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BSI 23/30479106 DC:2023 Edition

BSI 23/30479106 DC:2023 Edition

$13.70

BS IEC/IEEE 61869-21 Instrument transformers – Part 21. Uncertainty evaluation in the calibration of Instrument Transformers

Published By Publication Date Number of Pages
BSI 2023 40
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PDF Catalog

PDF Pages PDF Title
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
3.1 General definitions
15 3.2 Definitions related to measuring devices
16 3.3 Abbreviated terms
3.4 Symbols
4 Sources of uncertainty in a system for accuracy test
4.1 Reference IT
17 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
18 4.6 Sources of uncertainty in special applications
5 Requirements
5.1 Reference IT
19 5.2 Comparator
20 5.3 Burden
5.4 Voltage/current source
5.5 Special applications
6 On-site accuracy test or verification of ITs
6.1 Purpose of on-site accuracy test or verification
21 6.2 Interval of on-site accuracy test or verification
6.3 Requirements and sources of uncertainty
22 7 Procedures for accuracy tests of ITs
7.1 Overview
7.2 Methods to evaluate errors of ITs with digital comparators
25 7.3 Connections in the accuracy test setup
26 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
27 7.8 Procedure for applying the Type A method in uncertainty evaluation
7.9 Procedures for on-site accuracy tests of ITs
29 7.10 Evaluation of uncertainty affecting the measurement of IT errors
7.10.1 General
7.10.2 Preparation of the equations for the measurement model
32 7.10.3 Definition of the measurement model
34 7.10.4 Contributions from calibration or conformity certificates
7.10.4.1 Contributions from calibration certificates
7.10.4.2 Contributions from conformity certificates
35 7.10.5 Preparation of the tables for calculating the uncertainty budget
7.11 Procedures in special applications
36 Annex A (informative) Calculation of the expanded uncertainty in accuracy tests of ITs
A.1 Example of calculation of an uncertainty budget
A.1.1 Contributions from calibration certificates
A.1.2 Setup- and DUT-specific contributions
37 A.1.3 Fluctuations of the comparator readings
39 A.1.4 Calculation of the expanded uncertainty
40 Bibliography

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BSI 23/30479106 DC
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