IEEE DRAFT C57.12.91 : D3 2000
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
21-10-2023
12-01-2013
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
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