零损耗深度限流装置的优化与运用

电力系统中,由于主变的扩容,主变容量增加,随之带来了系统短路电流的增加、断路器开断能力不足、系统动、热稳定不够等一系列问题。为了解决上述问题,设计时在主变下方加装限流电抗器以降低系统的三相短路电流,确保厂用电系统发生短路时,断路器能可靠切断故障。ZLB型零损耗深度限流装置,在系统无短路电流故障发生时,电抗器阻抗很小———零损耗;在系统发生短路故障时,电抗器阻抗很大———深度限流;系统短路故障切除后,装置立即返回原工作状态。

Optimization and Application of Zero Loss Depth Limiting Device

In power system,because of the expansion of main transformer and increased transformer capacity,a series of problems come out such as increase of short circuit current,inadequacy of circuit breaker ability and system dynamic,thermal stability.In order to solve the above problems,the current limiting reactor is designed and installed under the main transformer to reduce system three-phase short-circuit current,to ensure that the circuit breaker can cut off the breakdown reliably when factory short circuit occurs.In the system without short circuit fault occurs,the reactor impedance is very small-zero loss for ZLB type zero loss depth limiting device.When short circuit fault occurs in the system,reactor impedance becomes very large——depth limiting;after resection of system short circuit fault,device will back to the original state at once.