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TYPE CA-S RELAY
Fig. 11. External Schematic Diagram of the Type CA-5 Relay in the Type FT21 case for Differential Protection
of a Generator.
tated by experience to be suitable
application.
All contacts should be periodically cleaned. A
contact burnisher S#182A836H01 is recommended for
this purpose. The use of abrasive material for clean
ing contacts is not recommended, because of the
danger of embedding small particles in the face of
the soft silver and thus impairing the contact.
I
Repair Cal
brat ion
Use the following procedure for calibrating the
relay if the relay has been taken apart for repairs or
the adjustments disturbed. This procedure should not
be used until it is apparent that the relay is not in
proper
working
order
(See
8
to
the particular
"Acceptance Check").
1
2
10
J
Ptl.
2
DEVICE HUMBER CHART
87
- GENERATOR PERCENTAGE
PH. 2
DIFFERENTIAL RELAY, TYPE CA-S
- RESTRAINING COIL OF THE TYPE
87R
CA-S RELAY
870P - OPERATING COIL OF THE TYPE
CA-S RELAY
WL
- AUXILIARY TRIPPING RELAY
86
TYPE
52
PH.3
- POWER CIRCUIT BREAKER
a
- BREAKER AUXILIARY CONTACT
T C
- BREAKER TRIP COIL
ICS
- INDICATING CONTACTOR SWITCH
the shaft.
2. Contacts - Adjust the stationary contact so
that 3/8 inch contact separation is obtained when
the moving contact is held in the maximum open
position.
3. Minimum
Pickup - Adjust
such that the relay will just operate with the
following currents flowing in one restraint wind
ing and the primary of the operating transformer
set on tap 19.
a) Transformer Relay
b) Generator Relay
PH.
3
ALARM
183A362
the
spiral spring
1.0 amp.
0.145 amp.
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