Tricky but Easy Electrical Engineering!
Advantage of Auto Transformer: The weight of conductor for any winding depends upon two parameters: Current carried by the winding Number of turns required in the winding Thus we can say that weight of conductor in a winding is directly proportional to its Ampere Turns i.e. MMF. Now, we will focus our attention on the … Read more
A Transformer, in which a part of the winding is common to both the Primary and Secondary circuit is called an Auto Transformer. It shall be noted that in Two Winding Transformer, Primary and Secondary windings are electrically isolated but in Auto Transformer, the two windings are not electrically isolated.A simplified diagram of a Step-down Auto Transformer is … Read more
Magnetic Circuit is defined as the path followed by a Magnetic Flux. Magnetic Flux always has a tendency to follow low Reluctance path. The laws of Magnetic Circuit are quite similar to the Electric Circuit but the terms used in Magnetic Circuit analysis is different. Let us consider a Toroid having a magnetic path of … Read more
Power from Generating Station to the Load Center is transmitted by 3 phase 3 wire system. The comparison between 3 phase Power Transmission and 1 phase Power Transmission is done assuming the Power to be transmitted, Voltage, Distance and loss to be same. From the economy point of view the weight of conductor required for both the cases … Read more
Motional EMF is the potential difference produced across the length of a conductor moving in a Magnetic Field. Suppose a conductor of length l is moving with a velocity v in a uniform magnetic field B as shown in figure below. As the conductor is having mobile electrons which can move freely, therefore we can … Read more
A tap changer designed to operate while the Transformer is charged is called On Load Tap Changer (OLTC). On Load Tap Changer, OLTC is Make Before Break type which ensures that no sparking will take place while operating OLTC. On Load Tap Changer (OLTC) is used for short period or daily voltage regulation. During the … Read more
Because of flow of electric current through the winding of Transformer and due to core losses, heat is produced in the windings and core. Because of this heat the temperature of Transformer oil increases. Thus cooling of Transformer Oil is must as we know that the rating of any electrical equipment depends upon its allowable … Read more
Anti Pumping Relay is used in a Circuit Breaker to indicate the spring failure of TNC i.e. Trip Neutral and Close (TNC) switch. TNC switch is used to manually Open and Close the Circuit Breaker either from Local or Remote. This is called TNC switch as it has three positions namely TRIP, NEUTRAL and … Read more
Breather, as the name suggest is just an arrangement though which a Transformer breath air. How does a Transformer Breath? As the load on a Transformer increases, the temperature of Transformer oil increases which cause expansion in oil volume and thus the expanding oil volume pushes the air outside from the Conservator of Transformer. On … Read more
Taps are connections to the, usually high-voltage winding of a transformer which enables changes to the turns ratio to be made in order to make changes to the secondary voltage to compensate, where necessary, to a fall in terminal voltage below the regulatory allowance. There are two types of tap-changing mechanism, ‘Off-Load Tap Changer’ and … Read more