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Network Relays Typel CAL16A and CAN1U
081-31090
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Fig. 5
Schematic Diagram Of Te.t Connection. For Relay Type CAll6A
MAINTENANCE
TYPE
CAN13A
RELAYS
INSPECTION AND MECHANICAL
ADJUSTMENT
1. The maln control spring of lhe Type CAN13A
relay Is adjusted so lhat lhe trip contacts are
open with zero windup on lhe control spring
adjusting shalt, and are JUBt made when lhere
are 3 halI-turnB windup (counterclockwIBe) on lhe
adjuBting shaft.
The normal pOBition of lhe
spring Is such lhat lhe right-hand (trip) contacts
just make with lhe relay de-energized.
This
can be checked by deflecting lhe right-hand
Btatlonary contact to lhe right and noting lhat lhe
moving contacts do not move to the right.
2. Items 1 to 9 w1der INSPECTION AND MECH-
ANICAL ADJUSTMENT In GEI-13580 apply to
lhe Type CAN13A relay. Item 10 under the same
heading, covering the electrical reBtralnt ele-
ment,
doeB
not apply.
CALIDRATlON TESTS AND
ADJUSTMENTS
Fig. 4 shows the test cOI;"ectlonB for checking
and adjusting both the trlppl"" and recloslng cali-
bration.
The trip seltlng should be checked first
because any adjustment of lhe trip seUlng also
affecls the reclose setting; whereaB, lhe reclose
Betting can be adjusted Independently of lhe trip
Betting
and should lherefore be made last.
Trlp.E!!!i.
Connect the relay as Bhown In Fig. 4. Wllh the
relay de-energized, lhe right-hand contact Bhould
be just made.
Wllh only lhe potenttal co\ls ener-
gized, lhe moving contacts
Bhould
pull away from lhe
trip contact. ClOBlng lhe switch In lhe current cir-
cuit to pass current lhrough lhe H wlndlng, wllh the
connections Bhown,
Bhould
produce a torque In lht
direction to
cloBe
lhe trip contact.
Wllh lhe tes.
connections Bhown, a single-phase current Is us •.
and the required slngle-phaBe current
IB
equal to
1.5 times lhe desired lhree-phase trip Betting. For
example, If it Is
deBlred
to trip at 0.005 amperes
balanced lhree-phase current, lhe ammeter A should
read 0.0075 amperes because of lhe Single-phase
cur rent.
The trip calibration can be adjusted above or
below lhe faclory setting, or the factory setting can
be restored, by adjusting lhe main control spring
adjusting Bhaft (see photographB of CAN retay,
Fig. 19 In GEI-13580). Turning this shaft clockwise
Increases lhe amount of reverse current required
for tripping, and turning the shalt counterclockwise
decreases the amount of reverse current required.
Reclosl~
To check the voltage necessary for reC\osing
connect as shown In the lower diagram of Fig. 4.
The one ohm reslslor In parallel wllh lhe phasing
(Y) winding of lhe phase shlftlng transformers has
such a low Impedance compared to the phasing
windings lhat practlcally all of lhe current read by
ammeter A passes lhrough the resistor, and lhe
ammeter reading Is equal to the voltage across lhe
resistor.
Since lhls Is a "single-phase" test, lhe
voltage applied must be 1.5 times lhe desired lhree-
phase reclose setting.
For example, for a lhree-
phase 1.5 volt reclose setting, lhe ammeter A should
read 2.25 amperes.
7
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