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Performance Evaluation and Comparison of High Voltage Insulators under Different Working Conditions | ||
| Al-Ma'mon College Journal | ||
| Article 1, Volume 0, Issue 31, 2018, Pages 119-136 | ||
| Authors | ||
| Koasay Abdul Sattar; Jabbar Qasim Fahad | ||
| Abstract | ||
| Outdoor insulators (porcelain anti-fog disc, porcelain aerodynamic rod, epoxy–resin post) have been tested in the laboratory to study their insulating performance in clean, dry and polluted conditions, under the effect of transient and 50Hz A.C voltage. Such voltages are assumed to simulate lightning and switching over voltages, as well as normal operating voltage. Experimental results show that the 50% negative impulse flashover voltage is always higher than positive. Furthermore, the positive switching impulse flashover values are nearly the same for dry and wet conditions, while the influence of rain is much more significant on negative polarity. Generally, rain tends to smooth the difference between the 50% negative and positive impulse flashover voltages. | ||
| Keywords | ||
| High Voltage Insulators; Flashover; Pollution; Sparkover voltage; Coordinating Gap | ||
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