Tricky but Easy Electrical Engineering!
A capacitor is a device for storing charge. It is usually made up of two plates separated by a thin insulating material known as the dielectric. One plate of the capacitor is positively charged, while the other has negative charge. The charge stored in a capacitor is proportional to the potential difference between the two … Read more
A Synchronous Machine is named Synchronous because the speed of Rotor is equal to the speed of rotating field. The speed of rotating field is determined by the supply frequency and the number of poles in the machine and knows as Synchronous speed. Any deviating in the speed of rotor from synchronous speed will lead … Read more
Permanent Magnet Synchronous Machines (PMSM) has permanent magnets in their rotor. They are compact, powerful and offer excellent dynamic response. Permanent magnets are expensive and with overheating or overcurrent can partially demagnetize. Synchronous Reluctance Machines (SynRM) have a rotor made of layers of magnetically soft material. These ferromagnetic layers orient along the stator magnetic field … Read more
First of all we should know why do we need to improve the power factor? Suppose we want to transmit P amount of power to the load center with a power factor of 0.1. Thus, Current flowing through the Transmission Line I1 = P/0.1V = 10P/V Now if we transmit power at a power … Read more
When a three phase motor looses one of the phase supply voltage then it is called Single Phasing. Single Phasing a case when any one phase out of the three phases fails. Since one of the phases is now disconnected, current through other two phases will increase to produce the desired torque. The motor will … Read more
In Synchronous Machine, the armature winding is provided on Stator and field winding on Rotor which is contrary to other Electrical Machines. In fact there are certain issues due to which we provide armature winding on Stator. The benefits of this are as follows: More Economical: It is more economical to provide Armature winding on … Read more
If you get a chance to visit any substation or Switchyard, you will notice that the surface of the Switchyard is fully covered with small size Gravels. The use of gravels on the surface has the following things to do: Although Substation / Switchyard grounding is very low in the range of 0.5 to 5 … Read more
Step potential is the voltage between the feet i.e. one step of a person standing near an energized grounded object. Touch potential is the touch voltage between the energized object and the feet of a person in contact with the object. It is equal to the difference in voltage between the object and a point … Read more
In Electrical Engineering, every time our aim is to get the perfect Sinusoidal voltage or current without having any harmonics. But the question arises why do we select Sinusoidal waveform why not other waveform for voltage and current? The following reasons favor the use of sinusoidal wave: For Sinusoidal wave, hysteresis and eddy current losses … Read more
Advantages of DC Series Motor: The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC … Read more