The assembly of the apparatus used to change some characteristic (e.g. voltage, a.c. to d.c., frequency, p.f etc.) of electric supply is called a sub-station. The four major types of substations are explained in this article. Sub-stations are an important part of the power system. The continuity of supply depends to a considerable extent upon the successful operation of … [Read more...] about 4 Major Types of Electrical Substations
The IEEE defines protective relays as: “relays whose function is to detect defective lines or apparatus or other power system conditions of an abnormal or dangerous nature and to initiate appropriate control circuit action ”. Relays detect and locate faults by measuring electrical quantities in the power system which are different during normal and … [Read more...] about Classification or Types of Protective Relays
What is Voltage Surge or Transient Voltage? The sudden rise in voltage for a very short duration on power system is known as voltage surge or transient voltage. Surges or transients can damage, degrade, or destroy electronic equipment within any home, commercial building, industrial, or manufacturing facility. Transients can reach amplitudes of tens of thousands of volts. … [Read more...] about Voltage Surge 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 voltage may cause erratic operation or even … [Read more...] about Why Voltage Control is Important?
Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer. So it is very important that the secondary of Current Transformer should not be kept open. The reason is quite interesting. Either it should be shorted or must be connected in series with a low resistance coil such as current coils of watt meter, coil of … [Read more...] about Why Current Transformer (CT) Seconday Should not be Open ?