EMF Equation of AC Winding: The B-wave of a EMF Equation of AC Winding synchronous machine (in general multi-polar) assumed sinusoidal is drawn in Fig. 5.15 and a single full-pitched coil (coil-side space separation Ï€…
Current Graded Overcurrent Protection: An alternative to time grading or in addition to time grading, current graded overcurrent protection can be applied when the impedance between two substations is sufficient. It is based on the…
Types of Feeder Protection Relay: A composite transmission system may use one or more of the following types of Feeder Protection Relay. Overcurrent Protection: This is of two types: (i) nondirectional time and current graded…
Power Swings in Power System Protection: The impedance measured or seen by a distance relay during normal load is shown in Fig. (5.29). Normally this would be outside the tripping zone of the distance relay,…
Types of Surge Absorber: The travelling waves set up on the transmission lines by the surges may reach the terminals apparatus and cause damage to it. The amount of damage caused not only depends upon…
What is Flash Memory in Digital Electronics? Flash Memory in Digital Electronics (sometimes called "flash RAM") is a type of constantly-powered nonvolatile memory that can be erased and reprogrammed in units of memory called Blocks.…
80287 Numeric Data Processor: The 80287 Numeric Data Processor is an advanced version of its predecessor, the 8087, and it is specially designed to operate with the processor 80286. The 80287 provides about 70 additional…
Sinusoidal PMAC Motor: Since the voltages induced in the stator phases of a sinusoidal PMAC motor are sinusoidal, ideally, the three stator phases must be supplied with variable frequency sinusoidal voltages or currents with a…
Magnetic Flow Meters: Magnetic Flow Meters are the first type of flowmeters to be considered for high corrosive applications and for applications involving measurement of erosive slurries. These meters work on the principle of Faraday's…
Various Factors of Frequency Effect on Calibration: The Various Factors of Frequency Effect on Calibration such as: Skin effect Non uniform distribution of current along the heater wires Spurious capacitive currents 1. Skin Effect: The…