The investigation of ferro resonance voltage fluctuation considering load types and damping factors

Abstract

Background and Objectives: The occurrence of ferro resonance is a very complex phenomenon in power systems. In circuits including inductors and capacitors, if the value of zc = zl becomes, an intensification or resonance state is created in the circuit. In circuits and networks that have saturated inductors, nonlinear resonance or ferro resonance is created, Ferro resonance is a nonlinear resonance phenomenon that occurs between the network capacitor and the nonlinear inductance of the transformer during saturation. Ferro resonance at the main frequency and higher frequencies cause insulation problems and at low frequencies causes thermal problems. In the event of this phenomenon, the voltage range increases to a considerable extent and may also be distorted, which due to the structure of the winding connections in transformers can cause damage to electrical installations. Methods: In this paper, we study and simulate the phenomenon of ferro resonance and provide solutions such as using high resistance on the primary side of the transformer and the combination of resistors and inductors on the secondary side of the transformer to damp the ferro resonance in MATLAB software. Furthermore, the utilization of surge arresters is discussed in detail. Results: It is illuminated that utilization of suggested approaches has an acceptable reduction rate on the damping of ferro resonance fluctuations. Especially when using resistor and inductor simultaneously the fluctuations reduce and ferro resonance is damped immediately. Conclusion: It is important to pay attention to the transformer and the amount of capacitors in transmission lines, especially cable lines. Furthermore, asymmetric switching is another important factor. High resistance can reduce fluctuations but causes power losses in the circuit but using Resistance and inductor structure are able to create acceptable damping and reduce fluctuations without loss problems. The presence of a surge arrester can also reduce the overvoltage caused by ferro resonance to an appropriate level.

Effect of GIC Neutral Blocking Devices (NBDs) on Power Network Ferroresonance in Malaysia

“…The ferroresonance phenomenon is a non-linear resonance that occurs in electric circuits containing non-linear inductance, capacitance, and a voltage source. Nonlinear inductance and capacitance include power transformers, voltage transformers, long transmission lines and capacitor banks [17][18][19]. Usually, this phenomenon is observed during transient disturbances like high phase to ground faults [20][21][22], lightning strikes [18], switching or the series connections of the capacitors with transformer magnetizing impedance and removing the loads at the end of the transmission line [23,24].…”

“…The ferroresonance can cause overvoltages, overcurrents, and distorted voltage and current waveforms in an electrical power system, posing a risk to transmission and distribution equipment [25,26] like overheating a transformer and possible insulation damage, failures in cables, and arresters [8,19,23]. As a result of these effects, great care must be considered in the design of the GIC mitigation systems.…”