Insulation monitoring and insulation fault location
The larger the unearthed system (IT system) to be monitored, the more difficult it is to locate possible insulation faults. With the aid of automatic insulation fault location systems, precisely this challenge can be addressed while the system is in operation. As a result, system availability is considerably increased while downtimes are minimized. Additional electrical components are required for insulation fault location systems.
The iso685-D-P version of the iso685 series can be used for systems with insulation fault location. A built-in locating current generator creates a limited locating current to earth when an insulation fault occurs. This locating current can be variably adjusted. With insulation fault locators from the ISOSCAN® series, this locating current can be assigned to a defective load using a measuring current transformer. The iso685-D-P communicates with the EDS440 and EDS441 insulation fault locators via an RS-485 sensor bus or top-hat rail bus. All settings for the EDS44x devices can be operated and configured via the iso685-D-P web server. It is possible to configure the parameters for each channel separately or all channels at the same time.
… in coupled systems
The iso685-D-P insulation monitoring device can also be used in applications with coupled systems. Thanks to the EDSsync function, all iso685-D-P devices in a group and consequently also all EDS devices connected to it participate in the insulation fault location. This function is independent of whether the insulation monitoring in the coupled systems is performed via ISOnet or by the disabling of a digital input.