CLC/TR 50462:2008
Current
The latest, up-to-date edition.
Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors
04-07-2008
Introduction
1 Scope
2 Normative references
3 Definitions
4 Symbols
4.1 General symbols
4.2 Symbols for uncertainty
5 Power measurement, systematic deviation and uncertainty
6 Procedures for no-load loss
6.1 General
6.2 Model function for no-load losses at reference conditions
6.3 Uncertainty budget
7 Procedures for load loss
7.1 General
7.2 Model function for load loss at reference conditions
7.3 Uncertainty budget for measured power P[2] referred to
rated current
7.4 Uncertainty budget for reported load loss
8 Three-phase calculations
8.1 Power
8.2 Reference voltage (current)
9 Reporting
9.1 Uncertainty
9.2 Traceability
10 Estimation of corrections and uncertainty contributions
10.1 Ratio error of instrument transformers
10.2 Phase displacement of instrument transformers
10.3 Power meter
10.4 Voltage measurement in no-load loss
10.5 Ampere meter in load loss measurement
10.6 Correction to sinusoidal waveform
10.7 Winding temperature h at load loss test
10.8 Winding resistance
Annex A (informative) Example of load loss uncertainty evaluation
for a large power transformer
A.1 Introduction
A.2 Transformer rating
A.3 Measuring method and instrumentation used
A.4 Model of the measurand
A.5 Results of the measurements
A.6 Uncertainty of load loss
A.7 Estimates of the single contributions to the uncertainty
Annex B (informative) Example of load loss uncertainty evaluation
for a distribution transformer
B.1 Introduction
B.2 Transformer rating
B.3 Measuring instrumentation
B.4 Model of the measurand
B.5 Results of the measurements
B.6 Uncertainty of load loss
B.7 Estimate of the single contributions to the uncertainty
formation
Annex C (informative) General rules for the uncertainty estimate
C.1 The basic concepts
C.2 Measurements, estimates and uncertainties
C.3 Evaluation of the input quantity uncertainties
C.4 Evaluation and expression of the expanded uncertainty
Annex D (informative) Sensitivity coefficients for uncertainty
contributions due to phase displacement correction of
measurements at low power factor
D.1 Introduction
D.2 Sensitivity factors
Annex E (informative) Model function for load loss temperature
correction
E.1 General
E.2 Model function
E.3 Sensitivity coefficients
E.4 Estimation of temperature during load loss test
E.5 Simplified analysis
Annex F (informative) Measurement of winding resistance
F.1 Description of the measurement
F.2 Inductive voltage drop
Bibliography
This Technical Report illustrates the procedures and criteria to 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, the document can be also used for the measurements of reactor losses, when applicable.
Committee |
CLC/TC 14
|
DocumentType |
Technical Report
|
PublisherName |
European Committee for Standards - Electrical
|
Status |
Current
|
Standards | Relationship |
UNE-CLC/TR 50462:2009 | Identical |
NEN NPR CLC/TR 50462 : 2008 | Identical |
CEI CLC/TR 50462 : 2009 | Identical |
S.R. CLC/TR 50462:2008 | Identical |
EN 60076-2:2011 | Power transformers - Part 2: Temperature rise for liquid-immersed transformers |
I.S. EN 60076-2:2011 | POWER TRANSFORMERS - PART 2: TEMPERATURE RISE FOR LIQUID-IMMERSED TRANSFORMERS |
CEI EN 60076-2 : 2015 | POWER TRANSFORMERS - PART 2: TEMPERATURE RISE FOR LIQUID-IMMERSED TRANSFORMERS |
BS EN 60076-2:2011 | Power transformers Temperature rise for liquid-immersed transformers |
I.S. EN 60076-19:2015 | POWER TRANSFORMERS - PART 19: RULES FOR THE DETERMINATION OF UNCERTAINTIES IN THE MEASUREMENT OF THE LOSSES ON POWER TRANSFORMERS AND REACTORS |
UNE-EN 60076-19:2016 | Power transformers - Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors |
IEC 60076-2:2011 | Power transformers - Part 2: Temperature rise for liquid-immersed transformers |
UNE-EN 60076-2:2013 | Power transformers - Part 2: Temperature rise for liquid-immersed transformers |
BS EN 60076-19:2015 | Power transformers Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors |
EN 60076-19:2015 | Power transformers - Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors |
EN 60044-2:1999/A2:2003 | INSTRUMENT TRANSFORMERS - PART 2: INDUCTIVE VOLTAGE TRANSFORMERS |
ISO/IEC 17025:2005 | General requirements for the competence of testing and calibration laboratories |
ISO/IEC Guide 98:1993 | Guide to the expression of uncertainty in measurement (GUM) |
IEC 60044-2:1997+AMD1:2000+AMD2:2002 CSV | Instrument transformers - Part 2 : Inductive voltage transformers |
IEC 60044-1:1996+AMD1:2000+AMD2:2002 CSV | Instrument transformers - Part 1: Current transformers |
IEC 60076-1:2011 | Power transformers - Part 1: General |
IEEE C57.123-2010 REDLINE | IEEE Guide for Transformer Loss Measurement |
EN 60076-1:2011 | POWER TRANSFORMERS - PART 1: GENERAL (IEC 60076-1:2011) |
EN 60044-1:1999/A2:2003 | INSTRUMENT TRANSFORMERS - PART 1: CURRENT TRANSFORMERS |
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