Evaluation of Lightning-Arrester Lead Length and Separation in Co-ordinated Protection of Apparatus Against Lightning

Synopsis: Insulation co-ordination is a major consideration in the cost and design of a complete electric power system and of all individual pieces of apparatus. 'Basic impulse insulation levels (BIL) have been standardized so that apparatus and protective equipment can be co-ordinated. These levels are measured by withstands on speci fied test waves. Depending upon the type of protective device and the physical arrangement of the station, short-time voltage surges having crests above the 13IL may be present and will require special consideration to insure insulation co-ordination. To determine the short-time impulse voltage characteristic of tank-type oil circuit breakers, tests were made on a representative breaker. The conclusion is that the short-time impulse characteristic of the complete breaker is comparable to that of the bushing alone.

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High-Voltage Impulse Tests in Substations [includes discussion]

Gross

Griscom

Clayton

et al. 1954

Trans. AIEE, Part III: Power Appar. Syst.

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traveling waves for voltages above the corona level. Figs. 4 and 5 for the higher voltages show that for the steeper fronts applied, the waves were practically all of more than 2 microseconds duration to crest after traveling 1 mile. Data taken in tests at the Ohio Brass Company laboratory a few years ago3 reported the same general observations, and constituted the basis for suggesting committee action relative to revising lightning arrester tests.The authors' observation that raini has little effect on attenuation of traveling waves is an interesting new contribution. Their tests relative to induced coupling factors are also of interest and should be worthy of further study.

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Evaluation of Lightning-Arrester Lead Length and Separation in Co-ordinated Protection of Apparatus Against Lightning

Cited by 9 publications

References 9 publications

Effect of surge arrester lead length on 20kV distribution transformer protection

Effect of surge arrester lead length on 20kV distribution transformer protection

Short-Time Impulse Voltage Characteristics of Tank-Type Oil Circuit Breakers [includes discussion]

High-Voltage Impulse Tests in Substations [includes discussion]

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