Mindblown: a blog about philosophy.
-
Excitation Protection of Alternator
Loss of field or excitation can be caused in the generator due to excitation failure. In larger sized generator, energy for excitation is often taken from a separate auxiliary source or from a separately driven DC generator. The failure of auxiliary supply or failure of driving motor can also cause the loss of excitation in…
-
Stator Earth Fault Protection of Alternator
This is to be noted that, the star point or neutral point of stator winding of an alternator is grounded through an impedance to limit the ground fault current. Reduced ground fault current causes less damage to the stator core and winding during ground or earth fault. If the ground impedance is made quite high,…
-
Fault of Electric Cable
It can be of three (3) types of electric cable faults found. They are There may be a short circuit between two conductors, There may be earth fault, i.e., fault between conductor and ground, There may be open circuit caused due to disconnection of the conductor. There can be more than one of the faults…
-
Electric Poles
For carrying of overhead line, wooden poles, concrete poles, steel poles and rail poles are used. Which poles are to be used, depending on the importance of load, location, and place, cost effect of such construction, including maintenance cost, and keeping its profit element in mind. In low voltage line for all phases, natural and…
-
Load Factor
What is Load Factor? In electrical engineering, the Load Factor is defined as a ratio of the average load divided by the maximum (or peak) load in a given time of period. In other words, the Load Factor is the ratio of total energy (kWh) used over a specific period of time to the total…
-
Impedance Matching
What is Impedance Matching? Impedance matching is defined as the process of designing the input impedance and output impedance of an electrical load to minimize the signal reflection or maximize the power transfer of the load. An electrical circuit consists of power sources like amplifier or generator and electrical load like a light bulb or…
-
Performance of Transmission Line
There are three main types of Overhead Transmission Lines: Short transmission line – The line length is up to 60 km and the line voltage is comparatively low less than 20KV. Medium transmission line – The line length is between 60 km to 160 km and the line voltage is between 20kV to 100kV. Long transmission line –…
-
Mobile Substation
What is Mobile Substation? Sometimes it is required to supply power to a particular place in fully temporary basis. Such as at civil contraction or other construction places where huge consumption of electricity is required but after completion of the construction work the necessity of power will not be as high as during construction.In these…
-
Electrical Power Substation
Electrical Substation Now days the electrical power demand is increasing very rapidly. For fulfilling these huge power demands the modern time requires creation of bigger and bigger power generating stations. These power generating stations may be hydro-electric, thermal or atomic. Depending upon the availability of resources these stations are constructed different places. These places may…
-
Why Supply Frequency is 50 Hz or 60 Hz?
In olden days people do not have integrated power system as we have now. They had their own standard and load items which are suitable for their power system. That time they had operating frequency range between 16.75 Hz to 133.33 Hz. When people think about large power generation system, they puzzled with the standard that to…
Got any book recommendations?