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The relay can be used in applications
where time graded overcurrent and
earth fault protection is required.
The relay can be used to provide
selective protection for overhead and
underground distribution feeders.
Other applications include back-up
protection for transformers, generators
and HV feeder circuits and the
protection of neutral earthing resistors.
With all the current/ time
characteristics available on one relay,
a standard relay can be ordered
before detailed co-ordination studies
are carried out – a distinct advantage
for complex systems. Also, changes in
system configuration can be readily
accommodated.
An instantaneous element with low
transient overreach is incorporated
within each phase or earth fault
measuring board. This can be easily
disabled in applications where it is
not required.
For applications where the
instantaneous earth fault element is
required to have a sensitive setting
whilst remaining stable on heavy
through faults the use of a stabilising
resistor is recommended. The current
transformers for this application must
satisfy the criteria detailed under
‘ Current transformer requirements’ in
Technical Data.
The total impedance of the relay and
the series stabilising resistor is usually
low enough to prevent the current
transformers developing voltages over
2kV during maximum internal faults,
but in some applications a non-linear
resistor is required to limit this voltage.
Non-standard resistance values and
non-linear voltage limiting devices are
available.
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