电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
10期
139-143
,共5页
李振动%赵青春%董杰%宋巍%赵哲源%李亚明%王天乙%田霖
李振動%趙青春%董傑%宋巍%趙哲源%李亞明%王天乙%田霖
리진동%조청춘%동걸%송외%조철원%리아명%왕천을%전림
串联补偿%电流反向%差动保护%过渡电阻%比例系数
串聯補償%電流反嚮%差動保護%過渡電阻%比例繫數
천련보상%전류반향%차동보호%과도전조%비례계수
series compensation%current reverse%differential protection%transient resistance%ratio coefficient
根据冀北地区万顺500 kV特高压输电线路建立模型,分析串联补偿线路出现“电流反向”问题的根本原因和可能性。结合万顺具体算例,研究串补线路中差动比例系数K值在不同故障点、串补度、经高阻接地和MOV是否被击穿等情况下的变化趋势。代入现状运行方式下的具体参数,通过RTDS对模型进行数字模拟实验,深入探讨单双回串补线路运行状况下串联补偿对零序差动和分相差动保护动作特性的影响,得出过渡电阻、故障点、系统参数以及负荷变化等情况的差动保护动作结论,并给出万顺串联补偿线路保护装置的合理改进建议。
根據冀北地區萬順500 kV特高壓輸電線路建立模型,分析串聯補償線路齣現“電流反嚮”問題的根本原因和可能性。結閤萬順具體算例,研究串補線路中差動比例繫數K值在不同故障點、串補度、經高阻接地和MOV是否被擊穿等情況下的變化趨勢。代入現狀運行方式下的具體參數,通過RTDS對模型進行數字模擬實驗,深入探討單雙迴串補線路運行狀況下串聯補償對零序差動和分相差動保護動作特性的影響,得齣過渡電阻、故障點、繫統參數以及負荷變化等情況的差動保護動作結論,併給齣萬順串聯補償線路保護裝置的閤理改進建議。
근거기북지구만순500 kV특고압수전선로건립모형,분석천련보상선로출현“전류반향”문제적근본원인화가능성。결합만순구체산례,연구천보선로중차동비례계수K치재불동고장점、천보도、경고조접지화MOV시부피격천등정황하적변화추세。대입현상운행방식하적구체삼수,통과RTDS대모형진행수자모의실험,심입탐토단쌍회천보선로운행상황하천련보상대령서차동화분상차동보호동작특성적영향,득출과도전조、고장점、계통삼수이급부하변화등정황적차동보호동작결론,병급출만순천련보상선로보호장치적합리개진건의。
This paper analyzes the primary causes and its possibility of the reversed current in serial compensation lines, according to the model of Jibei Wanshun 500 kV ultra-high voltage transmission line. Besides, the variation tendencies of differential protection ratio coefficient K of serial compensation lines on the condition of at different failure points, degrees of series compensation, grounding circumstances via high resistance and MOV breakdown are discussed by specific cases in this study. Practical variables under current operation mode are taken into simulation by RTDS. The performance characteristics of zero-sequence differential and phase difference protection affected by serial compensation are presented under single/double line operation modes. Since then, the performances of differential protection with variant transient resistance, failure points, systematic variables and load are obtained, furthermore, the improvements of Wanshun serial compensation protection devices are recommended at the end.