Energization of a no-load transformer for power restoration purposes: modeling and validation by on site tests

Author

Rioual, Michel ; Sicre, Christophe

Author_Institution

R&D Div., Electr. de France, Clamart, France

Volume

3

fYear

2000

fDate

23-27 Jan 2000

Firstpage

2239

Abstract

The energization of power transformers following a complete or partial collapse of the system is an important issue. This paper describes a method for the modeling of the electric network between the source and a target transformer, taking into account the data accuracy which has a strong impact on the resonance frequency of the network and consequently on the temporary harmonic overvoltages involved. This methodology has been validated by on site tests, the resonance frequency and the initial conditions being derived from the measurements. Finally a comparison between measurements and EMTP (EPRI/DCG version 3.0) simulations has been performed, showing a good agreement on currents, the average discrepancy being equal to 5%, the value of the subtransient reactance of the generator and the capacitance of the line having a value within the accuracy initially stated

Keywords

capacitance; electric reactance; ferroresonance; overvoltage; power system harmonics; power system restoration; power transformers; EMTP simulations; average discrepancy; capacitance; data accuracy; electric network modeling; ferroresonance; no-load transformer energisation; on site tests; power restoration; power system collapse; power transformer energisation; resonance frequency; subtransient reactance; temporary harmonic overvoltages; Capacitance measurement; Current measurement; Frequency measurement; Power system modeling; Power system restoration; Power transformers; Resonance; Resonant frequency; Surges; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering Society Winter Meeting, 2000. IEEE

Print_ISBN

0-7803-5935-6

Type

conf

DOI

10.1109/PESW.2000.847704

Filename

847704