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发明授权
CN101267107B 抑制电网单相短路电流的方法 有权 转让

抑制电网单相短路电流的方法
摘要：
本发明为一种抑制500kV枢纽变电站220kV侧母线单相短路电流的方法。电网由于大量采用自耦变压器压器导致500kV枢纽变电站220kV母线单相短路电流大于三相短路电流较多，且已经超过了断路器的额定开断能力。考虑更换自耦变压器为非自耦变压器以降低单相短路电流，实质是减少零序网接地支路。通过序网图原理分析发现更换500kV自耦变压器为非自耦变压器比更换220kV站内的自耦变压器为非自耦变压器对500kV枢纽变的220kV母线单相短路电流的作用大，实际算例也证明了理论分析的正确性。此方法为限制电网单相短路电流、增强电网运行可靠性提供了技术支持。
摘要（英）：

The present invention provides a method of inhibiting 220kV side bus single-phase short circuit current of 500kV pivotal substation. An electric grid adopting mass autotransformers makes the more 220kV side bus single-phase short circuit current of 500kV pivotal substations larger than the three-phase short circuit current, and exceeding the rated breaking ability of the circuit breaker. Considering change the autotransformer to non-autotransformer to reduce the single-phase short circuit current, reducing the grounding branch of the zero-sequence grid essentially. According to the sequence diagrams principle analyse, changing autotransformer to the non-autotransformer in 500 kV substation has a larger impact to the 220kV bus single-phase short circuit current of the 500kV pivotal substation than changing the autotransformer to the non-autotransformer in the 220 kV substation, the practical example also proves the accuracy of the theoretical analysis. The method provides technical support for the limiting the grid single-phase short circuit current, enhancing the credibility of the grid operation.

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