Westinghouse RC, Instructions Manual

Page: 55 / 114

TYP E RC AU TOMATI C RECLOSING R ELAY
Si UM I T
CI.NillT i f E LOClOtiT
(OPTII)IIAL )
IUI STOI-TO IE CCJI.
IKTED F Oil 2 � Y.A.C.
OI U!i •• O. C. , OIIU
�
DI\M OPEil TED -
1,2,3,14,1 ..
l iMI T - 1,8,9A
Y UII I T • !i , 6 , 7 , 1J
SOlDIO I D U II I T
IIESI STOI-TO
IS[
COit­
h E CT E O FOR .i<W 1.A.C.
AIID 8Y·PAS:IEO FOR
120 Y.A.C.
TIMING MOTOR
TEST SI'ITCH
TE
IIM
I
IIAl
l82A757
Fig. 2. Internal Schematic of the R C R elay, Without Z
Unit, in Typ e FT32 Case.
Y Solenoi d U n i t
The Y unit coil i s located to the rear of the front
sub-base. When energized a plunger is attracted to­
ward the rear of the relay against a spring. A micarta
disc on the front end of the plunger actuates contacts
Y5, Y6
and
Y7.
As the disc moves to the rear it re­
leases the latch arm. When released the latch arm is
rotated counterclockwise by the tension of the moving
contact spring of contact
Y13
and a small helical
spring. This rotation blocks the full reset when Y is
de-energized. Thus, the
Y
unit has three positions as
shown in Table I. The Y unit, is reset by the tt5 cam
on the timing drum , which rotates the latch arm clock­
wise against the tension of the
Y13 moving contact
spring.
IJPPER SG UIIIT
CUMULATIVE LOUOUT
(OPTIOIAL)
RESI STOR-TO lE ___.
C
OII
M
E
C T EO
fOil .NO
Y.A.C. OII ll!o Y.U.C.,
Ollll
OIIUM Of'ERATEO -
W
1 , 2 , 3 ,
...
114
l UII
I T - 8,
1!,9.1.
Y UM I T - !i, 6, 7 , 1 J
Z UII I T - 10, 1 1 , 1.1.
REII STOI-TO
I[
COIIMECTEO FOI 2110
Y.A.C. AIIO
6f·P.USUI
f01 120 Y.A.C.
TUUIIG MOTOR
TEST SWITCH
TERMIIAL
l82A758
Fig. 3. Internal Schematic of the RC R elay, With Z Unit,
In Type FT32 C ase.
I n s ta nta neo u s X U n i t a nd O p ti o na"l C u m u l a tive Lock o u t
The X unit i s a clapper type auxiliary relay sim­
ilar to the type SG with two make contacts, X8 and
X9. The
X
unit also operates a ratchet mechanism,
w hen supplied, to count the number of breaker opera­
tions . After a preset n umber of counts the ratchet will
open the cumulative lockout contact, 9A. The ratchet
teeth are numbered so that remaining operations be­
fore lockout can be visually determined. The relay
case cover must be removed to reset the ratchet.
I n s ta nta neo u s Z U n i t
The Z unit i s a c lapper type auxiliary relay
(standard SG) with one m ake contact,
Z lO,
and make­
break contacts ,
Zl l
and
Z l 2.
Tabl e I
Y UNIT CONTACT POSITIONS
PLUNGER
CONTACT POSITION
POSITION Y5 Y6 Y7 Y 13
Reset Close d Open Open Closed
Latched and De-energized
Open Open Closed
(Intermediate )
Open
Energized
Open Closed Closed
Open
3
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