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Before putting protective relays into ser
CAU TION:
vice, remove all blocking which may have been in
serted for the purpose of securing the parts during
shipment, make sure that all moving parts operate
freely, inspect the contacts to see that they are
clean and close properly, and operate the relay to
check the settings and electrical connections.
APPLICATION
The type TR-1 relay is an auxiliary relay ener
gized by protective relays to trip two circuit breakers.
Sufficient contacts are provided to seal in both trip
circuits until the breaker auxiliary switches operate.
Indication is provided by targets which drop whenever
the switch units within the relay operate.
CONSTRUCTION
The type TR-1 relay consists of two direct cur
rent,
doubletrip indicating contactor switch units
(ICS). The ICS is a small clapper type device.
netic armature, to which leafspring mounted contacts
are attached, is attracted to the magnetic core upon
energization of the switch. When the switch closes,
the movin g contacts bridge two station ary contacts,
completing the trip circuit. Also during this operation
two fingers on the armature deflect a spring located
on the front of the switch, which allows the operation
indicator target to drop. The target is reset from the
outside of the case by a push rod located at the bot
tom of the cover.
The front spring, in addition to holding the tar
get, provides restraint for the armature and thus con
trols the pickup value of the switch.
OPERATION
The coils of the ICS units are normally connect
ed in series and energized through the trip contacts
of the protective relays. The contacts of one unit
Supersedes I.L. 41-758.1
Complete Revision
INSTALLATION
INSTRUCT IONS
TYPE TR-1 AUXILIARY TRIPPING
INDICATING RELAY
A
mag
Westinghouse
OPERATION
•
AND
seal in the trip circuit and trip one breaker. The con
tacts of the other switch are for tripping a second
breaker.
It is necessary to add resistance in the ICS unit
coil circuit to limit current in these coils. Normally
these coils are connected in series with an external
resistance. (See Fig. 3). For the 1 ampere ICS unit
relay 22 ohms are used for a 125 volt d-e trip circuit
and 44 ohms for a 250 volt d-e trip circuit. These
values of resistance are obtained by using one or two
22 ohm resistors. For the 0. 2/2.0 ampere ICS unit re
lay a 100 ohm mid-tap resistor is used for 0-125 volt
d-e trip circuit and a 200 ohm mid-tap resistor for a
250 volt d-e trip circuit. With these resistance va
lues, the relay operating time is approximately 74
cycle (60 cycle basis).
CHARACTER! STICS
The ICS will trip at a current value between 1.0
and 1.2 amperes d.c. for the 1 ampere ICS unit. The
current should not be greater than the particular ICS
top setting being used for the 0. 2/2.0 ampere ICS unit.
The operation indic at ortarget
trip circuit should draw at least 2Yz times rated value
in order to keep the time of operation of the switch to
a minimum and provide positive operation.
Trip Circuit Constants
1 ampere rating: 0. 1 ohms d.c. resistance
0.2/2.0 ampere rating: 0.2 tap- 6.5 ohms
2
Coil Ratings
Tap Rating
1
0.2
2.0
EFFECTIVE OCTOBER 1960
I.L. 41-7SB.1A
MAINTENANCE
•
should drop freel y. The
2 tap
0. 15 ohms
-
Coil rating in amperes d.c.
1 second
continuous
140
5
0.4
1 1.5
3. 2
88. 0
'
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