Capacitor banks

Transitional processes at switching-off high-voltage capacitor banks by circuit-breakers with pre-insertion resistors are considered in the paper. Capacitor banks switching-off process by circuit-breakers with PIR was studied from the point of view improving electromagnetic environment via reducing switching currents by pre-insertion resistors. It is shown in the paper that appropriate resistances and pre-insertion times provides both reducing switching currents and stable operation of resistor.

Transformers are important elements in the process of transmission and distribution of electricity. Transformer is one of the vital and costliest components of electrical industry. As large number of distribution transformers are installed over a wide area, monitoring and maintenance of these transformers is an important issue. Therefore this paper presents the system which monitor different parameters of distribution transformer and these data are continuously updated on to a webpage using IOT. If any abnormality occurs, the system sends alert messages to the concerned person and an electronic relay operates. As the inductive load increases there will be a decrease in power factor, therefore this system incorporates a power factor improvement mechanism by switching capacitor banks. The main objective of this project is to develop a system which will help the utilities in the protection of transformer and identify problems before any catastrophic failure.

Multi-break vacuum technology has a high dielectric strength restoration during switching-off processes. Based on this technology, vacuum circuit breakers have more efficient breaking capability than single break during current interruption processes. In this paper, numerous simulations of transitional processes conditioned by high voltage capacitor banks switching-off were performed using multi breaks of 110kV vacuum circuit breaker. In the present work the vacuum circuit breaker is modelled by the use of PSCAD/EMTDC program. Dielectric strength of the circuit breaker based on real intercontact distance of the multi-break vacuum has taken into account in this research. The results obtained demonstrate that, use of triple-break vacuum leads to notable decreasing of switching overvoltages and allows in the same time to meet the dielectric requirements for vacuum circuit breakers in high voltage applications more than 110kV.

DG sources have been introduced as one of the most widely used and effective methods among various methods providing losses reduction in power systems. In this paper, the artificial bee colony algorithm has been employed with the aim of determining location and capacity of distributed generations (DGs) and capacitor banks (CBs) in distribution systems. The proposed objective function includes power losses and ENS reliability index, which is used by deploying weight coefficients as objective function in the algorithms. Accordingly, the standard 37-bus networks have been used for studies. The simulation results demonstrate that the artificial bee colony algorithm is more effective in all sections and has higher capability in reducing losses and improving reliability as well.

Vacuum circuit breaker technology based on double-break vacuum interrupters has become the most requirements of high voltage circuit breakers that not environmentally harmful. The vacuum interrupter has an excellent ability to deal with the steep rising part of the transient recovery voltage, which makes it faster in the current interruption process. This paper presents results of computer simulations conditioned by capacitive currents switching-offs by using single and double interrupters of vacuum circuit breakers. These results demonstrate that use of double-break circuit breakers leads to notable decreasing of switching overvoltages and allows in the same time to meet the dielectric requirements for high voltage vacuum circuit breakers

Transitional processes at switching-off high-voltage capacitor banks by circuit-breakers with pre-insertion resistors are considered in the paper. Capacitor banks switching-off process by circuit-breakers with PIR was studied from the point of view improving electromagnetic environment via reducing switching currents by pre-insertion resistors. It is shown in the paper that appropriate resistances and pre-insertion times provides both reducing switching currents and stable operation of resistor.

Vacuum circuit breaker technology based on double-break vacuum interrupters has become the most requirements of high voltage circuit breakers that not environmentally harmful. The vacuum interrupter has an excellent ability to deal with the steep rising part of the transient recovery voltage, which makes it faster in the current interruption process. This paper presents results of computer simulations conditioned by capacitive currents switching-offs by using single and double interrupters of vacuum circuit breakers. These results demonstrate that use of double-break circuit breakers leads to notable decreasing of switching overvoltages and allows in the same time to meet the dielectric requirements for high voltage vacuum circuit breakers.