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针对水轮发电机组保护的若干实际应用问题进行了探讨,包括厂用变压器(以下简称厂变)高压侧电流是否差入主变压器(以下简称主变)差动保护、失磁保护阻抗圆选择、转子接地保护的实现方式、注入式定子接地保护启动失灵问题、发电机复压过流保护跳母联断路器问题、接地变短路阻抗对基波零序电压定子接地保护的影响等。针对上述问题给出了具体的建议:厂变高压侧电流不计入主变差动电流计算的前提是厂变低压侧母线上发生短路故障时,该电流产生的差流不会导致主变差动保护误动;水轮发电机失磁保护宜选择静稳阻抗圆;转子接地保护宜就地安装;注入式定子接地保护动作后,动作接点不会快速返回,启动断路器失灵时可靠性有所降低;发电机复压过流保护不宜动作于跳母联断路器;应校核接地变短路阻抗对基波零序电压定子接地保护的影响。
Some practical applications of hydro generator protection are discussed, including whether the high-side current of the transformer for the plant is poorly differentiated into the differential protection of the main transformer (the main transformer) Rotor earthing protection implementation, injection stator grounding protection failure, generator overcurrent protection circuit breakers, earthing short-circuit impedance of the fundamental zero-sequence voltage stator grounding protection and so on. Specific suggestions are given in the light of the above problems: the premise that the high voltage side current of the plant is not included in the calculation of main current differential current is that when the short circuit fault occurs on the low voltage side busbar, the differential current generated by this current will not cause the main transformer to deviate Protection of mal-operation; hydro-generator loss of magnetic protection should choose a static impedance circle; Rotor grounding protection should be installed locally; Injection stator ground protection action, the action will not return quickly to the relay, Reduce the generator overvoltage protection should not be action in the jump bus breaker; should check the grounding short circuit impedance on the fundamental zero sequence voltage stator ground protection.