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Westinghouse DK-25 Manual

Air circuit breaker, 3-pole, 600-ampere, 600-volt a-c, 250-volt d-c
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TYPE DK-25 AIR CIRCUIT BREAKER
Frontispiece
3-Polef 600-Ampere1 600-Volt A-C.1 250-Volt D-C. Breaker
&
Westinghouse Electric
Manufacturing Company
U.S.A.
East Pittsburgh/ Pa.
5965
I. B.
Printed in
ll-41

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Summary of Contents for Westinghouse DK-25

  • Page 1 TYPE DK-25 AIR CIRCUIT BREAKER Frontispiece 3-Polef 600-Ampere1 600-Volt A-C.1 250-Volt D-C. Breaker & Westinghouse Electric Manufacturing Company U.S.A. East Pittsburgh/ Pa. 5965 I. B. Printed in ll-41...
  • Page 2 Type DK Air Circuit Breaker Preface It would be difficult to over-emphasize the importance of care of all protective devices. To assure proper , they should be the sub- ject of periodical,systematic and intelligent inspec­ tion. Even the smallest details of required mainten­ ance should not be neglected if costly failures...
  • Page 3 Type DK Air Circuit Breaker General air circuit breaker, complete with all attachments, is a self-contained unit, and has been mounted, adjusted and calibrated on its It is designed only to be mounted in a own permanent panel at the factory. vertical position, and all inspections for proper...
  • Page 4 Type DK Air Circuit Breaker Replacement of Contacts The sub-panel, barrier and "Do-ion" interrupting assembly may be removed as a unit by taking out two bolts at the outer ends of the sub-panel. This gives access to the contacts for easy ction or replacement.
  • Page 5 Type DK Air Circuit Breaker Drawing 4-D-2515 shows the arrangement of adjustments on this tripping attachment, and curve 261560 represents the characteristic inverse time delay. The 100% calibration setting by the pointer on the scale plate is the normal rating of the trip unit, and that value of current will just trip the breaker with no oil in the pot.
  • Page 6 Type DK Air Circuit Breaker The closing motor is a single phase commutator type, vertical shaft motor with ball bearings sealed with lubricant �hat will normally last the life of the apparatus. A single reduction of speed between the motor shaft and the mechanism crank is accomplished with a worm mounted on the upper end of the motor shaft engaging a worm...
  • Page 7 Type DK Air Circuit Breaker The shunt trip is designed for intermittent duty. The tripping current must always be cut off by an auxiliary switch on the breaker. normal tripping currents for standard control voltages are: Tripping Current Voltage Rating Volt, A-c.
  • Page 9 DK Air Circuit Breaker DH'-2.5 AI� CIJ;.S/1'/i, ·600AMP. F'NAME · · )4D-'l/STMENiS WITH iHEII M AI.. · MAGNETIC OUAI.. OVE/ili.OAD T THIS N TO GIVE ADJU THE CLEA�ANC'& SHOWN BITWEEN CONTACTS MAIN THE AIIC TIPS JU5T ·WHEN SECIJ/II E. I.. Y TQIJCH.
  • Page 10 Type DK Air Circuit Breaker AI� CI�CIJIT S�EAK£/C Oil. SIJCKQ·MA6'N£TIC T!i?IP 01/ERLOAO CALIBRATIO N AMBIENT. • 1'1/077:$:- � C'AI.ISIIATIDN SETTINfi il-l£ ICC �A.L. 011' IS iH£ !IATINlf .,.H£ t:JV6'4'1.DAD A.,.TACHMENi. .,.HE Tll'IPPIM; liMES INDICATED TH£ SY .,.HE C'I.JIIVE'S A�£ MINIM LIM VAI.I.IU .,.H£...
  • Page 12 Type DK Air Circuit Breaker 4LlCT�ICN. I.Y• OP£1/lAriD WtTif Ata"!• PtiMfll !tEI.t4Y ----- - - - ----- --- -- ---� 81H: r.•.� 0PEICA710N !· CS-C CLO$ �$. CCN'f'�Ot.. 1}1) 1.1!1' PIC�$ Tl¥�01/61'1 Y CON1'AC,T, 2· MCiCil J• I.IMJ'f" sw. LS Ct.OSES �...
  • Page 17 TYPE DK-16 AND DK-26 AIR CIRCUIT BREAKER " Fig. 1-3-Pole, 600-Ampere, 600-Volt A - C., 250-Volt D-C. Breaker Instruction Book 5965-E Westinghouse Electric Corporation East Pittsburgh, Pa. PrintM in TT � A...
  • Page 18 Type DK-15 and DK-25 Air Circuit Breaker Preface It would be difficult to over-emphasize the importance of adequate care of all protective devices. To assure proper functioning, they should be the sub­ ject of periodical,systematic and intelligent inspec­ tion. Even the smallest details of required mainten­...
  • Page 19 Type DK-15 and DK-25 Air Circuit Breaker General The DK air circuit breaker, complete with all attachments, is a adjusted and calibrated on its self-contained unit, and has been mounted, own permanent panel at the factory. It is designed only to be mounted in a...
  • Page 20 Type DK-15 and DK-25 Air Circuit Breaker The moving arc tip can be removed by taking out the wire clip and nut on the threaded rod, removing two small screws that hold the secondary shunt to the main contact, and removing the arc tip pin.
  • Page 21 Type DK- 1 5 and DK-25 Air Circuit Breaker Characteristics of Thermal-Magnetic Dual Overload The general arrangement of this attachment is shown in Fig. with inverse time delay characteristics in Fig. 7. 100% calibration setting of the pointer on the scale...
  • Page 22 Type DK-15 and DK-25 Air Circuit Breaker The reechanism crank engages a hardened steel cam on the roller lever. The relative motion of the crank roller with respect to this surface is to produce the maximum mechanical advantage when the closing load is greatest.
  • Page 23 Type Breaker DK-15 DK-25 Air Circuit Undervoltage Tripping Attachment The undervoltage attachment i.s normally mounted on the main panel to the left of the breaker. It operates to trip the breaker through the trip bar if the control voltage drops...
  • Page 24 •...
  • Page 25 Type DK-15 and DK-25 Air Circuit Breaker .SKR. ·DC. BOOAMP.I"'R AME ·AC. DK-15 AIR CIR. • ADJUS7 MEN7.S W ITH OIL SI.JCH£11 DlJA/.. OVE R I.OAD ADJU.t'T TNI.t'.J'/lT BR6AK ER! t'AN I!IE TRIPPED ,I T H FORt:£ 111/Dt� CI'ITE.II , �DIID...
  • Page 26 Type DK-15 and DK-25 Air Circuit Breaker DK·26 AIR' C'I�SH'I2.·SOOA M P.I"/IAM£·AC.·DC. ADJUSTMENT$ WITH iHE/iMAJ.· MASNETIC 01/AL OVE�I.OAD PovND.r TRIP Po�E.r .DI</S" ZlK.2S .sro 1 .�ro 1 .7S'ro I.ZS 1-ro .7Sro/.I'.S trol.!f' .7;!1' n:>/.2!1' 1 ro/.5 NI.IT 11r P"INTI'/1 TIJ�N INIUI.ATID ANti DIII�ID...
  • Page 31 Type DK- 1 5 and DK- 2 5 Air Circuit Breaker AIR C!RCIJIT SR£ AK £ � SIJCK £ �- M AG N £T IC / ,tiJIP 01/ £�/.. 0 AO C ALIBR ATION ° AMBIENt. NOr E s:- 100% iH£...
  • Page 32 Type DK- 1 5 and DK-25 Air Circuit Breaker 4 : 00 ' 00 BREAKER S c 00 ' 00 AIB CIRCUIT Thermal Overload Trip Cal ibrat ion AMB. 24 ° C . The lOo,l> setting is the 1 1 00 ' 00...
  • Page 35 'Iter . qo . De s cription Auxiliary Swit ch Auxi liary Switch Lever Link Link Bracket Link Breaker Cen ter Po le Indicator A s s embly S pacer S# 898 756 �0 1 /4-20 x 3/4 Hexagon Head Steel Bolt �1 1/4 Standard Lock Washer 1/4-20 x 1/2 Hexagon Head Ste e l B o l t...
  • Page 37 Type DK- 1 5 and DK-25 Air Circuit Breaker " DK'A t R C I R C U I T "B R. EM < E R T Y P E E L E CTR I C A L LY O P E. R ATE. D...
  • Page 38 Type DK- 1 5 and DK -25 Air Circuit Breaker " @� � � � � 2 gt � � � ® gl� """' Cfj � i® Q� � � � � � + · , , }; � @§� �- •...
  • Page 39 Type DK- 1 5 and DK -2 5 Air Circuit Breaker 12 - Reverse Curren t Trip Fig . 8-D-2969 Drawing...
  • Page 41 Type DK- 1 5 and DK-25 Air Circuit Breaker De s cription • 2 ge S tud Adjustment with Cir. Bkr. in Cloud Position . djua t to Obtain A Switch of ..!. � ..L Seporotion ustmen t Bolt ·1 De t a i l s ·...
  • Page 45 TYPE DK-18 AND DK .. 2S AIR CIRCUIT BREAKER Fig. 1-3-Pole, 600 · Ampere, 600·Volt A- C., 250-Volt D-C. Breaker Instruction Book 5965-F Filing No. 35-000 Westinghouse Electric Corporation East Pittsburgh, Pa. Printed in U.S.A. (Rep. 9·50)
  • Page 46 Type DK-15 and DK-25 Air Circuit Breaker Preface It wou l d be difficul t to over -emphasize the importance of adequate care of a l l protect! ve devices . To assure proper fu nctioning , they shoul d be the sub­...
  • Page 47 Type DK- 1 5 and DK-25 Air Circuit Breaker General The DK air c ircuit breake r , c omple te with all a t t a chment s , i s a s e l f - c ontained unit ,...
  • Page 48 Type DK- 1 5 and DK-2 5 Air Circuit Breaker The moving arc tip can be removed by taking out the wire clip and nut on the threaded rod , removing two s mall s crews that hold the secondary shunt to the main contact, and removing the arc tip pin.
  • Page 49 Type DK- 1 5 DK-25 Air Circuit Breaker Characteristics of Thermal-Magnetic Dual Overload general arrangement of this attachment is shown in Fig . with inverse time delay characteristics in Fig . 7 . The 100 % calibration setting of the pointe r on the scale...
  • Page 50 Type Breaker DK- 1 5 and DK-25 Air Circuit The me chan i sm crank engag e s a hardened s t e e l on the r o l ler l e ver . The r e la t i ve mo t i on of the...
  • Page 51 Type DK- 1 5 and DK-25 Air Circuit Breaker Undervoltage Tripping Attachment The underv o l t age a t ta chment i s normal ly mounted on the main panel to the l ef t of the breake r .
  • Page 55 DK-15 Type :: f' De s c r ipt i on Shunt Trip Upp er Stud Lowe r Stud � Moving C ontac t A s s emb ly Mov ing C ontac t A s s emb ly C r os s Bar Le ver �...
  • Page 57 Typf De s c ript i on N o . Upper Stud Lowe r Stud Cr o s s Bar Shunt Mo ving C onta c t A s s embly Mo ving C onta c t A s s embly Cr o s s Bar Le ver Linkage A s s embly Roller Le ver...
  • Page 60 Type DK-1 5 and DK-2 5 Air Circuit Breaker .., ,.., ::;) ::lE � .., ::lE ,.., ;::: 30 " 30" 1 8 " 1 8 " 1 2 " 12" 6 " CU RRENT IN PERCENT F i g . The rma l O v e r l o ad 1 l ' r i p Ca l i b ra t ion 35 1052 Curve...
  • Page 65 DK- 1 5 DK-25 Type Air Circuit Breaker T Y P E ''DK ''A IR CIRC U t T "6 R EA K E R E L E CT R I C A L LY OPE R ATf. D DIA� RAM WIR IN G.
  • Page 66 Type DK- 1 5 and DK-ZS Air Circuit Breaker ..®� �� � \..t )... � � � � � � � � � � � ® M ...J <1 2� Cr) � � � � ® '{ ® � Q�...
  • Page 67 DK- 1 5 DK-25 Type Air Circuit Breaker Fig . 12 - R eve rs e Curren t Trip Drawing 8 -D -2969...
  • Page 68 Type DK- 1 5 and DK-25 Air Circuit Breaker ( t:Y.) /-41? Av� .Sill. U N DE I!YOt. r Atf£ ! H I P 0/Z Et. £CTA?IC /.O CK OVI T !?tP .SNui'Vr . Fit:;. � rtt;. (fi ll ) JeE V £' /lS£...
  • Page 69 Type DK- 1 5 and DK- 25 Air Circuit Breaker De s cr i ption •2 .e S tud Adjustment with Clr. Bkr. in Closed Position. djust to Obtoin A Switch ..!. ! ..L Seporotlon of ts tmen t B olt De t a i ls tinal Lock Washer...
  • Page 71 TYPE DK- 18 AND DK-28 AIR CIRCUIT BREAKER Fig. 1 -3-Pole, 600-Ampere, 600-Volt A· C., 250-Volt D-C. Breaker Instruction Book 5965-E Westinghouse Electric Corporation East Pittsburgh, Pa.
  • Page 72 Type DK- 1 5 and DK- 25 Air Circuit Breaker Preface It w ould be diffi cul t t o over-empha s i z e the impor tance of adequa te care of a l l pro t e c t ive de vi c e s . To a s sure proper func t i oning , they should be the sub ­...
  • Page 73 Type DK- 1 5 and DK- 2 5 Air Circuit Breaker Genera] The DK air circuit breake r , c omp le te with a l l a t tachment s , i s a s e l f - c ontained unit , and haa been mounted , ad jus ted and calibrated on i t a own permanent pane l a t the fa c tory .
  • Page 74 Type DK- 1 5 and DK-25 Air Circuit Breaker The moving ar c tip can b e r emoved by taking out the wire clip and nut on the thr eaded rod , removing two small s crews that hold the s e condary...
  • Page 75 DK- 1 5 DK-2 5 Type Breaker Air Circuit Characteristics of Thermal-Magnetic Dual Overload F i g . 3 The general arrangement of thi s attachment i s shown in 100% with invers e t ime de lay charac ter i s t i c s in Fi g . calibrat i on s e tt ing of the pointer on the s c a l e pla t e i s the normal rat ing of the trip...
  • Page 76 DK- 1 5 DK-25 Type Air Circuit Breaker The me chan i sm crank engag e s a hardene d s t e e l cam on the r o l l e r l ever . The relative m o t i on of the...
  • Page 77 Type DK- 1 5 and DK-2 5 Air Circuit Breaker Undervoltage Tripping Attachment The undervol tage attachment i s normal ly mounted on the main panel to the left of the breaker . It operates to trip the breaker through the trip bar if the c on trol voltag e drop s...
  • Page 80 Type DK-15 and DK-25 Air Circuit Breaker D/(·26 C'lte.Sif!C. ·600AM P.I" � AM£·AC.·.D.C AI� ADJlJSTM E NT S W IT H iHERMAL·MAGNET IC 01/AI.. OV E/1/.. 0A D ADJlJIT fiVE THIS N C J.& AII ANt:r $ HDW N BETWEEN MAIN CONT ACTS JUST WHEN TH&...
  • Page 81 Type DK- 1 5 and D Des c r ipt i on Shunt T r ip Upper St ud Lower S t ud M oving C onta c t A s s embly M o v ing C onta c t A s s embly C r os s Bar le ve r Linkage A s s emb ly R oller le ver...
  • Page 85 Type DK-15 and DK-25 Air Circuit Breaker Alii' C I �CI.Itr S�£ AK £ � T li'IP SI./Cff £ �- M A6 N £71C 01/ £' /C L.O AD C ALIBR ATION C. AMSI£Ni. ° IVOi E S:- . 100% C' ALIS�...
  • Page 86 Type DK- 1 5 and DK-25 Air Circuit Breaker 4 : 00 ' 00 BREAKER DK AIR S c 00 ' 00 CIRCUIT Thermal Overload Trip 2 : 00 ' 00 Calibra t i on AMB . 24 ° c .
  • Page 91 Type DK - 1 5 and DK -25 Air Circuit Breaker " DK' A I R T Y P E C I R C U I T B R E A K E R E L E CTR I C A L L Y OPE R ATf. D Wlf:�.
  • Page 93 DK- 1 5 DK-2 5 Type Air Circuit Breaker Fig . 12 - R evers e Current Tri p Drawing 8 -D-29 6 9...
  • Page 94 DK- 1 5 DK- 25 Type Air Circuit Breaker • /-4-1! AV.f .Sill. BEI.L IUIIRM CtJNrAt:T U NOE PYOJ. r Atf£ r ,e ; p r �' o� £l £CT�IC i.O C' K OUI SNo�Vr , rltf. � rtfi. 2 (F.

  • Page 95: Lock Washer

    Type DK- 1 5 and DK-25 Air Circuit Breaker Des cription 41 2 1ge stud Adjustment with Clr. Bkr. In Cloaed Po1ition. djust to Obtoln A S,.itch ..!. Seporutlon of 16 - !1 2 • :tde jus tmen t Bolt...

This manual is also suitable for:

Dk-15