Mitigation of Capacitor Bank Energization Harmonic Transients
In the present study, an overview of the capacitor bank energizing transients is presented and the means of harmonic mitigation technique are investigated. Capacitor bank connection is essential due to reactive compensation reasons. Transients produced upon of capacitor bank energizing, reach in harmonics, may be harmful for the capacitor and become an increasing concern for both electric utilities and customers since its switching usually occurs quite frequently. We know that power factor correction capacitors are sensitive to harmonics and one factor of the failures of power capacitors indicates the prime odd harmonics like 5th, 7th, 11th, 13th harmonics. A time domain simulation using PSCAD/EMTDC was performed to predict the harmonic spectrum of the distorted voltage waveform in a real 11 kV Romanian distribution subsystem
A Review on Protection of Capacitor in Power Quality Industry
In large industry, power factor has become a majorissue in power system. Many industries have been using a capacitor bank for power factor improvement and reactive power compensation. With the use of capacitor bank, disturbance such as inrush current is increased in the system and can cause damage to the capacitor banks and other nearby equipment. This paper aims to study issues in terms of inrush current in the industry and its effect after switching the capacitor bank. The capacitor bank is used in industry for system stability, power factor improvement, and reactive power compensation. To reduce the switching transients of the capacitor bank, pre-insertion resistor technique is used. Most of the industrial loads are nonlinear in nature which aims at lagging power factor. To avoid this problem, capacitor banks are installed in the system. After switching to a capacitor bank, disturbances are increased, thus, the protection scheme is fulfilled for the reliability of the system.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).