0.05级三相电能表标准装置

三相电度表用于测量三相交流电路中电源输出（或负载消耗）的电能。它的工作原理与单相电度表完全相同，只是在结构上采用多组驱动部件和固定在转轴上的多个铝盘的方式，以实现对三相电能的测量。三相电度表可分为有功电度表和无功电度表；由于三相电路的接线形式的不同，又有三相三线制和三相四线制之分。本三相电能表标准装置由信号源、控制部分、标准电能表等组成，采用虚拟负荷法将被检电能表与标准电能表比较，由误差计算器计算出电能误差。本装置可量传0.1级及以下三相电能表。

Three-phase energy meters are designed to measure the electric energy output by a power supply or consumed by loads in three-phase alternating current (AC) circuits. Their operating principle is identical to that of single-phase energy meters, but their structure adopts multiple sets of driving components and multiple aluminum disks fixed on the rotating shaft to realize three-phase energy measurement. Three-phase energy meters can be classified into active energy meters and reactive energy meters; additionally, they are divided into three-phase three-wire and three-phase four-wire types based on the different wiring modes of three-phase circuits. This three-phase energy meter standard device consists of a signal source, control unit, standard energy meter, and other components. It uses the virtual load method to compare the energy meter under test with the standard energy meter, and calculates the energy error via an error calculator. This device can calibrate three-phase energy meters with an accuracy class of 0.1 or lower.