IEEE C57.119-2001

1 Overview
   1.1 Scope
   1.2 Purpose
2 References
3 Definitions and symbols
   3.1 Definitions
   3.2 Symbols
4 General
   4.1 Preliminary evaluation
   4.2 Cooling equipment operation
5 Precautions
   5.1 Thermal degradation
   5.2 Other factors limiting loading
   5.3 Monitoring of test results
   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
   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
   9.1 Tap position and connection
   9.2 Number of tests
   9.3 Applied test currents
   9.4 Discontinued tests
   9.5 Temperature rise test at rated load
   9.6 Temperature rise test at reduced load
   9.7 Temperature rise test at load beyond nameplate rating
   9.8 Evaluation of thermal data
   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
   10.3 Determination of load cycle
   10.4 Preparatory calculations
   10.5 Data recorded
   10.6 Test procedure
   10.7 Interrupted test
   10.8 Assessment of transformer performance
11 Integrated test procedure for determining thermal characteristics
   and for performing load cycle temperature rise tests
   11.1 Load cycle simulation
   11.2 Preliminary evaluation
   11.3 Test procedure
   11.4 Initial test
   11.5 Conditioning load
   11.6 Beyond maximum nameplate test
   11.7 Final test
Annex A (normative) Loading guide equations
Annex B (informative) Tutorial
Annex C (informative) Hottest spot measurements using direct reading
        fiber optics temperature measurements
Annex D (informative) Bibliography

Covers temperature rise test procedures for determining those thermal characteristics of power transformers needed to appraise the transformer's load carrying capabilities at specific loading conditions other than rated load.