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In large, complex electrical supply systems, as are to be found in all large production plants and photovoltaic installations, a flexible solution for monitoring tasks is required. To be able to quickly and reliably locate insulation faults in these systems, systems for insulation fault location are often used. However, to locate insulation faults all the way down to a load or a PV module, portable systems for insulation fault location, such as the EDS3090, are used. With the variant EDS3090PG, insulation fault location independent of fixed installed EDS systems is also possible.
The insulation fault locator EDS190P in the device series EDS3090 has been further developed and is now available as the EDS195P. Its new functions significantly simplify insulation fault location and mobile residual current measurement.
The portable EDS195P locates insulation faults in a wide range of IT systems. These include, e.g. control circuits AC/DC 24 V to 230 V as well as main circuits AC/DC 24 V to 960 V. It is used for example on ships, in industrial plants, power stations, on oil and gas rigs and in photovoltaic installations.
The EDS3090 is particularly suitable for usage in extensive PV installations with up to DC 960 V that are designed as IT systems in the context of DIN VDE 0100-410 (VDE 0100-410). The insulation monitoring device ISOMETER® isoPV detects all insulation faults in the DC and AC area of the system and continuously indicates the level of insulation in the PV installation. Insulation fault location in a large installation with several hundred thousand modules and many kilometres of cable can be very time consuming. With the conventional method of insulation measurement the PV installation must be partially or entirely shut down. The defective circuit can only be found by shutting down the strings step-by-step and simultaneously monitoring the insulation value displayed on the insulation monitoring device.
With the EDS3090PG comprising an insulation fault locator EDS195P, two measuring clamps of type PSA3052 and a locating current injector PGH185, the PV module causing the fault is located without the need to shut down the installation. Using the two measuring clamps PSA3052 operated in parallel it is possible to mask the operating current of the PV modules and to detect the locating current generated by the locating current injector.
The usage of the EDS3090PG therefore offers time and cost-saving insulation fault location that is also reliable. The availability of the PV installation is significantly increased and the operator does not suffer any feed losses.