IEC 60186:1987

FOREWORD
PREFACE
CHAPTER I: GENERAL REQUIREMENTS APPLICABLE TO ALL VOLTAGE
           TRANSFORMERS
SECTION ONE - GENERAL
Clause
1 Scope
2 General requirements
3 Service conditions
4 Definitions
SECTION TWO - RATING AND PERFORMANCE REQUIREMENTS APPLICABLE TO
              ALL VOLTAGE TRANSFORMERS
5 Standard values of rated voltages
6 Standard values of rated output
7 Standard values of rated voltage factor
8 Limits of temperature rise
9 Insulation requirements
9a Short-circuit withstand capability
SECTION THREE - TESTS - GENERAL
10 Classification of tests
SECTION FOUR - TYPE TESTS
11 Temperature-rise test
12 Short-circuit withstand capability test
13 Impulse tests on primary winding
14 Wet test for outdoor type transformers
SECTION FIVE - ROUTING TESTS
15 Verification of terminal markings
16 Power-frequency tests on primary windings and measurement of
    partial discharges
17 Power-frequency tests between sections and on secondary
    windings
SECTION SIX - SPECIAL TESTS
18 Chopped lightning-impulse test on primary windings
SECTION SEVEN - MARKING
19 Rating plate markings
SECTION EIGHT - TERMINAL MARKINGS
20 General
21 Markings
CHAPTER II: ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE MEASURING
            VOLTAGE TRANSFORMERS
SECTION NINE - GENERAL
22 Scope
23 Definitions
SECTION TEN - ACCURACY REQUIREMENTS
24 Accuracy class designation
25 Limits of voltage error and phase displacement
SECTION ELEVEN - TESTS FOR ACCURACY
26 Type tests
26a Routing tests
SECTION TWELVE - MARKING
27 Marking of the rating plate of a measuring voltage
    transformer
SECTION THIRTEEN - GENERAL
28 Scope
29 Definitions
SECTION FOURTEEN - ACCURACY REQUIREMENTS
30 Accuracy class designation
31 Limits of voltage error and phase displacement
SECTION FIFTEEN - REQUIREMENTS FOR SECONDARY WINDINGS INTENDED
                  TO PRODUCE A RESIDUAL VOLTAGE
32 Rated secondary voltages
33 Rated output
34 Accuracy class
SECTION SIXTEEN - TESTS FOR ACCURACY
35 Type tests
36 Routine tests
SECTION SEVENTEEN - MARKING
37 Marking of the rating plate of a protective voltage
    transformer
CHAPTER IV: ADDITIONAL REQUIREMENTS FOR CAPACITOR VOLTAGE
            TRANSFORMERS
SECTION EIGHTEEN - GENERAL
38 Scope
39 General requirements
40 Definitions
SECTION NINETEEN - RATING AND PERFORMANCE REQUIREMENTS
41 Standard reference range of frequency
42 Standard values of rated output
SECTION TWENTY - ACCURACY REQUIREMENTS
43 Standard accuracy classes
44 Limits of voltage error and phase displacement
SECTION TWENTY-ONE - EFFECTS OF TRANSIENTS
45 Ferro-resonance
46 Transient response
SECTION TWENTY-TWO - COUPLING DEVICE
47 Carrier-frequency coupling device
SECTION TWENTY-THREE - TESTS
48 General
SECTION TWENTY-FOUR - TYPE TESTS
49 Temperature-rise test
50 Impulse tests
51 Ferro-resonance tests
52 Transient response tests
53 Tests for accuracy
SECTION TWENTY-FIVE - ROUTING TESTS
54 Power-frequency tests
55 Tests for accuracy
SECTION TWENTY-SIX - MARKING
56 Marking of the rating plate of a capacitor voltage
    transformer
FIGURES
APPENDIX A - Typical and equivalent diagrams for a capacitor
             voltage transformer
APPENDIX B - Main condition allowing tests on the equivalent
             circuit
APPENDIX C - Burdens for the transient response test
APPENDIX D - Use of the equivalent circuit for the routing tests
             for accuracy

Applies to new voltage transformers for use with electricalmeasuring instruments and electrical protective devices atfrequencies from 15 Hz to 100 Hz.The general requirements apply to all voltage transformers, but,for certain types, e.g. capacitor voltage transformers, therequirements are subject to the modifications stated in theappropriate chapter. Although the requirements relate basically totransformers with separate windings, they are also applicable,where appropriate, to autotransformers. The standard does not applyto transformers for use in laboratories.The requirements for inductive voltage transformers are supersededby IEC 60044-2 (1997).