IEEE DRAFT C57.12.91 : D3 2000

1 Overview
      1.1 Scope
      1.2 Purpose
      1.3 Word usage
2 References
3 Definitions
4 General
      4.1 Test definitions
      4.2 Test requirements
      4.3 Test sequence
      4.4 Instrumentation
5 Resistance measurements
      5.1 General
      5.2 Determination of cold temperature
      5.3 Conversion of resistance measurements
      5.4 Resistance measurement methods
6 Polarity and phase-relation tests
      6.1 Subtractive and additive polarity
      6.2 Polarity tests - Single-phase transformers
      6.3 Polarity and phase-relation tests - Polyphase
             transformers
7 Ratio tests
      7.1 General
      7.2 Tolerances for ratio
      7.3 Ratio test methods
8 No-load losses and excitation current
      8.1 General
      8.2 No-load loss test
      8.3 Waveform correction of no-load losses
      8.4 Determination of excitation (no-load) current
9 Load losses and impedance voltage
      9.1 General
      9.2 Factors affecting the values of load losses and
             impedance voltage
      9.3 Tests for measuring load losses and impedance
             voltage
      9.4 Calculation of load losses and impedance voltage
             from test data
      9.5 Zero-phase-sequence impedance
10 Dielectric tests
      10.1 Factory dielectric tests
      10.2 Dielectric tests in the field
      10.3 Applied-Voltage tests
      10.4 Induced-voltage tests
      10.5 Impulse tests
      10.6 Impulse tests on transformer neutrals
      10.7 Detection of failure during impulse test
      10.8 Insulation-power-factor tests
      10.9 Insulation-resistance tests
      10.10 partial discharge tests
11 Temperature test
      11.1 General
      11.2 Ambient temperature measurements
      11.3 Surface temperature measurements
      11.4 Cold-resistance measurements
      11.5 Hot-resistance measurement
      11.6 Calculation of average winding temperature rise
      11.7 Correction factors
      11.8 Temperature rise test loading methods
12 Short-circuit tests
      12.1 Scope
      12.2 Short-circuit testing techniques
      12.3 Test requirements
      12.4 Test procedure
      12.5 Failure detection techniques
      12.6 Analysis of test results and visual inspection
      12.7 Proof of satisfactory performance
      12.8 Required information for transformer short-
             circuit test reports
13 Audible sound-level measurements
      13.1 General
      13.2 Instrumentation
      13.3 Test conditions
      13.4 Microphone positions
      13.5 Sound level measurements
      13.6 Optional-frequency analysis measurements
14 Mechanical design tests
      14.1 Components involved in lifting or moving
      14.2 Tests of sealed dry-type transformers
15 Calculated data
      15.1 Reference temperature
      15.2 Total losses
      15.3 Efficiency
      15.4 Voltage regulation
16 Minimum information to be included in certified test
      data
      16.1 Order data
      16.2 Rating data
      16.3 Test data
      16.4 Calculated data
      16.5 Certification statement and approval
Annex A - Bibliography

Describes methods for performing tests specified in IEEE Std C57.12.01-1989 and other referenced standards applicable to dry-type distribution and power transformers. It is meant for use as a basis for performance, safety and the proper testing of dry-type distribution and power transformers.