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15 -
c) The response of the high ,set element may be similarly checked •
The permissible pick up tolerance should not exceed
+
10
% ..
3.
Check correct functioning of tripping circuit (with circuit
breaker if possible) and indicating circuits all in conjunc-
tion with directional relay 7SP88 if fitted.
4. Restore equipment to proper operating condition.
Important:
After testing the relay it is essential that the correct type
of plastic front c?ver is refitted. Check that the cover has the
~
engraved type designation 7SK88 •• - .• A.
•
•
8.
Maintenance
The unit has no particular maintenance requirements. All measure-
ment circuits are static "and maintenance free. The output relay
is covered with a transparent plastic wrap (cover) •.
An occasional functional test is recommended. The tripping circuit
and power Circuit breaker should be included in the test, together
with any associated elements (e.g. 7SP88 directional element) •
In the event that a component-becomes damaged or unservicable
the complete PCB or assembly can be easily replaced without re-
calibration •
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