Table of Contents

<toc>
<bookmarktable>
<bookmark index='0'>
<pageno>1</pageno>
<text>AS 1243-1982 VOLTAGE TRANSFORMERS FOR MEASUREMENT AND PROTECTION</text>
<bookmark index='1'>
<pageno>4</pageno>
<text>PREFACE</text>
</bookmark>
<bookmark index='2'>
<pageno>6</pageno>
<text>CONTENTS</text>
</bookmark>
<bookmark index='3'>
<pageno>7</pageno>
<text>SECTION 1. SCOPE AND GENERAL REQUIREMENTS</text>
<bookmark index='4'>
<pageno>7</pageno>
<text>1.1 SCOPE.</text>
</bookmark>
<bookmark index='5'>
<pageno>7</pageno>
<text>1.2 APPLICATION.</text>
</bookmark>
<bookmark index='6'>
<pageno>7</pageno>
<text>1.3 DEFINITIONS.</text>
<bookmark index='7'>
<pageno>7</pageno>
<text>1.3.1 General.</text>
</bookmark>
<bookmark index='8'>
<pageno>7</pageno>
<text>1.3.2 Definitions Relating to Construction.</text>
</bookmark>
<bookmark index='9'>
<pageno>8</pageno>
<text>1.3.3 Definitions Relating to Performance.</text>
</bookmark>
<bookmark index='10'>
<pageno>8</pageno>
<text>1.3.4 Definitions Relating to Service Conditions of a Three- phase System.</text>
</bookmark>
<bookmark index='11'>
<pageno>9</pageno>
<text>1.3.5 Definitions Relating to Capacitor Voltage Transformers (CVTs)</text>
</bookmark>
<bookmark index='12'>
<pageno>9</pageno>
<text>1.3.6 Definitions Relating to Residual Voltage.</text>
</bookmark>
</bookmark>
<bookmark index='13'>
<pageno>10</pageno>
<text>1.4 SERVICE CONDITIONS</text>
</bookmark>
<bookmark index='14'>
<pageno>10</pageno>
<text>1.5 RATED FREQUENCY.</text>
</bookmark>
<bookmark index='15'>
<pageno>10</pageno>
<text>1.6 RATED INSULATION LEVEL (RIL)</text>
<bookmark index='16'>
<pageno>10</pageno>
<text>1.6.1 Selection.</text>
</bookmark>
<bookmark index='17'>
<pageno>10</pageno>
<text>1.6.2 Method of Expression.</text>
</bookmark>
</bookmark>
<bookmark index='18'>
<pageno>10</pageno>
<text>1.7 RATED PRIMARY VOLTAGE.</text>
</bookmark>
<bookmark index='19'>
<pageno>12</pageno>
<text>1.8 OVERVOLTAGE RATINGS.</text>
</bookmark>
<bookmark index='20'>
<pageno>12</pageno>
<text>1.9 ACCURACY.</text>
<bookmark index='21'>
<pageno>12</pageno>
<text>1.9.1 Classification System.</text>
</bookmark>
<bookmark index='22'>
<pageno>12</pageno>
<text>1.9.2 Conditions for Compliance With Error Limits.</text>
</bookmark>
<bookmark index='23'>
<pageno>12</pageno>
<text>1.9.3 VT With More Than One Secondary Winding.</text>
</bookmark>
<bookmark index='24'>
<pageno>12</pageno>
<text>1.9.4 VT Having a Secondary Winding With Two Classifications.</text>
</bookmark>
</bookmark>
<bookmark index='25'>
<pageno>13</pageno>
<text>1.10 TEMPERATURE RISE.</text>
<bookmark index='26'>
<pageno>13</pageno>
<text>1.10.1 General.</text>
</bookmark>
<bookmark index='27'>
<pageno>13</pageno>
<text>1.10.2 Temperature Rise of Windings.</text>
</bookmark>
<bookmark index='28'>
<pageno>13</pageno>
<text>1.10.3 Temperature Rise of Oil.</text>
</bookmark>
<bookmark index='29'>
<pageno>13</pageno>
<text>1.10.4 Temperature Rise of Core or Other Metallic Parts.</text>
</bookmark>
</bookmark>
<bookmark index='30'>
<pageno>13</pageno>
<text>1.11 CURRENT DENSITY.</text>
</bookmark>
<bookmark index='31'>
<pageno>13</pageno>
<text>1.12 SECONDARY WINDINGS.</text>
</bookmark>
<bookmark index='32'>
<pageno>13</pageno>
<text>1.13 MARKINGS.</text>
</bookmark>
<bookmark index='33'>
<pageno>14</pageno>
<text>1.14 ROUTINE TESTS.</text>
<bookmark index='34'>
<pageno>14</pageno>
<text>1.14.1 General.</text>
</bookmark>
<bookmark index='35'>
<pageno>14</pageno>
<text>1.14.2 Verification of Terminal Markings.</text>
</bookmark>
<bookmark index='36'>
<pageno>14</pageno>
<text>1.14.3 Short Duration Power-frequency Withstand Tests on Secondary Installation.</text>
</bookmark>
<bookmark index='37'>
<pageno>15</pageno>
<text>1.14.4 Short Duration Power-frequency Withstand Tests (dry) on Primary Insulation.</text>
</bookmark>
<bookmark index='38'>
<pageno>15</pageno>
<text>1.14.5 Partial Discharge Test.</text>
</bookmark>
<bookmark index='39'>
<pageno>15</pageno>
<text>1.14.6 Routine Tests for Accuracy</text>
</bookmark>
<bookmark index='40'>
<pageno>16</pageno>
<text>1.14.7 Measurement of Dielectric Dissipation Factor (Tangent Delta)</text>
</bookmark>
</bookmark>
<bookmark index='41'>
<pageno>16</pageno>
<text>1.15 TYPE TESTS.</text>
<bookmark index='42'>
<pageno>16</pageno>
<text>1.15.1 General.</text>
</bookmark>
<bookmark index='43'>
<pageno>16</pageno>
<text>1.15.2 Power-frequency Withstand Test (Wet) on Outdoor VTs.</text>
</bookmark>
<bookmark index='44'>
<pageno>16</pageno>
<text>1.15.3 Impulse-voltage Withstand Test on Primary Insulation.</text>
</bookmark>
<bookmark index='45'>
<pageno>17</pageno>
<text>1.15.4 Tests for Temperature Rise.</text>
</bookmark>
<bookmark index='46'>
<pageno>17</pageno>
<text>1.15.5 Tests for Current Density in Windings.</text>
</bookmark>
<bookmark index='47'>
<pageno>18</pageno>
<text>1.15.6 Type Tests for Accuracy.</text>
</bookmark>
</bookmark>
<bookmark index='48'>
<pageno>18</pageno>
<text>1.16 SPECIAL TYPE TEST-RADIO INFLUENCE VOLTAGE (RIV) TEST.</text>
</bookmark>
<bookmark index='49'>
<pageno>18</pageno>
<text>1.17 COMMISSIONING TESTS.</text>
</bookmark>
</bookmark>
<bookmark index='50'>
<pageno>19</pageno>
<text>SECTION 2. SINGLE-PHASE ELECTROMAGNETIC VOLTAGE TRANSFORMERS</text>
<bookmark index='51'>
<pageno>19</pageno>
<text>2.1 SCOPE OF SECTION.</text>
</bookmark>
<bookmark index='52'>
<pageno>19</pageno>
<text>2.2 APPLICATION.</text>
</bookmark>
<bookmark index='53'>
<pageno>19</pageno>
<text>2.3 RATED SECONDARY VOLTAGE.</text>
</bookmark>
<bookmark index='54'>
<pageno>19</pageno>
<text>2.4 RATED BURDEN AND OUTPUT.</text>
</bookmark>
<bookmark index='55'>
<pageno>19</pageno>
<text>2.5 RATED VOLTAGE FACTOR AND RATED DURATION.</text>
</bookmark>
<bookmark index='56'>
<pageno>19</pageno>
<text>2.6 TERMINAL MARKINGS.</text>
<bookmark index='57'>
<pageno>19</pageno>
<text>2.6.1 Marking.</text>
</bookmark>
<bookmark index='58'>
<pageno>19</pageno>
<text>2.6.2 System of Identification.</text>
</bookmark>
<bookmark index='59'>
<pageno>19</pageno>
<text>2.6.3 Polarity of Windings.</text>
</bookmark>
</bookmark>
<bookmark index='60'>
<pageno>19</pageno>
<text>2.7 TYPE TESTING FOR ACCURACY OF SINGLE- PHASE UNIFORMLY INSULATED VTs.</text>
<bookmark index='61'>
<pageno>19</pageno>
<text>2.7.1 Tests for Symmetry of Primary Winding.</text>
</bookmark>
<bookmark index='62'>
<pageno>20</pageno>
<text>2.7.2 Further Tests for Accuracy.</text>
</bookmark>
</bookmark>
</bookmark>
<bookmark index='63'>
<pageno>21</pageno>
<text>SECTION 3. CAPACITOR VOLTAGE TRANSFORMERS</text>
<bookmark index='64'>
<pageno>21</pageno>
<text>3.1 SCOPE OF SECTION.</text>
</bookmark>
<bookmark index='65'>
<pageno>21</pageno>
<text>3.2 APPLICATION.</text>
</bookmark>
<bookmark index='66'>
<pageno>21</pageno>
<text>3.3 RATED SECONDARY VOLTAGE.</text>
</bookmark>
<bookmark index='67'>
<pageno>21</pageno>
<text>3.4 RATED BURDEN AND OUTPUT.</text>
</bookmark>
<bookmark index='68'>
<pageno>21</pageno>
<text>3.5 RATED VOLTAGE FACTOR AND RATED DURATION.</text>
</bookmark>
<bookmark index='69'>
<pageno>21</pageno>
<text>3.6 SPECIAL REQUIREMENTS.</text>
<bookmark index='70'>
<pageno>21</pageno>
<text>3.6.1 Capacitor Voltage Divider (CVD).</text>
</bookmark>
<bookmark index='71'>
<pageno>21</pageno>
<text>3.6.2 Carrier-frequency Coupling.</text>
</bookmark>
</bookmark>
<bookmark index='72'>
<pageno>21</pageno>
<text>3.7 CONDITIONS FOR COMPLIANCE WITH ERROR LIMITS.</text>
</bookmark>
<bookmark index='73'>
<pageno>21</pageno>
<text>3.8 TERMINAL MARKINGS.</text>
<bookmark index='74'>
<pageno>21</pageno>
<text>3.8.1 General.</text>
</bookmark>
<bookmark index='75'>
<pageno>21</pageno>
<text>3.8.2 System of Identification.</text>
</bookmark>
<bookmark index='76'>
<pageno>21</pageno>
<text>3.8.3 Polarity of Windings.</text>
</bookmark>
</bookmark>
<bookmark index='77'>
<pageno>22</pageno>
<text>3.9 MARKINGS.</text>
</bookmark>
<bookmark index='78'>
<pageno>22</pageno>
<text>3.10 TRANSIENT RESPONSE TO PRIMARY SHORT CIRCUIT.</text>
</bookmark>
<bookmark index='79'>
<pageno>22</pageno>
<text>3.11 FERRO-RESONANCE.</text>
<bookmark index='80'>
<pageno>22</pageno>
<text>3.11.1 With Zero Burden.</text>
</bookmark>
<bookmark index='81'>
<pageno>22</pageno>
<text>3.11.2 With 0.25 p.u. Rated Burden.</text>
</bookmark>
</bookmark>
<bookmark index='82'>
<pageno>22</pageno>
<text>3.12 OVERVOLTAGE PROTECTIVE DEVICE.</text>
</bookmark>
<bookmark index='83'>
<pageno>22</pageno>
<text>3.13 ROUTINE TESTS.</text>
<bookmark index='84'>
<pageno>22</pageno>
<text>3.13.1 Variation of Section 1 Requirements.</text>
</bookmark>
<bookmark index='85'>
<pageno>23</pageno>
<text>3.13.2 Additional Tests.</text>
</bookmark>
</bookmark>
<bookmark index='86'>
<pageno>23</pageno>
<text>3.14 TYPE TESTS.</text>
<bookmark index='87'>
<pageno>23</pageno>
<text>3.14.1 Variation of Section 1 Requirements.</text>
</bookmark>
<bookmark index='88'>
<pageno>23</pageno>
<text>3.14.2 Additional Tests.</text>
</bookmark>
</bookmark>
<bookmark index='89'>
<pageno>23</pageno>
<text>3.15 COMMISSIONING TEST.</text>
</bookmark>
</bookmark>
<bookmark index='90'>
<pageno>24</pageno>
<text>SECTION 4. THREE-PHASE VOLTAGE TRANSFORMERS</text>
<bookmark index='91'>
<pageno>24</pageno>
<text>4.1 SCOPE OF SECTION.</text>
</bookmark>
<bookmark index='92'>
<pageno>24</pageno>
<text>4.2 APPLICATION.</text>
</bookmark>
<bookmark index='93'>
<pageno>24</pageno>
<text>4.3 CATEGORY OF PERFORMANCE.</text>
</bookmark>
<bookmark index='94'>
<pageno>24</pageno>
<text>4.4 RATED VOLTAGES.</text>
</bookmark>
<bookmark index='95'>
<pageno>24</pageno>
<text>4.5 RATED BURDEN AND OUTPUT.</text>
<bookmark index='96'>
<pageno>24</pageno>
<text>4.5.1 For VTs Other Than Designation R.</text>
</bookmark>
<bookmark index='97'>
<pageno>24</pageno>
<text>4.5.2 For Designation R VTs.</text>
</bookmark>
</bookmark>
<bookmark index='98'>
<pageno>24</pageno>
<text>4.6 RATED VOLTAGE FACTOR AND RATED DURATION.</text>
<bookmark index='99'>
<pageno>24</pageno>
<text>4.6.1 For VTs Other Than Designation R.</text>
</bookmark>
<bookmark index='100'>
<pageno>24</pageno>
<text>4.6.2 For Designation R VTs.</text>
</bookmark>
</bookmark>
<bookmark index='101'>
<pageno>24</pageno>
<text>4.7 ACCURACY.</text>
<bookmark index='102'>
<pageno>24</pageno>
<text>4.7.1 Accuracy of Three-phase Category A VTs.</text>
</bookmark>
<bookmark index='103'>
<pageno>24</pageno>
<text>4.7.2 Accuracy of Three-phase Category B VTs.</text>
</bookmark>
<bookmark index='104'>
<pageno>26</pageno>
<text>4.7.3 Accuracy of Designation R VTs.</text>
</bookmark>
</bookmark>
<bookmark index='105'>
<pageno>26</pageno>
<text>4.8 TERMINAL MARKINGS.</text>
<bookmark index='106'>
<pageno>26</pageno>
<text>4.8.1 General.</text>
</bookmark>
<bookmark index='107'>
<pageno>26</pageno>
<text>4.8.2 System of Identification.</text>
</bookmark>
<bookmark index='108'>
<pageno>26</pageno>
<text>4.8.3 Polarity of Windings.</text>
</bookmark>
</bookmark>
<bookmark index='109'>
<pageno>26</pageno>
<text>4.9 TERMINALPOSITIONS.</text>
</bookmark>
<bookmark index='110'>
<pageno>26</pageno>
<text>4.10 ROUTINE TESTS.</text>
<bookmark index='111'>
<pageno>26</pageno>
<text>4.10.1 Variation of Section 1 Requirements.</text>
</bookmark>
<bookmark index='112'>
<pageno>26</pageno>
<text>4.10.2 Power-frequency Withstand Tests on Non-uniformly Insulated VTs.</text>
</bookmark>
<bookmark index='113'>
<pageno>26</pageno>
<text>4.10.3 Tests for Accuracy.</text>
</bookmark>
<bookmark index='114'>
<pageno>28</pageno>
<text>4.10.4 Symmetrical Voltage Tests on Designation R VT.</text>
</bookmark>
</bookmark>
<bookmark index='115'>
<pageno>28</pageno>
<text>4.11 TYPE TESTS.</text>
<bookmark index='116'>
<pageno>28</pageno>
<text>4.11.1 Variation of Section 1 Requirements.</text>
</bookmark>
<bookmark index='117'>
<pageno>28</pageno>
<text>4.11.2 Unsymmetrical Tests on Three- phase Category B VTs and Designation R VTs Having Two Secondary Windings.</text>
</bookmark>
</bookmark>
</bookmark>
<bookmark index='118'>
<pageno>30</pageno>
<text>SECTION 5. DESIGNATION L VOLTAGE TRANSFORMERS</text>
<bookmark index='119'>
<pageno>30</pageno>
<text>5.1 SCOPE OF SECTION.</text>
</bookmark>
<bookmark index='120'>
<pageno>30</pageno>
<text>5.2 APPLICATION.</text>
</bookmark>
<bookmark index='121'>
<pageno>30</pageno>
<text>5.3 RATED PRIMARY VOLTAGE.</text>
</bookmark>
<bookmark index='122'>
<pageno>30</pageno>
<text>5.4 RATED SECONDARY VOLTAGES.</text>
</bookmark>
<bookmark index='123'>
<pageno>30</pageno>
<text>5.5 RATED BURDEN.</text>
</bookmark>
<bookmark index='124'>
<pageno>30</pageno>
<text>5.6 RATED VOLTAGE FACTOR AND RATED DURATION.</text>
</bookmark>
<bookmark index='125'>
<pageno>30</pageno>
<text>5.7 ACCURACY.</text>
</bookmark>
<bookmark index='126'>
<pageno>30</pageno>
<text>5.8 TERMINAL MARKINGS.</text>
<bookmark index='127'>
<pageno>30</pageno>
<text>5.8.1 System of Identification.</text>
</bookmark>
<bookmark index='128'>
<pageno>30</pageno>
<text>5.8.2 Polarity of Windings.</text>
</bookmark>
<bookmark index='129'>
<pageno>30</pageno>
<text>5.8.3 Marking.</text>
</bookmark>
</bookmark>
<bookmark index='130'>
<pageno>30</pageno>
<text>5.9 ACCURACY TESTING OF UNIFORMLY INSULATED DESIGNATION L VTs.</text>
<bookmark index='131'>
<pageno>30</pageno>
<text>5.9.1 Tests for Symmetry of Primary Winding.</text>
</bookmark>
<bookmark index='132'>
<pageno>31</pageno>
<text>5.9.2 Further Tests for Accuracy.</text>
</bookmark>
</bookmark>
</bookmark>
<bookmark index='133'>
<pageno>32</pageno>
<text>APPENDIX A - SERVICE CONDITIONS</text>
<bookmark index='134'>
<pageno>32</pageno>
<text>A1 AMBIENT TEMPERATURE.</text>
</bookmark>
<bookmark index='135'>
<pageno>32</pageno>
<text>A2 LOCAL ATMOSPHERIC AND CLIMATIC CONDITIONS.</text>
</bookmark>
</bookmark>
<bookmark index='136'>
<pageno>33</pageno>
<text>APPENDIX B - GUIDANCE IN THE SELECTION OF RATED VOLTAGE FACTOR</text>
</bookmark>
<bookmark index='137'>
<pageno>34</pageno>
<text>APPENDIX C - CLASSES OF ACCURACY AND THEIR APPLICATIONS</text>
</bookmark>
<bookmark index='138'>
<pageno>36</pageno>
<text>APPENDIX D - DERIVATION OF ERRORS AT DIFFERING BURDENS AND POWER FACTORS</text>
<bookmark index='139'>
<pageno>36</pageno>
<text>D1 THEORY.</text>
</bookmark>
<bookmark index='140'>
<pageno>36</pageno>
<text>D2 CONSTRUCTION OF THE DIAGRAM.</text>
</bookmark>
<bookmark index='141'>
<pageno>37</pageno>
<text>D3 ANALYTICAL METHOD.</text>
</bookmark>
<bookmark index='142'>
<pageno>37</pageno>
<text>D4 EXAMPLE OF CALCULATION.</text>
</bookmark>
</bookmark>
<bookmark index='143'>
<pageno>39</pageno>
<text>APPENDIX E - TEMPERATURE MEASUREMENTS</text>
<bookmark index='144'>
<pageno>39</pageno>
<text>E1 INTRODUCTION.</text>
</bookmark>
<bookmark index='145'>
<pageno>39</pageno>
<text>E2 MEASUREMENT OF TEMPERATURE RISE OF WINDINGS</text>
</bookmark>
<bookmark index='146'>
<pageno>39</pageno>
<text>E3 MEASUREMENT OF TEMPERATURE OF OIL</text>
</bookmark>
<bookmark index='147'>
<pageno>39</pageno>
<text>E4 MEASUREMENT OF TEMPERATURE OF CORES OR OTHER METALLIC PARTS FOR DESIGNS NOT UTILIZING LIQUID INSULANT.</text>
</bookmark>
<bookmark index='148'>
<pageno>39</pageno>
<text>E5 DURATION OF THE TEMPERATURE-RISE TESTS.</text>
</bookmark>
<bookmark index='149'>
<pageno>40</pageno>
<text>E6 ERRORS IN TEMPERATURE-RISE TESTS.</text>
</bookmark>
</bookmark>
<bookmark index='150'>
<pageno>41</pageno>
<text>APPENDIX F - DETECTION OF INSULATION FAILURE DURING AN IMPULSE VOLTAGE WITHSTAND TEST</text>
</bookmark>
<bookmark index='151'>
<pageno>42</pageno>
<text>APPENDIX G - DETERMINATION OF PRIMARY AND SECONDARY CURRENTS</text>
<bookmark index='152'>
<pageno>42</pageno>
<text>G1 APPLICATION.</text>
</bookmark>
<bookmark index='153'>
<pageno>42</pageno>
<text>G2 METHOD 1: ENERGIZATION OF THE PRIMARY WINDING.</text>
<bookmark index='154'>
<pageno>42</pageno>
<text>G2.1 For Single-phase VTs having 1.5 or 1.9, and for Three phase Category A VTs having Fv = 1.5.</text>
</bookmark>
<bookmark index='155'>
<pageno>43</pageno>
<text>G2.2 For Three-phase Category B VTs.</text>
</bookmark>
</bookmark>
<bookmark index='156'>
<pageno>44</pageno>
<text>G3 METHOD 2: ENERGIZATION OF THE SECONDARY WINDING.</text>
<bookmark index='157'>
<pageno>44</pageno>
<text>G3.1 For Single-phase VTs having Fv = 1.5 or 1.9, and for Three-phase Category A VTs having Fv = 1.5.</text>
</bookmark>
<bookmark index='158'>
<pageno>45</pageno>
<text>G3.2 For Three phase Category B VTs.</text>
</bookmark>
</bookmark>
</bookmark>
<bookmark index='159'>
<pageno>46</pageno>
<text>APPENDIX H - DETERMINATION OF TEMPERATURE COEFFICIENTS OF ERROR</text>
<bookmark index='160'>
<pageno>46</pageno>
<text>H1 TEMPERATURE COEFFICIENTS OF ERROR.</text>
</bookmark>
<bookmark index='161'>
<pageno>46</pageno>
<text>H2 METHODS OF DETERMINATION OF COEFFICIENTS.</text>
</bookmark>
<bookmark index='162'>
<pageno>46</pageno>
<text>H3 DETERMINATION BY MEASUREMENT.</text>
</bookmark>
<bookmark index='163'>
<pageno>46</pageno>
<text>H4 DETERMINATION BY CALCULATION FOR ELECTROMAGNETIC VTs.</text>
</bookmark>
</bookmark>
<bookmark index='164'>
<pageno>47</pageno>
<text>APPENDIX J - METHOD OF TEST FOR RADIO INFLUENCE VOLTAGE (RIV)</text>
<bookmark index='165'>
<pageno>47</pageno>
<text>J1 ARRANGEMENT.</text>
</bookmark>
<bookmark index='166'>
<pageno>47</pageno>
<text>J2 TEST EQUIPMENT.</text>
</bookmark>
<bookmark index='167'>
<pageno>47</pageno>
<text>J3 TEST PROCEDURE.</text>
</bookmark>
</bookmark>
<bookmark index='168'>
<pageno>49</pageno>
<text>APPENDIX K - RESIDUAL VOLTAGE WINDINGS</text>
</bookmark>
<bookmark index='169'>
<pageno>51</pageno>
<text>APPENDIX L - ACCURACY TESTS ON THREE-PHASE VTs (including three-phase groups of single-phase VTs)</text>
<bookmark index='170'>
<pageno>51</pageno>
<text>L1 CATEGORY A PERFORMANCE VTs.</text>
</bookmark>
<bookmark index='171'>
<pageno>51</pageno>
<text>L2 CATEGORY B PERFORMANCE VTs.</text>
</bookmark>
<bookmark index='172'>
<pageno>52</pageno>
<text>L3 VTs WITH RESIDUALLY-CONNECTED SECONDARY WINDINGS.</text>
</bookmark>
</bookmark>
<bookmark index='173'>
<pageno>57</pageno>
<text>APPENDIX M - SYSTEM VOLTAGES UNDER UNSYMMETRICAL CONDITIONS</text>
</bookmark>
<bookmark index='174'>
<pageno>59</pageno>
<text>APPENDIX N - INFORMATION TO BE SUPPLIED WITH ENQUIRY AND ORDER</text>
</bookmark>
<bookmark index='175'>
<pageno>60</pageno>
<text>APPENDIX O - ALPHABETICAL INDEX OF DEFINED TERMS</text>
</bookmark>
</bookmark>
</bookmarktable>
</toc>

Abstract

Specifies general requirements and tests for all types of VTs and, in separate sections, specific requirements for single-phase VTs, for CVTs, for three-phase VTs and for Designation L VTs. Deals specifically with accuracy and short-term and long-term overvoltage ratings and applies the rated voltage factor to the VT as an entity, as well as to individual secondary windings. Primary windings are classified as 'uniformly insulated' or 'non-uniformly insulated'. Categories of performance (A and B) are specified for three-phase VTs only. Includes many explanatory appendices and enlarges on the determination of primary and secondary currents and of temperature coefficients of error, and on the determination of errors under different conditions.

Scope

This standard specifies requirements for voltage transformers for use with electrical measuring instruments and electrical protection devices such as are covered, in general, by the following Australian standards:
AS 1284 Electricity Meters
AS 1024 Direct Recording Electrical Measuring Instruments and Their Accessories
AS 1042 Direct-acting Indicating Electrical Measuring Instruments and Their Accessories
AS 1384 Transducers for Electrical Measurements
AS 2481 All-or-nothing Electrical Relays.
NOTES:
1. Throughout this standard, the words 'voltage transformer' are abbreviated to VT and 'capacitor voltage transformer' to CVT. (The plurals are VTs and CVTs respectively.)
2. In order to facilitate the specification and purchase of VTs, the standard also lists information which should be supplied with enquiry and order (see Appendix N).
3. Particular attention is drawn to the Foreword to AS 1384 concerning possible peculiarities in the burdens imposed on VTs by certain transducers.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	EL-013
Under Revision	DR 03344 CP DR 03345 CP
Supersedes	DR 80158
Superseded By	AS 60044.5-2004 (R2016) AS 60044.2-2003