| 摘要: |
| 超／特高压线路保护的行波差动保护在实用时由于波速不一致性的影响，会产生一定的不平衡差流。在分析零模行波随传输距离的变化规律的基础上，得出检测波速随传输距离的增加而单调降低、波头Lipschitz指数随传输距离的增加而单调增加的结论。分析了过渡电阻和故障初相位对检测波速和波头Lipschitz指数的影响，得出了上述因素对两者之间的对应关系基本没有影响的结论，为波速度的估算提供了理论基础。利用输电网的线路模型对上述行波传输规律进行了验证，证实了理论分析的正确性。 |
| 关键词: 输电网 零模行波 Lipschitz指数 过渡电阻 故障初相位 |
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| Study of zero-mode traveling wave based on influence of wave velocity |
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LI Xuesheng, SHENG Hongjiang
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College of Electrical and Information Engineering，North University for Ethnics，Yinchuan 750021，China
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| Abstract: |
| Traveling wave differential protection of EHV／UHV transmission line protection may bring unbalanced differential current due to the inconsistent wave velocity. The rule of zero-mode traveling wave change along with the propagation distance is analyzed and the conclusion is that，the detected wave velocity monotonously decreases along with the propagation distance while the Lipschitz exponent of wave head increases monotonously；the transition resistor and initial fault phase have no influence on wave velocity and Lipschitz exponent of wave head. The traveling wave propagation rule is validated by simulation for transmission line model and results show the correctness of theoretical analysis. |
| Key words: electric power transmission networks zero-mode traveling wave Lipschitz exponent transition resistor initial fault phase |
