低压配电系统是指交流电压不超过1000V、直流电压不超过1500V的电力系统。在低压配电系统中，为了保障人身安全和设备的正常运行，需要采取一系列的保护措施，如接地保护、过电压保护、漏电保护等。为了确保这些保护措施的有效性，需要对其进行测试、测量或监测。而非接触式交流电压指示器就是一种用于测试、测量或监测保护措施的设备。

IEC 61557-17:2021标准规定了非接触式交流电压指示器的技术要求、试验方法、性能要求和标记等内容。其中，技术要求包括指示器的结构、工作原理、灵敏度、响应时间、电源等；试验方法包括环境试验、机械试验、电气试验等；性能要求包括指示器的准确度、重复性、稳定性等；标记包括指示器的型号、制造商、额定电压、频率等。

非接触式交流电压指示器是一种非常重要的测试、测量或监测设备，其准确性和可靠性对于保障人身安全和设备的正常运行至关重要。因此，IEC 61557-17:2021标准的制定和实施对于提高低压配电系统的安全性和可靠性具有重要意义。

相关标准
- IEC 61557-1:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements
- IEC 61557-2:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 2: Insulation resistance
- IEC 61557-3:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 3: Loop impedance
- IEC 61557-4:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 4: Earth electrode resistance
- IEC 61557-5:2007 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 5: Resistance of the main earthing conductor