Maintenance
Batteries_Rail_Power_Manual_en02.docx
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9.1.4.
Measuring the insulation resistance
Target: The insulation resistance of the battery is measured.
The insulation resistance of a battery in a rail vehicle is a measure of the conductivity
resulting from moisture and contamination of the battery between the battery terminals and
the vehicle chassis. Ideally, there is no electrical conductivity here if the insulation
resistance of the battery is infinitely high.
When commissioning a new battery, the insulation resistance must be > 1 MΩ. It decreases
with the operating time (due to aerosols from the batteries, condensation, dust) and may not
fall below the following values depending on the nominal battery voltage:
Battery Nominal Voltage
Norm
Insulation Resistance
below 100V
DIN VDE 0119-206-4
10
kΩ
between 100 and 120V
DIN EN 50272 Teil 2
100
Ω per Volt Nominal voltage
above 120V
DIN EN 62485-3
09/2015
No. of cells x 2.0 V Nominal voltage Cell
x 500
Ω /V
If this minimum value is not reached, a possibly existing insulation monitor, an undesired
increased discharge and loss of battery performance may occur.
Note
For rail.power batteries, an insulation measuring instrument with a test voltage of 500 V must be
used.
Use a suitable measuring device, e.g. Fluke 1507 (HOPPECKE Mat.nr.: 4141201237), with the
settings 500 V/DC.
CAUTION!
Risk of damage to the on-board network of the vehicle.
An insulation test voltage of 500 V may damage other components connected to the battery.
Disconnect the battery from the on-board network, positive and negative terminal.
WARNING!
When carrying out measurements with an insulation measuring instrument, there is a risk of
electric shock.
There is a potential medium risk which, if not avoided, could result in death or serious injury.
Observe the safety precautions described in the documentation of the insulation measuring
instrument.
