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Page 13
10
8
6
4
2
0
T YPICAL MAGNET ENGAGEMEN T
SETTING IN 16TH'S INCH FROM
MAXIMUM ENGAGEMENT SETTING
WITH GAP SET AT
¥32
INCH
0
8
6
5
4
3
TYPICAL GAP SETTING IN
32
NO'S INCH
WITH MAGNET IN EXTREME
OUTWARD POSITI O N
(RELAY T:ME
Tl ME VALUE FROM FIGURE
10
MULTIPLIED BY DAMPING FACTOR)
Fig.
9-
Typical Damping Factors Versus Gap Setting and Magnet Engagement
f actor. In
Figure
10
w
e
find that for a
2
volt bandwidth the time delay would be 3
seconds for a 4 volt change.
To determine the actual time to close
relay contacts multiply 3 (seconds)
x
2
(damping factor)
6 seconds actual time
delay.
CVR-1 Relay Control Adjustments
Figure 11 shows the CVR-1 Relay Control
Panel as seen facing the front of the relay
with the cover removed. The adjustments
for resistance and reactance compensation,
the switch for reversing the polarity of the
reactance compensation, and the Test Rheo
stat are all contained on this sub-panel. A
control breaker, potential and current test
terminals, and the selector switches for
automatic-manual a n d raise-lower tap
changer control are separately mounted on
the larger steel panel containing the CVR-1
relay.
These have been touched briefly in
an earlier discussion but are not within the
scope of this instruction book.
1. Test Rheostat. The Test Rheostat on
the CVR-1 sub-panel facilitates checking
and setting the relay voltage sensing ele
ment, as described earlier under two dif
ferent methods of setting. Under actual con
ditions of operation it is left in the "OFF"
position, in which there is zero resistance
between the potential supply source and the
CVR-1 voltage sensing element.
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