BUREAU OF INDIAN STANDARDS

Transcription

1 Manak Bhavan, 9 Bahadur Shah Zafar Marg New Delhi Phones Extn 4284 TeleFax Website : eetd@bis.org.in व य पक पर च लन म मस द रल ख र षण स ञ पन स द भ ददन क ईट ड 16/ ट म 2016 म म : ट ड र : 1. ट ड 16 य 2. म य म र य 3. म ल य म य य, य म मलम ए रम : ल रल. ष ट ड 16 ( ) ष 4 ल टट र ए ट ईट ड 16 ( ) ए मव च ष 10-1 ड ल ल ञ ट ड 16 ( 10667) ष 12 : र -ट ट ड 16 ( 10669) ष 14 : च ट ड 16 ( 10681) ट ड 16 ( ) ट ड 16 ( 10683) ट ड 16 ( ) ट ड 16 ( ) य ल सममत य र म म म ष 15 : ष 16 : च ड ट ष 18 : - ष रय ष रय म - ष ए म ल चड र रय ड रम म म ष ष र य ष 19 : ष ए र ए ट म म ञ म य ल ष 21 : वट ट लट ष ए, र म ल ए ष म ल म य य ए र : यर य र म ए य य य र य भ जन क अ त म र ख: 23 ट म य यर य ल र ए र ष म ल ररट रल र म म य म म यष ष रल च र य ए य, य, (.. य) ञ म ए र ल : र मलम ष (म य ) र मलम यर म य च र य ए यर यष मलए म य

2 Manak Bhavan, 9 Bahadur Shah Zafar Marg New Delhi Phones Extn 4284 TeleFax Website : eetd@bis.org.in DRAFTS IN WIDE CIRCULATION DOCUMENT DESPATCH ADVICE Reference Date ETD 16 T September 2016 TECHNICAL COMMITTEE ETD ADDRESSED TO: 1. All Members of Transformers Sectional Committee, ETD All Members of Electrotechnical Division Council; and 3. All other Interested. Dear Sir(s), Please find enclosed a copy of the following draft Indian Standard: Sl. No. Doc no. 1. ETD 16 ( ) 2. ETD 16 ( ) 3. ETD 16 (10667 ) 4. ETD 16 ( ) 5. ETD 16 ( ) 6. ETD 16 ( 10682) 7. ETD 16 ( ) 8. ETD 16 ( 10691) 9. ETD 16 ( 10692) Title Power transformers Part 4: Guide to the lightning impulse and switching impulse testing Power transformers and reactors Power transformers Part 10-1: Determination of sound levels Application guide Power transformers Part 12: Loading guide for dry-type power transformers Power transformers Part 14: Liquid-immersed power transformers using high-temperature insulation materials Power transformers Part 15: Gas-filled power transformers Power transformers Part 16: Transformers for wind turbine applications Power transformers Part 18: Measurement of frequency response Power transformers Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors Power transformers Part 21: Standard requirements, terminology, and test code for step-voltage regulators Kindly examine the draft standards and forward your views stating any difficulties which you are likely to experience in your business or profession, if these are finally adopted as Indian Standards. Comments, if any, may please be made in the format given overleaf and mailed to the undersigned. Last date for comments: 23 October In case no comments or only editorial comments are received, it will be presumed that there are no technical comments and the document may be finalized in consultation with the chairman of the sectional committee.

3 Manak Bhavan, 9 Bahadur Shah Zafar Marg New Delhi Phones Extn 4284 TeleFax Website : eetd@bis.org.in However, in case comments of technical nature are received, the chairman of the sectional committee will be consulted. Based on the decision of the chairman, the documents may either be finalized or referred to the sectional committee for further action. It may kindly be noted that the technical contents of the documents has not been enclosed as these are identical with the corresponding IEC standards. For details, please refer to the corresponding IEC publication as mentioned in the respective National Forewords or kindly contact the undersigned. Thanking you, Yours faithfully (P.V. Mathew) Sc E & Head (Electrotechnical) eetd@bis.org.in Encl : See attachment.

4 Manak Bhavan, 9 Bahadur Shah Zafar Marg New Delhi Phones Extn 4284 TeleFax Website : eetd@bis.org.in Date 23 September 2016 Sl. No. Name of the Organization Clause/ Subclause Paragraph/ Figure/Table Document No. Doc: ETD 16 ( 10665,10666,10667, 10669, 10681, 10682, 10683, 10691, 10692) Type of Comment (General/ Technical/ Editorial Comments Proposed Change

5 Doc: ETD 16 (10665) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 4: GUIDE TO THE LIGHTNING IMPULSE AND SWITCHING IMPULSE TESTING - POWER TRANSFORMERS AND REACTORS वर स मर भ ग 4 ल टन ग व ग ए व ववन ग ररए टर व ग र ष क स - वर स मर ए व Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 4) which is identical with IEC : 2002 Power transformers Part 4: Guide to the lightning impulse and switching impulse testing - Power transformers and reactors issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC High-voltage test IS 2071(Part 1):2014 High-voltage test Identical with techniques Part 1: General techniques - Part 1: General definitions IEC : definitions and test requirements and test requirements (Third Revision) 2010

6 IEC High-voltage test IS 60060(Part 2):2010 High voltage Identical with techniques Part 2: Measuring test techniques - Part 2 Measuring IEC systems systems (IEC :2010) :2010 IEC Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air IS 2026(Part 3):2009 Power Identical with Transformers - Part 3 Insulation levels, IEC dielectric tests and external clearances :2000 in air (third revision) IEC Reactors IS 3151:1982 (first revision) IEC Instruments and software used for measurement in high-voltage impulse tests Part 1: Requirements for instruments IS 15638(Part 1):2006 Instruments and Identical with software used for measurement in high IEC : voltage impulse tests: Part Requirements for instruments (Superseeding IS 11349) IEC Digital recorders for measurements in high-voltage impulse tests Part 2: Evaluation of software used for the determination of the parameters of impulse waveforms IS 15638(Part 2):2006 Instruments and Identical with software used for measurements in high IEC voltage impulse tests: Part 2 Evaluation :1996 of software used for the determination of the parameters of impulse waveforms (Superseeding IS 11349) Earthing transformers IEC :1968 Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

7 Doc: ETD 16 (10666) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 10-1: DETERMINATION OF SOUND LEVELS APPLICATION GUIDE व स म भ ग 10-1 स उ ड ल वल ञ त क न - अन र ग सस त Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 10/Sec 1) which is identical with IEC : 2016 Power transformers Part 10-1: Determination of sound levels Application guide issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC :2016, Power IS 2026 (Part 10) : 2009 Power Identical with transformers Part 10: Transformers - Part 10 Determination IEC : Determination of sound levels of sound levels 2001

8 Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

9 Doc: ETD 16 (10667) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 12: LOADING GUIDE FOR DRY-TYPE POWER TRANSFORMERS वर मर भ ग 12 : र ई-ट ई वर मर त ल ड ग ग ई Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 12) which is identical with IEC : 2008 Power transformers Part 12: Loading guide for dry-type power transformers issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard Title IEC Power transformers Part 11: Dry-type transformers IEC Electrical insulating materials Properties of thermal endurance Part 1: Ageing procedures and evaluation of test results

10 IEC :1997 Convertor transformers Part 1: Transformers for industrial applications Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

11 Doc: ETD 16 (10669) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 14: LIQUID-IMMERSED POWER TRANSFORMERS USING HIGHTEMPERATURE INSULATION MATERIALS व स म भ ग 14 : चत स र क र ग स रववत व व त व स म Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 14) which is identical with IEC : 2013 Power transformers Part 14: Liquid-immersed power transformers using high-temperature insulation materials issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard IEC , Power transformers Part 1: General Corresponding Indian Standard IS 2026(Part 1):2011 Power transformers: Part 1 General (first revision) Degree of Equivalence IEC :

12 2000 IEC :1993 IEC :2006 Identical with IEC : 2005 IEC , Power transformers Part 2: Temperature rise IS 2026(Part 2):2010 Power Transformers - Part 2 Temperature rise (first revision) IEC , Power transformers Part 5: Ability to withstand short- circuit IS 2026(Part 5):2011 Power Transformers - Part 5 Ability to withstand short circuit (first revision) IEC , Power transformers Part 7: Loading guide for oilimmersed power transformers IS 2026(Part 7):2009 Power Transformers - Part 7 Loading guide for oil immersed power transformers IEC 60085, Electrical insulation Thermal evaluation and designation IS 1271:2012 Electrical Insulation - Identical with Thermal Evaluation and designation IEC 60085: 2007 (Second Revision) IEC 60137, Insulated bushings for alternating voltages above V IS 2099:1986 Bushings for alternating voltages above Volts (second revision) IEC :1984 IEC , Tap-changers Part 1: Performance requirements and test methods IS 8468:1977 On-load tap changers IEC 60214: 1966 IEC 60296, Fluids for electrotechnical applications Unused mineral insulating oils for transformers and switchgear IS 335:1993 New insulating oils (fourth revision) IEC :1982 IEC 61099, Specifications for unused synthetic organic esters for electrical purposes IS 16081:2013 Insulating liquids - Identical with Specifications for unused synthetic IEC 61099: 2010 organic esters for electrical purposes The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard IEC , IEC IEC Title Power transformers Part 16: Transformers for wind turbine applications Specifications for unused silicone insulating liquids for electrotechnical purposes Convertor transformers Part 1: Transformers for industrial applications

13 IEC Convertor transformers Part 2: Transformers for HVDC applications Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

14 Doc: ETD 16 (10681) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 15: GAS-FILLED POWER TRANSFORMERS वर स मर भ ग 15 : ग स भर ई वर स मर Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 15) which is identical with IEC : 2015 Power transformers Part 15: Gas-filled power transformers issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC :2011, Power IS 2026(Part 1):2011 Power transformers Part 1: General transformers: Part 1 General (first revision) IEC : 2000

15 IEC :2011, Power IS 2026(Part 2):2010 Power transformers Part 2: Temperature Transformers - Part 2 Temperature rise rise for liquid-immersed (first revision) transformers IEC :1993 IEC , Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air Identical with IEC :2000 IS 2026(Part 3):2009 Power Transformers - Part 3 Insulation levels, dielectric tests and external clearances in air (third revision) IEC , Power transformers IS 2026(Part 5):2011 Power Part 5: Ability to withstand short Transformers - Part 5 Ability to circuit withstand short circuit (first revision) IEC :2006 IEC , Power transformers IS 2026 (Part 10) : 2009 Power Identical with Part 10: Determination of sound Transformers - Part 10 Determination IEC : levels of sound levels 2001 IEC 60137, Insulated bushings for IS 2099:1986 Bushings for alternating alternating voltages above V voltages above Volts (second revision) IEC :1984 IEC 60376, Specification of technical grade sulfur hexafluoride (SF6) for use in electrical equipment IS 13072:2013 Specification of technical grade Sulfur hexafluoride (SF6) for use In electrical equipment (First Revision) Identical with IEC 60376:2005 IEC , High-voltage switchgear and controlgear Part 1: Common specifications IS 62271(Part 1):2007 High-voltage switchgear and controlgear: Part 1 Common Specification (IEC :2007) (Superseding IS 12729) Identical with IEC :2007 The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard Title IEC Guidelines for the checking and treatment of sulfur hexafluoride (SF6) taken from electrical equipment and specification for its re-use IEC :2002 High-voltage switchgear and controlgear Part 4: Handling procedures for sulphur hexafluoride (SF6) and its mixtures

16 Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

17 Doc: ETD 16 (10682) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 16: TRANSFORMERS FOR WIND TURBINE APPLICATIONS व म ग 16 : ववड ट ईन अन र ग त म Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 16) which is identical with IEC : 2011 Power transformers Part 16: Transformers for wind turbine applications issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC :2011, Power IS 2026 (Part 1):2011 Power transformers Part 1: General transformers: Part 1 General (first revision) IEC :2000

18 IEC :2011, Power IS 2026(Part 2):2010 Power transformers Part 2: Temperature Transformers - Part 2 Temperature rise rise for liquid-immersed (first revision) Transformers IEC :1993 IEC :2000, Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air Identical with IEC :2000 IS 2026(Part 3):2009 Power Transformers - Part 3 Insulaiton levels, dielectric tests and external clearances in air (third revision) IEC :2006, Power IS 2026(Part 5):2011 Power transformers Part 5: Ability to Transformers - Part 5 Ability to withstand short circuit withstand short circuit (first revision) IEC :2006 IEC :2005, Power transformers Part 7: Loading guide for oil-immersed power Transformers IEC :1997, Power transformers Application guide IS 2026(Part 7):2009 Power Transformers - Part 7 Loading guide for oil immersed power transformers Identical with IEC :2005 IS 2026(Part 8):2009 Power Transformers - Part 8 Application guide Identical with IEC :1997 The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard Title IEC :2004, Power transformers Part 11: Dry-type transformers IEC :2008, Power transformers Part 12: Loading guide for dry-type power Transformers IEC :2006 Power transformers Part 13: Self-protected liquid-filled transformers IEC Classification of insulating liquids according to fire-point and net calorific value IEC :2011 Converter transformers Part 1: Transformers for industrial applications IEC :2006 Converter transformers Part 3: Application guide IEC :2005 Wind turbines Part 1: Design requirements

19 ISO (all parts) Paints and varnishes Corrosion protection of steel structures by protective paint systems Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

20 Doc: ETD 16 (10683) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 18: MEASUREMENT OF FREQUENCY RESPONSE व स म भ ग 18 : वत न र क न Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 18) which is identical with IEC : 2012 Power transformers Part 18: Measurement of frequency response issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

21 Doc: ETD 16 (10691) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 19: RULES FOR THE DETERMINATION OF UNCERTAINTIES IN THE MEASUREMENT OF THE LOSSES ON POWER TRANSFORMERS AND REACTORS व स म ग 19 : व स म ए व र ए ट स क क न कस क अन न तत ञ त वल Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 19) which is identical with IEC : 2013 Power transformers Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC :2011 Power transformers Part 1: General IS 2026(Part 1):2011 Power transformers: Part 1 General (first revision) IEC :2000

22 IEC :2011, Power IS 2026(Part 2):2010 Power transformers Part 2: Temperature Transformers - Part 2 Temperature rise rise for liquid-immersed (first revision) transformers IEC :1993 Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

23 Doc: ETD 16 (10692) DRAFT FOR COMMENTS ONLY (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard POWER TRANSFORMERS PART 21: STANDARD REQUIREMENTS, TERMINOLOGY, AND TEST CODE FOR STEP-VOLTAGE REGULATORS र मर भ ग 21 : ट ट र गल टर नक अ ष ए, ररभ ष क द ल ए रष ष Last date of receipt of comments: 23 October 2016 Transformers Sectional Committee, ETD 16 NATIONAL FOREWORD This Indian Standard (Part 21) which is identical with IEC : 2011 Power transformers Part 21: Standard requirements, terminology, and test code for step-voltage regulators issued by the International Electrotechnical Commission (IEC) is proposed to be adopted by the Bureau of Indian Standards on the recommendation of the Transformers Sectional Committee, and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard IEC , Tap-changers Part IS 8468:1977 On-load tap changers 1: Performance requirements and test methods Degree of Equivalence Identical with IEC 60214: 1966

24 IEC , Electrical Relays Part 5: Insulation coordination for measuring relays and protection equipment Requirements and tests. Doc ETD 35 (6530) Electrical relays Identical with Part 5: Insulation coordination for IEC measuring relays and protection :2000 equipment requirements and tests (under print) IEC , Electrical Relays Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment Section one: Vibration tests (sinusoidal). Doc ETD 35 (6536) Electrical relays Identical with Part 21: Vibration, shock, bump and IEC : seismic test on measuring relays and 1988 protection equipment section one vibration tests (sinusoidal) (under print) IEC , Measuring relays and protection equipment Part 22-1: Electrical disturbance tests 1 MHz burst immunity tests. Doc ETD 35 (6539) Measuring relays Identical with and protection equipment Part 22-1: IEC Electrical disturbance tests 1 mhz :2007 burst immunity tests (under print) IEC , Measuring relays and protection equipment Part 22-2: Electrical disturbance tests Electrostatic discharge tests. Doc ETD 35 (6540) Measuring relays Identical with and protection equipment Part 22-2: IEC Electrical disturbance tests :2008 electrostatic discharge tests (under print) IEC , Measuring relays and protection equipment Part 22-3: Electrical disturbance tests Radiated electromagnetic field immunity Doc ETD 35 (6541) Measuring relays Identical with and protection equipment Part 22-3: IEC Electrical disturbance tests radiated :2007 electromagnetic field immunity (under print) IEC , Measuring relays and protection equipment Part 22-4: Electrical disturbance tests Electrical fast transient/burst immunity test. Doc ETD 35 (6542) Measuring relays Identical with and protection equipment Part 22-4: IEC Electrical disturbance tests electrical :2008 fast transient/burst immunity test (under print) IEC , Measuring relays and protection equipment Part 22-5: Electrical disturbance tests for measuring relays and protection equipment Surge immunity test. Doc ETD 35 (6543) Measuring relays Identical with and protection equipment Part 22-5: IEC : Electrical disturbance tests surge 2008 immunity test (under print) IEC , Electrical relays Part 22-6: Electrical disturbance tests for measuring relays and protection equipment Immunity to conducted disturbances induced by radio Doc ETD 35 (6544) Electrical relays Identical with Part 22-6: Electrical disturbance tests IEC for measuring relays and protection :2001 equipment Immunity to conducted disturbances induced by radio frequency fields (under print)

25 frequency fields. The technical committee has reviewed the provisions of the following International Standards referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard Title IEC Environmental testing Part 2-1: Tests Test A: Cold IEC , Environmental testing Part 2-2: Tests Test B: Dry heat. IEC Environmental testing Part 2-30: Tests Test Db: Damp heat, cyclic (12 h + 12 h cycle). IEEE Standard Techniques for High-Voltage Testing. IEEE Std 4 IEEE Std C IEEE Std C IEEE Standard Surge Withstand Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus IEEE Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers. IEEE Standard Electrostatic Discharge Tests for Protective Relays. IEEE Std C IEEE Standard for Pole-Mounted Equipment Enclosure Integrity IEEE Std C57.91 IEEE Guide for Loading Mineral-Oil-Immersed Transformers IEEE Std C57.98 IEEE Guide for Transformer Impulse Tests. IEEE Std C IEEE Standard Requirements for Load Tap Changers IEEE Std C Only the English language text of the IEC Standard has been retained while adopting it as an Indian Standard and as such the page numbers given here are not same as in IEC Standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding of numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.