Directional Check; Renewal Parts - GE CEY51A Instructions Manual

GEK-1275
With restraint tap settings and connections as per Table XIV, set the phase
shifter so that the phase-angle meter reads 315 0 • set VAS to 45 volts and the
current to pickup amperes. Adjust the appropriate reactor so that the unit just
picks up. Now check the pickup current at 2550. The pickup current at both test
angles should be within! 2% of the value listed in the table. After the setting is
made make sure the reactor lock nuts are tight.
DIRECTIONAL CHECK
With the relay connected per Figure 10, and restraint taps in 100%. allow the
relay to preheat for approximately 15 minutes at rated voltage.
Set the phase-angle meter at the angle of maximum torque and reduce the voltage to 2
volts. The relay contact must close over the range of 6-60 amperes.
With the potential circuit short-circuited on itself, the contacts must remain open
over the range of 0-30 amperes.
Should the MB unit fail to pass either test, the core must be adjusted. The core
and coil assembly is shown in Figure 1?
By use of a special wrench (0178A9455 Pt.I) the core may be rotated 360
0
in either
direction without having either to hold nut
lip
or to retighten any parts after the
final position of the core has been determined.
The final position of the core is that position where the unit passes both the above
directional check tests.
RENEWAL PARTS
It
is recommended that sufficient quantities of renewal parts be carried in
stock to enable the prompt replacement of any that are worn, broken or damaged.
When ordering renewal parts, address the nearest Sales Office of the General
Electric Company, specify quantity required and name of the part wanted, and give
complete nameplate data.
If
possible give the General Electric requisition number
on which the relay was furnished.
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