156
Capacitor discharge time 2 min.
Ground conduc-
tor current
Preparations
- Only perform the measurement if an insulation resistance test has been carried out
successfully
- Direct method: The device must be isolated from earth. No other connections to the
earth potential are permitted (e.g. data lines, fitting, etc.)
- Connect the mains cable
- Re-connect the DC cables to the battery - Note: battery voltage, take safety precau-
tions
Once the battery charging system has been connected, switch it back on. The battery
charging system must be in charge mode when measuring the ground conductor current,
as otherwise the measurement result will be unreliable.
Only the leakage currents that occur at grid frequency may be included (50 - 60 Hz function
of ammeter). High-frequency leakage currents distort the measurement results *).
*) These requirements comply with DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. Also
refer to the applicable requirements and standards in your country.
There are two methods that may be used to measure the ground conductor current:
- Direct method: Device must be completely isolated and must not exhibit any links to
another earth potential
- Differential current method:
The measurement can be taken on the battery charging system (via an adapter lead) or in
the distributor. If taking the measurement in the distributor, ensure that there are no live
conductors in the immediate vicinity, or that there are no other consumers depending on
the same circuit.
Direct method - Ground conductor current measured using ammeter on the ground con-
ductor
1 Measuring device
2 Battery charging system
8 Isolated setup of test piece
9 Measuring line
Example: Measuring the ground conductor current in
the distributor
WARNING! An electric shock can be fatal. Capacitors can charge during the in-
sulation resistance measurement. After carrying out the insulation resistance
measurement, check that all tested potentials are de-energised before continuing
with the safety inspection. Alternatively, the capacitors can be discharged by
short-circuiting the tested potentials or via the discharge function on the insulation
tester.
PE
mA
L1
1
2
999
N
PE L1 N
8
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