基于三次谐波相角突变原理的发电机定子接地保护

A GENERATOR GROUNDING FAULT PROTECTION BASED ON PHASE-ANGLE MUTATION OF THIRD HARMONIC VOLTAGE

提出了基于 3次谐波相角突变原理的发电机定子接地保护及其算法 ,用数字仿真方法分析了灵敏度并和其它原理的微机保护方案作了比较 ,结果表明该原理适用于各种接地方式的大型汽轮发电机 ,并且灵敏度很高。同时 ,还具有可靠性高。

On thebasis of thetheoryof phase\|angle mutation of third harmonicvoltage a protection scheme forgenerator statorgrounding faultand its algorithm are put forward. This scheme is comparedwith micro\|computer protectiveschemes based on otherprotectionprinciples, comparison result shows that this scheme is applicable for large capacity generator with all kinds of grounding system, especially it is of high sensitivity under arc suppression coil grounding or non\|grounding. Otherwise, This scheme possesses high reliability, and is not prone to affected by surge suppressors installed at the terminals of large generator.