CENTRAL MARKS DEPARTMENT – II (Legal)
Our Ref: CMD-II(L)/16: 1180 (Part 1)
07 July 2015
Subject: Revision & Finalization of STI, DOC: STI/1180(Part 1)2 May 2015 for
Outdoor type oil immersed Distribution Transformers up to and including 2500 KVA,
33kV as per IS 1180 (Part 1):2014.
This is with reference to tentative STI DOC: STI/1180(Part 1)/1 March 2015 circulated to all RO/BOs
for perusal and comments vide note of even no. dated 24 03 2015 (hosted on BIS Intranet on 25 03
2015) for Outdoor type oil immersed Distribution Transformers up to and including 2500 KVA,
33kV as per IS 1180 (Part 1):2014.
Based on the comments received from the manufacturers/applicants the tentative STI dated March
2015 has been revised by changing the testing frequency for the requirements of Temperature rise
test and Pressure test.
The above STI has been revised & finalized by KKBO (Custodian BO) and approved by DDGE. A
copy of the revised STI DOC : STI/1180(Part 1)2 May 2015 is enclosed for ready reference and for
its implementation with immediate effect.
All RO/BOs are requested to inform the licensees/applicants of IS 1180(Part1):2014 under their
respective jurisdiction about the revision of existing STI and its compliance.
This is issued with the approval of Competent Authority.
(Sunil Kumar)
Sc. F
Head, CMD-II (Legal)
Circulated to : All ROs/BOs/SBOs/BIS Labs
Copy to : Head KKBO (Custodian BO)
: Head ETD
ITS – for hosting on BIS INTRANET& WEBSITE.
Doc: STI 1180 (Part 1)/2 May 2015
SCHEME OF TESTING AND INSPECTION FOR OUTDOOR TYPE OIL IMMERSED
DISTRIBUTION TRANSFORMERS UP TO AND INCLUDING 2500 KVA, 33kV
AS PER IS 1180 (Part 1):2014
1.0 LABORATORY/TESTING STATION: A laboratory/testing station shall be maintained, which
shall be suitably equipped and staffed, to carry out different tests and inspections according to the
Standard.
1.1 Environmental conditions wherever applicable shall be maintained.
2.0 TEST RECORDS: All records of tests and analysis shall be kept in suitable formats
2.1 Copies of any records or connected papers that may be required by BIS shall be made available at
any time on request.
2.2 For all stages of manufacture, the factory shall maintain appropriate controls and checks to ensure
that their product conforms to the various requirements of the Standard
3.0 QUALITY CONTROL: It is recommended that, as far as possible, Statistical Quality Control
(SQC) methods may be used for controlling the quality of the product during production as envisaged
in this Scheme. See IS 397(Part 1), IS 397(Part 2), IS 397(Part 3) and IS 397(Part 4)].
3.1 In addition, efforts should be made to gradually introduce Quality Management System in
accordance with IS/ISO 9001.
4.0 CALIBRATION: Testing instruments/equipments shall be carried out periodically from NABL
accredited calibration laboratories wherever they are available in the same city. In case where such
laboratories are not available, traceability to a National Measurement System (NPL) to be ensured.
All records of such calibrations to be kept.
5.0 STANDARD MARK: The standard mark as given in column 1 of the First Schedule of the
license shall be applied clearly and indelibly by stencilling/screen or ink jet
printing/embossing/etching/engraving on the rating plate, provided that the distribution transformers
conform to specified requirements of the Indian Standard.
5.1 RATING PLATE : The rating plate shall be according to Clause 13.1 of IS 1180(Part 1):2014
and shall be fitted in a visible position.
5.2 MARKING: In addition, the BIS Certification Mark Licence No. (CM/L XXXXXXXXXX) and
reference to BIS web site “For details of BIS certification marks scheme refer: - www.bis.org.in” shall
be clearly and indelibly marked on the rating plate.
5.3 TERMINAL MARKING PLATE: Each transformer to be provided with a terminal marking
plate as per Clause 13.2 of IS 1180 (Part 1):2014
6.0 LEVELS OF CONTROL: The tests, as indicated in Table 1 and at the levels of control specified
therein, shall be carried out on the whole production of the factory which is covered by this Scheme
and appropriate records and charts maintained in accordance with paragraph 2.0 above.
6.1 The criterion of acceptance/rejection of production will be as given below:
6.1.1 Each transformer when tested shall pass the routine tests. If a transformer fails in any one or
more of the requirements it shall be unfit for the purpose of marking.
6.1.1.1 The transformer rejected in 6.1.1 may however, be suitably repaired and the defects rectified.
Doc: STI 1180 (Part 1)/2 May 2015
Such repaired transformers when tested again shall conform to all the routine tests.
6.2 In respect of all other clauses of the Indian Standard, appropriate control and checks to be
maintained in order to ensure that the product conforms to the various requirements of the Indian
Standard.
6.3 All the production which conforms to the Indian Standard and covered by this License shall be
marked with the Standard Mark.
7.0 REJECTION: A separate record shall be maintained giving information relating to the rejection
of products which do not conform to the Indian Standard and the method of their disposal. Such
products shall in no case be stored together with those conforming to the Indian Standard.
8.0 SAMPLES: The licensee shall supply free of charge, the sample or samples required in
accordance with Bureau of Indian Standards (Certification ) Regulation, from his factory or godown.
BIS shall pay for the samples taken by it from the open market.
9.0 REPLACEMENT: Whenever a complaint is received soon after the product with Standard Mark
have been purchased and used, and if there is adequate evidence that the product has not been
misused, defective product shall be replaced or repaired free of cost by the licensee in case the
complaint is proved to be genuine and the warranty period (where applicable) has not expired. The
final authority to judge conformity of the product to the Indian Standard shall be with BIS. The firm
shall have own complaint investigation system as per IS/ISO 10002
9.1 In the event of any damages caused by the product bearing the Standard Mark, or claim being filed by
the consumers against BIS Standard Mark and “ not conforming” to the relevant Indian
Standard, entire liability arising out of such non conforming product shall be of the licensee and BIS
shall not in any way be responsible in such cases
10.0 STOP MARKING: The marking of the product shall be stopped under intimation to BIS, if at
any time, there is some difficulty in maintaining the conformity of the product to the Standard, or the
testing equipment goes out of order. The marking may be resumed as soon as the defects are removed
under intimation to BIS.
The marking of the product shall be stopped immediately if directed by BIS for any reason.
The marking may then be resumed only after permission by BIS. The information regarding
resumption of marking shall also be sent to BIS.
11.0 PRODUCTION DATA: The licensee shall send to BIS as per the enclosed Proforma-1
authenticated by a Chartered Accountant, a statement of quantity produced, marked and exported by
them and the trade value thereof at the end of each operative year of the license.
Doc: STI 1180 (Part 1)/2 May 2015
SCHEME OF TESTING AND INSPECTION FOR OUTDOOR TYPE OIL IMMERSED
DISTRIBUTION TRANSFORMERS UP TO AND INCLUDING 2500 KVA, 33kV
AS PER IS 1180 (Part 1):2014 TABLE-1: LEVELS OF CONTROL
LEVELS OF CONTROL
TEST DETAILS
Clause No.
Requirements
Test Method
(Clause/Reference)
RAW MATERIALS
9.1 a)
CRGO Electrical Steel
9.1 b)
9.1 c)
Amorphous core
material
Copper/Aluminium
Conductor
Kraft Paper
9.1 e)
9.1 f)
Press board
Mineral Oil
10.1.1
10.1.5
15.1
Bushings
Dimensions
Bushings
Transformer tank
15.3
Bolts, Nuts & Washers
15.4
Gasket
11
15.1
15.5
16
IS 3024
No. of
Frequency
Samples
Frequency
Each consignment of a
particular grade as
received
Shall be ISI Marked
with supplier test
certificate.
IS 191, IS 1897, IS
7404, IS 12444, IS
13730/ IS
6162
series as given in
Annex A of
IS
1180(Part-1)
Each consignment
IS 9335 series as
given in AnnexA of IS
1180(Part-1)
IS 1576
IS 335
-do-
ISI marked or Test
certificate of
conformity to the
relevant ISS as per
Annex A of IS 1180
(Part-1), from the
manufacturer/ BIS
recognized Lab
-do-
IS under preparation
9.1 d)
GENERAL
6.9.1 & 6.9.2 Permissible
7.9.1 & 7.9.2 density, Current
8.9.1 & 8.9.2 Voltage
REMARKS
-doEach Drum of
received
IS 2099 and IS 7421 Each consignment
of
IS 3347
Each consignment
--
-Type-III as per IS
11149/Type C as
per IS 4253(part2)
flux
and
Minimum clearances in
Air
Construction
of
transformer tank
Painting
of
Transformer Tank
Conservator for non
sealed
type
IS 1180 (Part 1)
Oil
Each consignment
tank is outsourced)
-do-do-do-do-
(if Qualification
certificated of
the
welder
to
be
maintained
Each consignment
Test certificate from
supplier
-do-do-
-do-
One sample each
of
identical
design/construction
and
of same nominal system
voltage and rating once
in five years.
Each transformer
-do-
Each transformer
-do-
Each transformer
-do-
Each transformer
Doc: STI 1180 (Part 1)/2 May 2015
transformers
ROUTINE TESTS
21.2 a)
Measurement
of IS 2026 (Part-1)
Each transformer
Winding Resistance
21.2 b)
Measurement
of IS 2026 (Part-1)
Each transformer
Voltage Ratio
and
check
of
Phase
Displacement
21.2 c)
Measurement of Short IS 2026 (Part-1)
Each transformer
6.8
Circuit
Impedance
7.8
(principal
tapping,
8.8
when applicable) and
load loss at 50 percent
and 100 percent load
21.2 d)
Measurement of no IS 2026 (Part-1)
Each transformer
load loss and current
21.2 e)
Measurement
of IS 2026 (Part-1)
Each transformer
insulation resistance
21.2 f)
Induced
overvoltage IS 2026 (Part-3)
Each transformer
withstand test
21.2 g)
Separate
source IS 2026 (Part-3)
Each transformer
voltage withstand test
15.2 &
Pressure test
Cl. 21.5 of IS
Each transformer
21.2 h)
1180(Part-1):2014
15.2 &
Oil Leakage test
Cl. 21.5 of IS
Each transformer
21.2 j)
1180(Part-1):2014
TYPE TESTS: To be carried out at the first instance and whenever there is any change in design
10
Terminal Arrangement
21.3 a)
Lightning
Impulse IS 2026 (Part-3)
One sample of identical design/construction
Test
and of same nominal voltage rating once in
five years.
21.3 b)
6.10
7.10
8.10
21.3 c) & 17
21.3 d)
Temperature rise test
IS 2026 (Part-2)
One sample of identical design/construction
and of same nominal voltage rating once every
year.
Short
withstand test
Pressure Test
Circuit IS 2026 (Part-5)
(up to 200kVA)
Cl.
One sample of identical design/construction
and of same nominal voltage rating once in
five years.
21.5 of IS
1180(Part1):2014
SPECIAL TESTS: To be carried out on mutual agreement between manufacturer and purchaser
(See Note below)
21.4 a)
Determination
of IS 2026 (Part-10)
As agreed between
Sound Levels
purchaser and manufacturer
21.4 b)
Short
Circuit IS 2026 (Part-5)
-dowithstand test
(up to 200kVA)
21.4 c)
No load current at Cl. 5.9.3 of IS
-do112.5% voltage
1180(P-1):2014
21.4 d)
Paint adhesion test
ASTM D 3359
-do21.4 e)
BDV
&Moisture
IS 335
-doContent
of
Transformer Oil
Note: Firm to give declaration at the time of drawal of applicant/inclusion sample and same to be
indicated in the test request.
Doc: STI 1180 (Part 1)/2 May 2015
PROFORMA - 1
PROFORMA FOR YEARLY PRODUCTION DETAILS
Period covered
Name of Licensee
CM/L No.
Name of Articles (s) IS No.
Grade/Type/Size
1.1 Brand/Trade/Name(s) of BIS Certification Marked Products
2. Total production of the articles(s) licensed for certification marking
2.1 Total production of the article(s) conforming to Indian Standard
3. Production covered with BIS Certification Mark and its approximate value
a) Quantity
b) Invoice sale price
3.1 Brand Name used on production covered under BIS Certification Mark
3.2 Calculation of marking fee on unit rate basis: Marking Fee per unit
a) Unit
b) Quantity covered with BIS Certification Mark
-----------------------------------------------------------------------------------------------------------Information to be filled up by BO before forwarding to the licensee.
Note : In case a clause is not applicable, suitable remarks may be given against it.
c) Marking fee rounded off in whole rupees as obtained by applying unit rates given in
(a) on quantity given in (b)
4. Quantity not covered with BIS Certification Mark. If any, and the reasons for such
non-coverage
4.1 Brand Name under which non-certified goods were sold
5.0 Quantity Exported with BIS Standard Mark and its value
5.1 Brand Name under which BIS Certified goods are exported
6.0 Authentication by Chartered Accountant