IEEE C57.131-1995

$76.92

IEEE Standard Requirements for Load Tap Changers

Published By	Publication Date	Number of Pages
IEEE	1995	46

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Description

New IEEE Standard – Superseded. Electrical and mechanical performance and test requirements for load tap changers installed in power transformers and voltage regulating transformers of all voltage and kVA ratings are covered.

PDF Catalog

PDF Pages	PDF Title
1	Title Page
3	Introduction Participants
5	CONTENTS
7	1. Overview 1.1 Scope 1.2 Purpose 2. References
8	3. Definitions
10	4. Service conditions 5. Rating 5.1 Rated characteristics 5.2 Interrelation between rated through current and rated step voltage 6. Design tests
11	6.1 Temperature rise of contacts 6.2 Switching tests
13	6.3 Short-circuit current test
14	6.4 Transition impedance test
15	6.5 Mechanical tests 6.6 Dielectric tests
19	7. Routine tests 7.1 Mechanical test 7.2 Sequence test 7.3 Auxiliary circuits insulation test 8. Nameplate
20	9. Test report 9.1 Design test report 9.2 Routine test report 10. Motor-drive mechanism 10.1 Temperature of motor-drive mechanism environment 10.2 Permissible variation of auxiliary supply 10.3 Design tests for motor-drive mechanisms
21	10.4 Routine tests for motor-drive mechanism 10.5 Nameplate for motor-drive mechanism
22	10.6 Test report for motor-drive mechanism
23	Annex A—Switching duty relating to load tap changers with resistor transition
27	Annex B—Switching duty relating to icad tap changers with reactor transition
36	Annex C—Method of determining the equivalent temperature of the transition resistor using power pulse currents
37	Annex D—Simulated circuits for service duty and breaking capacity tests for resistance-type LTCs
40	Annex E—Tutorial information on LTC application
46	Annex F—Bibliography