GB/T 20840的本部分给出了电能质量参数的定义与说明,互感器对电能质量测量的影响及电能质量测试指导。本部分适用于工作在工频交流电力(供电)系统中的电磁式和电子式互感器,它具有模拟量或数字量输出,供电气测量仪表使用,用于电能质量参数的测量及其结果评定。本部分旨在为使用高压互感器测量电能质量参数提供指导。本部分中电能质量参数包括电网频率、供电电压电流幅值、闪变、供电电压暂降和暂升、电压中断、瞬态电压、供电电压不平衡、电压电流谐波和间谐波、(叠加在)供电电压上的信号电压以及快速电压变化。注: 本部分中提及的电磁式互感器的低压、中压、高压的电压范围分别是:低压为1 kV以下交流电的电压等级,中压为1 kV及以上、52 kV及以下交流电的电压等级,高压为52 kV以上交流电的电压等级。
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This part of GB/T 17215.3 specifies the terms and definitions, classifications, technical requirements, accuracy classes and test methods of static meters connected via electronic transformer (hereinafter referred to as “meters”).
This document is only applicable to newly manufactured meters which have small (signal) analog input and are installed in the networks with a reference frequency of 50Hz or 60Hz to measure the a.c.electric energy and applies to their type tests only.
This document is applicable to the meters consisting of elements such as measuring unit and display enclosed together in a meter case.
This document may be used as reference for meters that have a small (signal) analog input only in the current circuit.
This document is not applicable to meters with digital inputs.
NOTE The transformers intended to connected to the meter refer to GB/T 20840.7-2007, GB/T 200840.8-2007 and DL/T 1155-2012.
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