Tricky but Easy Electrical Engineering!
Ungrounded System is one where the neutral is not connected to earth. Thus, neutral of ungrounded system is isolated. Arcing Ground is an electrical phenomenon in which the voltage of faulty phase fluctuates due to capacitive charging current. This arcing ground phenomenon is prevalent in three phase ungrounded neutral system. Don’t worry I will explain … Read more
To better understand the working principle and need of Petersen Coil, let us have a look at the arcing ground phenomenon. We know that arcing ground phenomenon is observed in ungrounded 3 phase system. During arcing ground the voltage of healthy phase rises from phase voltage to line voltage i.e. it becomes √3Vph. Also, arcing … Read more
We know that, Electric Power is transmitted using three phase transmission system due to its own advantages. But for any system it is very important to define some parameters to evaluate the performance. Therefore, there must be some parameters which define the performance of transmission line. Yes, there are two parameters namely, Voltage Regulation and … Read more
Transmission Line Performance is determined by two parameters. Those parameters are Voltage Regulation and Transmission Efficiency. In this post we will be discuss and evaluate the performance of short transmission line. As we know that the effect shunt capacitance of line is neglected for short transmission line. Therefore, for the sake of study and analysis … Read more
In short transmission line, the effect of shunt capacitance is ignored for the sake of calculation and performance analysis. This is because, the length of short line is less and the voltage at which power is transmitted is also less. As the power is transmitted at relatively higher voltage and the length of line is … Read more
The Dry Cell was discovered by French Scientist G. Leclanche in 1868. It is the most common cell which is the improved version of Leclanche Cell. It is a portable cell and free from liquid. This is why, it is called dry cell as it do not contain any liquid. Dry Cell is widely used … Read more
Nominal T Method In Nominal T model of Transmission line, the whole shunt capacitance of line is assumed to be lumped at the middle of the line. The half of the line resistance and reactance is assumed at either side of the shunt capacitance as shown in figure below. Due to such modeling of line, … Read more
ABCD parameters are generalized parameters of transmission line. These parameters are quite helpful for calculation and analysis of transmission line. In any four terminal network, the input voltage and current can be expressed in terms of output voltage and current provided the network should be passive, linear and bilateral. Fortunately, a transmission line is a … Read more
The current sensitivity of voltmeter of moving coil type like PMMC voltmeter is defined as the deflection per unit current in the coil. If Ɵ be the angular deflecting of needle of voltmeter for current I through the moving coil, then sensitivity of voltmeter is given as S = Ɵ / I You might think … Read more
An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by some protective layer. Normally, electric power can either be transmitted using over head lines or underground cables. But the use underground cable offers a variety of advantages. Some of the advantages are listed below. It is less liable … Read more