SDMO R33C3, User And Maintenance Manual

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4.2.2.4.
Setting the generating set differential protection
The setting of the generating set's residual current device is guaranteed by a differential relay fitted near the control unit (type A / AC or
B depending on the generating sets). As a result, two parameters relating to the downstream device (terminal circuit) must be set:
- Current threshold: the generating set's differential relay must be three times more sensitive than that of the terminal circuit.
- Time delay: the cut-off of the generating set's differential relay must be longer than that of the terminal circuit.
-
Type A / AC differential relay :
Use:
Differential relay 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.
Setting:
1. Use a screwdriver to set the current
threshold potentiometer (1) to 0.03 A (30
mA).
2. Use a screwdriver to set the time delay
potentiometer (2) to 0s (automatic).
3. Test the residual current device using the
"Test" button on the relay (3).
Current threshold potentiometer
(1)
Time setting potentiometer
(2)
Test Button
(3)
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