A Monitoring Device of Leakage Currents Flowing through ZnO Surge Arresters

Lee, Bok-Hee; Kang, Sung-Man; Eom, Ju-Hong; Kawamura, Tatsuo

doi:10.1143/jjap.42.1568

Cited by 15 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Resistive components are due to pollution of ZnO elements. The resistive current will increase with time, ambient temperature and applied voltage [13,14]. Thus, it is very important to monitor the leakage current behaviour in order to reduce the degradation of ZnO surge arresters.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Modelling of Leakage Current Behaviour in ZnO Surge Arresters under Various Applied Voltage Amplitudes and Pollution Conditions

et al. 2018

View full text Add to dashboard Cite

In zinc oxide (ZnO) surge arresters, leakage current usually flows across the arrester under normal operating condition. Leakage current is one of the factors which contribute towards degradation of surge arresters and therefore, it is very important to monitor the condition of surge arrester. In this work, the behaviour of leakage current in a ZnO surge arrester during normal operation, under different voltage amplitudes, wetness and pollution conditions was analysed. An 11 kV surge arrester model in three-dimensional space was subjected to finite element analysis (FEA) to determine the leakage current under different conditions. The results from the FEA model were compared with the measurement results to validate the model that has been developed. From comparison between the measurement and simulation results, physical parameters of a surge arrester that influence the leakage current under different conditions of the surge arrester were identified from the model. Through this work, a better understanding of leakage current behaviour can be attained, which may help in condition monitoring analysis on surge arrester in electrical utilities.

show abstract

Section: Introductionmentioning

confidence: 99%

Measurement and Modelling of Leakage Current Behaviour in ZnO Surge Arresters under Various Applied Voltage Amplitudes and Pollution Conditions

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Varistor voltage and energy capacity are also important electrical properties of the ZnO varistor. 1) These properties are depending on the microstructures of ZnO varistor.…”

Section: Introductionmentioning

confidence: 99%

The correlation between surge energy capability and Bi<sub>2</sub>O<sub>3</sub> volatilization in ZnO varistors

Choi

Jung

Kang

2018

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

This study investigated the correlation between the surge energy capability and Bi 2 O 3 volatilization in ZnO varistors by analyzing the volatilization phenomenon of Bi 2 O 3. A ZnO varistor is composed mainly of Sb 2 O 3 , Bi 2 O 3. Bi 2 O 3 has the lowest vapor pressure among these components. Bi 2 O 3 play an important role, moreover, in forming it grain boundaries. These grain boundaries have low conductivity in the leakage current region, but, becomes higher in the region. It also determines the surge energy capability of the varistors. Bismuth oxide has four phases, each with intrinsic ion-conductivity. Formation of the bismuth oxide phase depends on the amount of bismuth at the grain boundary. Volatilization of Bi 2 O 3 should therefore be prevented when developing ZnO varistors was conducted using with high energy capabilities. Analysis of the volatilization phenomenon of Bi 2 O 3 X-ray analysis methods such as X-ray fluorescence, X-ray photoelectron spectroscopy and X-ray diffraction. The results confirmed a close correlation among them. Sealed sintering methods were proposed to prevent the volatilization of Bi 2 O 3 by ZnO varistors.

show abstract

“…O método indicado para isto é o da FFT (Fast Fourier Transform, sigla em inglês para Transformada Rápida de Fourier), método computacional mais eficiente e rápido para a obtenção do sinal do domínio do tempo em domínio da frequência. norma IEC 60099-5[4] e Lee et al[41] indicam que, tanto a corrente resistiva quanto a 3 a H são dependentes da temperatura do elemento de ZnO, conforme mostra a Figura 3.15. Figura 3.17 verificamos que, conforme aumentamos a tensão aplicada ao bloco, o valor da corrente resistiva aumenta, aumentando também a 3 a H da corrente total.…”

unclassified

Contribuição à metodologia de avaliação dos pára-raios do sistema de transmissão de energia elétrica

Zanotti¹

View full text Add to dashboard Cite

Agradeço a Deus a permissão de estar vivo, e poder fazer este trabalho. Agradeço também aos meus antepassados, que acredito estarem sempre comigo. À ISA-CTEEP, na pessoa do Eng. Wilson Roberto Bacega, que propiciou a realização das investigações de laboratório e de campo nos pára-raios da concessionária. Ao meu amigo e orientador, Prof. Dr. Arnaldo G. Kanashiro, pelas incontáveis horas gastas comigo e com este trabalho, pela paciência e orientações valiosas. Não posso de deixar agradecer também os Profs. Drs. Alexandre Piantini e Hédio Tatizawa, que apesar de não serem meus orientadores, sempre encorajaram-me e aconselharam em momentos importantes. Aos meus amigos do PIPGE, turma de 2006, e aos meus amigos do IEE, em especial ao Dr.

show abstract

A Monitoring Device of Leakage Currents Flowing through ZnO Surge Arresters

Cited by 15 publications

References 6 publications

Measurement and Modelling of Leakage Current Behaviour in ZnO Surge Arresters under Various Applied Voltage Amplitudes and Pollution Conditions

Measurement and Modelling of Leakage Current Behaviour in ZnO Surge Arresters under Various Applied Voltage Amplitudes and Pollution Conditions

The correlation between surge energy capability and Bi<sub>2</sub>O<sub>3</sub> volatilization in ZnO varistors

Contribuição à metodologia de avaliação dos pára-raios do sistema de transmissão de energia elétrica

Contact Info

Product

Resources

About