Page 6
TRA NSFORMER
290 B445GOI
184A 635HI2
POTENTIOMETER
POTENTIOMETER
AL RELAY
25B96 47H
Q6---
RECTIFIER---
1546138
r
STATIONA RY--
.
PL CONTACT
I82A880GOI
120X RELAY-
REACTOR
290B444GOI
POTENTIOMETER
500
0HMS,50WIITT
1703532H06
RESISTOR
6 OHMS,25 WATT
0401298H84
REVERSING
SWITCH
I84A878HOI
AR RELAY
25B9647H 06
DISC
COMPOUNDING
RESISTORS
30000HMS
25 WATT
1202954
STATIONARY
PR CONTACT
162A880GOI
120 Y RElAY
22DI520 H 0 2
2�B9647HO �
4�00 OHMS,
r
182A874HOI
THERMISTOR--
1000 OHMS AT 25'C
I82A879HOI
Fig.
4
CVR-1 Relay Internal Connection Diagram
volts.
This method is adequate for most
conditions of operation and where settings
within
±
1% of desired values are satis
factory.
For more exact setting a voltmeter of
better than 1% accuracy class should be
connected from PTT1 to PTT2 as shown in
Figure
5,
It is convenient to apply an ex
ternal variable voltage source to PTT1 and
PTT2, reading on the voltmeter the voltage
at which the 90R and 90L contacts close.
If
desired, a constant voltage source may
be applied between PTT2 (ground) and the
load side of the potential breaker on the
main control panel. This, in conjunction
with the Test Rheostat (RH), will furnish a
variable voltage across PTT1 and PTT2.
Turning the Test Rheostat knob (RH) clock
wise inserts resistance between the poten
tial supply terminals and the CVR-1 sensing
circuit.
From this point the procedure is
exactly as outlined on Page
7
under the
heading "Setting the CVR-1 Relay with Load
Tap Changer Energized". Observe the fol
lowing cautions before attempting this pro
cedure.
CAUTION: Extreme care must be taken to in
sure that the breaker in the potential circuit is
in the OFF position and that the ground side of
the test source is connected to PTT2. These
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