引用本文:贾文超,曹嵩.大型水电机组组合型接地方式参数优化设计[J].电力自动化设备,2022,42(4):
JIA Wenchao,CAO Song.Parameter optimization design of combination-type grounding mode for large-sized hydropower units[J].Electric Power Automation Equipment,2022,42(4):
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大型水电机组组合型接地方式参数优化设计
贾文超, 曹嵩
华北电力大学 电力工程系,河北 保定 071003
摘要:
为了限制单相接地故障电流,部分大型水电机组采取了接地电阻并联电感的组合型接地方式,但接地电阻和电感的参数选取对接地故障电流、传递过电压、中性点位移电压、零序电压保护灵敏度有影响。综合考虑组合型接地方式下的接地故障电流、传递过电压、中性点位移电压、零序电压保护灵敏度指标,建立了针对水电机组组合接地参数设计的综合评价体系,并利用实际水电机组参数进行了分析计算。分析结果表明:选取合适的参数可以有效降低接地故障电流和提高保护灵敏度,同时传递过电压和中性点位移电压也不会过大。给出了参数选型的方案,希望能为组合型接地方式的参数选取提供借鉴。
关键词:  大型水电机组  单相接地故障  定子接地保护  组合型接地  高阻接地故障
DOI:10.16081/j.epae.202112032
分类号:TM772
基金项目:河北省自然科学基金资助项目(E2019502163)
Parameter optimization design of combination-type grounding mode for large-sized hydropower units
JIA Wenchao, CAO Song
Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Abstract:
In order to limit the single-phase grounding fault current, some large-sized hydropower units adopt the combination-type grounding mode of grounding resistance and parallel inductance, but the parameter selection of grounding resistance and inductance has an impact on the grounding fault current, transfer over-voltage, neutral point displacement voltage and sensitivity of zero-sequence voltage protection. Comprehensively considering the grounding fault current index, transfer over-voltage index, neutral point displacement voltage index and sensitivity index of zero-sequence voltage protection, the evaluation system for combination-type grounding parameter design of hydropower units is established. The analytical calculation is carried out with the parameters of actual hydropower units. The analytical results show that selecting appropriate parameters can effectively reduce the grounding fault current and improve the protection sensitivity, meanwhile the transfer over-voltage and displacement voltage will not be too large. The scheme for parameter selection is given, hoping to provide a reference for the parameter selection of combination-type grounding mode.
Key words:  large-sized hydropower units  single-phase grounding fault  stator grounding fault protection  combination-type grounding  high-resistance grounding fault

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