Test Methods for Validating Inductive Transformer Performance during Cable Discharge: Main Principles, Parameters and Testing Procedures

Andrea Grđan (), Igor Žiger, Zlatko Hanić, Imre Tannemaat, Ralf Huth and Ivan Novko
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Andrea Grđan: Končar—Instrument Transformers Inc., J. Mokrovića 10, 10090 Zagreb, Croatia
Igor Žiger: Končar—Instrument Transformers Inc., J. Mokrovića 10, 10090 Zagreb, Croatia
Zlatko Hanić: Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia
Imre Tannemaat: TenneT TSO B.V., Utrechtsweg 310, 6800 AS Arnhem, The Netherlands
Ralf Huth: TenneT TSO GmbH, Bernecker Straße 70, 95448 Bayreuth, Germany
Ivan Novko: Končar—Electrical Engineering Institute Ltd., Fallerovo Šetalište 22, 10000 Zagreb, Croatia

Energies, 2024, vol. 17, issue 4, 1-14

Abstract: High voltage connections will discharge through inductive voltage and combined transformers when they are switched off. In the past, there was a wide margin between the required capabilities and the actual capabilities of these components. Nowadays, however, this aspect is becoming more prominent due to a higher penetration by cable systems into the grid. Currently, none of the relevant international standards contain any definitions or requirements for line discharge, nor test methods which would validate the ability of the transformer to discharge a line of certain capacitance at a certain voltage. This is why the aim of this paper is to provide a foundation for how to specify, assess and verify the capacitive discharge performance of instrument transformers. This paper will present the basic theory, influencing parameters, multiple test sequences and acceptance criteria for cable discharge. It is clear that capacitive discharges present both thermal and mechanical stress to the unit, which is why this paper will detail how to guarantee both aspects. The idea is that this paper serves as a literal blueprint which can then be transferred to the relevant clauses in upcoming international standards. All conclusions within this paper are achieved through calculations and testing on actual 123 kV inductive voltage transformers and combined units.

Keywords: inductive voltage transformers; combined transformers; line discharge; test methods (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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