Table of Contents

1. Overview
2. Normative references
3. Definitions
4. Service conditions
5. Requirements for LTCs
6. Requirements for motor-drive mechanisms for load
    tap changers
7. Requirements for de-energized tap changers (DETCs)
8. Requirements for motor-drive mechanisms for DETCs
9. Nameplate
10. Manufacturer's operating instructions
Annex A (informative) - Switching duty relating to load
        tap changers (LTCs) with resistor transition
Annex B (informative) - Switching duty relating to load
        tap changers (LTCs) with reactor transition
Annex C (informative) - Method of determining the equivalent
        temperature of the transition resistor using power
        pulse currents
Annex D (informative) - Simulated circuits for service duty
        and breaking capacity tests for resistance-type LTCs
Annex E (informative) - Tutorial information on LTC application
Annex F (informative) - Bibliography

Abstract

Specifies electrical and mechanical performance and test requirements for load tap changers and de-energized tap changers, installed in power transformers and voltage regulating transformers and immersed in transformer mineral oil.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT C57.131 : D9 JUN 94