IEEE C57.12.90 2007

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IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers

Published By	Publication Date	Number of Pages
IEEE	2007	94

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Description

Revision Standard – Inactive – Superseded. Methods for performing tests specified in IEEE Std C57.12.00TM-2006 and other standards applicable to liquid-immersed distribution, power, and regulating transformers are described. Instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, grounding transformers, and mine transformers are excluded. This standard covers resistance measurements, polarity and phaserelation tests, ratio tests, no-load-loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, short-circuit tests, audible sound level measurements, calculated data, and certified test data.

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PDF Pages	PDF Title
1	IEEE Std C57.12.90-2006, IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers
3	Title page
6	Introduction Notice to users Errata
7	Interpretations Patents Participants
11	CONTENTS
13	1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage
14	2. Normative references
15	3. Definitions
16	4. General 4.1 Types of tests 4.2 Test requirements 4.3 Test sequence 4.4 Instrumentation
17	5. Resistance measurements 5.1 Determination of cold temperature 5.2 Conversion of resistance measurements
18	5.3 Resistance measurement methods
19	6. Polarity and phase-relation tests 6.1 Subtractive and additive polarity
21	6.2 Polarity tests: single-phase transformers
22	6.3 Polarity and phase-relation tests: polyphase transformers
25	7. Ratio tests 7.1 General
26	7.2 Tolerances for ratio 7.3 Ratio test methods
28	8. No-load losses and excitation current 8.1 General 8.2 No-load loss test
31	8.3 Waveform correction of no-load losses 8.4 Temperature correction of no-load losses
32	8.5 Determination of excitation (no-load) current 9. Load losses and impedance voltage 9.1 General
33	9.2 Factors affecting the values of load losses and impedance voltage 9.3 Tests for measuring load losses and impedance voltage
40	9.4 Calculation of load losses and impedance voltage from test data
42	9.5 Zero-phase-sequence impedance
45	10. Dielectric tests 10.1 General
47	10.2 Switching impulse test procedures
48	10.3 Lightning impulse test procedures
52	10.4 Routine impulse test for distribution transformers
55	10.5 Low-frequency tests 10.6 Applied voltage tests 10.7 Induced voltage tests for distribution and Class I power transformers
56	10.8 Induced voltage test for Class II power transformers
58	10.9 Partial discharge measurement 10.10 Insulation power-factor tests
61	10.11 Insulation resistance tests
62	11. Temperature-rise tests
63	11.1 Test methods
65	11.2 Resistance measurements
66	11.3 Temperature measurements
69	11.4 Correction of temperature rise test results
70	12. Short-circuit tests 12.1 General
71	12.2 Test connections
72	12.3 Test requirements
73	12.4 Test procedure
74	12.5 Proof of satisfactory performance
76	13. Audible sound emissions 13.1 General 13.2 Instrumentation
77	13.3 Test conditions
78	13.4 Microphone positions
80	13.5 Sound power rating
83	13.6 Presentation of results
89	14. Calculated data 14.1 Reference temperature 14.2 Losses and excitation current 14.3 Efficiency 14.4 Voltage regulation of a constant-voltage transformer
92	Annex A (informative) Partial discharge measurement using radio-influence voltage instrumentation and its failure detection
94	Annex B (informative) Bibliography

Additional information

Standard Title	IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers
Published Code	IEEE
Publication Date	2007
Pages Count	94

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IEEE C57.12.90 2007

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