IEC 61557-9-1999
交流1000V和直流1500V以下低压配电系统中的电气安全 防护措施的试验、测量和监控设备 第9部分:IT系统中的绝缘故障定位设备

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 9: Equipment for insulation fault location in IT systems

标准号

IEC 61557-9-1999

发布日期

1999年09月

实施日期

废止日期

无

中国标准分类号

K20

国际标准分类号

17.220.20

发布单位

IX-IEC

代替标准

IEC 61557-9-2009

适用范围

This part of IEC 61557 specifies the requirements for insulation fault location systems which localize insulation faults in any part of the system in unearthed IT a.c. systems and unearthed IT a.c. systems with galvanically connected d.c. circuits having nominal voltages up to 1 000 V a.c., as well as in unearthed IT d.c. systems with voltages up to 1 500 V d.c., independent of the measuring principle. This part is to be used in conjunction with IEC 61557-1. NOTE 1 - IT systems are described in IEC 60364-4-41 amongst other literature. Additional data for a selection of devices in other standards should be noted. NOTE 2 - Further information on insulation fault location can be found in the following standards: IEC 60364-4-41, subclause 413.1.5.4, and IEC 60364-5-53, subclause 531.3. NOTE 3 - An insulation fault location system usually consists of several functional modules (see figure 1). All or some of the functional modules may be combined in one device. The functional modules and a short description of their function are mentioned below: - insulation monitoring device according to IEC 61557-8; - control device, portable or permanently installed: the control device specifies the sequence of the test procedure and contains logical operations for insulation fault location and for fault alarm; - test device, portable or permanently installed: the test device contains the test current generator; - coupling unit, portable or permanently installed: the coupling unit in combination with the test device constitutes the connection to the system to be monitored; - residual current transformer or current clamp: these are used for the detection of the test current and are connected to an evaluator; - evaluator, portable or permanently installed: the residual current transformers are connected to the evaluator to detect the test current. NOTE 4 - Note 3 gives an example of the functional modules in insulation fault location systems. The combination of modules may vary depending on the version (portable or permanently installed). NOTE 5 - Insulation fault location systems with an independent test current source may also be used for insulation fault location in de-energized systems.

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