IEEE C57.12.91-2001

$62.83

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

Published By	Publication Date	Number of Pages
IEEE	2001	83

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Description

Revision Standard – Superseded. This IEEE Standards product is part of the C57 family on Power Distribution and Regulating Transformers. Methods for performing tests specified in IEEE Std C57.12.01-1989 and other referenced standards applicable to dry-type distribution and power transformers are described. This standard is intended for use as a basis for performance, safety, and the proper testing of dry-type distribution and power transformers. This standard applies to all dry-type transformers except instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, and mine transformers.

PDF Catalog

PDF Pages	PDF Title
1	Title Page
3	Introduction Participants
5	CONTENTS
9	1. Scope 1.1 Purpose 1.2 Word usage 2. References
11	3. Definitions 4. General 4.1 Test definitions 4.2 Test requirements 4.3 Test sequence 4.4 Instrumentation
12	5. Resistance measurements 5.1 General 5.2 Determination of cold temperature 5.3 Conversion of resistance measurements
13	5.4 Resistance measurement methods
14	6. Polarity and phase-relation tests
15	6.1 Subtractive and additive polarity
16	6.2 Polarity tests—single-phase transformers
17	6.3 Polarity and phase-relation tests—polyphase transformers
20	7. Ratio tests 7.1 General
21	7.2 Tolerances for ratio 7.3 Ratio test methods
24	8. No-load losses and excitation current 8.1 General 8.2 No-load loss test
27	8.3 Waveform correction of no-load losses 8.4 Determination of excitation (no-load) current
28	9. Load losses and impedance voltage 9.1 General 9.2 Factors affecting the values of load losses and impedance voltage
29	9.3 Tests for measuring load losses and impedance voltage
35	9.4 Calculation of load losses and impedance voltage from test data
37	9.5 Zero-phase-sequence impedance
40	10. Dielectric tests 10.1 Factory dielectric tests
41	10.2 Dielectric tests in the field 10.3 Applied-voltage tests
42	10.4 Induced-voltage tests
43	10.5 Impulse tests
45	10.6 Impulse tests on transformer neutrals
46	10.7 Detection of failure during impulse test
47	10.8 Insulation-power-factor tests
48	10.9 Insulation-resistance tests
49	10.10 Partial discharge tests 11. Temperature test 11.1 General
50	11.2 Ambient temperature measurements 11.3 Surface temperature measurements 11.4 Cold-resistance measurements
51	11.5 Hot-resistance measurement 11.6 Calculation of average winding temperature rise
52	11.7 Correction factors
54	11.8 Temperature rise test loading methods
60	12. Short-circuit tests 12.1 Scope 12.2 Short-circuit testing techniques
66	12.3 Test requirements 12.4 Test procedure
70	12.5 Failure detection techniques
71	12.6 Analysis of test results and visual inspection
74	12.7 Proof of satisfactory performance
75	12.8 Required information for transformer short-circuit test reports 13. Audible sound-level measurements 13.1 General 13.2 Instrumentation
76	13.3 Test conditions
77	13.4 Microphone positions 13.5 Sound level measurements
78	13.6 Optional-frequency analysis measurements
79	14. Mechanical design tests 14.1 Components involved in lifting or moving 14.2 Tests of sealed dry-type transformers
80	15. Calculated data 15.1 Reference temperature 15.2 Total losses 15.3 Efficiency 15.4 Voltage regulation
81	16. Minimum information to be included in certified test data 16.1 Order data
82	16.2 Rating data 16.3 Test data 16.4 Calculated data 16.5 Certification statement and approval
83	Annex A—Bibliography