Types of Functional Relays Most of the relays in service on power system today operate on the principle of electromagnetic attraction or electromagnetic induction. Regardless of the principle involved, relays are generally classified according to the function they are called upon to perform in the protection of electric power circuits. For example, a relay which […]
Types of Protective Relays In a power system consisting of generators, transformers, transmission and distribution circuits, it is inevitable that sooner or later some failure will occur somewhere in the system. When a failure occurs on any part of the system, it must be quickly detected and disconnected from the system. There are two principal
Gas Turbine Power Plant A generating station which employs gas turbine as the prime mover for the generation of electrical energy is known as a gas turbine power plant. In a gas turbine power plant, air is used as the working fluid. The air is compressed by the compressor and is led to the combustion
Generation of Electricity in Thermal Power Plant A generating station which converts heat energy of coal combustion into electrical energy is known as a steam power station. A steam power station basically works on the Rankine cycle. Steam is produced in the boiler by utilising the heat of coal combustion. The steam is then expanded
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Methods of Voltage Control in Power System In a modern power system, electrical energy from the generating station is delivered to the ultimate consumers through a network of transmission and distribution. For satisfactory operation of motors, lamps and other loads, it is desirable that consumers are supplied with substantially constant voltage. Too wide variations of
Power Factor Correction Equipment The electrical energy is almost exclusively generated, transmitted and distributed in the form of alternating current. Therefore, the question of power factor immediately comes into picture. Most of the loads (e.g. induction motors, arc lamps) are inductive in nature and hence have low lagging power factor. The low power factor is
Bus Bar Arrangement in Substation When a number of generators or feeders operating at the same voltage have to be directly connected electrically, bus-bars are used as the common electrical component. Bus-bars are copper rods or thin walled tubes and operate at constant voltage. In this article, we shall discuss some important bus-bars arrangements used
How do solar pv panels generate electricity ? Photovoltaic (PV) conversion is the direct conversion of sunlight into electricity with no intervening heat engine. PV devices are solid state; therefore, they are rugged and simple in design and require very little maintenance. Perhaps the biggest advantage of solar PV devices is that they can
Electrical Insulation Resistance Test This test can be carried out on a complete installation, a group of circuits or on a single circuit, whichever is most suitable for the installation being tested. This test is carried out to find out if there is likely to be any leakage of current through insulated parts of the
Memory is an electronic component with the function of “memory”, which uses physical devices with two stable states to store information. The main function of the memory is to store the program and various data, and can be in the process of computer operation at high speed, automatically complete the program or data access. In
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