Insulation monitoring for DC charging stations
Bender has launched a new combined insulation monitor for DC fast charging stations.
Until recently two devices were required for insulation monitoring in DC fast charging stations. The combined device isoCHA425HV+AGH420-1 supports the two common charging standards (CCS and CHAdeMO).
A galvanically isolated Modbus RTU interface is available for communication with the device. Customer-specific parameters are preset for the respective standard. Changes to the settings can be accomplished via a pushbutton and menu structure on the device or via the Modbus protocol. The device is designed for voltages of up to 1000V, thus already taking ever increasing battery voltages into account.
In addition to monitoring the insulation level, the device is also capable of measuring the nominal voltage during charging and will alarm if the voltage exceeds or drops below self-defined limit values. Furthermore, the system leakage capacitance of the charging station and the vehicle is monitored. If insulation faults occur, the fault location is displayed (DC+/DC-/symmetrical). This helps the service technician to assess the status of the charging station and facilitates fault location.
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