열화에 따른 바리스터의 고조파 및 비선형 특성에 관한 연구 = A Study of Varistor Harmonics and Nonlinear Characteristics According to Degradation

다국어 초록 (Multilingual Abstract)

This study aims to investigates the effects of degradation on the harmonics and nonlinear characteristics of Metal Oxide Varistors (MOVs), which are surge protection devices (SPDs) installed to prevent damage to electrical equipment caused by lightning-induced surges. The physical changes to MOVs under accelerated degradation and gradual voltage ramping were analyzed using Megger S1-1568 and Hipot Analyzer 19055-c. Accelerated aging tests were conducted by applying voltages at 10-hour intervals with leakage currents of 3mA, 4.5mA, and 6mA, for a total of 50 hours to simulate different degrees of degradation. As degradation progressed, both odd harmonics and even harmonics were generated. Initially, the Total Harmonic Distortion (%THD) increased due to degradation, but as the degradation intensified, %THD decreased due to the overall increase in leakage current outweighing the increase in even harmonics. Furthermore, the magnitude of the nonlinear coefficient significantly decreased with the progressing degradation, from 72.67 to 21.79 (at 3mA), 19.95 (at 4.5mA), and 2.52 (at 6mA). By continuously monitoring the physical changes, such as the generation of even harmonics and the decrease in the nonlinear coefficient, with the progressing degradation, it is possible to appropriately determine the replacement cycle of SPDs before thermal runaway occurs.

참고문헌 (Reference)

1 김주철 ; 최경래 ; 이상중, "인청동 스위칭 모듈을 이용한 전력계통 및 전자기기 내부회로의 MOV 열폭주 방지와 안전성 개선" 한국조명.전기설비학회 25 (25): 75-79, 2011

2 정태훈 ; 신희상 ; 조성민 ; 이희태 ; 이준규 ; 김재철, "안정성 개선을 위해 열폭주 방지 기능을 내장한 배리스터 설계에 관한 연구" 한국조명.전기설비학회 24 (24): 69-76, 2010

3 안창환, "누설전류 신호를 이용한 서지보호기 열화진단 방법 연구" 대한전자공학회 58 (58): 89-94, 2021

4 김주철 ; 전주술 ; 기채옥 ; 최경래 ; 이상중, "내장 순시 트립장치를 이용한 MOV의 열폭주 보호와 SPD의 안전성 개선" 한국조명.전기설비학회 25 (25): 120-125, 2011

5 박춘배 ; 유인성 ; 정종협, "ZnO 나노파우더 바리스터의 제작과 전기적 특성" 한국전기전자재료학회 18 (18): 1117-1123, 2005

6 Yeong-Hoo Jang, "Surge Protection Technology Capable of Predicting a Life Cycle of MOVs" 188-189, 2012

7 Ki-Uk Kim, "Reduction of Harmonic in Semiconductor Process with Load Balancing" Ajou University 2020

8 International Electrotechnical Commission, "Protection Against Lightning-Part 3 : Physical Damage to Structures and Hazard IEC 62305-3"

9 International Electrotechnical Commission, "Protection Against Lightning-Part 1 : General Principles IEC 62305-1"

10 International Electrotechnical Commission, "Methods for product accelerated testing IEC 62506"

11 A. Min, "Investigation on the Physical Properties of Varistors According to Temperature" 10 : 115758-115766, 2022

12 Dae-Ha Kang, "Estimation of Nonlinear Coefficients for ZnO varistor and Dielectric Properties" 1242-1243, 2008

13 Son Chang Gil, "Electrical Properties and Microstructure of ZnO Varistor with high surge protective characteristics" 111-114, 2017

14 Bok-Hee Lee, "Detection Method of Resistive Leakage Current Flowing through ZnO Arrester Blocks" 15 (15): 67-73, 2001

15 Youn-Woo Hong, "Characteristics and Application of ZnO Baristor" 29 (29): 12-21, 2016

16 Jong-Hyuk Lee, "Changes of Electrical Characteristics of Low-voltage ZnO Varistors by a lightning Impulse Current" 4 (4): 793-801, 2000

17 Han-Kyu Lee, "Accelerated Life Test for ZnO Varistor" 13-18, 2006

18 Seong-Cheol Hwang, "A Study on the Deterioration of ZnO Varistors by the Application of a Surge Current" Korea Maritime & Ocean University 2018