Affiliation:
1. Kawasan Institusi Baru
Abstract
Metal oxide surge arrestors (MOSA) are commonly used in the electrical power system to protect the insulation from the damaging effect of lightning. This paper presents the damage characteristics and possible root cause of two exploded ZnO type arrestors. Both failures were not caused by lightning surge. They had degraded due to moisture ingress, leading to contamination and corrosion, accelerating thermal runaway effect in the ZnO elements and eventually caused early voltage breakdown under normal operating voltage. This indicated an inadequacy in the sealing components.
Publisher
Trans Tech Publications, Ltd.
Reference5 articles.
1. E. Kazuo: Matsushita Electric Industrial Co., Ltd. IEEE Electrical Insulation Magazine Vol. 5(2) (1989) p.12.
2. K. Feser, W. Kohler, D. Q I U and K. Chrzan: IEEE Transactions on Power Delivery Vol. 3(2)(1990) p.138.
3. V. Chaudhry and R. S. Gorur, M. Dyer and R. S. Thallam: IEEE Transactions on Power Delivery Vol. 6(2) (1991) p.76.
4. J.C. Montenegro and J.L. Ramirez: Degradation of Zinc Oxide Varistors. 0-7803-2672-51 951 0 1995 L E.
5. T. Tada, J. Miyake and S. Shirakawa : A Diagnosis of Remaining Life Characteristics of ZnO Type Surge Arresters (1st Stage) For 275kv Power Systems. -7803-7525-4/02/2002 IEEE.