IEC 61557-9:1999
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

Standard No.

IEC 61557-9:1999

Release Date

1999

Published By

International Electrotechnical Commission (IEC)

Status

Be replaced 2014-12

Replace By

IEC 61557-9:2009

Latest

IEC 61557-9:2023 PRV

Scope

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.

IEC 61557-9:1999 history

• 0000 IEC 61557-9:2023 PRV
• 2017 IEC 61557-9:2014/COR2:2017 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 - Proposed Horizontal Standard;
• 2014 IEC 61557-9:2014/COR1:2016 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 - Proposed Horizontal Standard
• 2014 IEC 61557-9:2014 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 - Proposed Horizontal Standard
• 2009 IEC 61557-9:2009 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
• 1999 IEC 61557-9:1999 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