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SF6 gas is an inert, nontoxic, colorless, odorless, tasteless, and nonflammable gas. In this gas molecule six tightly bonded fluorine atoms surrounds one sulfur atom. This molecular structure makes SF6 gas five times heavier than air. SF6 in GIS stays at 400 to 600 kPa of absolute pressures. This gas offers three times more dielectric … Read more
Till date in India, coal based power plants contribute maximum power to the power system grid. In coal based thermal power plant, we use coal for heat generation. Coal stores chemical energy. When coal burns, it releases heat. This heat produces steam in the boiler at high pressure and high temperature. This steam then flows … Read more
The basic structure of an electrical power system mainly consists of three parts: generation, transmission, and distribution. It generates electrical power at a certain low voltage level at generating stations. Then, the generated power is stepped up to a higher voltage level and transmitted to the load center. At the load center, the power is … Read more
A Battery Energy Storage System (BESS) is one of the most modern technologies used in power systems to maintain the balance between electricity generation and demand. As renewable energy sources such as solar and wind are increasingly integrated into the power grid. Therefore, energy storage systems are becoming essential for maintaining grid stability and reliability. … Read more
Inrush current in a transformer is caused by the saturation of the core when a high flux is produced at the instant of switching on the transformer. We will explain this phenomenon in the following discussion. Also we shall discuss the necessary theory so that the concept becomes clear. Steady State Flus in a Transformer … Read more
Whenever a dead short-circuit fault occurs in the transformer circuit, the transformer delivers a very large current. Under this condition, the apparent power delivered by the transformer becomes very high. The maximum MVA that the transformer can deliver during this fault condition is the fault MVA of the transformer. Calculation of Fault Current of a … Read more
1. A transformer works on the principle of: A) Self inductionB) Mutual inductionC) Eddy currentD) Hysteresis Answer: BExplanation: A transformer has a core on which the primary and secondary windings are wound. When the primary winding is energized, it draws a magnetizing current and produces magnetic flux in the core. This flux links with both … Read more
A power substation requires the earthing system for three main purposes. The purpose of earthing is to keep any voltage on metal frameworks below dangerous levels during normal or fault conditions. In directly earthed neutral system, it is not always possible to keep metal parts exactly at true earth potential when fault current flows. Therefore, … Read more
A Controlled switching device facilitates the close – open operation of the CB contacts at a pre-determined point of the electrical reference signal waveform to minimize switching surges. Controlled Closing with CSD The controlled closing triggers closing mechanism of a single phase pole contacts of CB at a desired voltage point-on-wave angle of that phase. … Read more
Surge impedance loading, or SIL, is the quantity of power in MVA that a transmission line can carry most efficiently. For understanding the basic concept of surge impedance loading, first, we have to understand the effect of reactive power in a transmission line. How does it reduce the efficiency of the transmission system? The expression … Read more