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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Flashover and partial discharge characteristics of fiber of valve tower in converter station
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Flashover and partial discharge characteristics of fiber of valve tower in converter station

机译：换流站阀塔纤维的闪络和局部放电特性。

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摘要

Thyristors of valve tower in converter station are controlled through fiber. Valve fiber withstands strong electric field and harmonic voltage. Partial discharge (PD) and flashover faults sometimes happen in valve tower. In this paper, flashover test is conducted for different fiber sheath materials under different voltage types (DC voltage and harmonic voltage superimposed on DC voltage). PD characteristics of fiber under combined voltage of AC voltage and DC voltage are measured. And influence of sheath materials on the PD inception voltage is discussed. Test results indicate that the flashover voltages of fiber sheath materials are different under different voltage types. Sheath material with higher surface resistivity has higher flashover voltage under DC voltage. Moreover, PD of fiber under vertical electric field concentrates on the falling edge of the positive half-circle of the AC voltage, and the PD strengthens with the increase of DC voltage. And the sheath material whose ratio of volume resistivity to relative dielectric constant is approximate to that of the fiber body (SiO), has higher PD inception voltage.
机译：换流站阀塔晶闸管通过光纤控制。阀纤维可承受强电场和谐波电压。阀塔有时会发生局部放电（PD）和闪络故障。本文针对不同的纤维护套材料在不同的电压类型（直流电压和叠加在直流电压上的谐波电压）下进行了闪络测试。在交流电压和直流电压的组合电压下，测量光纤的局部放电特性。并讨论了护套材料对PD起始电压的影响。测试结果表明，纤维护套材料的闪络电压在不同电压类型下是不同的。在直流电压下，具有较高表面电阻率的护套材料具有较高的击穿电压。此外，光纤在垂直电场作用下的局部放电集中在交流电压正半圆的下降沿，随着直流电压的增加，局部放电会增强。并且，体积电阻率与相对介电常数之比近似于纤维体（SiO）的护套材料具有更高的PD起始电压。

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