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Investigation of ferroresonance mitigation techniques in 33 kV /110 V voltage transformer using ATP-EMTP simulation

Abdul Malek, Zulkurnain and Mehranzamir, Kamyar and Salimi, Behnam and Nabipour Afrouzi, Hadi and Mashak, Saeed Vahabi (2012) Investigation of ferroresonance mitigation techniques in 33 kV /110 V voltage transformer using ATP-EMTP simulation. In: 16th Asian Conference on Electrical Discharge (ACED 2012), 10-12 Dec 2012, The ZON Regency Hotel, Johor Bahru.

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Official URL: http://www.jurnalteknologi.utm.my/index.php/jurnal...

Abstract

Ferroresonance is a complex nonlinear electrical phenomenon that can cause dielectric and thermal problems for electrical equipment. Electrical systems with ferroresonant behavior are nonlinear dynamical systems. The ferroresonance phenomenon may take place when the core of an inductive device becomes saturated, and its current flux characteristic becomes nonlinear. While in the case of a linear resonant circuit the resonance frequency is well defined, in the case of a nonlinear circuit, the oscillations may exist at various frequencies, depending on many factors of the particular case. In this paper, ferroresonance phenomenon and its mitigation techniques in 33 kV/110 V voltage transformers (VT) were studied using ATP-EMTP simulation. Initial investigations were carried out for the VT failures occurred at one substation in Malaysia. Physical and burn characteristics of the failed VTs were studied. Simulation results show that ferroresonance cannot be proven to have occurred at the VT due to switching operations since one precondition, namely the critical capacitance, could not have been satisfied. However, in the event of a ferroresonance occurring, several mitigation techniques such as using load resistors, proper grounding sequence, reconfiguration of VT connection, and overcurrent and overvoltage protection can be implemented.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Ferroresonance, ATP/EMTP, voltage transformers
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:34118
Deposited By: Liza Porijo
Deposited On:09 Aug 2017 06:44
Last Modified:29 Aug 2017 01:43

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