JJG 1021-2007 in English

本规程适用于安装在6KV及以上电力系统中用于电流、电压互感器以及组合互感器（简称电力互感器）的首次检定、后续检定和使用中的检验。6KV以上电力系统中用的电力互感器，如果不离现场安装位置，也参照本规程检定。

Scope

This procedure is applicable to the initial verification, subsequent verification and in-use inspection of current and voltage transformers and combined transformers (referred to as power transformers) installed in power systems of 6kV and above. Power transformers used in power systems below 6kV, if they are not moved from the on-site installation location, should also be calibrated in accordance with this procedure.