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ISt3699- 1966

Indian StandardSPECIFICATION FOR

FITTINGS AND ACCESS-ORIES FORPOWER TRANSFORMERS

Transformers Sectional Committee, ETDC 16

Chairman

SHRI U. K. PATWAI~~~IAN

Representing

In personal capacity ( Prayog El cclri cols Pri vate Ltd,Bombay )

M embers

SHRI T. V. BALAIC~ISHNAN Heavy Electricals ( India ) Ltd, BhopalSRRI A. K. KHOSLA ( Alfcrnatc )

SERI D. P. BA~AVARAJ Government Electric Factory, BangaloreSRRI V. SRINIVASA RAO ( Allcrnafc

SERI R. F. BECK National Electrical Industries Ltd, BombaySHHI UDHAM SINOH ( Alternate )

SHRI A. N. BHAR~AVA Uttar Pradesh State Electricity Board, LucknowSHRI P. K. BHAHUCHA Insurance Association of India, Bombay

SHRI A. C. MODY ( Alternate )SERI L. W.BRAZEL Calcutta Electric Supply Corporation Ltd, Calcutta

SRRI K. K. BOSE ( Alternate )SERI H. G. R. CHAKRAVARTHY

SRRI P. B. PAPALKAR (Maharashtra State Electricity Boa.rd, Bombay

Alternrlc )

SHRI HARQOBIND DEWAN Punjab State Electricity Board, PatialaSRRI J . R. HANDA Delhi Electric Supply Undertaking, Delhi

SRRI S. C. VARSHNAYA ( Altehatr)SERI L. C. J AIN

Strnr A. N. SINQR ( Alfcmafa )Central Water & Power Commission ( Power Wing)

SHRI S. S. KAKAD~: NGEF Ltd, BangaloreSH~I F. K. MENZLIN ( Alternate )

SS~RI P. T. MATTHEW Siemens Engineering & Manufacturing Co of IndiaLtd. Bombay

SRRI S. N. KAMAT ( Altcrnatr )SHRI D. B. MEHTA Tata Hydro-Electric Power Supply Co Ltd, Bombay

SRRI A. M. SARAN~ ( Allernale )SARI T. C. MOHAPATRA Orissa State Electricity-Board, Bhubaneshwar

SERI S. P. R. TATA (Alternate )

SHRI A. S. NA~A~KATTI Ditectorate General of Supplies & Disposals (I nspec-tion Wing ) ( Ministry of Supply & TechnicalDevelopment )

SERI S. K. MUHTHI ( Alf~r~la)

Contin ued on pap 2 )

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARO

NEW DELHI 110002

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lsr3639-1966

Indian Standard

SPECIFICATION FOR

FITTINGS AND ACCESSQRIESPOWER TRANSFORMERS

0. F-OREWORD

FOR

0.1 This Indian Standard was adopted by the Indian Standards Institu-tion on 7 July 1966, after the draft finalized by the TransformersSectional Committee had been approved by the Electrotechnical Division

Council.0.2 The need to standardize accessories and fittings for transformers wasfelt to facilitate interchangeability, and to rationalize use of fittings such aswould be commonly acceptable to manufacturers and users.

0.3 The re~quirements of the various Electricity Boards for different rat-ings of transformers have been kept in mind while preparing thisstandard.

0.4 All pipe threads shall correspond to IS : 554-1964* and all metricthreads to IS : 1362-1962t.

0.5 For the purpose of deciding whether a particular requirement of thisPtandard is complied with, the final value, observed or calculated, express-ing the result of a test, shall be rounded off in accordance with IS : 2-1960:The number of significant places retained in the rounded off value shouldbe the same as that of the specified value in this standard.

1. SCOPE

1.1 This specification covers the following accessories for use with trans-formers covered by IS : 1180-1964) and IS : 2026-196211.

a) Valves and valve flanges,b) Flanges for Bucholz relay,

*Dimensions for pipe threads for gas list tubes and pressure tight screwed fittings( rcvisrd I*

tJIimen&ns fnr screw threads for general purposes (diameter range I.6 to 39 m m )n u i s r d ). S i n c e wltharawn 1.

Rules for ~~unurog off numerical values ( revised).Spccification for outdoor type three-phase distribution transformers up to and in&d

ing 100 kVA 11 kV ( revised ).&ccification for power transformers.

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c) Breather pipe,d) Thermometer pockets,

e) Level indicator,

f) Rollers, and

g) Earthing terminals.

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definition in additionto those given in IS 2026-1962*, shall apply.

2.1 Flange -X flat mild steel plate of specified thickness, drilled suitably,to fit matching p.irt of the accessory with bolts and nuts.

3. VALVES AND VALVE FLANGES

3.1 When filter valves and drain valves are required, they shall be of sizesgiven in Table 1.

3.2 Valve flanges used shall be of sizes given in Table 2 (see also Fig. 1 ).

TABLE 1 RECOMMENDED SIZES OF VALVES

( Cfansc 3.1 )

TIIANSFORJIIR CAPACITYkVA

-hl------_?Over up to and

Including

(1) (2)

100

100 1600

1600 10 000

10000 40 00040 000 -

*SIZEOF DRAINVALVE

(3) f4lmm ntm

20 32

32 32

50 32

P,O 50

100 50

*SIZE OF FILTERVALVE

Sizes denote the nominal pipe bores and are in accordance with IS: 1239-1964 S ecification for mild steel tubes and tubulars ( re xf ) . [Since bifurcated and issuedas e S : 1239 Specification for mild steel tubes, tubulars and other wrought steel fittings

( Part I )-I968 Mild steel tubes ( second ev i sio n Si nce revised ), and( Part II )-1969 Mild steel tubulars and other wrought steel pipe fittings second

w isio?t) ]

*Specification for power transformers.

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IS 3639 - lm

*NOXTNALPIPEBORE

TABLE 2 VALVE FLANGES

Clause .2 )

DIAXETER 01 DIAMETEROP NU~~BERO~FQANGE BOLTCIRCLE BOLTS

D d

(2) (3) (4)mm mm

1:: ;.: :115 85 4120 90 4

135 4150165 4185 145 4215 180 4

tSlZE~OB FIAXOEBOLTS THICKNESS

T

5) 6)

mm

Ml2 10Ml2Ml2 f:Ml2

h 2 2Ml6 16Ml6 16Ml6 16Ml6 20

*Nominal pipe bores arc aclordance with IS.: 1239-1964 Spcciliration for mild steeltubes and tubulars ( r cd f( Since bifurcated ).

tBolt sizes are in accordance with IS: 1363-1960 S pccification for black hexagonalbolts ( 6 to 39 mm ) with nuts and black hexagonal screws ( 6 to 24 mm )(Since rev&d).

Material : Mild steel.

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6. THREADS FOR VALVES AND PIPES6.1 All threads for valves and pipes shall be in accordance withIS : 554-1964*. Thread sizes to be used for various sizes of valves andpipes shall be as follows:

VALVESIZE THBEAD SIZEmN~~~~~~P~~~ BORE

mm

::P4

25 p

zP 14P 1+

2: : &80 P3

100 P4

7. THERMOMETER POCKETS61 Thermometer pockets for mercurry-in-glass thermometer as shown in

rig. 3 shall be welded to the tank cover for a transformer with conservatoror on the side of the tank for a transformer without conservator.

7.2 Where dial ~thermometers are required, they shall be in accordancewith Table 3.

TABLE 3 SIZE OF DIAL THERMOMETERS

RATINQO~TTRANBBORMER, Smsor TEERMOMETER

kVAUp to and including 1600 100 mm dial

Above 1600 150 mm dial

8. FLUID LEVEL INDICATOR8.1 Where dial type fluid level indicator is specified, the recommendedsize is 150 mm.

9. ROLLERS

9.1 It is recommended that flat tread rollers on the basis of weight oftransformers be selected from Fig. 4.

10. EARTHING TERMINALS10.1 Earthing terminals shall consist of bolts of size either Ml2 or M20as given in IS : 1363-1960t.

Di~enaiona or pipe threads for gas list tubes and prcssurc tight screwed fittings( r8vised ) .

+Specification or black hexagonal bolts ( 6 to 39 mm ) with nuts and black hexagonalscrews (6 to 24 mm ) ce revised).

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Is t 3639 - 1966

Pi THREADS

TANK COVER

LizL_

_-rt

Thread Size is according to IS : 554-1964 Dimensions for pipe threadskr gas list tubes and pressure tight screwed fittings ( sad ).

All dimensions in millimetres.

FIG. 3 THERMOMETER OCKET OR MERCURY-IN-GLASS HERMOMETER

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D gMth dt b d, da d d, 1 r s1 s, s,

Roller 100 100 40 21 45 130 85 50 6 10 15 20

I&r 150 150 50 32 65 180 115 60 6 10 15 10

Roller200 200 80 50 -95 230 160 90 6 15 15 15

NOTB 1 - Rollera type 100,150 and 200 have only 4 apoker

NOTE 2 - The rollers are designated corresponding to the dimension dl.NOTE ~3 A plain roller can be made by cutting away flange rim.NOTE 4-The material for rollen 100, 150 and 200 ahall be grade 25 cast iron npe&

fied in IS: 210-1962 Specification for grcy iron castinga (r&d)with a load of4 toxm~ per roller.

NOTB 5 -Special type rollera may be required for sizer, larger than roller 200 dfor loads in coca of 4 tonnes per roller.

All dimensions in millimetrcs.

Fro. 4 CAST IRON ROLLERS

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BUREAU QF INDIAN STANDARDS

Headquarters :Manak Bhavan. 9 Bahadur Shah Zafar Marg. NEW DELHI 110002

Telephones : 3 31 01 31.3 31 13 75 Telegrams : Manaksaflstha( Common to all Offices 1

Regional Offices : Telephone

*Western : Manakalaya. E9 MIX. Marol. Andheri ( East ). 6 32 92 95BOMBAY 400093

tEastern : l/14 C. I. T. Scheme VII M, V. I. P. Road,Maniktola, CALCUTTA 700054

Northern : SC0 445-446, Sector 35-CCHANDIGARH 160036

Southern : C. I. T. Campus, MADRAS 600113

Branch Offices :

36 24 99

{2 18 4331641

(41 2442{[44: 229:;

Pushpak, Nurmohamed Shaikh Marg, Khanpur,AHMADABAD 380001

F Block, nity Bldg, Narasimharaja Square,BANGALORE 560002

C2 63 482 63 49

22 48 05

Gangctri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar. 6 27 16BHOPAL 462003

Plot No. 82,83, Lewis Road, BHUBANESHWAR 751002 5 36 275335 Ward No. 29, R. G. Barua Road.

5th Byeiane, GUWAHATI 781003-

5-8-56C L. N. Gupta Marg, (Nampatly Station Road) I 22 10 83HYDERABAD 500001

R14 Yudhister Marg, C Scheme, JAIPUR 302005 I6 34 71169832

11714188 Sarvodaya Nagar. KANPUR 208005

Patliputra Industrial Estate, PATNA 800013

Hantex Bldy ( 2nd Floor ). Rly Station Road.TRIVANDRUM 695001

{21 68 7621 82 92

6 23 05

52 27

inspection Office With Sale Point ):

Institution of Engineers ( India) Building, 1332 Shivaji Nagar, 5 24 35PUNE 410005

*Sales Ofhc e n Bombay is at Novelty Chamber& Grant Road,Bombay 400007

89 65 28

tSalas Office in Calcutta is at 5 Chowringhee Approach, P. 0. Princrp 27 68 00S1ree1, CalttHta 700072

Reprography Unit, BIS, New Delhi, India


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