Tricky but Easy Electrical Engineering!
Faraday’s Law: Faraday’s Law states that, whenever the flux of magnetic field through the area bounded by a closed conducting loop changes, an emf is produced in the loop. The produced emf is given by ξ = -dØ/dt where Ø = ∫B.ds is the flux of the magnetic field through the area. Ø is called the … Read more
Definition: Lenz’s Law states that the direction of the induced current is such that it opposes the change that has induced it. In other words, it is defined as “Effect Opposes the Cause”. Lenz’s Law is used to find the direction of induced current in a conducting loop. As per Faraday’s Law of electromagnetic induction, a current … Read more
What is Current? Electric Current is defined as the rate of flow of net charge through the conductor with respect to time. The direction of current is conventionally is in the direction of flow of positive charge. It is the flow of charge per unit time. If Q current is flowing through any cross sectional … Read more
Permanent Magnet Moving Coil or PMMC Instruments are the best for the measurement of DC quantities like voltage and current from accuracy point of view. But there are various factors due to which error in PMMC Instrument reading may develop. To investigate the main sources of errors, let us have a look at the deflection … Read more
Permanent Magnet Moving Coil or PMMC Instruments are the most accurate type for the measurement of DC current or voltage. The working principle of PMMC instruments are same as that of d’Arsonaval type of Galvanometer, difference being that a direct reading instrument is provided with pointer and scale. Construction of PMMC Instruments Permanent Magnet Moving … Read more
Trip Circuit Supervision Circuit senses any fault either in the trip coil of breaker or trip circuit. On sensing a fault, Trip Circuit Supervision Relay changes its contact status to window annunciation on the panel. Here fault in the circuit means any break or open circuit. In this post we will be discussing the working … Read more
OPGW stands for Optical Ground Wire. Earlier we used shield wire / sky wire / Ground Wire for protecting the high voltage phase wires form lightening strikes on the Transmission Tower. But today, we use OPGW as shield wire /sky wire / ground wire. It is designed to replace traditional static / shield / earth … Read more
What is Eddy Current? The literal meaning of Eddy is a circular current. Thus the word itself means current having no definite circular loop. Eddy current is defined as the induced current on the surface of conductor in little loops or eddies due to changing magnetic flux. To better understand the concept of eddy current, … Read more
We are well aware of the fact that electrical machine core is made up of laminated sheets. This is done to reduce the eddy current loss. But how laminated core reduces the eddy current loss and what is the relation between the Eddy Current Loss and thickness of lamination? Let us consider an electrical machine … Read more
Power Line Carrier Communication (PLCC) is used for the purpose of protection of line and communication between the two stations. Two different PLCC channels are used for the protection of a single line. This is the reason, you will notice that wave traps are normally installed in R and B phase of transmission line. The … Read more