목차

Abstract ⅰ
Table List ⅱ
Figure List ⅲ
Nomenclatue iv
1. Introduction 1
1.1 Background 1
1.2 Electric shock cases ? Domestic 6
1.2.1 Analysis of Electric shock occurrence 6
1.2.2 Analysis of Electric shock style 6
1.2.3 Analysis of Electric shock by gender 7
1.2.4 Analysis of Electric shock by age 8
1.2.5 Analysis of Electric shock by voltage level 9
1.2.6 Analysis of Electric shock by equipments 10
1.2.7 Safety improvement for Electric shock protection 11
1.3 Electric shock cases ? Oversea 13
1.3.1 Fatal accidents by Electric shock 13
1.3.2 Protective actions for Electric shock protection 14
1.4 Contents and construction of Dissertation 15
2. Theoretical investigation 17
2.1 Theoretical background 17
2.2 Phenomenon of Human electric shock 19
2.2.1 Circuit of electric shock 19
2.2.2 Magnitude of electric shock current 20
2.3 Grouding system 23
2.3.1 TN Grouding 23
2.3.2 TT Grouding 26
2.3.3 IT Grouding 27
2.4 Countermeasures for Electric shock protection 28
2.4.1 Protection by automatic power cut-off 28
2.4.2 Cut-off by ELCB 28
3. ELCB(Earth Leaking Circuit-breaker) 30
3.1 Concept of ELCB 30
3.2 Specifications of ELCB 31
3.3 Categories, structure and rated sensitivity current of ELCB 32
3.3.1 Categories and structure 32
3.3.2 Terminologies for performance 32
3.3.3 Terminologies for electrical circuit 35
3.4 Specifications for CB instantaneous characteristic 36
3.5 Styles of Human electric shock 40
4. Experiments of Leakage current sensing circuit 41
4.1 Principle of ELCB electronic circuit for electric shock protection 41
4.2 Analysis of trip operating time for existing ELCB 43
4.3 Analysis of IC Latch Part for electronic ELCB 46
4.4 Experiment and analysis of 20㎋ Delay Capacitor(CDLY) for reduction of trip operating time 48
4.5 Electronic circuit applied to 20㎋ Delay Capacitor 50
4.6 Analysis of trip operating time for ELCB circuit with 20㎋ Delay Capacitor 51
5. Design of ELCB with full-wave detection circuit 52
5.1 Detection of half-wave and full-wave 52
5.2 ELCB circuit with two Op-Amps 56
5.3 Test by authorized institute 58
5.3.1 Proposed specification of ELCB 58
5.3.2 Test items -Ⅰ 58
5.3.3 Test items -Ⅱ 61
5.3.4 Test items -Ⅲ 63
6. Test results and Analysis 67
7. Conclusion 72
References 74
Abstract 79
Acknowledgements 81