直流系统中空气断路器和熔断器级差配合试验研究

直流系统中空气断路器和熔断器级差配合试验研究模拟变电所直流电源系统断路器和熔断器级差配合的实际使用环境,编制了多种试验方案,对蓄电池直流系统的两段保护和三段保护直流断路器及熔断器级差配合的选择性进行了上下级配合的实际分短路分断试验,取得了大量有价值的数据和波形,提出了试验结论和验证了直流系统直流断路器级差配合的原则.该项研究还针对目前浙江电网直流系统中存在的问题提出了提高直流系统可靠性的改进措施,为今后直流系统断路器和熔断器的设计选型和技术改造提供了依据.

Stepped Coordination Testing and Research of Air- blast Circuit Beaker and Fusible Cut- out in the Direct Current System

This research project simulated the practical use environment of stepped coordination of circuit breakers and fusible cut-outs in the direct current (dc) power source system of substation,worked out varied testing schemes,conducted the practical separating shortcircuit-breaking tests of upper and tower step coordination of the selectivity of stepped coordination of two - section protection and three section protection dc circuit breakers and cut-outs in storage battery dc system,with a large number of valuable data and wave forms obtained and testing conclusion put forward and the sepped coordination principle of dc circuit breakersin the dc system verified. This research project put forward the improvement measures on raising the reliability of dc system in view of the problems existing currently in the dc system of Zhejiang power Grid,providing the basis for the future type selection,design and retrodit of circuit breakers and fusible cut - outs of dc system.