IEEE C57.12.91-2020

$63.38

IEEE Standard Test Code for Dry-Type Distribution and Power Transformers

Published By	Publication Date	Number of Pages
IEEE	2020	102

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Description

Revision Standard – Active. To reflect current practice in the testing procedures of dry-type transformers, substantive changes to Clause 5, Clause 7, Clause 10, Clause 11, and Clause 13 of IEEE Std C57.12.91-2011 have been made in this revision. Also Annex B has been added to provide guidelines for converting test results measured at 60 Hz to the equivalent values at 50 Hz and vice versa. This revision does not address transformer requirements and specific test criteria; rather they are contained in appropriate standards such as IEEE Std C57.12.01 or in user specifications.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C57.12.91™-2020 Front cover
2	Title page
4	Notice and Disclaimer of Liability Concerning the Use of IEEE Standards Documents
7	Participants
9	Introduction
10	Contents
12	1. Overview 1.1 Scope 1.2 Purpose
13	1.3 Word usage 2. Normative references
14	3. Definitions 4. General 4.1 Test definitions 4.2 Test requirements
15	4.3 Test sequence 4.4 Instrumentation 5. Resistance measurements 5.1 General 5.2 Measurements
16	5.3 Determination of cold temperature
17	5.4 Conversion of resistance measurements 5.5 Resistance measurement methods
18	5.6 Resistance measurement connections and reporting
19	6. Polarity and phase-relation tests 6.1 General 6.2 Subtractive and additive polarity
21	6.3 Polarity tests—single-phase transformers
22	6.4 Polarity and phase-relation tests—polyphase transformers
25	7. Ratio test 7.1 General
26	7.2 Tolerances for ratio 7.3 Ratio test methods
28	8. Excitation losses and current 8.1 General
29	8.2 Excitation loss test
31	8.3 Waveform correction of excitation losses 8.4 Determination of excitation current
32	8.5 Frequency conversion of excitation losses and current 9. Load losses and impedance voltage 9.1 General 9.2 Factors affecting the values of load losses and impedance voltage
33	9.3 Tests for measuring load losses and impedance voltage
39	9.4 Calculation of load losses and impedance voltage from test data
41	9.5 Zero-phase-sequence impedance
43	10. Dielectric test 10.1 Factory dielectric tests
45	10.2 Dielectric tests in the field 10.3 Applied voltage tests
46	10.4 Induced voltage tests
47	10.5 Partial discharge tests
48	10.6 Impulse tests
52	10.7 Impulse tests on transformer neutrals 10.8 Detection of failure during impulse tests
53	10.9 Insulation-power-factor tests
54	10.10 Insulation-resistance tests
55	11. Temperature rise test 11.1 General
56	11.2 Ambient temperature measurements 11.3 Surface temperature measurements
57	11.4 Cold-resistance measurements 11.5 Hot-resistance measurements
58	11.6 Calculation of average winding temperature rise
59	11.7 Correction factors
60	11.8 Temperature rise test loading methods
66	12. Short-circuit tests 12.1 Scope
67	12.2 Short-circuit testing techniques
72	12.3 Test requirements 12.4 Test procedure
76	12.5 Failure detection techniques
77	12.6 Analysis of test results and visual inspection
80	12.7 Proof of satisfactory performance
81	12.8 Required information for transformer short-circuit test reports 13. Audible sound-level measurements 13.1 General
82	13.2 Instrumentation
83	13.3 Test conditions
84	13.4 Microphone positions 13.5 Sound pressure level measurements
89	13.6 Determination of audible sound level of a transformer 13.7 Presentation of results
92	14. Mechanical design tests 14.1 General 14.2 Components involved in lifting or moving 14.3 Tests of sealed dry-type transformers 15. Calculated data 15.1 Reference temperature
93	15.2 Total losses 15.3 Efficiency 15.4 Voltage regulation
94	16. Minimum information to be included in certified test data 16.1 General 16.2 Order data
95	16.3 Rating data 16.4 Test data 16.5 Calculated data 16.6 Certification statement and approval
96	Annex A (informative) Bibliography
97	Annex B (normative) 50/60 Hz frequency conversion of measured performance parameters
102	Back cover