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I.L. 

41-923.2 

INSTALLATION 

• 

OPERATION 

• 

MAINTENANCE 

INSTRUCTIONS 

TYPE  K.A  CARRIER .AUXILIARY  RELAY 

CAUTION 

Before  putting  relays  into  service,  remove 

all  blocking  which  may  have  been  inserted  for  the 

purpose  of  securing  the  parts  during  shipment,  make 
sure  that  all, moving  parts  operate  freely,  inspect  the 

contacts  to  see  that  they  are  clean  and  close  proper­
ly,  and  operate  the  relay  to  check  the  settings  and 
electrical  connections. 

A P PL ICAT ION 

The  type 

KA 

relay  is  an  auxiliary  relay  u sed  in 

the  distance  carrier  relaying  scheme  to  block  or 
prevent  instantaneous  tripping  for  faults  external  to 
the  line  section  to  which  it  is  applied,  and  to  permit 
instantaneous 

simultaneous 

tripping  for  internal 

faults. 

The  relay  is  arranged  to  respond  to  indica­

tions  of  fault  power  and  direction  provided  by  the 
phase  and  ground  relays,  thereby  controlling  the trans­

mission  of  the  carrier  signals. 

CONSTRUCT ION  AND  O PERAT ION 

The  type 

KA 

relay  consists  of  directional  auxili­

ary  units,  receiver  and  alarm  units,  and  a  phase  fault 
carrier  operation  indicator.  In  addition,  the  type 

KA 

relay  contains  a  hi�h  speed  overcurrent  unit  used  to 
start  carrier  transmission  for  ground  faults.  The  con­
struction  and  operation  of  the  relay  units  are  de­
scribed  below.  Complete  details  of  the  operation  of 

this  relay  in  the  distance  carrier  relaying  scheme  is 
described  in  I.L. 

41-911. 

Overcurrent  Unit 

The  overcurrent  unit  is  a  product  induction  cyl­

inder  type  unit. 

The  time  phase  relationship  of  the 

two  air  gap  fluxes  necessary  for  the  development  of 
torque  is  achieved  by  means  of  a  capacitor  connected 
in  series  with  one  pair  of  pole  windings. 

Mechanically,  the  overcurrent  unit  is  composed  of 

fotr  basic  components:  a  die-cast  aluminum  frame, 

an 

electromagnet,  a  moving  element  assembly,  and  a 

molded  bridge. 

The  frame  serves  as  the  mounting  structure  for 

the  magnetic  core.  The  magnetic  core  which  houses 

NEW  INFORMAT ION 

the  lower  pin  bearing  is  secured  to  the  frame  by  a 

locking  nut.  The  bearing  can  be  replaced, 

if 

neces­

sary,  without  having  to  remove  the  magnetic  core 
from  the  frame. 

The  electromagnet  has  two  pairs  of  coils. 

The 

coils  of  each  pair  are  mounted  diametrically  opposite 
one  another.  In  addition,  there  are  two  locating  pins. 

The  locating  pins  are  used  to  accurately  position  the 
lower  pin  bearing,  which  is  mounted  on  the  frame, 

with  respect  to  the  upper  pin  bearing,  which  is 
threaded  into  the  bridge. 

The  electromagnet  is  se­

cured  to  the  frame  by  four  mounting  screws. 

The  moving  element  assembly  consists  of  a 

spiral 

spring,  contact  carrying  member, 

and  an 

aluminum  cylinder  assembled  to  a  molded  hub  which 

holds  the  shaft. 

The  shaft  has  removable  top  and 

bottom  jewel  bearings.  The  shaft  rides  between  the 
bottom  pin  bearing  and  the  upper  pin  bearing  with  the 

cylinder  rotating  in  an  air  gap  formed  by  the  electro­
magnet  and  the  magnetic  core. 

The  bridge  is  secured  to  the  electromagnet  and 

frame  by  two  mounting  screws.  In  addition  to  holding 
the  upper  pin  bearing,  the  bridge 

is 

used  for  mounting 

the  adjustable  stationary  contact  housing. 

The 

stationary  contact  housing  is  held  in  position  by  a 

spring  type  clamp.  The  spring  adjuster  is  located  on 

the  underside  of  the  bridge  and  is  attached  to  the 
moving  contact  arm  by  a  spiral  spring. 

The  spring 

adjuster  is  also  held  in  place  by  a  spring  type  clamp. 

With  the  contacts  closed,  the  electrical  connec­

tion  is  made  through  the  stationary  contact  housing 

clamp,  to  the  moving  contact,  through  the  spiral 

spring  out  to  the  spring  adjuster  clamp. 

When  the  current  in  the  overcurrent  unit  exceeds 

the  pick-up  value  the  contacts  open,  allowing  positive 

potential  to  be  applied  to  the  carrier  transmitter. 

transformer  and  varistor  assembly  is  used  in 

conjunction  with  the  overcurrent  unit. 

The  trans­

former  is  of  the  sati.D'ating  type  which  limits  the 
energy  to  the  overcment  unit  and  reduces  the  burden 

EFFECT IVE  NOVEMBER 

1959 

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Summary of Contents for 41-923.2

Page 1: ...agnetic core which houses NEW INFORMATION the lower pin bearing is secured to the frame by a locking nut The bearing can be replaced if neces sary without having to remove the magnetic core from the f...

Page 2: ...1 OVERCURRENT UNIT TAP BLOCK RRP CONTACT RRG CONTACT POLAR UNIT ALARM RELAY Al CARRIER START CONTACT los CARRIER START OVERCURRENT UNIT los SPARE TAP SCREW POLAR UNIT RECEIVER RELAY CSP AUXILIARY SWIT...

Page 3: ...36 32 28 ii 24 20 15 ii C 12 u c C u 0 0 10 12 14 II 18 20 MULTIPLES or PICKUP CURREIT or CARRIER START OYERCURREIT um Curve 471o61 Fig 3 Typical Time Characteristics of carrier start over current un...

Page 4: ...zed by a single coil and operates a single set of contacts The coil is energized by the received carrier to close the contacts and give an alarm This element has a higher pick up than that of the rece...

Page 5: ...nuts on the stud and then turning the proper nut with a wrench The carrier relaying schematic supplied with the carrier order should be consulted for details of the external connections of these relay...

Page 6: ...spring is adjusted by placing 6 a screwdriver or similar tool into one of the notches located on the periphery of the spring adjuster and rotating it The spring adjuster is located on the underside o...

Page 7: ...screw affect the adjustment on the other shunt screw Polar Alarm Unit The contacts should close with 8 milliamperes d e 5 applied to the alarm coil Adjust the contact screws to obtain an 050 contact...

Page 8: ...p Value Current Angle at 5 amperes Angle 5 37 3 9 24 4ff 75 38 36 13 37 5 2 1 39 35 8 5 34 1 25 41 34 6 0 32 1 5 43 32 4 6 31 2 45 30 2 9 28 1 41 36 9 0 36 1 5 44 32 5 0 32 1 4 2 47 30 3 0 29 2 5 50 2...

Page 9: ...L USE 2 18 STUD 16 190 3ZSCREW FOR THICK PANEL USii 190 32 STUD TERMINAL ND 1 0U NTING DETAILS NOTE ALL DIMEN 01 1 It INCHE TERMII lAL PANEL CUtOUT DRILLIN q FOR SEMI FLVSH MTG P NEL DRILL NC OR C UTO...

Page 10: ...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 11: ...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 12: ...WESTINGHOUSE ELECTRIC CORPORATION RELAY DEPARTMENT NEWARK N J 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 13: ...ch houses SUPERSEDES I L 41 923 2 Denotes change from superseded issue the lower pin bearing is secured to the frame by a locking nut The bearing can be replaced if neces sary without having to remove...

Page 14: ...ERCURRENT UNIT TAP BLOCK RRP CONTACT RRG CONTACT POLAR UNIT ALARM RELAY AL CARRIER START CONTACT los CARRIER START OVERCURRENT UNIT los SPARE TAP SCREW POLAR UNIT RECEIVER RELAY CSP AUXILIARY SWITCH F...

Page 15: ...chematic The operation of 40 36 32 28 3 iii 24 20 16 ii 12 4 0 0 10 12 14 18 18 20 MULTIPLES OF PICKUP CURREIT OF CARRIER START OYERCURREIT URIT Curve 47lo61 Fig 3 Typical Time Characteristics of carr...

Page 16: ...cator The operation indicator gives a visual indication of a carrier tripping operation for phase faults by the distance relay through the RRP contacts For a ground fault carrier relaying operation th...

Page 17: ...ts on the stud and then turning the proper nut with a wrench The carrier relaying schematic supplied with the carrier order should be consulted for details of the external connections of these relays...

Page 18: ...he spring is adjusted by placing 6 a screwdriver or similar tool into one of the notches located on the periphery of the spring adjuster and rotating it The spring adjuster is located on the underside...

Page 19: ...t screw affect the adjustment on the other shunt screw Polar Alarm Unit The contacts should close with 8 milliamperes d e 5 applied to the alarm coil Adjust the contact screws to obtain an 050 contact...

Page 20: ...p Value Current Angle at 5 amperes Angle 5 37 39 24 4ff 75 38 36 13 37 5 2 1 39 35 8 5 34 1 25 41 34 6 0 32 1 5 43 32 4 6 31 2 45 30 2 9 28 1 41 36 9 0 36 1 5 44 32 5 0 32 1 4 2 47 30 3 0 29 2 5 50 28...

Page 21: ...N t L USE 2 18 STUD 16 190 32 s c Rr w FOR THIC K PANEL US 190 32 STUD TERMINAL O ND MOU NTING DETPIIL5 NOTE A LL DIMENS OW i It t INC E Icc ll PANEL CUtOUT DRILLING FOR SEMI FLUSH Ml j f lo NE DRILL...

Page 22: ...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 23: ...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 24: ...WESTINGHOUSE ELECTRIC CORPORATION RELAY DEPARTMENT NEWARK N J 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...

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