Technical aspects affecting the use of insulation fault location systems 6.2 Manual insulation fault location/Portable systems Manual insulation fault location can be implemented to meet the following requirements:a) As an addition to permanently installed EDS systems, a portable insulation fault evaluator is used for insulation fault location in secondary outgoing circuits.b) If the installation does not have an insulation fault test device, a portable insulation fault test device is used.c) If the IT system has been de-energized, a portable insulation fault test device with built-in measuring voltage source is used.
Figure 6.7: Manual insulation fault location with permanentlyinstalled EDS systems Figure 6.8: Manual insulation fault location in IT systems without insulation fault test device Note for Figure 6.9:IT system offline, i.e. the test current isgenerated by the portable insulation fault test device (PGH186) if the device is also suitable for use in earthed systems (TN, TT systems), if all poles are offline and there is no direct connection between the system and earth.
Figure 6.9: Manual insulation fault location with portable insulation fault test device indisconnected IT systems (no system voltage) Annex 1.9.2 Annex 1.9.2 Main catalogue part 1 – 08.2007/Insulation monitoring 179