Electrical and Electronic Engineering 2014, 4(1): 10-19 DOI: 10.5923/j.eee.20140401.02 High Voltage Instrument Transformers Ferroresonance Events Occurring in the Investigation of the Circuit Breaker Switch Positions Hilmi Zenk 1,* , A. Sefa Akpinar 2 1 Vocational School of Technical Sciences, Giresun University, Gazipasa Campus, Giresun, 28200, Turkey 2 Department of Electrical and Electronics Eng., Eng. Faculty, Karadeniz Technical University, Kanuni Campus, Trabzon, 61000, Turkey Abstract The Transformers in the power system is one of the most widely used elements. Transformers working in the linear region with a yield of electromagnetic energy provides a high rate conversion. However, with the onset of saturation of the transformer ferromagnetic core begins to fall due to the efficiency of energy conversion losses start to increase. Any power system elements constituting a sudden ferrorezonans are enough potential for the realization of the event. These elements of the transformer inductance and non-linear loads can be summarized in the resistance and capacitance. In this study, high-voltage transmitter to the controlled switched my order to make semiconductor power electronic switching elements connected with the resistance and capacitance cargoes including ferroresonance instantly switches opening and closing built resonance will occur in the electrical events, actual circuit conditions were investigated. Keywords Ferroresonance, Overvoltage, Switch angle position (SAP), FFT Analysis 1. Introduction In recent years, the rapidly growing energy needs and, in parallel, rising energy prices and environmental factors such as pollution, renewable energy sources and in particular to people in proportion more efficient use of the energy produced is headed. Renewable resources is continuous and does not cause environmental pollution in this area has attracted the attention of many researchers. However, if the energy produced in whatever way you produced, reducing losses and improving the quality of power is an area that is always worth working on. Determines of the power quality their basic components, electrical energy supply continuity, frequency, voltage effective value of the voltage transient period occurs because the pits and hills, sudden voltage changes between phases unbalance, voltage and current waveforms that occur in harmonics and flicker as listed[1]. Electric power generation, transmission and distribution is a very complicated process. Transmission line; generators, transformers, capacitors, there are loads of protection elements. In such a transmission system, the presence of such elements or some malfunction of the circuit in the event * Corresponding author: hzenk@msn.com (Hilmi Zenk) Published online at http://journal.sapub.org/eee Copyright © 2014 Scientific & Academic Publishing. All Rights Reserved of different work situation can cause various physical events[2]. One of these events, many researchers focus on is the Ferrorezonans event. Transformer in a power system where you will also remain disabled even with some of the load groups or ferroresonance can occur with very little loading[3]. Ferroresonance having a wide variety of events, generally iron-core coil with saturable occurring between capacitors known as nonlinear resonance condition[4]. In the case of ferroresonance, overvoltage and very irregular wave patterns revealing these cases, one or more may be saturated inductance in series are often stimulated by the co-located with capacitive circuit occurs[5]. Power transformers, reactors, transformers and electromagnetic voltage measurement will be effective until the system is inherently included in the system which is in close proximity capacitive elements occurs between[6]. Ferroresonance in electric power systems are known for many years that the event has occurred. Ferroresonance to understand and analyze a variety of models are used[7]. Hayashi almost periodic solutions of nonlinear differential equations to do is use the harmonic balance method[8]. Depending on the frequency content of the fluctuations normally harmonic ferroresonance basic, sub-harmonic, quasi-periodic and can be classified as irregular ferroresonance[9]. In this study, a single-phase system on the high-voltage instrument transformers with a real ferroresonance event which is formed, the system's electrical parameters were analyzed and the results interpreted and ferroresonance effect consisting of the various current and