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TYPE KA CARRIER AUXILIARY RELAY
BALANCED AIK �APS
POLAR UKIT PERMAHEHT MAGNET FLUX PATHS
and within the magnetic frame. RRT is the operating
coil and receives its energy from the local battery
when either CSP or CSG is closed.
ing coil and receives its energy from the carrier
transmitted either from the local transmitter or the
one at the other end of the line section.
coils are connected to oppose each other with the
operating coil, RRT operating to close the RRP and
RRG contacts and trip; and the holding coil, RRH to
hold the RRP and RRG contacts open and block trip
ping. The restraining torque of the RRH coil
ficient to overcome the operating torque of the RRT
coil.
Consequently. RRP and RRG ccmtacts cannot
close as long as RRH is energized.
Alarm Unit
The alarm element is similar in construction to
the receiver element except that it is energized by a
single coil and operates a single set of contacts.
The coil is energized by the received carrier to close
the contacts and give an alarm.
higher-pick-up than that of the receiver element in
order to obtain a direct check on the sensitivity of
the tubes in the carrier transmitter-receiver.
failure of the alarm relay to pick-up when carrier is
4
4.
Fig.
Polar Unit Permanent Magnet Flux Paths.
RRH is the hold
These two
is
suf
This element has a
The
SHUNT
UNBALAKCED AIR GAPS
started indicates insufficient output from the trans
mitter-receivers.
Operation lnd icator
The operation indicator gives a visual indication
of a carrier tripping operation for phase faults by the
distance relay through the RRP contacts.
ground fault carrier relaying operation, the indicating
contactor switch (ICS) located in the ground relay
will drop a target.
CHARACTER IST ICS
The characteristics of the various elements of the
relays are as follows:
CSP or CSG Coil
&
CSP
CSG Tapped Resistor
Carrier Resistor
RRT Operating Coil
RRT Coil Resistor
RRH Holding Coil
AL Alarm Coil
Operation Indicator (1 amp. )
183A062
For a
48V
12SV
250V
Avg.
Avg.
Avg.
Ohms
Ohms
Ohms
27
27
27
200
600
1250
2000
3750
19000
1100
1100
1100
1320
5000
11200
1700
1700
1700
500
500
500
0.1
0.1
0.1
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