Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy. In addition to running the commonplace appliances that we use every day, electric motors are …
Capacitor Banks In Power System (part one)
Capacitance When a charge is delivered to a conductor its potential is raised in proportion to the quantity of charge given to it. At a particular potential a conductor can hold a given amount of charge. Capacitance is the term to indicate the limited ability to hold charge by a conductor. Let charge given to …
How to explain your kids, what is the electricity?
It’s really not an easy task to explain kids what is the electricity and what is really happening in the wires while lamp is powered, or what are the magnets, magnetism and how all this stuff works. Most important of all is to explain your kids about danger that electric current can cause, and how …
Light Detector – Under The Hood
Detectors of electromagnetic radiation in the spectral range from ultraviolet to far infrared are called light detectors. From the standpoint of a sensor designer, absorption of photons by a sensing material may result either in a quantum or thermal response. Therefore, all light detectors are divided into two major groups that are called quantum and …
Zero Emission Power Plant, Without Carbon Dioxide
Abstract India is the world’s fourth largest economy and has a fast growing energy market. India’s current power capacity is 30% short of demand. Coal and petroleum are the primary sources of energy. High ash content in Indian coal and inefficient combustion technologies contribute to India’s emission of air particulate matter and other trace gases, …
Voltage Instrument Transformer (VT) – Introduction
Instrument transformers are primarily used to provide isolation between the main primary circuit and the secondary control and measuring devices. This isolation is achieved by magnetically coupling the two circuits. In addition to isolation, levels in magnitude are reduced to safer levels. Instrument transformers are divided in to two categories: voltage transformers (VT) and current …
Fossil fuels are almost gone… Solar Energy? Hell Yes!!
Infinite energy resource Solar energy is not a finite resource as fossil fuels are. While the sun is up there it constantly produces all the energy we can use. Reduced maintenance costs While not maintenance free, what technology really is? Once solar panels, wind or water power facilities are in place, no fuel or lubricants …
Protection and Relays Used In Main Circuit Board at a Power Grid Substation
1. High speed biased differential relay The DMH type relay provides high speed biased differential protection for two or three winding transformers. The relay is immune to high inrush current and has a high degree of stability against through faults. It requires a max of two cycles operating time for current above twice relay rated …
220V DC System at Thermal Power Station
The 220V DC system supplies direct current as source of operating power for control, signaling, relays, tripping and closing of switchgears, emergency motors of most important auxiliary systems. Under normal conditions of station generation, the storage battery units are kept floating in DC bus bars by means of the trickle chargers (also known as float …
Solar energy is free, but what does it really cost?
“Solar energy is free, but it’s not cheap” best sums up the major hurdle for the solar industry. There are no technical obstacles per se to developing solar energy systems, even at the utility megaWatt level (e.g., 14 MW utility scale PV system at Nellis AFB or a 64-MW CSP system in Nevada); however, at …
