Testing the performance of three-phase induction watthour meters in the presence of harmonic distortion

Papers Presented at the 33rd Annual Conference Rural Electric Power Conference Pub Date : 1989-04-30 DOI:10.1109/REPCON.1989.95525

A. Girgis, T. Baldwin, E. Makram, H. Fortson

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引用次数: 19

Abstract

The authors deal with computer-based testing of a three-phase induction watthour meter in the presence of harmonic distortion. Two three-phase harmonic generators produce the distorted current and voltage waveforms. Each waveform has a prespecified harmonic magnitude and phase. Therefore, balanced or unbalanced conditions can be simulated in the testing. A fiber-optic sensor is designed to convert the rotation of the disk of the meter into digital signals to be stored in an IBM PC/AT. A data acquisition system transfers the samples of current and voltage waveforms so that the power and energy can be computed for comparison. Induction watthour meters are shown to be affected by harmonic distortion. The error increases at light loading conditions. For a three-element watthour meter, the maximum negative error was observed when the harmonic current was in phase with the harmonic voltage. This applies to all harmonic orders. The maximum positive error was observed when the harmonic current was shifted by 180 degrees .<>

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测试三相感应电能表在谐波失真情况下的性能

本文讨论了在谐波失真情况下三相感应电能表的计算机测试。两个三相谐波发生器产生扭曲的电流和电压波形。每个波形都有预先指定的谐波幅度和相位。因此，在测试中可以模拟平衡或不平衡的情况。设计了一种光纤传感器，用于将仪表磁盘的旋转转换为存储在IBM PC/AT中的数字信号。数据采集系统传输电流和电压波形的样本，以便计算功率和能量以进行比较。感应式电能表受到谐波失真的影响。在轻载荷条件下，误差增大。对于三元电能表，当谐波电流与谐波电压相同时，其负误差最大。这适用于所有谐波阶。当谐波电流移动180度时，观察到最大的正误差。

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Papers Presented at the 33rd Annual Conference Rural Electric Power Conference

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