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GEl-12083
Current Coil
Potential Coil
A
B
C
D
3
4
19
20
3
4
14
13
5
6
17
18
5
6
20
19
7
8
15
16
7
8
18
17
9
10
13
14
9
10
16
15
> - - -
PHASE ANGLE TESTS
Connect the relay per Figure 8A for the current circuits and Figure 8B for the potential circuits.
Adjust the four variable resistors so that the left contacts just close at 120 degrees and 300 degrees
(i.e., maximum torque at 30 degrees lead).
All resistors should be adjusted to have approximately the same
ohms.
Use rated voltage and frequency, and five amperes.
With the above connections and adjustment, the relay is at unity power factor on a three-phase basis
when the phase-angle meter reads 30 degrees.
CORE ADJUSTMENT
With zero current in the current coils and rated voltage anc frequency across the potential coils, ad-
just the position of the relay core until the moving contact will remain in between the two stationary con-
tarts without touching either.
PICKUP ADJUSTMENT
With 0.025 ampere in each current coil, rated vo1taqe on each potential coil, and the phase angle set
for 30 degrees (maximum torque angle), adjust the upper control spring by turning the adjusting ring in a
counterclockwise direction until the left contact will just close.
HOLDING COIL CHECK (WHEN USED)
All checks should be made with the relay stator de-energized.
To test the right rear holding coil,
close the left contact by hand and run rated holding-coil current through this circuit (Studs 1-11).
The
holding coil should hold the left contact closed.
To check the left rear holding coil, hold the contact
arm so that the right contacts are just closed.
Apply rated holding-coil current to this circuit (Studs
2-12).
It should be possible to feel a pull on the contact arm in the direction to close the right con-
tacts still more.
TARGET CHECK (WHEN USED)
Connect Studs 1 and 11 to a variable source of d-c power.
The currents required to trip the target
should be equal to or less than the value listed below.
Target Rating - Amps
Operating Current - Amps
l.0
0.85 or less
0.2
n.17
or less
Operate the target a few times.
The target should not drop due to light shock of the relay cradle.
Make sure the target can be easily reset with the relay in the case and the cover on tightly.
HI-POTENTIAL TEST
Hipot the relay circuit at two times rated relay voltage plus
1,000
volts,
60
Hz for one minute as
listed below.
12
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