PROBLEM TO BE SOLVED: To reduce the cost by reducing the number of connections of auxiliary instrument transformers while maintaining reliability of a voltage measurement.;SOLUTION: A three-phase voltage relay includes: auxiliary instrument transformers 2a and 2c which measure a voltage of a main circuit; a detecting circuit 4 which is connected to the auxiliary instrument transformers 2a and 2c and detects the voltage; an A/D converter 5 which is connected to the detecting circuit 4 and digitally converts a signal; a multiplexer 6 which is connected to the A/D converter 5 and combines a plurality of signals into a single signal; and a CPU 7 which is connected to the multiplexer 6 and performs a protection operation. The auxiliary instrument transformers 2a and 2c have two phases, and the other phase is branched by an output of the auxiliary instrument transformers 2a and 2c of two phases, and each phase is input to an adder circuit 10, thereby generating the signal.;COPYRIGHT: (C)2012,JPO&INPIT
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机译：解决的问题：在保持电压测量可靠性的同时，通过减少辅助仪表变压器的连接数来降低成本;解决方案：三相电压继电器包括：辅助仪表变压器2a和2c，用于测量a的电压。主电路检测电路4，其连接到辅助仪表变压器2a和2c并检测电压。 A / D转换器5，其连接到检测电路4并且数字地转换信号;复用器6，其连接到A / D转换器5，并将多个信号组合成单个信号; CPU 7，其连接到多路复用器6并执行保护操作。辅助仪器变压器2a和2c具有两相，另一相由两相辅助仪器变压器2a和2c的输出分支，并且每一相被输入到加法器电路10，从而产生信号。 ：（C）2012，JPO＆INPIT
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