Abstract
Shunt reactors are important components for high-voltage and extra high voltage transmission systems with large line lengths. They are used to absorb excess reactive power generated by capacitive power on the lines when no-load or under-load occurs. In addition, they play an important role in balancing the reactive power on the system, avoiding overvoltage at the end of the lines, and maintaining voltage stability at the specified level. In this paper, an analytical method based on the theory of magnetic circuit model is used to compute the electromagnetic fields of shunt reactors and then a finite element method is applied to simulate magnetic field distributions, joule power losses, and copper losses in the magnetic circuit. In order to reduce magnetic flux and avoid magnetic circuit saturation, it is necessary to increase the reluctance of the magnetic circuit by adding air gaps in the iron core. The air gaps are arranged along the iron core to decrease the influence of flux fringing around the air gap on shunt reactors' total loss. Non-magnetic materials are often used at the air gaps to separate the iron cores. The ANSYS Electronics Desktop V19.R1 is used as a computation and simulation tool in this paper.
Highlights
The shunt reactor is a widely used component that improves the stability and efficiency in power transmission systems
The gaps are reasons to flux fringing along the gaps [6,7,8] which increases the power losses in the shunt reactor
It should be noted that the volume of the air gaps depends on the main parameters of the shunt reactor, i.e. reactive power, magnetic flux density, winding inductance, frequency, and energy storage in the winding space air gaps
Summary
The shunt reactor is a widely used component that improves the stability and efficiency in power transmission systems. Under no or small load, parasitic capacitance will appear in the line, its value is quite large especially in long lines, which will increase the voltage along the line, causing overvoltage at the end of the line. This phenomenon is known as the Ferranti effect [1,2,3]. In order to reduce the magnetic flux and avoid the saturation of the magnetic circuit, the reluctance is increased by creating horizontal gaps. The gaps are reasons to flux fringing along the gaps [6,7,8] which increases the power losses in the shunt reactor. An analytical method based on the theory of magnetic circuit model and finite element method (FEM) were used to compute and simulate the electromagnetic parameters of shunt reactors
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