ДСТУ CLC/TR 50462:2022 Правила визначення невизначеностей під час вимірювання втрат на силових трансформаторах і реакторах (CLC/TR 50462:2008, IDT)



ДСТУ CLC/TR 50462:2022
(CLC/TR 50462:2008, IDT)

Правила визначення невизначеностей під час
вимірювання втрат на силових трансформаторах і реакторах

 
   
 
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

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 P2 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 0 at load loss test

10.8 Winding resistance

Annex A (informative) Example of load loss uncertainty evaluation for a large power transformer

Annex В (informative) Example of load loss uncertainty evaluation for a distribution transformer

Annex C (informative) General rules for the uncertainty estimate

Annex D (informative) Sensitivity coefficients for uncertainty contributions due to phase displacement correction of measurements at low power factor

Annex E (informative) Model function for load loss temperature correction

Annex F (informative) Measurement of winding resistance

Bibliography