뢰방지 피뢰침의 접지
송전선의 뇌 방호 계통접지
유도뢰 방호 피뢰기의 접지
대지 귀로용 신호전송 신호귀로용접지
급전용 해저케이블 1조방식의 접지
전자계방사용 안테나의 접지
기준 전위의 확보 통신용 직류공급장치의 한쪽끝 접지
신호용 샤시 접지
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보안용 접지(Protective Earth)
대지귀로용 접지(Functional Earth)
기준전위용 접지(Reference Earth)
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감전방지용접지(Protection against Electric shock safety earth),
보안용 접지(Protective Earth)
금속 외함을 접지한 경우
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정전 차폐용 접지
정전유도(Electrostatic induction), 정전결합(Electrostatic coupling), 용량결합
(Capacitive coupling)
통신선의 부근에 전력선 등과 같은 고압전선(전압 V1)이 있으면, 전력선과 통신
선간의 정전용량 C에 의해 부근의 통신선도 고전압(전압 V2)으로 유도된다.
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전자 차폐용 접지
전력선 등의 유도기전력의 자속에 의한 전자유도(Magnetic induction)에 의해
통신선의 심선에는 유도기전력(Induced electromanetic force)이 발생
이때 금속시스에도 유도기전력이 발생한다.
전자 차폐의 원리
금속시스의 양단을 접지한 경우
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전자 차폐용 접지
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정전기 방지용 접지
R = 106 ~ 109[Ω]
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피뢰침용 접지
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피뢰기용 접지
[Ω] 정도의 값을 가지므로
전류 i와 접지저항 R의 곱인 Ri 만큼의 접지 전위상승(earth potential rise)분이
장치에 인가된다.
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대지귀로용 접지(functional earth)
대지귀로용 접지
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대지귀로용 접지(functional earth)
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직류급전용 접지
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안테나 접지
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기준전위용 접지( 통신용접지)
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뇌의 구분 (발생 메커니즘)
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열뢰의 발생 메커니즘
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계뢰
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직격뢰
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유도뢰
구조물 등의 직격뢰에 의한 것
-.
뇌운들 사이의 방전에 의한 것
-.
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직격뢰 전류 파고치
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직격뢰 전류 파고치의 누적빈도분포
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[kA]
정도의 뇌전류가 관측된다.
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배전선에서의 유도뢰 전류
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과전압 방호소자의 특성
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과전압 방호소자의 요구성능 조건
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산화아연 바리스터(Zinc Oxide variable resister)
[μs]
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산화아연 바리스터의 I-V 특성 예
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실리콘 서지 방호소자(SSPD : Silicon Surge Protective Device)
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실리콘 서지 방호소자의 V-I 특성
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사이리스터 소자
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기타 방호소자
내뢰변압기(Lightning resistant transformer)
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보안기의 개요
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뇌피해 대책의 기본 개념
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뇌피해 발생 메커니즘
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건축물내 뇌방호의 방법
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공통접지법
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바이패스어레스터법
바이패스어레스터법
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