Westinghouse CAS-8 Instructions Manual Download | Manualshive

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C UR RENT T R ANSFORMER

TERM. B LOC KS

OPER ATION

COUNTER

10

P

a 2

P AUX.

SWIT CHES

HINGED CONTROL

MAG NETIC

PILOT VALVE

AUTOMATIC THROTTLE

P RESSURE SWIT CHES

AL ARM

a

C UT-OF F

CONTROL TERMI N A L

BLOCKS

HEATER THERMOSTAT

BREAKER P ULL ROD

(CLOSED POSITION)

This mechanism is of the compressed air closed, spring opened type. It

is pneumatically  trip free,  suitable for  ultra  high-speed reclosing,  and  is  appli
cable  to  indoor  and  outdoor  service.  Application  of  this  mechanism  is  some
times  made  where  high  speed  reclosing  is  not  required,  but  where  it  is  de
sirable  to  eliminate  large  batteries  required  for  solenoid  mechanisms.

PNEUMATIC

GOVERNOR

SWITCH

HEATER

TRIP COIL

EXHAUST

VALVE

HEATER

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Summary of Contents for CAS-8

Page 1: ...C OPERATING MECHANISM Type CAS 8 for Oil Circuit Breakers WESTINGHOUSE ELECTRIC CORPORATION SWITCHGEAR DIVISION EAST PITTSBURGH PLANT EAST PITTSBURGH PA SUPERSEDES 1 8 33 125 1 EFFECTIVE FEBRUARY 1949 Printed in U S A w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 2: ... the compressed air closed spring opened type It is pneumatically trip free suitable for ultra high speed reclosing and is appli cable to indoor and outdoor service Application of this mechanism is some times made where high speed reclosing is not required but where it is de sirable to eliminate large batteries required for solenoid mechanisms PNEUMATIC GOVERNOR SWITCH SAFETY VALVE HEATER LATCH TR...

Page 3: ...op dangerously high cylinder pressures The compressor may be dis connected by opening the AB breaker in the motor circuit leaving the heaters energized The closing equipment consists of an air com pressor with a storage tank and automatic control A pneumatic governor is set to maintain the pressure in the storage tank at a certain value the com pressor motor is started when the pressure falls appr...

Page 4: ...ICAL THROTTLE CONTroL EXHAUST PILOT VALVE IN PARALLEL WITH TRIP COIL ADJUST ARMATURE FOR Y32 fREE TRAVEL TOTAL TRAVEL AI R EXHAUST NOTE ADJUST fOR MINIMUM BLEEDER OPENING SO THAT EXHAUST VALVE WILL NOT OPERATE ON NORMAL BREAI ER CLOSING FIG I Cross Sectional View of Type CAS 8 Operating Mechanism tl t i Ul n E l e c t r i c a l P a r t M a n u a l s c ...

Page 5: ...the piston rod which also serves as a guide for the piston see Fig l It should always be removed when the breaker is to be operated by air or tripped from the closed position An external tripping handle is also provided on one side of the housing Auxiliary Switches A 10 pole and a 2 pole type W multi contact rotary auxiliariswitch each in dependently adjusted and mechanically connected to operate ...

Page 6: ...ism has been closed and latched by the hand closing jack and it is desired to open it in the same way hold up on the trip armature while backing off the jack so that the latch will be released otherwise the latch will hold the mechan ism closed Avoid letting the jack part way out be fore releasing the latch as the blow may break the bearing in the jack Always make certain that the jack is removed ...

Page 7: ...ARM VALVE CLOSED 0 FOR L P SPEED X LOW PRESS HEATER _ _Y CUTOUT SW I NOTE HEATERS ARE SHOWN 1 CONNECTED FOR 230 V _j I FOR 115 v SEE DETAIL ___j HI H2 1 1 1 1 1 1 I 17 1 1 OR H R HS NOTES BKR AUX SWS SHOWN FOR OPEN BKR RELAY CONTACTS SHOWN FOR DEENERGIZED RELAY PRESSURE CONTACTS SHOWN FOR OPERATING PRESSURE OPEN CONT OR AUX SW CLOSED CONT OR AUX SW FIG 3 Schematic Wiring Diagram 6cOIL OF DEVICE I ...

Page 8: ...time the automatic intake valve piston opens some small ports in its cylinder wall allowing the air in the main cylinder to exhaust to atmosphere Simple Opening Starting with the mechanism in the closed position when the control switch on the switchboard is turned to the trip position see Fig 3 the trip coil is energized through the two auxiliary switch a contacts As the trip plunger snaps upward ...

Page 9: ... and the full force of the air is available to stop the breaker in its opening stroke and return it to the closed position The speed of breaker reclosing is determined primarily by the point in the opening stroke at which the air is ad mitted This is controlled by the b contact special contact on 2 pole auxiliary switch see diagram Fig 4 which energizes the magnetic pilot valve The sliding station...

Page 10: ...ng an additional washer under each side of the spring mounting block The castle nut on the stud through the springs is for assembly only and should be backed out and locked far enough to allow spring pressure on the latch in either position should be 5 64 6 64 as indicated on Fig 1 and may be adjusted by screwing the trigger stop in or out With the jack just snug and ready to take the load check t...

Page 11: ...ts will require an adjustment on the screw on the top of the slotted link It is best to make these adjustments when the breaker is open in order to make sure that the pin on the main lever is not jammed in the top of the slot Do not change throttle adjustments unless there is some good reason for doing so Opening the throttle wider for faster closing operation will abuse the breaker unnecessarily ...

Page 12: ...t should be investi gated If the mechanism overtravels when the air is applied in this manner it is a reasonably good 12 indication that the leaks are not excessive These leaks are present only when the mechanism oper ates the air is sealed off positively by the intake valve at all other times The throttle piston should be inspected for free operation It is returned to its restricting position by ...

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