CAJ | 학술논문

随着电网的日益坚强，电源容量不断增加，母线背后阻抗不断减小，越来越多的长线路末端发生故障时，母线电压下降不明显，容易出现断路器失灵保护电压闭锁元件定值灵敏度不足的问题，进而导致断路器失灵保护拒动。在分析现有解决方案的基础上，提出了一种新型的基于电流量的失灵保护闭锁方案。利用故障后失灵支路电流情况及其占母线上所有连接支路的比率关系，开放该支路的失灵闭锁元件。RTDS仿真验证结果表明，该方案能有效解决工程实际问题。
수착전망적일익견강，전원용량불단증가，모선배후조항불단감소，월래월다적장선로말단발생고장시，모선전압하강불명현，용역출현단로기실령보호전압폐쇄원건정치령민도불족적문제，진이도치단로기실령보호거동。재분석현유해결방안적기출상，제출료일충신형적기우전류량적실령보호폐쇄방안。이용고장후실령지로전류정황급기점모선상소유련접지로적비솔관계，개방해지로적실령폐쇄원건。RTDS방진험증결과표명，해방안능유효해결공정실제문제。
As power grid grows increasingly strong,its capacity becomes bigger and the impedance of the buses becomes smaller.When a fault strikes at the end of a long transmission line,the sensitivity of circuit breaker failure protection”s voltage blocking setting could become inadequate,which will leads to the circuit breaker failure and even protection failure.A novel circuit breaker failure blocking method based on current rather than voltage-only is proposed.The new method adopts the proportion of the current of the fault line and goes to the sum of the currents of all lines connected to the bus as the tripping threshold to unblock the circuit breaker failure blocking unit.The result of RTDS simulation has proved the new method is able to thoroughly solve the problem under discussion thoroughly. This work is supported by State Grid Liaoning Electric Power Co.Ltd.(No.2013YF-25).