变电站扩建工程中电压互感器并列回路二次接线的改进措施

变电站扩建工程中,同一电压等级母线,新上电压互感器具有二个主二次绕组(一个用于测量、保护,一个用于计量),而站内原有电压互感器仅一个主二次绕组(测量、保护和计量公用),常规母线电压并列回路无法实现站内电压互感器具有一个主二次绕组和二个主二次绕组的母线电压回路的并列。本改进措施,通过对母线电压并列条件的分析,增加并列条件,使用一个闭锁继电器,成功地解决了这一问题,并广泛应用于存在同类型问题的变电站扩建工程中。

Improvement measures for the secondary wiring of the parallel circuits of voltage transformer in the substation expansion project

In the substation expansion project,for the same one busbar,the newly installed voltage transformer has two main secondary windings(one voltage circuit for measure and protection,one voltage circuit for meter),but the exixting voltage transformer in the substation has only one main secondary winding(only one voltage circuit for measureing protection and metering),so it can not realize its busbar voltage parallel through conventional parallel circuits.This improvement measures have sucessfully solved this problem,and are widely used in the substation expansion projects with the same problems.