Mechanism of HVDC wall bushing flashover in nonuniform rain

A model which assumes a dry zone of changing length is used to determine conditions which may lead to flashover of HVDC wall bushings in nonuniform rain. The key parameter in the proposed mechanism is the ratio of the resistance per unit length of the wet region to the resistance per unit length of...

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Bibliographic Details
Published in:IEEE transactions on power delivery 1991-01, Vol.6 (1), p.448-455
Main Authors: Scheider, H.M., Lux, A.E.
Format: Article
Language:English
Subjects:
240202 - Power System Networks, Transmission & Distribution- DC Systems- (1990-)
Applied sciences
Contamination
CURRENTS
DC SYSTEMS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
Electrical engineering. Electrical power engineering
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
Electrical resistance measurement
ENERGY SYSTEMS
Exact sciences and technology
FLASHOVER
HVDC SYSTEMS
HVDC transmission
Insulators
Laboratories
MATHEMATICAL MODELS
MOISTURE
PHYSICAL PROPERTIES
Pollution measurement
POWER SYSTEMS
POWER TRANSMISSION AND DISTRIBUTION
Rain
Testing
Various equipment and components
Voltage
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Summary:A model which assumes a dry zone of changing length is used to determine conditions which may lead to flashover of HVDC wall bushings in nonuniform rain. The key parameter in the proposed mechanism is the ratio of the resistance per unit length of the wet region to the resistance per unit length of the drier region. Measurements of the surface resistivity are presented for horizontal insulators, including wall bushings, with different surface conditions subjected to rain. Such measurements can be utilized to evaluate the potential capability of various materials to prevent wall bushing surface flashover in nonuniform rain.< >
ISSN:0885-8977
1937-4208
DOI:10.1109/61.103770