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GE AB Series, Инструкция по эксплуатации

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r 

numbers.  For  such  instruments,  the  connection  dia­
grams  in  this  book  may  be  followed  by  observing  the 
pictorial  positioning  of  the  terminals,  rather  than  the 

stud  markings. 

Warning: 

Care  must  be  exercised  in  handling  high 

tension  wires  when  installing  instruments  on  such 
circuits. 

POLARITY  MARKINGS  OF  TRANSFORMERS 

Transformers  of  present  manufacture  have  polarity 

markings  of  white  paint  or  markers, 

H 1 

for  primary 

and X1  for  secondary,  on  or  near the  proper  terminal. 
These markings  denote  the relative  polarity  and  facili­
tate  the  making  of  proper  connections  for  correct  di­
rection  of  deflection  of  instruments.  The  relation  of 
the  marked  leads  is  such  that  instantaneous  direction 
of the  current  in  them is  the  same;  namely,  toward  the 
transforrr.er  in  the  marked  primary  lead  and  from  the 
transformer  in  the  marked  secondary  lead,  or  vice 

versa.  These  polarity  markings  are  indicated  in  the 

connection  diagrams  and  should  be  followed  irrespec­
tive  of  their  physical  location  on  the  transformers. 

GROUNDING  CASES  OF  A-C  INSTRUMENTS 

It 

is  frequently  desirable  to  use  transk>rmers  on 

circuits  of  over 

150 

volts.  The  cases  of  instruments 

which  are  used  with  current  and  potential  transform­

ers  should  be  connected  to  the  grounded  side  of  the 
secondary  circuits  of  such  transformers.  No. 

12 

Awg 

copper  wire  is  suitable  for  this  purpose. 

Grounding  connections  from  the  grounded  side  of 

the  secondary  circuits  to  earth  should  be  made  in 

accordance  with  the  provisions  of the  National  Electric 

Code. 

FRONT 

MOUNTING 

I" 

4-28THD. 

SIDE 

STUD 

Installation  GEH-15398 

PRINCIPLES  OF  OPERATION 

The  d-e  instruments  utilize  a  permanent-magnet, 

moving-coil  mechanism  adapted  for  the  longscale  in­
strument  design.  Current  passing  through  the  mov­
ing  coil  produces  a  magnetic  field  which  interacts 
with  the  field  produced  by  the  permanent  magnet, 
thus  supplying  the  deflecting  torque. 

The  moving 

system  deflects  until  counterbalanced  by  the  instru­
ment  control  springs. 

The  a-c  instruments  (except  expanded-scale  volt­

meters)  employ  a  moving  iron  mechanism  of  the  at­
traction-repulsion  type.  In  these  instruments,  three 
soft-iron  strips  of  carefully  determined  configuration 

are  mounted  inside  the  field  coil. 

When  this  coil  is  energized,  it  magnetizes  the  three 

iron  strips  and  also  a  vane  attached  to  the  pivoted 
shaft.  The  center  iron  strip  exerts  a  force  of  repul­
sion,  and  the  other  two  strips  a  force  of  attraction, 
on  the moving  vane,  in such a  manner  that  the  pointer 
moves  upscale  until  the  torque  is  counterbalanced  by 

the  instrument  control  spring. 

The  expanded-scale,  a-c  voltmeters  utilize  a  stand­

ard  electrodynamometer  mechanism  with  a  saturable 
reactor  placed  in  series  with  the  moving  coil. 

The 

moving-coil  circuit  is  connected  in  parallel  with  a 
circuit  consisting  of  the  field  and  frequency  compen­
sating  network. 

When  the  voltage  source  is  applied  across  the  satur­

able  reactor, the  exciting  current  varies  in  a  nonlinear 
fashion  with  the  voltage.  The  scale  distribution  cor­
responds  to  this  nonlinear  variation,  and  the  instru­

ment  produces  an  accurate,  readable  indication  in  the 
area  of  the  reference  voltage. 

BACK 

TERMINALS 

8 

31" 

DtA-

32 

Fig. 

3.  Dimensions  of  Types  DB-12  and  -13  ammeters  with  rheostat  for  lead-length  compensation. 

5 

www . ElectricalPartManuals 

. com 

www 

. ElectricalPartManuals 

. com 

Содержание AB Series

Страница 1: ...RUCTIONS GEH 15398 Supmedes GEH 1539A TYPES AB AND DB AMMETERS AND VOLTMETERS 150 GENERAL ELECTRIC 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 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 ...

Страница 2: ...nd DB 10 ammeters and voltmeters and DB 10 ground dete ctors PANEL SIDE MOUNTING STUD f 28 THO BACK 3 32 t PRESENT ON VOLTMETERS ONLY GROUNDING STUD 6 40 TAP FIG 2 DIMENSIONS OF TYPES AB 12 AND 13 AND TYPES D B 12 MID 3 AMMETERS VOLTMETERS AND GROUND DETECTORS STUD INSTRUMENT LOCATION D e Ammeters CD D c Voltmeters AB D e Ground Detector CD A c Ammeters AB A c Voltmeters AB 3 3 3 4 4 3 DIA 1 32 NO...

Страница 3: ...ment nameplate A C VOLTMETERS When the circuit exceeds 750 volts a potential transformer of the ratio indicated on the instrument nameplate must be used The transformer must have a frequency rating which corresponds to that on the instrument nameplate An external Form 3 resistor must be used when so indicated on the instrument nameplate The table below gives the number of tubes in the resistor sup...

Страница 4: ...er across the shunt end of the leads shunt disconnected and the instrument across the opposite end Apply a low adjustable d e voltage across the shunt end of the leads and adjust this voltage until the indication on the standard millivoltmeter agrees with the full 4 scale millivolts marked FULL SCALE MV on the instrument nameplate Loosen the lock nut located under the nameplate and turn the rheost...

Страница 5: ...PERATION The d e instruments utilize a permanent magnet moving coil mechanism adapted for the longscale in strument design Current passing through the mov ing coil produces a magnetic field which interacts with the field produced by the permanent magnet thus supplying the deflecting torque The moving system deflects until counterbalanced by the instru ment control springs The a c instruments excep...

Страница 6: ...NT LOCATION X y D e Ammeters CD 3 9 16 2 31 32 D e Voltmeters AB 3 9 16 2 31 32 D e Ground Detector CD 3 9 16 2 31 32 A c Ammeters AB 4 15 32 3 7 8 A c Voltmeters AB 4 15 32 3 7 8 A c Voltmeters expanded scale AB 5 29 32 5 5 16 Fig 4 D1mens1ons of Types AB 1 4 1 5 and 19 and Types DB 1 4 15 and 1 9 ammeters and voltme ters and g round dete ctors FRONT SIDE MOUNTING PANEL STUD f zs THO 1 c I I 15 1...

Страница 7: ... BELOW FRONT STUD DIMENSIONS INSTRUMENT LOCATION X y D e Ammeter CD 3 5 16 2 27 32 D e Vo tm ter AB 3 5 16 2 27 32 D e Ground Detector CD 3 5l16 2 27 32 A c Ammeter AB 4 7 32 3 3 4 A c Ammeter double rated AB EF 4 7 32 3 3 4 A c Voltmeter AB 4 7 32 3 3 4 A c Voltmeter expanded scale AB 5 21 32 3 3 16 Fig 6 Dimensions of Types AB 16 and DB 16 ammeters voltmeters and ground detectors SIDf BAC 1 f l ...

Страница 8: ...oltmeter AB 3 11 32 2 31 32 D e Ground Detector CD 3 11 32 2 31 32 A c Ammeter AB 4 1 4 3 7 8 A c Ammeter double rated AB EF 4 1 4 3 7 8 A c Voltmeter AB 4 1 4 3 7 8 A c Voltmeter expanded scale AB s 11 16 S S 16 Fig 8 Dimensions of Types AB 18 and DB 18 ammeters voltmeters and ground detectors FRON T SIDE 9 1 6 L 1 NAMEPLATE RHEOSTAT 332 32 USE AS GROUNDING STUD IN ACCORDANCE WITH EXTERNAL CONNEC...

Страница 9: ...th external shunt SOURCE FUSES Fig 18 D e voltmeter ra ted above 750 volts with external resistor SOURCE LOW HIGH LOAD Fig 15 Low range on double rated d e ammeter FUSES L 0 AO Fig 19 Double rated d e voltmete r illustrating use of swit ch to sele ct range SOURCE Fig 16 High range on double rated d e ammeter SOURCE F SES LOAD Fig 19a D e ground de te ctor for voltages up to and in cluding 750 volt...

Страница 10: ...OURCE Fig 24 High range an double rate d a c ammete r SOURCE LOAD Fig 27 A c v o Itm e t e r Types AB 10 12 and 1 3 only with potential tran s former SOURCE Fig 22 A c a m m e t e r Types AB 14 15 16 1 8 and 19 only with current transformer SOURCE FUSES I LOAD Fiy 25 Self contained a voltmete r SOURCE FUSES H1 X1 sn LOAD Fig 28 A c v o It m e t e r Types AB 14 15 16 18 and 19 only with poten tial ...

Страница 11: ...i 3 8000 c 15 6 13 10 1g 6 A2 3 i 3 10000 c 17X 8 15 i 12 5 3 J l 1 v 2 2 2 3 Y Y K J i J i J i A A 2 3 i l 1 l 1 Jl 2 L J i J i J i A A 3 i l1 23 12 v X X u u u u I Connection Stripe Each End 1 1 1 I I I I 1 1 I 1 2 2 3 3 4 4 5 5 5 7 7 For current values above 10 000 amp the best arrangement is to use two or more shunts in parallel with a separate set of leads for each shunt The Form 15 shunts fo...

Страница 12: ...Ore Cascade B dg 1170 Pearl St Evansville 19 Ind 123 N W Fourth St Fairmont W Yo 310 Jacobs Bldg P O Box 1626 Fergus Falls Minn I 08N Court Ave P O Box 197 Flint 3 Mich 653 S Saginaw St Fort Wayne 6 Ind 3606 So Calhoun St Fort Worth 2 Tex 408 W Seventh St Fort Worth Tex Fresno 1 Calif Grand Rapids 2 Mich Greensboro N C Greenville S C Gulfport Miss Hagerstown Md Hartford 5 Conn Houston 1 Te x os In...

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