Ohmic-Reach Adjustment; Angle Of Maximum Torque - GE CEY51A Instructions Manual

GEK-1275
TABLE XII
CONTROL SPRING ADJUSTMENT
Phase- Set
Unit Reach Connect Lead to Relay Jumper
Angle VA-B
Value
Loca-
Tap Res.
Studs as Follows Relay Meter Set of
tion Unit Ohms Tap Lead A Lead B Lead C Lead D Studs
Reads At Current
Top f/l1-2 1.5 100%
14-15 13-16-17 5 7
6-8-10
3000 1.5V 3.0A
Middle f/l2-3 1.5 100% 13-16-17 18-19-20 7
9 6-8-10
3000 1.5V 3.0A
Bottom f/l3-1 1.5 100% 18-19-20 14-15 9
5 6-8-10
3000 1.5V 3.0A
Top f/l1-2 0.4 50% 14-15
13-16-17
5
7 6-8-10
3000 1.5V 9.OA
Middle f/l2-3 0.4 50% 13-16-17 18-19-20
7
9 6-8-10
3000 1.5V 9.OA
Bottom f/l3-1 0.4 50% 18-19-20 14-15
9 5 6-8-10
3000 1.5V 9.OA
Top f/l1-2 3.0 100% 14-15
13-16-17
5 7
6-8-10
3000 1.5V 3.0A
Middle f/l2-3 3.0 100% 13-16-17 18-19-20 7 9
6-8-10
3000 1.5V 3.0A
Bottom f/l3-1 3.0 100% 18-19-20 14-15 9 5 6-8-10
3000 1.5V 3.0A
Top f/l1-2 .75 50% 14-15
13-16-17
5 7
6-8-10
3000 1.5V 9.OA
Middle f/l2-3 .75 50% 13-16-17 18-19-20 7 9
6-8-10
3000 1.5V 9.OA
Bottom f/l3-1 .75
50% 18-19-20 14-15
9 5 6-8-10
3000 1.5V 9.OA
OHMIC-REACH ADJUSTMENT
The basi c mi nimum reach of the mho units can be adjusted by means of the
rheostats, which are accessible from the front of the relay. Connect the relay as
show in Figure 10. Set the restraint tap and the basic-minimum-reach taps in the
positions shown in Table IX. With current at 5 amperes, and voltage at 120 volts,
set the phase shifter so that the phase-angle meter reads the angle shown in the
table for the unit to be checked. Now reduce the voltage VAB to the set value shown
in Table IX and adjust the appropriate rheostat so that the unit picks up in the
ampere range shown in Table IX.
ANGLE OF MAXIMUM TORQUE
The angle of maximum torque of the mho units can be adjusted by means of
adjustable reactors that are accessible from the front of the relay.
Use the
connections in Figure 10. Set the restraint taps and the basic-minimum-reach taps
in the positions shown in Table XIII.
The procedure used in setting the angle of maximum torque is to adjust the
reactor so that the pickup amperes, at a specified set voltage, VAB, will be the
same at angles leading and lagging the maximum-torque angle by 300. The test
angles, set voltages and the pickup amperes are shown in Table XIII. First, the
reach of the unit at its angle of maximum torque should be checked, and adjusted if
necessary as described in paragraph (c) in the ACCEPTANCE TESTS section and Table
IX. Next, set the phase shifter so that the phase angle meter reads 3300 (Note that
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