IEEE
IEEE C57.13.1-2017 is a guide published by the IEEE on field testing of current transformers that feed protective relays. It gathers accepted practice for checking these devices once they are installed, so that protection engineers and test crews have a common reference for what to verify and how.
Editions cited: IEEE C57.13.1-2017
The guide addresses current transformers used for relaying, where the concern is that the device reproduces fault current faithfully enough for protection to operate correctly. It deals with the kinds of checks made in the field, such as confirming polarity and ratio, measuring winding resistance, examining the excitation behavior that reveals saturation, assessing connected burden, and verifying insulation condition, along with the conditions that influence the readings. It is a guide and not a requirements document, so it offers recommended practice more than pass or fail rules. Protection engineers, commissioning technicians and maintenance crews use it as a companion to the manufacturer data and to the product requirements published separately for instrument transformers. This page describes the document in original words and does not reproduce it. For the recommendations and any figures, obtain a licensed copy of IEEE C57.13.1-2017 from the publisher.