真空发电机断路器并联断口电流转移分析

CURRENT TRANSFER PROCESS IN OPEN OPERATION BETWEEN PARALLELED BREAKS OF A VACUUM GENERATOR CIRCUIT BREAKER

提出了 1种采用新型并联断口的真空发电机断路器。这种断路器每相有 2个并联单元 ,1个单元 (VD)主要承载大的额定电流 ,另 1个单元 (VI)主要开断大的短路电流。在开断过程中VD首先打开 ,当全部的电流通过VI支路时使VI打开分断电流。该文对这种开断原理中的电流转移过程进行了试验模拟 ,试验中最大电流有效值为 2 4kA ,试验结果表明在该文的试验条件下 ,电流每次都能成功地从VD转移到VI中。对电流转移过程进行了理论分析和仿真 ,仿真结果与试验结果相近。该文的分析有助于新型真空发电机断路器的研制。

A new kind of vacuum generator circuit breaker (VGCB) is introduced. The new VGCB have 2 breaks in each phase. One break (VD) can carry high rated current; the other (VI) can interrupt large short current. In open operation, it is required that VD opens first and when the total current passes through VI then VI opens. An experiment, which can simulate the situation, is shown. In this experiment up to 24kA(r.m.s) sinusoidal current is used and current can transfer from VD to VI successfully. In addition to the experiment, a theoretical analysis is made and a typical result is simulated. The simulation is similar to the experiment one. From the experiment and theoretical results it is known that the new VGCB's design is feasible.