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TYPE CA-5 RELAY
9.
Fig.
Diagram of Test Connections for the Type CA-5 Relay in the Type FT21 case.
means of screws for steel panel mounting or to the
terminal studs furnished with the relay for thick panel
mounting. The terminal studs may be easily removed
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
For detailed FT case information refer to I.L.
41-076.
The total resistance of the leads, connecting re
lay terminals 4 and 5 to the R terminals of the auxi
liary current transformer, must not exceed . 05 ohms.
A DJUSTMEN TS A ND MA INTEN A N CE
The proper adjustments to insure correct operation
of this relay have been made at the factory. Upon
receipt of the relay, no adjustments, other than those
covered under "Settings," should be required.
Receiving Acceptance
The following check is recommended
6
{
2�0 VOLT
CYCLE
SOURCE
60
to
insure
that the relay is in proper working order.
A. Differential Unit
Connect the relay per the test circuit ofFig. 9.
Relays and transformers of matching serial num
bers should be connected together. Use tight
screw connections between the transformer and
the relay. Do not use clip leads.
The total resistance of the leads, connecting re
lay terminals 4 and 5 to the R terminals of the auxi
liary current transformer, must not exceed .05 ohms.
1. Minimum Pickup Pass cUITent through one
restraint winding and the primary of the extern
al transformer. The relay should operate on
the 19 tap with following current.
a) Transformer Relay
b) Generator Relay
2. Percentage
Slope
relay set on 19 tap and 30 amperes smaller re-
183A360
1.0± 5% amp.
0.145 ± 5% amp.
Characteristic With
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