GB/T 21705-2008 in English

《GB/T 21705-2008低压电器电量监控器》由TC189（全国低压电器标准化技术委员会）归口，TC189SC2（全国低压电器标准化技术委员会低压直流设备与应用分会）执行，主管部门为中国电器工业协会。
本标准是依据ＩＥＣ 和国家相关电能质量标准，根据目前低压电器电量监控器市场发展的要求制定的。其目的在于规范低压电器电量监控器的开发、生产和检验。本标准适用于一般低压电器电量监控器和基于现场总线的电量监控器，本标准规定的监控器适用于参比频率为５０Ｈｚ（或６０Ｈｚ）的电路，能检测电压、电流、有功功率、无功功率、功率因数、频率、电能等参数，也可附带开关量输入和开关量输出，通过开关量输出实现某种保护或控制功能，并可作为监控模块与低压电器配合使用，使不带智能控制的低压电器具有智能控制和网络控制
功能。本标准不适用于便携式监控器。本标准中规定了一般低压电器电量监控器和基于现场总线的电量监控器。本标准不适用于便携式监控器。

Scope

This standard applies to general low-voltage electrical appliance power monitors and fieldbus-based power monitors (hereinafter referred to as monitors). The monitors specified in this standard are suitable for circuits with a reference frequency of 50Hz (or 60Hz), and can detect voltage and current , active power, reactive power, power factor, frequency, electric energy and other parameters, can also be attached with switch input and switch output, through the switch output to achieve a certain protection or control function, and can be used as a monitoring module in conjunction with low-voltage electrical appliances , so that low-voltage electrical appliances without intelligent control have intelligent control and network control functions. This standard does not apply to portable monitors. This standard specifies the classification, working conditions, structure and performance requirements, test methods and test rules, etc. of monitors.