Tricky but Easy Electrical Engineering!
What is Relay? “Relay is a device that detects the fault and initiates the operation of the circuit breaker to isolate the faulty element from rest of the healthy power system.” Protection of electrical equipment plays a vital role in Power System not only from the point of view of economy behind costly equipment but … Read more
Corona has many advantages and disadvantages. Therefore for designing a transmission line, care must be taken to have a balance between the advantage and disadvantage of Corona. Advantage of Corona Following are some of the advantage of corona: The effective diameter of power conductor increases due to Corona. How? Actually, due to corona, the air … Read more
Ferroresonance is a resonance phenomenon caused by the nonlinear inductance and system capacitance. For better understanding of ferroresonance, it is worth to remind the linear resonance in LRC circuit. Linear Resonance Let us consider a linear LRC circuit as shown in figure below. Total Impedance of Network Z = (jωL – j/ωC) where w … Read more
Self Inductance or Inductance is defined as the property of a material due to which it opposes the flow of current through it. It is usually denoted by ‘L’ and its SI unit is Henry. How a material possess such property? To understand, let us consider a coil having N number of turns and connect … Read more
Electrodynamometer Wattmeter are often used for the measurement of power consumption. The construction of such instrument similar to the construction of electrodynamometer type ammeter and voltmeter. An electrodynamometer wattmeter have two types of coils. One coil is fixed and another coil is moving. The fixed coil is connected in series to the circuit whose power … Read more
When the potential difference between the terminals of two or more inductors are same, it is said that they are connected in parallel. As potential difference or voltage across the terminals are same therefore current flowing through the inductors may or may not be same. If the parallel connected inductors have the same value of … Read more
Electrodynamometer Wattmeter consists of two coils, pressure coil (PC) and current coil (CC). Pressure coil is connected across the circuit whose power is to be measured and current coil is connected in series. Thus circuit voltage is impressed across the PC and CC carries the circuit current. For constructional detail please read Electrodynamometer Wattmeter – Construction … Read more
Mutual Inductance Mutual inductance is defined as inductance of a circuit caused by mutual coupling with other circuit. Mutual coupling of two coils means that magnetic field produced by one coil is linking / crossing the other coil and vice versa. Mutual Inductance is generally denoted by letter M and its SI unit is Henry. … Read more
As we know, in any kind of electrical machine there are two types of winding. One is Armature Winding which carries the load current and other is field winding which carries the DC current to create required magnetic flux. This magnetic flux serves the purpose of coupling between mechanical power and electrical power. In DC … Read more
Creeping in energy meters is phenomena due to which the disc of energy meter rotates even in absence of any load current in the current coil (CC) and only pressure coil (PC) is energized. The necessary condition for creeping is that PC must be energized. This is required as the friction compensating device is voltage … Read more