The larger the unearthed system (IT system) to be monitored, the more difficult it is to locate possible insulation faults. This challenge is met with the help of automatic insulation fault location systems, the function of which can be carried out during operation. The results are increased system availability and minimised downtime periods. Additional electrical components are required for insulation fault location systems.
The iso685D-P variant of the Bender insulation monitoring device ISOMETER® iso685-D can be used for systems with insulation fault location. An integrated locating current generator creates a limited locating current to earth when an insulation fault occurs. This locating current can be adjusted. With insulation fault locators of the ISOSCAN® series, this locating current can be assigned to a defective load using a measuring current transformer. The iso685-D-P can communicate with the insulation fault locators EDS440 and EDS441 via an RS-485 sensor bus or via a backbone bus. All required settings for the EDS440 and EDS441 can be made via the iso685-D-P. It is possible to program each channel separately or all channels together.
New measuring methods allow locating high-impedance faults with high system leakage capacitances and low locating currents. The faulty channels are indicated on the display of the iso685-D-P and can be replaced by plain text messages. For example, in the event of an insulation fault on a motor the message "Insulation fault compressor 1" could be displayed. This allows the location of a fault without having to study the wiring diagram and therefore facilitates the insulation fault location. Of course, all the features of the iso685-D-B variant are included in the iso685-D-P.
In DC systems, the iso685-D-P can be triggered and issue a prior warning if there is a DC shift voltage measured against earth. The corresponding response values for these prior warnings and the disconnection can be adjusted in 5-V steps.
The iso685D-P variant of the Bender insulation monitoring device ISOMETER® iso685-D can be used for systems with insulation fault location. An integrated locating current generator creates a limited locating current to earth when an insulation fault occurs. This locating current can be adjusted. With insulation fault locators of the ISOSCAN® series, this locating current can be assigned to a defective load using a measuring current transformer. The iso685-D-P can communicate with the insulation fault locators EDS440 and EDS441 via an RS-485 sensor bus or via a backbone bus. All required settings for the EDS440 and EDS441 can be made via the iso685-D-P. It is possible to program each channel separately or all channels together.
New measuring methods allow locating high-impedance faults with high system leakage capacitances and low locating currents. The faulty channels are indicated on the display of the iso685-D-P and can be replaced by plain text messages. For example, in the event of an insulation fault on a motor the message "Insulation fault compressor 1" could be displayed. This allows the location of a fault without having to study the wiring diagram and therefore facilitates the insulation fault location. Of course, all the features of the iso685-D-B variant are included in the iso685-D-P.
In DC systems, the iso685-D-P can be triggered and issue a prior warning if there is a DC shift voltage measured against earth. The corresponding response values for these prior warnings and the disconnection can be adjusted in 5-V steps.
