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IEC/IEEE 61869-21-ed.1.0
Instrument transformers - Part 21: Uncertainty evaluation in the accuracy test of instrument transformers
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STANDARD published on 15.12.2025
The information about the standard:
Designation standards: IEC/IEEE 61869-21-ed.1.0
Publication date standards: 15.12.2025
SKU: NS-1253465
The number of pages: 40
Approximate weight : 120 g (0.26 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC/IEEE 61869-21-ed.1.0 :
IEC/IEEE 61869-21:2025 provides the requirements, the methods and the guidelines to be applied on the evaluation of uncertainty in testing the accuracy of instrument transformers (IT) with an analogue or a digital secondary signal for measuring, protection and control purposes, with rated frequencies from 15 Hz to 400 Hz. This document covers the uncertainty evaluation in testing the accuracy of IT (including on-site testing of accuracy) independently of the technology used (either inductive or non-inductive). This document reports on how to take into account the sources of uncertainty in the setups for accuracy and how to combine their effects in order to evaluate the uncertainty in the test results.
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