3.5.5 Adjusting the genset differential protection
Before adjusting the settings on the generating set's residual current device, the following two parameters must be taken into account:
the sensitivity of the current threshold and the activation time.
The generating set's residual current device must have, in relation to the downstream device (terminal circuit):
- a sensitivity three times greater.
- a longer cut-off time.
Type A/AC
Type B
Two types of differential relay are fitted on the generating sets:
Type A:
Differential device for which operation is guaranteed:
 for residual sinusoidal alternating currents,
 for continuous pulsed residual currents,
 for continuous pulsed residual currents with a continuous component of 0.006 A with or without phase check, independent of
the polarity.
Type B:
Device for which operation is guaranteed:
 as in the case of type A,
 for residual sinusoidal currents up to 1000 Hz,
 for residual sinusoidal currents superimposed on a pure continuous current,
 for continuous pulsed currents superimposed on a pure continuous current,
 for residual currents which could come from rectifier circuits i.e.:- three phase half-wave rectifier or a three-phase full-wave
bridge rectifier, full-wave bridge rectifier between phases, with or without phase angle check, independent of the polarity.
Our residual current devices are factory-set with an activation threshold of 30 mA and with automatic cut-off. Depending on the use, if
the residual current device is modified, it is recommended to fit a seal to prevent any tampering when the generating set is being used.
Time setting potentiometer
Current threshold ad
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