MECHANICAL DESIGN OF OVERHEAD TRANSMISSION LINES
Mechanical factors of safety to be used in transmission line design should depend to some extent on the importance of…
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REQUIREMENTS OF SATISFACTORY ELECTRIC SUPPLY
The electric power system in general is 3-phase a.c. operating at a frequency of 50 Hz. The power station delivers…
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TYPES OF LOADS
A device which taps electrical energy from the electric power system is called a load on the system. The load…
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TYPES OF CONNECTION OF WIND TURBINE TO GRID
There are perhaps four distinct categories of wind power which should be discussed. These are 1. small, non-grid connected2. small,…
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DYNAMIC VOLTAGE RESTORER
Dynamic Voltage Restorer is a series connected device that injects voltage into the system in order to regulate the load…
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METHOD OF RESTORING FOR VOLTAGE SAG
1) TAP CHANGING TRANSFORMERS Electronic tap changing is achieved via the use of back to back thyristors (SCR) with a…
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SOURCES AND EFFECT OF UNBALANCE IN THREE PHASE POWER SYSTEM
SOURCES OF UNBALANCE Unbalance may generate due to the unequal drops in individual phase or unbalanced in three phase loading.…
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WHY SHOULD ONLY AN ONLINE UPS BE USED WITH A STANDBY GENERATOR?
An online UPS accepts input power with relatively wide variations in voltage and frequency, a common occurrence in power produced…
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HOW SHOULD SURGE PROTECTIVE DEVICES BE APPLIED?
• SPDs should be installed with the shortest lead length possible and as close as possible to the load it…
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WHERE DO POWER QUALITY ISSUES ORIGINATE?
Poor power quality is characterized by electrical disturbances, such as transients, surges, sags, power interruptions and harmonics. The disturbances can…