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一、概述频率是衡量电能质量的主要指标之一。目前,在电力系统中,常用的工频、中频、高频频率表,一般都是指针式频率表,其最高精度等级为0.1级(按中间频率的百分数算)。频率表的检定方法一般有以下几种:对于级别较低的频率表,常用0.1级(或0.2级)频率表做标准,采用直接比较的方法去检定。对于级别较高的频率表,可以用两种方法
First, an overview of frequency is one of the main indicators of power quality. At present, commonly used power frequency, intermediate frequency, high frequency frequency meter in the power system are usually the pointer type frequency meter, the highest precision level is 0.1 (calculated as a percentage of the intermediate frequency). Frequency table verification methods are generally the following: For the lower level of the frequency table, commonly used 0.1 (or 0.2) frequency table to do the standard, using direct comparison method to test. For the higher level of the frequency table, you can use two methods