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eLibrary > 23/30479106 DC BS IEC/IEEE 61869-21 Instrument transformers - Part 21. Uncertainty evaluation in the calibration of Instrument Transformers >

23/30479106 DC BS IEC/IEEE 61869-21 Instrument transformers - Part 21. Uncertainty evaluation in the calibration of Instrument Transformers, 2023

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23/30479106 DC BS IEC/IEEE 61869-21 Instrument transformers - Part 21. Uncertainty evaluation in the calibration of Instrument Transformers, 2023

38_756e_CDV.pdf [Go to Page]
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols [Go to Page]
3.1 General definitions
3.2 Definitions related to measuring devices
3.3 Abbreviated terms
3.4 Symbols
4 Sources of uncertainty in a system for accuracy test [Go to Page]
4.1 Reference IT
4.2 Comparator
4.3 Burden
4.4 Voltage/current source
4.5 General considerations on other sources of uncertainties arising in accuracy test setups
4.6 Sources of uncertainty in special applications
5 Requirements [Go to Page]
5.1 Reference IT
5.2 Comparator
5.3 Burden
5.4 Voltage/current source
5.5 Special applications
6 On-site accuracy test or verification of ITs [Go to Page]
6.1 Purpose of on-site accuracy test or verification
6.2 Interval of on-site accuracy test or verification
6.3 Requirements and sources of uncertainty
7 Procedures for accuracy tests of ITs [Go to Page]
7.1 Overview
7.2 Methods to evaluate errors of ITs with digital comparators
7.3 Connections in the accuracy test setup
7.4 Burden connection
7.5 Demagnetization of inductive CTs
7.6 Selection of the time acquisition interval
7.7 Selection of the sampling frequency
7.8 Procedure for applying the Type A method in uncertainty evaluation
7.9 Procedures for on-site accuracy tests of ITs
7.10 Evaluation of uncertainty affecting the measurement of IT errors [Go to Page]
7.10.1 General
7.10.2 Preparation of the equations for the measurement model
7.10.3 Definition of the measurement model
7.10.4 Contributions from calibration or conformity certificates [Go to Page]
7.10.4.1 Contributions from calibration certificates
7.10.4.2 Contributions from conformity certificates
7.10.5 Preparation of the tables for calculating the uncertainty budget
7.11 Procedures in special applications
Annex A (informative) Calculation of the expanded uncertainty in accuracy tests of ITs [Go to Page]
A.1 Example of calculation of an uncertainty budget [Go to Page]
A.1.1 Contributions from calibration certificates
A.1.2 Setup- and DUT-specific contributions
A.1.3 Fluctuations of the comparator readings
A.1.4 Calculation of the expanded uncertainty
Bibliography [Go to Page]

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23/30479106 DC BS IEC/IEEE 61869-21 Instrument transformers - Part 21. Uncertainty evaluation in the calibration of Instrument Transformers, 2023

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