IEC IEEE 61869-21-2025 测量互感器 - 第21部分：测量互感器准确度测试中的不确定度评估

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IEC/IEEE 61869-21

Edition 1.0 2025-12

INTERNATIONAL

STANDARD

Instrument transformers -

Part 21: Uncertainty evaluation in the accuracy test of instrument transformers

IEC/IEEE 61869-21:2025-12(en)

ICS 17.220.20

ISBN 978-2-8327-0784-5

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IEC/IEEE 61869-21:2025 © IEC/IEEE 2025

CONTENTS

FOREWORD .......................................................................................................................... 3

INTRODUCTION .................................................................................................................... 5

1 Scope ............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions, abbreviated terms and symbols ......................................................... 6

3.1 General definitions ................................................................................................. 7

3.2 Definitions related to measuring devices .............................................................. 11

3.3 Abbreviated terms ................................................................................................ 12

3.4 Symbols ............................................................................................................... 12

4 Sources of uncertainty in a system for accuracy test ..................................................... 12

4.1 General ................................................................................................................ 12

4.2 Uncertainty contribution from the reference IT ...................................................... 13

4.3 Uncertainty contribution from the comparator ....................................................... 13

4.4 Uncertainty contribution from the burden .............................................................. 13

4.5 Uncertainty contribution from the voltage or current source .................................. 13

4.6 General considerations on other sources of uncertainties arising in accuracy

test setups............................................................................................................ 14

4.7 Sources of uncertainty in special applications ....................................................... 14

5 Requirements ................................................................................................................ 15

5.1 Requirements concerning the reference IT ........................................................... 15

5.2 Requirements concerning the comparator ............................................................. 15

5.3 Requirements concerning the burden ................................................................... 16

5.4 Requirements concerning the voltage or current source ....................................... 16

5.5 Special applications .............................................................................................. 17

6 On-site accuracy test or verification of ITs..................................................................... 17

6.1 Purpose of on-site accuracy test or verification ..................................................... 17

6.2 Interval of on-site accuracy test or verification ...................................................... 17

6.3 Requirements and sources of uncertainty ............................................................. 18

7 Procedures for accuracy test of ITs ............................................................................... 18

7.1 Overview .............................................................................................................. 18

7.2 Methods to evaluate errors of ITs with digital comparators ................................... 19

7.3 Connections in the accuracy test setup................................................................. 22

7.4 Burden connection................................................................................................ 23

7.5 Demagnetization of inductive CTs ........................................................................ 23

7.6 Selection of the time acquisition interval ............................................................... 23

7.7 Selection of the sampling frequency ..................................................................... 23

7.8 Procedure for applying the Type A method in uncertainty evaluation .................... 24

7.9 Procedures for on-site accuracy test of ITs ........................................................... 24

7.10 Evaluation of uncertainty affecting the measurement of IT errors .......................... 26

7.10.1 General ......................................................................................................... 26

7.10.2 Preparation of the equations for the measurement model .............................. 26

7.10.3 Definition of the measurement model ............................................................ 29

7.10.4 Contributions from calibration or conformity certificates................................. 31

7.10.5 Preparation of the tables for calculating the uncertainty budget ..................... 32

7.11 Procedures in special applications ........................................................................ 33

Annex A (informative) Calculation of the expanded uncertainty in accuracy test of ITs ........ 34

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标签： #测量 #评估 #不确定度

摘要：

本文档介绍IEC IEEE 61869-21-2025《测量互感器 - 第21部分：测量互感器准确度测试中的不确定度评估》标准。该标准为测量互感器准确度测试提供了系统的不确定度评估方法，涵盖误差来源分析、测试条件影响、统计处理及报告要求，帮助测试人员与实验室统一评定流程，确保校准与测试结果的可信度和可比性。通过遵循该标准，设备制造商、电力系统运维方及第三方检测机构能够更准确地判断互感器是否满足准确度等级，优化测试方案并降低误判风险，同时为国际间技术互认奠定基础。本页面围绕标准适用范围、关键术语、

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IEC IEEE 61869-21-2025 测量互感器 - 第21部分：测量互感器准确度测试中的不确定度评估

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