Abstract
The traditional polarity comparison based travelling wave protection, using the initial wave information, is affected by initial fault angle, bus structure, and external fault. And the relationship between the magnitude and polarity of travelling wave is ignored. Because of the protection tripping and malfunction, the further application of this protection principle is affected. Therefore, this paper presents an ultra-high-speed travelling wave protection using integral based polarity comparison principle. After empirical mode decomposition of the original travelling wave, the first-order intrinsic mode function is used as protection object. Based on the relationship between the magnitude and polarity of travelling wave, this paper demonstrates the feasibility of using travelling wave magnitude which contains polar information as direction criterion. And the paper integrates the direction criterion in a period after fault to avoid wave head detection failure. Through PSCAD simulation with the typical 500 kV transmission system, the reliability and sensitivity of travelling wave protection were verified under different factors’ affection.
Highlights
According to the protection principle, travelling wave protection methods include travelling wave differential protection, travelling wave distance protection, travelling wave amplitude comparison protection, and travelling wave polarity comparison protection [1, 2].Travelling wave differential protection principle is simple and clear
Based on the relationship between the magnitude and polarity of travelling wave, this paper demonstrates the feasibility of using travelling wave magnitude which contains polar information as direction criterion
Comparing with the traditional polarity comparison travelling wave protection, the new travelling wave protection combines the relationship between amplitude and polarity
Summary
According to the protection principle, travelling wave protection methods include travelling wave differential protection, travelling wave distance protection, travelling wave amplitude comparison protection, and travelling wave polarity comparison protection [1, 2]. Travelling wave amplitude comparison protection principle has improved much compared to other protection principles It is affected by the bus structures, fault inception angles, and different thresholds, too. The traditional travelling wave polarity comparison protection principle has a lot of advantages: high operation speed, clear direction discrimination, and simple protection principle. It is affected by some things: fault initial angles, different bus structures, different fault locations, and even threshold. If those disadvantages can be overcome, a new travelling wave protection principle can be got [10–12]. There is no transformer technology limit in the travelling wave protection principle anymore [13–16]
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