FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Service conditions
5 Requirements for on-load tap-changers
6 Requirements for motor drive mechanisms for on-load
tap-changers
7 Requirements for de-energized tap-changers
8 Requirements for motor drive mechanisms for de-energized
tap-changers
9 Nameplate
10 De-energized tap-changer warning label
11 Manufacturers operating instructions
Annex A (normative) - Supplementary information on switching
duty relating to resistor type tap-changers
Annex B (normative) - Supplementary information on switching
duty relating to reactor type tap-changers
Annex C (normative) - Method for determining the equivalent
temperature of the transition resistor using power
pulse current
Annex D (informative) - Simulated AC circuits for service
duty and breaking capacity tests
Annex E (informative) - Example of a synthetic test circuit
for service duty test of vacuum type tap-changers