• 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

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    Published date:  04-07-2008

    Publisher:  European Committee for Standards - Electrical

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    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    Describes 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.

    General Product Information - (Show below) - (Hide below)

    Committee TC 14
    Document Type Technical Report
    Publisher European Committee for Standards - Electrical
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    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 (published 2016-01) 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 (IEC/TS 60076-19:2013, MODIFIED)

    Standards Referencing This Book - (Show below) - (Hide below)

    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 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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