ISA T 2000 - Table of Contents

DOC. MIE11110 Rev. 5
Page
3
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110
SHORT FOREWORD....................................................................................................... 4
SAFETY AT WORK............................................................................................................ 5
INTRODUCTION ................................................................................................................ 9
1 TRANSFORMER TESTS APPLICATION EXAMPLES ............................................10
1.1 CURRENT TRANSFORMER TESTS ....................................................................... 11
1 .1.1. CT tests : ratio, polarity voltage mode .............................11
1 .1.2. CT tests : ratio, polarity and burden ...................................16
1 .1.3. CT tests : ratio, polarity with booster ................................21
1 .1.4. CT tests : burden, secondary side ........................................36
1 .1.5. CT tests : excitation curve ..........................................................39
1 .1.6. CT tests : winding or burden resistance ...........................47
1 .1.7. CT tests : voltage withstand .....................................................50
1 .1.8. CT tests : polarity by impulses................................................54
1.2: VOLTAGE TRANSFORMERS TESTS .................................................................. 57
1.2.1: VT tests: ratio and polarity ..........................................................57
1.2.2: VT tests: burden, secondary side ...........................................61
1.2.3: VT tests: ratio, electronic transformers .............................63
1.2.4: VT tests: voltage withstand ........................................................64
1.2.5: VT tests: secondary over-current protection.................66
1.3: POWER TRANSFORMERS TESTS ...................................................................... 68
1.3.1: PT tests: ratio per TAP .....................................................................68
1.3.2: PT tests: resistance of LTC contacts .....................................72
1.3.3: PT tests: dynamic LTC test ..........................................................76
1.3.4 PT tests: PT ratio test ........................................................................84
2 RESISTANCE TESTS .......................................................................................................86
2.1 MICROOHMMETER .................................................................................................. 86
2.2 EARTH RESISTANCE .............................................................................................. 90
2.3 SOIL RESISTIVITY.................................................................................................. 95
3 LINE IMPEDANCE TESTS ..............................................................................................99
3.1 LINE IMPEDANCE MEASUREMENT ...................................................................... 99
3.2 EARTH IMPEDANCE MEASUREMENT ................................................................ 101
3.3 MUTUAL FACTOR MEASUREMENT..................................................................... 103
APPENDIX: DYNAMIC TAP CHANGER TESTING ................................................... 107