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