Abstract
Engineering assumptions are the key to the successful prediction of switching surge line performance by statistical methods. Based on hybrid simulator transient analysis and statistical insulation performance prediction programs, several key engineering assumptions are investigated. The insulation strength variation with stress waveshape is well known. However, the impact of this variation on tower clearances has not been well documented and is evaluated in this paper. The nature of the stress distribution also varies, depending on system conditions, breaker design and type of operation (energizing or reclosing). One aspect of this stress distribution is investigated — the allocation of surge magnitudes among the three phases. Again, some work has been devoted to defining this allocation; however, the impact on tower clearances has not been defined. The analysis of these two aspects of switching surge line performance will provide the line designer with basic information for improved engineering assumptions.
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