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The Degradation of ZnO Varistors Packed with Epoxy Insulation Layers

The Degradation of ZnO Varistors Packed with Epoxy Insulation Layers
The Degradation of ZnO Varistors Packed with Epoxy Insulation Layers
Zinc oxide (ZnO) varistor is a highly non-linear semiconducting device that is widely used as a transient voltage surge protector in electrical and electronic systems. One of the major challenges in the continuous development of varistors has been to reduce the long-term degradation. The degradation can take a number of forms when the varistor is subjected to a series of pulses or to a constant applied dc or ac voltage. There will be a distinct asymmetry in the I-V characteristics once the degradation has taken place, with the leakage current being greater in both directions of the applied field. Because varistors are usually operated under the voltage, any increase in leakage current is of major importance. This is especially so for the station-class varistors that are used in power distribution systems, because the power dissipated within the varistor represents a loss in distributable power. Under extreme conditions, particularly at elevated temperatures, the increase in leakage current can be sufficient for the associated Joule heating to cause thermal runaway of the varistor.
ZnO varistor, Epoxy insulation, degradation
7-900371-56-7
137-140
Li, J
e0ade5f8-f879-43ff-81bc-0661aadccee1
Li, S
913ba08e-bff5-48fc-9604-872010707dbb
Alim, M. A.
a33f710d-0da2-4a04-810a-5b3564ee9c53
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, J
e0ade5f8-f879-43ff-81bc-0661aadccee1
Li, S
913ba08e-bff5-48fc-9604-872010707dbb
Alim, M. A.
a33f710d-0da2-4a04-810a-5b3564ee9c53
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Li, J, Li, S, Alim, M. A. and Chen, G (2003) The Degradation of ZnO Varistors Packed with Epoxy Insulation Layers. The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, China. 27 - 30 Oct 2003. pp. 137-140 .

Record type: Conference or Workshop Item (Other)

Abstract

Zinc oxide (ZnO) varistor is a highly non-linear semiconducting device that is widely used as a transient voltage surge protector in electrical and electronic systems. One of the major challenges in the continuous development of varistors has been to reduce the long-term degradation. The degradation can take a number of forms when the varistor is subjected to a series of pulses or to a constant applied dc or ac voltage. There will be a distinct asymmetry in the I-V characteristics once the degradation has taken place, with the leakage current being greater in both directions of the applied field. Because varistors are usually operated under the voltage, any increase in leakage current is of major importance. This is especially so for the station-class varistors that are used in power distribution systems, because the power dissipated within the varistor represents a loss in distributable power. Under extreme conditions, particularly at elevated temperatures, the increase in leakage current can be sufficient for the associated Joule heating to cause thermal runaway of the varistor.

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More information

Published date: 2003
Additional Information: Event Dates: October 27-30, 2003
Venue - Dates: The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, China, 2003-10-27 - 2003-10-30
Keywords: ZnO varistor, Epoxy insulation, degradation
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 258516
URI: http://eprints.soton.ac.uk/id/eprint/258516
ISBN: 7-900371-56-7
PURE UUID: 67e3f162-30e9-483f-828a-8a2aca9868fa

Catalogue record

Date deposited: 10 Nov 2003
Last modified: 29 Jan 2020 15:32

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