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IEEE C57.119 2002

$42.25

IEEE Recommended Practice for Performing Temperature Rise Tests on Oil-Immersed Power Transformers at Loads Beyond Nameplate Ratings

Published By Publication Date Number of Pages
IEEE 2002 47
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New IEEE Standard – Active. Reaffirmed 2008. Recommendations are made, where possible, regarding the performance and evaluation of temperature rise tests on oil-immersed power transformers beyond nameplate ratings. The intent is to assist power transformer manufacturers, and the ultimate users, in evaluating thermal performance of the transformers under varying loads.

PDF Catalog

PDF Pages PDF Title
2 Title Page
4 Introduction
5 Participants
7 CONTENTS
10 1. Overview
1.1 Scope
1.2 Purpose
11 2. References
12 3. Definitions and symbols
3.1 Definitions
13 3.2 Symbols
16 4. General
4.1 Preliminary evaluation
4.2 Cooling equipment operation
5. Precautions
17 5.1 Thermal degradation
5.2 Other factors limiting loading
5.3 Monitoring of test results
18 5.4 Maximum temperatures
6. Monitored data
6.1 Ambient air temperature
6.2 Oil temperatures
6.3 Other temperatures
6.4 Currents
7. Recorded data
7.1 Losses
19 7.2 Temperature indicator readings
7.3 Tank surface and other temperatures
7.4 Oil levels
8. Oil samples
9. Test procedure for determining the thermal characteristics of oil-immersed power transformers
20 9.1 Tap position and connection
9.2 Number of tests
9.3 Applied test currents
9.4 Discontinued tests
21 9.5 Temperature rise test at rated load
9.6 Temperature rise test at reduced load
22 9.7 Temperature rise test at load beyond nameplate rating
9.8 Evaluation of thermal data
25 9.9 Evaluation of other data
10. Test procedure for performing load cycle temperature rise tests
10.1 Recommended prior tests
10.2 Information specified by user
26 10.3 Determination of load cycle
27 10.4 Preparatory calculations
10.5 Data recorded
10.6 Test procedure
28 10.7 Interrupted test
29 10.8 Assessment of transformer performance
11. Integrated test procedure for determining thermal characteristics and for performing load cyc…
11.1 Load cycle simulation
11.2 Preliminary evaluation
30 11.3 Test procedure
11.4 Initial test
11.5 Conditioning load
11.6 Beyond maximum nameplate test
11.7 Final test
31 Annex A
(normative)
Loading guide equations
33 Annex B
(informative)
Tutorial
44 Annex C
(informative)
Hottest spot measurements using direct reading •ber optics
temperature measurements
46 Annex D
(informative)
Bibliography
IEEE C57.119 2002
$42.25