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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >An Improved Optically Based PD Detection System for Continuous On-line Monitoring of HV Cables
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An Improved Optically Based PD Detection System for Continuous On-line Monitoring of HV Cables

机译：改进的基于光电的局部放电检测系统，用于高压电缆的连续在线监测

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摘要

An optically-based remote sensing technique using a laser source, polarization scrambler, standard single mode fibers, fiber polarizer, electro-optic (EO) modulator and optical receiver, for continuous on-line monitoring of partial discharges (PD) in high voltage cable joints is proposed. Both the fiber polarizer and EO modulator, which are placed near cable joints, are passive without any power requirements. An EO modulator with no electrical bias, which operates close to the half-intensity point, was used and proved to have much better light transmission performance and higher measurement sensitivity than the bias modulator approach investigated earlier. Various multiplexing techniques including optical switches and a fused fiber coupler have been investigated in order to implement multi-channel monitoring so that one laser source can be used to provide light to several fibers. The revised PD optical remote sensing technique has been applied to practical PD measurements on both 132 kV cable joint at the University of Southampton in the UK and 400 kV cable joints at Sudkabel GmbH in Germany. Obtained results have verified the principle and demonstrated the effectiveness of the developed technique.
机译：一种基于光学的遥感技术，使用激光源，偏振扰频器，标准单模光纤，光纤偏振器，电光（EO）调制器和光接收器，用于连续在线监视高压电缆中的局部放电（PD）提出了关节。放置在电缆接头附近的光纤偏振器和EO调制器都是无源的，不需要任何功率。使用了一个无电偏置的EO调制器，该电调制器在接近半强度点的位置工作，并且与早期研究的偏置调制器方法相比，具有更好的透光性能和更高的测量灵敏度。为了实现多通道监控，已经研究了包括光开关和熔融光纤耦合器在内的各种多路复用技术，以便可以使用一个激光源向多根光纤提供光。经过修订的局部放电光学遥感技术已应用于英国南安普敦大学的132 kV电缆接头和德国的Sudkabel GmbH的400 kV电缆接头的实际局部放电测量。所得结果验证了该原理并证明了所开发技术的有效性。

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