CAJ | 학술논문

电流差动保护应用于超高压输电线时主要受线路分布电容电流的影响.同塔四回线由于线路回数多,分布电容的加大导致电容电流对差动保护的影响更为复杂.基于线路的π形等效模型,结合四回线母线的连接形式,利用六序分量法对同塔四回线电容电流补偿式进行解耦,提出适合于同塔四回线的时域电容电流补偿方案,最后利用PSCAD/EMTDC建立同塔四回线模型.仿真结果表明,此电容电流补偿方案能有效提高电流差动保护的性能.
전류차동보호응용우초고압수전선시주요수선로분포전용전류적영향.동탑사회선유우선로회수다,분포전용적가대도치전용전류대차동보호적영향경위복잡.기우선로적π형등효모형,결합사회선모선적련접형식,이용륙서분량법대동탑사회선전용전류보상식진행해우,제출괄합우동탑사회선적시역전용전류보상방안,최후이용PSCAD/EMTDC건립동탑사회선모형.방진결과표명,차전용전류보상방안능유효제고전류차동보호적성능.
The application of current differential protection on EHV transmission lines is mainly affected by the distributed capacitance current. Such an effect is even more significant in four-parallel lines due to the increased number of circuits and increased amount of mutual distributed capacitance. Based on the n model of transmission lines, this paper proposes to decouple the four-parallel lines capacitance current compensation formula by utilizing the six-sequence component method and presents a time domain solution to compensate the capacitance current on four-parallel lines. Simulation result by PSCAD/EMTDC shows that this new capacitance current compensation scheme can effectively enhance the performance of current differential protection.