IEEE C57.12.91 2012

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

Published By	Publication Date	Number of Pages
IEEE	2012	94

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Description

Revision Standard – Active. This revision addresses substantive changes to Clause 5, 10 and 11 This revision addresses substantive changes to Clause 5, Clause 10, and Clause 11 of IEEE Std C57.12.91-2001 to reflect current practice in the testing procedures of dry-type transformers. 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	Cover
3	Title page
6	Introduction Notice to users Laws and regulations Copyrights Updating of IEEE documents
7	Errata Interpretations Patents
8	Participants
10	Contents
13	Important notice 1. Overview 1.1 Scope 1.2 Purpose
14	2. Normative references 3. Definitions 4. General 4.1 Test definitions 4.2 Test requirements 4.3 Test sequence
15	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 Subtractive and additive polarity
21	6.2 Polarity tests—single-phase transformers
23	6.3 Polarity and phase-relation tests—polyphase transformers
26	7. Ratio tests 7.1 General
27	7.2 Tolerances for ratio 7.3 Ratio test methods
29	8. No-load losses and excitation current 8.1 General
30	8.2 No-load loss test
32	8.3 Waveform correction of no-load losses 8.4 Determination of excitation (no-load) current
33	9. Load losses and impedance voltage 9.1 General 9.2 Factors affecting the values of load losses and impedance voltage
34	9.3 Tests for measuring load losses and impedance voltage
41	9.4 Calculation of load losses and impedance voltage from test data
43	9.5 Zero-phase-sequence impedance
45	10. Dielectric tests 10.1 Factory dielectric tests
47	10.2 Dielectric tests in the field 10.3 Applied-voltage tests
48	10.4 Induced-voltage tests
49	10.5 Impulse tests
52	10.6 Impulse tests on transformer neutrals 10.7 Detection of failure during impulse test
53	10.8 Insulation-power-factor tests
54	10.9 Insulation-resistance tests
56	11. Temperature test 11.1 General 11.2 Ambient temperature measurements
57	11.3 Surface temperature measurements 11.4 Cold-resistance measurements 11.5 Hot-resistance measurement
58	11.6 Calculation of average winding temperature rise
59	11.7 Correction factors
61	11.8 Temperature rise test loading methods
67	12. Short-circuit tests 12.1 Scope 12.2 Short-circuit testing techniques
73	12.3 Test requirements
74	12.4 Test procedure
77	12.5 Failure detection techniques
79	12.6 Analysis of test results and visual inspection
82	12.7 Proof of satisfactory performance
83	12.8 Required information for transformer short-circuit test reports 13. Audible sound-level measurements 13.1 General
84	13.2 Instrumentation 13.3 Test conditions
85	13.4 Microphone positions
86	13.5 Sound level measurements 13.6 Optional-frequency analysis measurements
88	14. Mechanical design tests 14.1 Components involved in lifting or moving 14.2 Tests of sealed dry-type transformers
89	15. Calculated data 15.1 Reference temperature 15.2 Total losses 15.3 Efficiency 15.4 Voltage regulation
91	16. Minimum information to be included in certified test data 16.1 Order data 16.2 Rating data 16.3 Test data
92	16.4 Calculated data 16.5 Certification statement and approval
93	Annex A (informative) Bibliography