IEC TS 60076-19:2013

Power transformers - Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors

IEC/TS 60076-19:2013, which is a Technical Specification, illustrates the procedures that should be applied to evaluate the uncertainty affecting the measurements of no-load and load losses during the routine tests on power transformers. Even if the attention is especially paid to the transformers, when applicable the specification can be also used for the measurements of reactor losses, except large reactors with very low power factor.

Transformateurs de puissance - Partie 19: Règles pour la détermination des incertitudes de mesure des pertes des transformateurs de puissance et bobines d'inductance

La CEI/TS 60076-19:2013, qui est une Spécification Technique, présente les procédures qu'il convient d'appliquer pour évaluer l'incertitude qui affecte les mesures des pertes à vide et des pertes dues à la charge lors d'essais individuels de série de transformateurs de puissance. Même si la présente spécification prête une attention particulière aux transformateurs, elle peut être également utilisée, le cas échéant, pour les mesures des pertes des bobines d'inductance, à l'exception des grandes bobines d'inductance à très faible facteur de puissance.

General Information

• Status: Published
• Publication Date: 21-Mar-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 14 - Power transformers
• Drafting Committee: PT 60076-19 - TC 14/PT 60076-19
• Current Stage: PPUB - Publication issued
• Start Date: 30-Jun-2013
• Completion Date: 22-Mar-2013

Standards Content (Sample)

IEC/TS 60076-19 ®
Edition 1.0 2013-03
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Power transformers –
Part 19: Rules for the determination of uncertainties in the measurement of the
losses on power transformers and reactors

Transformateurs de puissance –
Partie 19: Règles pour la détermination des incertitudes de mesure des pertes
des transformateurs de puissance et bobines d’inductance

IEC/TS 60076-19:2013
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IEC/TS 60076-19 ®
Edition 1.0 2013-03
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Power transformers –
Part 19: Rules for the determination of uncertainties in the measurement of the

losses on power transformers and reactors

Transformateurs de puissance –

Partie 19: Règles pour la détermination des incertitudes de mesure des pertes

des transformateurs de puissance et bobines d’inductance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 29.180 ISBN 978-2-83220-693-5

– 2 – TS 60076-19 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 8
4.1 General symbols . 8
4.2 Symbols for uncertainty . 9
5 Power measurement, systematic deviation and uncertainty . 10
5.1 General . 10
5.2 Model function . 10
5.3 Measuring systems . 10
6 Procedures for no-load loss measurement . 11
6.1 General . 11
6.2 Model function for no-load losses at reference conditions . 11
6.3 Uncertainty budget for no-load loss . 12
7 Procedures for load loss measurement . 13
7.1 General . 13
7.2 Model function for load loss measurement at rated current . 13
7.3 Reporting to rated current and reference temperature . 14
7.4 Uncertainty budget for the measured power P reported to rated current . 14
7.4.1 General . 14
7.4.2 Uncertainties of measured load loss power P at ambient temperature
θ . 14
7.5 Uncertainty budget for reported load loss at reference temperature . 15
8 Three-phase calculations . 16
8.1 Power measurement . 16
8.2 Reference voltage . 17
8.3 Reference current. 17
9 Reporting . 17
9.1 Uncertainty declaration . 17
9.2 Traceability . 17
10 Estimate of corrections and uncertainty contributions . 18
10.1 Instrument transformers . 18
10.2 Uncertainty contributions of ratio error of instrument transformers . 18
10.3 Uncertainty contribution of phase displacement of instrument transformers . 19
10.3.1 General . 19
10.3.2 Complete reference procedure . 19
10.3.3 Class index procedure . 20
10.4 Voltage and current measurements . 21
10.5 Power meter . 21
10.6 Correction to sinusoidal waveform . 22
10.7 Winding temperature at load loss measurement . 23
10.8 Winding resistance measurement . 23
Annex A (informative) Example of load loss uncertainty evaluation for a large power
transformer . 25

TS 60076-19 © IEC:2013 – 3 –
Annex B (Informative) Example of load loss uncertainty evaluation for a distribution
transformer . 33
Bibliography . 37

Table 1 – Measured no-load loss uncertainties . 12
Table 2 – Measured load loss uncertainties at ambient temperature . 15
Table 3 – Absolute uncertainty of the additional losses at temperature θ . 15
Table 4 – Absolute uncertainty of load losses P reported at reference temperature . 16
LL
Table 5 – Procedures for the determination of phase displacement uncertainties . 19
Table A.1 – Transformer ratings . 25
Table A.2 – Loss measurement results (one phase) . 27
Table A.3 – Calibration of voltage and current transformers . 27
Table A.4 – Uncertainty contributions. 29
Table B.1 – Transformer ratings . 33
Table B.2 – Measured quantities . 34
Table B.3 – Calibration of the current transformers . 35
Table B.4 – Uncertainty contribution . 36

– 4 – TS 60076-19 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 19: Rules for the determination of uncertainties in the
measurement of the losses on power transformers and reactors

FOREWORD
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interested IEC National Commit
...