针对换流站阀塔光纤出现闪络和局部放电的问题,在直流电压叠加不同频率的交流电压下对光纤护套材料进行闪络试验,并测试实际光纤在工频叠加直流电压下的局部放电特性,分析护套材料对局部放电起始电压的影响.结果表明:交直流电压的比例不同,光纤护套材料的闪络电压也不同.S形布置的实际光纤在弱垂直分量电场下的局部放电主要集中在交流电压正半周的下降沿,并且护套材料的体积电阻率和相对介电常数的比值与光纤本体的比值越接近,其局部放电起始电压越高.
Aiming at the flashover and partial discharge (PD) problems of optical fiber in valve tower for converter station, flashover tests were conducted on optical fiber sheathing materials under DC voltage superimposed AC voltage with different frequencies. Meanwhile, the PD characteristic of real fiber was measured under DC voltage superimposed AC voltage with power frequency, and the influence of sheath-ing materials on the PD inception voltage was analyzed. The results show that the flashover voltages of fiber sheathing materials are different under different ratio of AC and DC voltages. The PD of real fiber arranged with S shape under weak vertical electric field concentrates on the falling edge of the positive half-circle of AC voltage. The PD inception voltage increases when the ratio of volume resistivity and dielectric constant of sheathing material gets closer to that of the fiber.
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