KX
TRANSFORMER
AL RELAY
120 X RELAY
Page 9
AR RELAY
!20 Y RELAY
Fig.
6- CVR-1 Relay Removed from Case (Rear View)
trol panel) and follow the procedure under
"Setting the CVR-1 Relay by Applying an
External Voltage". The self-sealing circuit
of the CVR-1 relay may be cleared by mo
mentarily connecting a jumper from 2 to 5.
The 120 switch performs this function in
the tap changer, clearing the self-sealing
network and applying negative compounding
to the disk of the CVR-1 relay. If desired,
a constant voltage may be applied at points
6 and 9 with the Test Rheostat being used to
obtain a variable voltage. A voltmeter con-
nected across 9 and 14 will indicate the
voltage actually applied to the voltage sens
ing coil.
A somewhat more intricate test circuit is
indicated in Figure 8. Such a reconnection
following removal of the original jumpers
will provide all switching and indication re
quired to calibrate the relay and check its
performance while removed from the tap
changer control panel. Lights Rp and Lp
indicate operations of contacts 90R and 90L
www
. ElectricalPartManuals
. com
