GB20052-2013　三相配电变压器能效限定值及能效等级

China's leading enterprise in variable frequency power measurement and metering

National variable frequency power measuring instrument (metering station) founder

Research and development unit of national variable frequency power metering standard

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Hunan Yinhe Electric Co., Ltd. (hereinafter referred to as Yinhe electric) is the drafting unit of the national standard for variable frequency electric quantity measuring instruments and the initiator, builder and maintainer of the construction of the national variable frequency electric quantity traceability system.

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