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WARNING: HIGH VOLTAGES MAY APPEAR ON PILOT WIRES UNEXPECTEDLY AT ANY
TIME. USE APPROPRIATE CARE WHEN MAKING CONTACT WITH PILOT
WIRES OR EQUIPMENT CONNECTED TO THEM
The pilot wire protective equipment, if installed, is designed to limit the pilot-wire
voltages to a level that will not damage the wires or equipment connected to them. It does
not limit the voltages to a level that is safe for unprotected personnel contacting the pilot
wires or connected equipment. THEREFORE, USE APPROPRIATE CARE WHEN MAKING
CONTACT WITH PILOT WIRES, EVEN WHEN THE PILOT-WIRE PROTECTIVE EQUIPMENT IS IN
PLACE.
In view of the vital role of protective relays in the operation of a power system, it is
important that a periodic test program be followed. It is recognized that the interval
between periodic checks will vary depending upon environment, type of relay and the
user's experience with periodic testing. Until the user has accumulated enough experience
to select the test interval best suited to his individual requirements, it is suggested that the
points listed under
ACCEPTANCE TESTS
Check the items described under
MECHANICAL INSPECTION.
deterioration or other damage. Check that all connections are tight by observing that the
lockwashers are fully collapsed.
CONTACTS
Examine the contacts for pits, arc or burn marks, corrosion, and insulating films. For
cleaning contacts, a flexible burnishing tool should be used. This consists of a flexible strip
of metal with an etch-roughened surface, resembling in effect, a superfine file.
polishing action is so delicate that no scratches are left, yet any corrosion is thoroughly and
rapidly cleaned. The flexibility of the tool ensures the cleaning of the actual points of
contact. Do not use knives, files, abrasive paper or cloth of any kind to clean relay contacts.
ELECTRICAL TESTS
The tests described in the electrical inspection of the
periodic checks for the SPA relays. Refer to Figures 15 through 19 for the test plug
connections.
If a relays fails to pass one or more of these tests, it requires servicing.
GEK-65512
PERIODIC CHECKS AND ROUTINE MAINTENANCE
be checked at an interval of from one to two years.
ACCEPTANCE TESTS
Examine each component for signs o f o verheating,
VISUAL INSPECTION AND
-
ACCEPTANCE TESTS
18
The
suffice as
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