变电站■接线中母线电压互感器缺省的设计及研究

DESIGN OF POTENTIAL TRANSFORMER OMITTED AT BUSBAR IN BREAKER-AND-A-HALF CONFIGURATION SUBSTATION

在11/2主接线的变电站中，当母线保护不采用母线电压信号时，提出了不设母线电压互感器，可节省两套母线电压互感器及其避雷器。如果需要母线电压测量值，则可通过可编程控制器控制的切换开关来实现，取自于与母线相联的进出线或变压器的电压互感器二次回路。

In breaker-and-a-half configuration substation. it is raised not to install potential transformer at bus because the bus protection doesn't adopt the signal of bus voltage. So two sets of potential transformers at bus and their arresters can be omitted. If necessary. the measured value of bus voltage can be obtained through switching from the secondary measuring circuit of potential transformer linked to in-or-out line or transformer connected to the bus. Voltage switching can be realized by a set of switch device developed with programmable controller.