IEEE C57.116-2022

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IEEE Guide for Transformers Directly Connected to Generators (Approved Draft)

Published By	Publication Date	Number of Pages
IEEE	2022

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Description

Revision Standard – Active. Information on the selection and application considerations for the unit power transformer and unit auxiliary power transformer is provided in this guide. Consideration is given to connections that include direct connection and connections through generator circuit breakers and load-break switches. The considerations referred to in this guide apply to hydroelectric and thermal electric generating stations. Various power transformer connections and possible operating problems under normal and abnormal conditions are treated. Phasing procedures, basic impulse insulation level selection, and loading practices are not covered.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C57.116™-2022 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
13	1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage
14	2. Normative references 3. Definitions, acronyms, and abbreviations 3.1 Definitions
15	4. Background
17	5. Transformer connections 5.1 Unit transformer connections 5.2 Unit auxiliary transformer connection
18	5.3 Unit transformer and unit auxiliary transformer external connections 6. Selection of parameters of unit transformer 6.1 Overview 6.2 Generator bus electrical characteristics
22	6.3 Transmission system electrical characteristics 6.4 Evaluation of parameters for unit transformers
32	6.5 Summary of parameter selection
33	6.6 Spare, leased or alternative unit transformer 7. Selection of parameters of unit auxiliary transformer 7.1 Overview 7.2 DETC voltage rating and tap range 7.3 Impedance
34	7.4 Megavoltampere rating 7.5 Phase relationship 7.6 Unit auxiliary transformer loading 7.7 Special considerations for three-winding unit auxiliary transformers
36	8. Transformer overcurrent considerations 8.1 Unit transformer faults 8.2 Unit auxiliary transformer faults
39	8.3 Fast load transfer—mechanical considerations
43	9. Load tap changing considerations 9.1 Overview 9.2 Load tap changing equipment
44	9.3 Duty considerations 9.4 Specifications 10. Transformers with isolated phase-bus duct connections
45	11. UT transformers operated in back-feed configuration 11.1 General
46	11.2 Special transformer considerations
47	11.3 Protective relaying considerations
48	11.4 Surge protection considerations
49	Annex A (normative) Considerations for specifying transformers directly connected to generators A.1 General A.2 XV and HV voltage ratings A.3 Back-feed possibilities
50	A.4 Iso-phase or segregated-phase bus and bus duct design and dimensions A.5 Foundation and firewall design information
51	A.6 Required special tests and information
52	Annex B (normative) Volts per hertz (V/Hz) considerations B.1 Short-term overexcitation in power transformers B.2 Relay practices B.3 Effects of short-term overexcitation on power transformers
53	B.4 V/Hz curves B.5 V/Hz curve criteria
55	Annex C (informative) Bibliography
57	Back cover