The growing capabilities of power electronic components have developed the use of FACTS devices. The higher power levels have been made available in converters for highest voltages. The overall starting points are network elements influencing the impedance or the reactive power of a part of the power system. For FACTS devices, it has two terms to be explained. One of the terms is dynamic, which is used to express the fast controllability of FACTS devices which is provided by the power electronics. This is one of the main differentiating factors from the conventional devices. Another one is static, which is used to perform the dynamic controllability because it has no moving parts like mechanical switches. This article discusses about compensators used in power electronics, that includes Static Synchronous Series compensator (SSSC), TSSC, TSSR, TCSC and TCSR.
In general, electrical signals are transmitted from one circuit to another circuit using various components or mediums. If we consider the television system operated using IR, then the infrared remote which consists of IR emitter is used to transmit electrical signal from remote circuit to the TV internal circuit. Similarly, every remote operated system uses either RF or IR or laser or etc., for transmitting electrical signals from one circuit to another circuit. In this article, let us discuss about Opto isolator circuit working and applications. [Read more…]
NPN and PNP transistors are bipolar junction transistors, and it is a basic electrical and electronic component which is used to build many electrical and electronic projects. The operation of these transistors involves both electrons and holes. The PNP and NPN transistors allow current amplification. These transistors are used as switches, amplifiers or oscillators. Bipolar junction transistors can be found either as large numbers as parts of integrated circuits or in discrete components. In PNP transistors, majority charge carriers are holes, whereas in NPN transistors, electrons are the majority charge carriers. But, field effect transistors have only one type of charge carrier. [Read more…]