Ice flashover performance and its characterization parameter of composite insulator with booster sheds

Abstract

In order to investigate the ice flashover performance and characterization parameter of composite insulators, numerical calculation was applied to simulate the icicle growth and make comparison with different structures. It was found that the number of booster sheds existed an optimized range and saturated icicle bridged degree of big sheds or booster sheds could be considered as the characterization parameter to reflect the ice flashover voltage. Booster sheds applied to 500 kV composite insulators show its advantage on anti-icing performance. However, when design for lower structural height insulators, such as 110 kV composite insulators, excessive booster sheds could form a shorter flashover path. Experiments show there is a good corresponding relation between flashover voltage and saturated icicle bridged degree. Moreover, when applied to 500 kV composite insulators, saturated icicle bridged degree of big sheds dominated the flashover process, while the value of booster sheds played more important role for 110 kV samples.Index Terms -Booster shed, bridged, icicle, flashover, insulator Manuscript

Voltage Distribution and Flashover Performance of 220 kV Composite Insulators under Different Icing Conditions

“…In order to obtain melting ice, the door of the climate room was opened to let the temperature increase above 0 °C. In the existing studies, the voltage distributions of the iced insulators were obtained by simulations [19][20][21], but the simulated results have not been validated by experiments. In this paper, a 50 kV voltage Ua was applied to the high-voltage terminal of the test insulators.…”

“…The detailed test procedure to determine U50 is shown in [23,29]. Provided that N is the number of test results, the first flashover voltage is marked with U1, the second one U2,and the Nth Un, U50 can be expressed as: In the existing studies, the voltage distributions of the iced insulators were obtained by simulations [19][20][21], but the simulated results have not been validated by experiments. In this paper, a 50 kV voltage U a was applied to the high-voltage terminal of the test insulators.…”

“…The booster sheds effects on the flashover performance of ice-covered post insulators have been studied using experimental and simulation methods [18]. An improved hypothesis or theory regarding the effects of booster sheds was proposed in [19], a method for booster sheds design using geometric modeling and the Taguchi method was presented in [20]. Till now, a lot of researches have been carried out to study the icing flashover performance and relevant improvement methods of the composite insulators.…”

“…However, not much work has compared the booster sheds' effects on the insulators' electrical and flashover performance under different icing conditions. Voltage distributions of the iced insulators were obtained by simulations [19][20][21], but the voltage distributions have not been studied using experimental methods. What is more, in recent years, composite insulators containing ZnO resistors have been used in regions where thunder and lightning happen frequently [22], however, little work has been done to study the influence of ZnO resistors on these insulators' electric and flashover performance under icing conditions.…”

“…When compared with the existing studies [19][20][21], voltage distributions of the test specimens were measured using experimental methods.…”