IEEE C57.116 2014

$37.38

IEEE Guide for Transformers Directly Connected to Generators

Published By	Publication Date	Number of Pages
IEEE	2014	48

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Description

Revision Standard – Active. Information on the selection and application considerations for the unit power transformer and unit auxiliaries 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™-2014 front cover
3	Title page
5	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
13	IMPORTANT NOTICE 1. Overview 1.1 Scope 1.2 Purpose
14	2. Normative references 3. Definitions
15	4. Background
17	5. Transformer connections 5.1 Unit transformer connections 5.2 Unit auxiliaries transformer connection
18	5.3 Unit transformer and unit auxiliaries transformer external connections 6. Selection of parameters of unit transformer 6.1 Generator bus electrical characteristics 6.1.1 Generator capability curve
20	6.1.2 Turbine limit 6.1.3 Excitation limiters
21	6.1.4 Impact of UAT selection on UT loading 6.1.5 Unit stability
22	6.2 Transmission system electrical characteristics 6.2.1 Voltage 6.2.2 Reactive power 6.3 Evaluation of parameters for unit transformers
25	6.3.1 Highest high-voltage winding tap voltage rating 6.3.2 Impedance
26	6.3.3 Transformation ratio
27	6.3.4 Megavoltampere rating
28	6.3.5 Lower high-voltage winding tap voltage ratings 6.3.6 Winding current rating
29	6.3.7 Overexcitation
30	6.4 Summary of parameter selection
31	6.5 Spare, leased or alternative unit transformer
32	7. Selection of parameters of unit auxiliaries transformer
33	7.1 DETC voltage rating and tap range 7.2 Impedance 7.3 Megavoltampere rating 7.4 Phase relationship
34	7.5 Unit auxiliaries transformer loading 8. Transformer overcurrent considerations 8.1 Unit transformer faults 8.2 Unit auxiliaries transformer faults
37	8.3 Fast load transfer—mechanical considerations
41	9. Load tap changing considerations 9.1 Load tap changing equipment
42	9.2 Duty considerations 9.3 Specifications 10. Transformers with isolated phase-bus duct connections
43	11. UT transformers operated in back-feed configuration
44	11.1 Special transformer considerations
45	11.2 Protective relaying considerations
46	11.3 Surge protection considerations
47	Annex A (informative)Bibliography