|Current load sensor||Measuring transformer of the current TAR 25/5 up to 100/5.|
|Heat load sensor||Temperature sensor PT100 or PTC thermistor or thermal switching contact|
|Signalling relay||1 X 1P|
The ground fault equipment series ISOLGUARD HIG9x are intended for ground fault monitoring of both single-phase and threephase insulated IT protective systems, which are designed and operated in accordance with following standards: IEC 60364-7-710, SN EN 50 522, SN EN 61 936, SN 33 3210, SN EN 61557-8, SN 332140:87+A:90 article 6.
These devices provides for monitoring of both three-phase and single-phase IT- protective systems, namely up to maximum operational voltage 275 VAC (eventually 3x275 VAC). If the ground fault monitoring for the three-phase or single-phase IT-protective system with higher operational voltage is required, an artificial neutral is to be created, namely using the chokes TL400 (catalogue No. 70504), TL600 (catalogue No. 70601), TL1600 (catalogue No. 71601), or TL6003 (catalogue No. 70603). The centre created in this way will be then connected to the terminal of the HIG9x ground fault equipment.
The ground fault monitors are provided with display unit, which displays the numerical values of the measured insulation resistance. There are also control push-buttons for setting the monitoring parameters as well as the signalling LEDs for status indication of both the monitored protective system and the ground fault unit. According to the type, the ground fault unit may be completed with the modules (produced by HAKEL) for remote signalling about the status of the monitored protective system. One or two built-in signalling relays with change-over contact allow the connection of an alarm signalling device. It is possible to perform both local and remote functionality test of the ground fault monitor.
The ground fault monitor HIG9x can communicate with the supervisory computer via the industrial bus RS485, using the communication protocol based on the PROFIBUS protocol.