The CHAdeMO (Charge de Move) electrical interface for electric cars was developed in Japan and is now in cross-brand usage and can be found at every third charging station worldwide. To guarantee electrical safety in the charging circuit, the DC charging station is set up as an unearthed DC power supply (IT system) complying to IEC 61851-23.
During charging, an insulation monitoring device (IMD) in the charging station monitors the entire charging circuit right up to the electric vehicle. The vehicle’s IMD needs to be deactivated during this process.
Bender now offers, in addition to the CCS-compliant isoEV425, the new IMD isoCHA425 complying to the Japanese CHAdeMO charging standard for DC charging stations.
The isoCHA425 is designed for voltages between DC 50 V and 500 V. Single-pole insulation faults are detected and reported within 1 second, two-pole insulation faults within 10 seconds. The maximum permissible system leakage capacitance Ce is 2 µF.
The device measures insulation resistance RF and leakage capacitance Ce to earth. It also measures voltages Un between L+ and L-, UL+e between UL+ and earth, and UL-e between UL- and earth.
The isoCha425 detects the fault location from the minimum value of the DC system voltage, i.e. the distribution of the insulation resistance between the DC+ and DC- conductors, and indicates this with a plus or minus sign for the insulation resistance measurement. Partial resistances can be calculated from the total insulation resistance RF and the fault location (R %). It is also possible to assign a detected fault or faulty conductor to an alarm relay via a menu.
If the values RF or Un continuously exceed the response values activated in the "AL" menu for the period ton, a message is output via the LEDs and relays K1 and K2 according to the alarm assignment set in the "out" menu. The operating principle of the relay (n.o./n.c.) and the fault memory can also be set there.
Device functionality can be checked using the test button "T". Parameters are assigned to the device via the LC display and the control buttons on the front panel; this function can be password protected.
The device can be parameterised via the BMS bus, e.g. via a BMS Ethernet gateway (COM465IP) or via Modbus RTU.
Bender GmbH & Co. KG
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