GE CEY51A Instructions Manual page 19

GEK-1275
setting, that is, 1.5 ohms or 0.4 ohm (the value shown in Table IX). If the
units are set on either of the remaining basic minimum reach taps, the basic
reach of the units will be within! 4% of the tap plate marking.
(d) Angle of Maximum Torgue
UnIt
For checking the angle of maximum torque the connections of Figure 10 will be
used with the restraint tap leads, and the voltage, set at the value shown in
the upper and lower portions, respectively, of Table X for the unit to be
checked. The minimum reach taps should be set to the 1.5 ohm or 0.4 ohm
position.
In checking the mho units the following procedure should be used. First set
the phase shifter so that the phase-angle meter reads 3300. Note that while
the phase angle is being set, the current should be 5 amperes and the voltage
at 120 volts. Now set the voltage at the value shown in Table X, and increase
the current slowly until the mho unit picks up. The pickup current should be
within the limits shown in the table. Now reset the phase angle at 2700 and
again check the current required to pick up the mho unit. This current should
fall within the same limits as for the 3300 check.
Note that the two angles used in the previous check, i.e., 3300 and 270 0 , are
300 away from the angle of maximum torque. An examination of the mho unit
impedance characteristic in Figure 6 shows that the ohmic reach of the unit
should be the same at both 3300 and 2700 and should be 0.866 times the reach at
the angle of maximum torque.
Reach Restraint
Tap Tap
TABLE X
ANGLE OF MAXIMUM TORQUE ADJUSTMENT TABLE
Connect leads to Relay
Studs as follows
Jumper
Relay
0-Angle Meter Reading
Angle of Test
VA~B
Pickup
location
Unit Ohms Lead A Lead 8 Lead C Lead 0 Studs
Max.Torque
Angles Set At Amps
+
Top ,,12
1 5 100%
14~ 15 13~ 1617 6~8-1O
300 0
330 & 270
45V 16~S
-17.S
M,ddle "2~3
1 5 100%
131617 18~19~20
9
6-S-10
300 0
330 & 270 45V 16.S -17.S
Bottom
,,3 ~ 1
1 5
100% 18~19~20 14-15
9
6-8~ 10
300 0
330 & 270 45V
16.S-17~S
Top
,,1 2
30 100!?'o
14~ 15 13~ 16-17
6-8~
10
300 0
330 & 270 90V 16~S - 17.S
Middle 1IJ23
30
100~·'D 13- 16- 17 18-19~20 6-S~
10
300 0
330 & 270
90V 16.S -17.S
Bottom
,,3~
1
30 10Q'Vo
18-19-20 14~15 6-S-10
300 0
330 & 270 90V 16.S -17.S
Top
,,1
~
2
04 50% 14~ IS 13~16~17 6-8-10
300 0
330 & 270
45V 31.5-33.5
Middle
,,2 3
04 50% I 316~ 17 18~19-20
9
6-S-10
300 0
330 & 270 45V 31.5 -33.5
Bottom
,,3 1
04 50% 18·1920
1415
6-S-10
300 0
330 & 270 45V 31.5 -33.5
Top
,,1 2
075 50 1l /0
14~ 15 13~ 16- 17 6-8~10
300 0
330 & 270 45V 16~S-17~S
M,ddle ,,2 3
075
Soo·c
13·16~
I 7
18~ 19~20 6-8-10
300 0
330 & 270 45V 16.S -17~S
Bottom
,,31 075
50% 18~ 19~20
14-15
9 6-8~10
300 0
330 & 270
45V
16~S
-
17~S
+ Pickup amps should be as close to equal as possible for the 3300
&
2700 tests _
17