Bender ISOMETER 425 insulation monitor

Bender ISOMETER® isoCHA425 Insulation Monitoring

The Bender ISOMETER® 425 monitors the insulation resistance RF for DC fast charging stations according to CHAdeMO standard or according to Combined Charging System (CCS) for nominal system voltage ranges between DC 0 V and 400 V.

Asymmetric insulation faults are reported with a response time ≤ 1 second. Symmetrical insulation faults within 10 seconds. The maximum permissible system leakage capacitance Ce is 5 μF.

In order to meet the requirements of applicable standards, customised parameter settings must be made on the equipment in order to adapt it to local equipment and operating conditions.

Please heed the limits of the range of application indicated in the technical data. Any use other than that described in this manual is regarded as improper.

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Advantages:

  • Monitoring the insulation resistance for DC charging stations according to CCS or CHAdeMO
  • Detection of asymmetrical insulation faults in the DC system voltage range between 50 V und 400 V within 1 s
  • Detection of symmetrical insulation faults within 10 s
  • Measurement of the system voltage (true RMS) with undervoltage and overvoltage detection
  • Measurement of DC system voltages to earth (L+/PE and L-/PE)

Specification

  • Monitoring of the insulation resistance RF of DC charging stations in accordance with the CHAdeMO standard or Combined Charging System (CCS).
  • CHAdeMO (Mode CHd):
    – Maximum system leakage capacitance 1.6 μF per conductor
    – Detection of insulation faults in the system voltage range from 50 V to 400 V
    – Response for time one-pole insulation faults RFU:
    • RFU ≤ 100 kΩ: max. 1 s
    • 100 kΩ < RFU ≤ 2 MΩ: max. 10 s
    – Response time for two-pole insulation faults RFS: max. 10 s
  • CCS (Mode dc):
    – Detection of insulation faults up to 2 MΩ
    – Maximum system leakage capacitance Ce: 5 μF
    – Response time tan at Ce ≤ 5 μF or RF ≤ 100 kΩ: max. 10 s
    • Measuring the system leakage capacitance Ce
    • Measuring the nominal system voltage Un (true RMS) with undervoltage/overvoltage detection
    • Measuring the residual voltages UL1e (between L+ and earth) and UL2e (between L– and earth)
  • Selectable start-up delay, response delay and delay on release
  • Two separately adjustable response value ranges from 5…250 kΩ (prewarning, alarm)
  • Alarm output via LEDs (‘AL1’, ‘AL2’), display, and alarm relays (‘K1’, ‘K2’)
  • Automatic device self test with connection monitoring
  • Selectable N/C or N/O relay operation
  • Measured value indication via multi-functional LC display
  • Activatable fault memory
  • RS-485 (galvanically isolated) including the following protocols:
    – BMS (Bender measuring device interface) for the data exchange with other Bender
    devices
    – Modbus RTU
    – IsoData (for continuous data output)
  • Password protection against unauthorised changing of parameters
  • Stop mode to disable the measuring pulse generator

 

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