SDMO R33C3 User And Maintenance Manual page 44

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Type B differential relay:
Use:
Differential relay 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.
Setting:
1. Use a screwdriver to adjust the current
threshold using the setting potentiometer
(1) and
to 0.03 A (30 mA).
2. Use a screwdriver to adjust the time delay
using the setting potentiometer (2) and the
micro-switches (4) to 0s (automatic).
3. Test the residual current device using the
"Test" button on the relay.
Risk of electric shock.
The generating set's differential relay is factory-set with a current threshold of 0.03 A (30 mA) and with an
automatic time delay (0 s).
Any change to the setting on the residual current device could pose a risk to personal safety. The user will be held
liable - any changes must only be made by trained, qualified engineers.
DANGER
If the setting is modified, it is essential to restore the original settings after use.
the micro-switches (4)
Test Button
(3)
Sensitive area (4)
(white = position of micro-
switches)
Time setting
potentiometer (2)
Current threshold potentiometer
(1)
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