云南电力技术
雲南電力技術
운남전력기술
YUNNAN ELECTRIC POWER
2014年
6期
117-120
,共4页
单相断线%故障%调度%保护%处置
單相斷線%故障%調度%保護%處置
단상단선%고장%조도%보호%처치
single-phase line break%fault%dispatching%relay protection%disposal
用对称分量法对单相断线故障进行理论分析，得出断线相各序电流与断线前的负荷电流成正比的结论。指出若轻载或空载线路发生此类故障，由于零序电流较小保护装置可能不动作的情况。结合一起220 kV线路单相断线的实际案例，分析单相断线故障对实际电网造成的影响及保护未动作的原因，详细介绍调度员综合故障信息对故障的判断及处置过程，为今后调度员处理此类故障提供了宝贵经验。
用對稱分量法對單相斷線故障進行理論分析，得齣斷線相各序電流與斷線前的負荷電流成正比的結論。指齣若輕載或空載線路髮生此類故障，由于零序電流較小保護裝置可能不動作的情況。結閤一起220 kV線路單相斷線的實際案例，分析單相斷線故障對實際電網造成的影響及保護未動作的原因，詳細介紹調度員綜閤故障信息對故障的判斷及處置過程，為今後調度員處理此類故障提供瞭寶貴經驗。
용대칭분량법대단상단선고장진행이론분석，득출단선상각서전류여단선전적부하전류성정비적결론。지출약경재혹공재선로발생차류고장，유우령서전류교소보호장치가능불동작적정황。결합일기220 kV선로단상단선적실제안례，분석단상단선고장대실제전망조성적영향급보호미동작적원인，상세개소조도원종합고장신식대고장적판단급처치과정，위금후조도원처리차류고장제공료보귀경험。
Based on the theoretical analysis of single-phase line break fault by using symmetrical component method, it is proved the phase sequence current is proportional to the pre-fault load current.If a fault occurs on light load or no-load line without relay protection action due to the low zero sequence current, it is difficult for the persons on duty to detect any anomalies form monitoring system.Combined with a actual case of 220 kV single-phase line break fault, the influence after fault on power-grid and the reason of protection action failure are analyzed.The diagnosis and disposal process of dispatchers by synthesizing fault information are also proposed.It is hopeful to provide beneficial reference for the power dispatcher in dealing similar defaults.
