Articles | Volume 7, issue 1
https://doi.org/10.5194/jsss-7-339-2018
https://doi.org/10.5194/jsss-7-339-2018
Regular research article
 | 
07 May 2018
Regular research article |  | 07 May 2018

Test equipment and its effect on the calibration of instrument transformers

Enrico Mohns and Peter Räther

Abstract. State-approved test centres in Germany supplying accuracy tests for instrument transformers must, in the future, provide measurement uncertainty budgets for their quality management systems. In this work, the cause of ratio error and phase displacement of instrument transformers are therefore discussed. The traceability to the national standards of PTB, the attainable uncertainty, and the permitted error limits of test equipment for testing instrument transformers are presented. Finally, an example of an uncertainty budget for a current transformer of the class 0,2 S is given.

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Short summary
Test centres supplying accuracy tests for instrument transformers must provide measurement uncertainties for their quality management. In this work, ratio error and phase displacement of instrument transformers are discussed. The traceability to the national standards of PTB, the attainable uncertainty and the permitted error limits of test equipment for testing instrument transformers are presented. An example of an uncertainty budget for a current transformer of the class 0,2 S is given.