IEEE C57.12.90-2015

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

Published By	Publication Date	Number of Pages
IEEE	2015

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Description

Revision Standard – Active. Methods for performing tests specified in IEEE Std C57.12.00(TM) 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. Resistance measurements, polarity and phase-relation 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, and calculated data are covered in this standard.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C57.12.90™-2015 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
14	1.2 Purpose 1.3 Word usage 2. Normative references
15	3. Definitions
16	4. General 4.1 Types of tests 4.2 Test requirements 4.3 Test sequence
17	4.4 Instrumentation 5. Resistance measurements 5.1 Determination of cold temperature
18	5.2 Conversion of resistance measurements 5.3 Resistance measurement methods
19	5.4 Resistance measurement connections and reporting
20	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
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 8.2 No-load loss test
32	8.3 Waveform correction of no-load losses 8.4 Temperature correction of no-load losses
33	8.5 Determination of excitation (no-load) current 8.6 Frequency conversion of no-load losses and excitation current 9. Load losses and impedance voltage 9.1 General
34	9.2 Factors affecting the values of load losses and impedance voltage
35	9.3 Tests for measuring load losses and impedance voltage
42	9.4 Calculation of load losses and impedance voltage from test data
45	9.5 Zero-phase-sequence impedance
49	10. Dielectric tests 10.1 General
52	10.2 Switching impulse test procedures
53	10.3 Lightning impulse test procedures
61	10.4 Routine impulse test for distribution transformers
63	10.5 Low-frequency tests
64	10.6 Applied-voltage tests 10.7 Induced-voltage tests for distribution and Class I power transformers
65	10.8 Induced-voltage test for Class II power transformers
66	10.9 Partial discharge measurement
67	10.10 Insulation power-factor tests
68	10.11 Insulation resistance tests
70	11. Temperature-rise tests 11.1 Test methods
73	11.2 Resistance measurements
75	11.3 Temperature measurements
77	11.4 Correction of temperature-rise test results
79	12. Short-circuit tests 12.1 General
80	12.2 Test connections
83	12.3 Test requirements
84	12.4 Test procedure
85	12.5 Proof of satisfactory performance
87	13. Audible sound emissions 13.1 General
88	13.2 Instrumentation
89	13.3 Test conditions
91	13.4 Microphone positions
92	13.5 Sound pressure level measurements
96	13.6 Determination of audible sound level of a transformer
99	13.7 Presentation of results
102	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
105	Annex A (informative) Partial discharge measurement using radio-influence voltage instrumentation and its failure detection A.1 Partial discharge measurement
106	A.2 Failure detection
107	Annex B (normative) 50/60-Hz frequency conversion of measured performance parameters B.1 No-load loss and excitation current
108	B.2 Load loss
109	B.3 Temperature-rise test
111	B.4 Short-circuit test B.5 Audible sound
114	Annex C (informative) Connections diagrams for short-circuit testing of a three-phase transformer using single-phase source as an alternative (see 12.2.1.2)
117	Annex D (informative) Bibliography
120	Back Cover