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है”ह”ह

IS 15137 (2002): Metal Connecting Lugs for PorcelainTransformer Bushings [ETD 6: Electrical Insulators andAccessories]

Is 15137:2002

mm

Indian Standard

METAL CONNECTING LUGS FOR PORCELAINTRANSFORMER BUSHINGS — SPECIFICATION

May 2002

ICS 29.080.20; 29.120.99

0 BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 2

I

Electrical Insulator and Accessories Sectional Committee, ET 06

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the ElectricalInsulator and Accessories Sectional Committee had been approved by the Electrotechnical Division Council.

The need has been felt to bring out a common specification for connecting lugs [see IS 3347 (Parts 1 to 8)].This standard specifies such common requirements.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final valueobserved or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2:1960 ‘Rulesfor rounding off numerical values (revised)’. The number of significant places retained in the rounded off valueshould be the same as that of the specified value in this standard.

I

I

I

I

1,

Is 15137:2002

Indian Standard

METAL CONNECTING LUGS FOR PORCELAINTRANSFORMER BUSHINGS — SPECIFICATION

1 SCOPE

1.1 This standard covers the material and dimensionsof connecting lugs for porcelain transformer bushings.

1.2 The dimensions of stem for the transformerbushings have been covered separately in relevant partof IS 3347.

2 REFERENCES

The Indian Standards listed in Annex A are necessaryadjuncts to this standard.

3 CURRENT RATINGS

Standard current ratings of the connecting Iugscopper and aluminium stem shall be as follows:

for

Copper stem 800, 1000, 1250, 2000 and3 150A

Aluminium stem 400,630,800, 1250 and 2 000A

4 MATERIALS

The materials of the connecting lugs shall be:

a) For copper stem

1 000A) Brass to Grade 3 of IS 292

2 OOOA) or IS 6912

3 150A) Copper chromium alloy forginghaving the following character-istics:

1) Electrical conductivity at 20”C

2)

3)

Min 81 percent IACS (47 SiemensN/mmz);

Tensile strength 370 (N/mm2), Min; and

Brinnel hardness 5/250, Zklin 125 HB.

Chemical composition: Chromium 0.3 to 1.2 percent.Total impurities 0.3 percent and remainder copper.

NOTE — The tensile strength and elongation shall be determinedon the test bar in accordance with IS 1608.

b) For aluminium 1 OOOA)Aluminium alloystem 2 OOOA)shall have the

following proper-ties:

1) Electrical conductivity at 20”C– minimum43 percent IACS (25 Siemens mhnrd),

2) Tensile strength - minimum (300N-mmz), and

3) Brinell hardness 5/250 - minimum100 HB.

5 DIMENSIONS

The dimensions of the connecting lug shall be inaccordance with Table 1 (see Fig. 1).

6 TOLERANCES

Unless otherwise specified, allowable tolerances ondimensions of any machined metal parts shall be inaccordance with medium class of IS 2102 (Part 1).

7 SURFACE FINISH

The surface finish for connecting lug shall be electro-tinning according to IS 1359 subject to agreementbetween the manufacturer and the purchaser.

Table 1 Dimensions of the Connecting Lugs

(Clause 5.1 and Fig. 1)

*

Material Nominal D, Dz DM C G If,, If,, H,, S WN T P Q R R,R, H B LCurrentRating

Amp

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22)

Copper I 000 M30x2 14 M12 45 30 130 60 60 32 143025121015525 70 15Aluminium 630

Copper 2000 M42x3 )8 M16 58 40 195 80 60 32 254535201820525 100 20Aluminium 1000

Copper 3150 M48x3 18 M16 68 40 220 80 120 60 304535201820525 100 20Ahsminium 2000

NOTE — Dimensions H,, and H,f are as agreed to between the purchase, an i the supplier.

1

IS 15137:2002

URRED

L-CA “ B

t

w

ts

H,a

~Iw

N1O1

1

‘2 N1O

I t

SPRING \

+t--

WASHER

LSEE IS 3063

FORM AFORVERTICALTAKE OFF

FIG. 1 CONNECTINGLUGS— Continued

2

IS 15137:2002

SPRINGWASHERSEE IS 3063

—.— -—

,FORM B IFOR HORIZONTALTAKE OFF

FIG. 1 CONNECTINGLUGS— Concluded

8 ACCESSORIES

8.1 Hexagonal Nuts

The hexagonal nuts used shall conform to IS 1364(Part I) andIS3138. The thread shall be in accordancewith IS 4218.

8.2 Spring Washers

The spring washers used shall conform to dimensionsV1OOr V120f IS3063.

9 MARKING

9.1 The connecting lug shall be marked with thefollowing:

a) Name of the manufacturer, and

b) Current ratings.

9.2 BIS Certification Marking

The connecting lug may also be marked with theStandard Mark.

9.2.1 The use of the Standard Mark is governed bythe provisions of the Bureau of Indian StandardsAct, 1986 and the Rules and Regulations madethereunder. The Standard Mark on products coveredby an Indian Standard conveys the assurance that thehave been produced to comply with the requirementsof that standard under a well defined system ofinspection, testing and quality control which is devisedand supervised by BIS and operated by the producer.Standard marked products are also continuouslychecked by BIS for conformity to that standard as afurther safeguard. Details of conditions under whicha license for the use of the Standard Mark may begranted to manufacturers or producers maybe obtained

3

A-

Is 15137:2002

from the Bureau of Indian Standards.

10 TESTS

10.1 Type Test

The following shall constitute the type tests:

a) Chemical composition;

b) Electrical conductivity;

c) Freedom from defects; and

d) Dimensions.

10.2 Acceptance Tests

The following shall constitute the acceptance test forthe purpose of acceptance of a lot inspection.

IS No.

292:1983

1359:1992

1364(Part 1): 1992

1608:1995

2102(Part 1) :1993

3063:1994

a)

b)

c)

Electrical conductivity;

Freedom from defects; and

Dimension.

10.3 Routine Tests

The following shall be routine tests:

a) Dimension, and

b) Freedom from defects.

11 METHODS OF TESTS

11.1 The tests on copper castings shall be carried outin accordance with IS 9805.

11.2 The tests on aluminium casting shall be carriedout in accordance with IS 5082.

ANNEX A

(Chufse2.1)

LIST OF REFERRED INDIAN STANDARDS

Title

Leaded brass ingots and castings(second revision)Specification for electroplated coat-ings of tin (third revision)Hexagon head bolts, screws and nutsof product grades A and B : Part 1Hexagon head bolts (size range M1.6 to M 64)Mechanical testing of metals — Ten-sile testing (second revision)General tolerances: Part 1Tolerancesfor linear and angular dimensionswithout individual toleranceindications (third revision)Specification for fastners — Singlecoil rectangular section spring wash-

ZS No.

3138:1966

3347

4218

5082:1998

6912:1985

9805:1981

Title

ers (second revision)Specification for hexagonal bolts andnuts (M 42 to M 150)Dimensions for porcelaintransformer bushings for use inlightly polluted atmospheres (issuedin parts) (second revision)1S0 metric screw threads (issued inparts)Wrought aluminum and aluminiumalloy bars, rods, tubes, sections,plates and sheets for electricalapplications (second revision)Copper and copper alloy forgingstock and forgings (first revision)High conductivity copper castings

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BI$. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. ET 06 (3073).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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