Differential protection is used to protect the transformer and generator against internal fault but for larger generators, additional protection is provided called Restricted earth fault protection. also known as REF protection. When the neutral of the transformer or generator is…
A three-phase AC induction motor is a constant-speed motor as a DC shunt motor. But the speed of the DC shunt motor can be changed smoothly simply using rheostats. This maintains the speed regulation and efficiency of the DC shunt…
Types of insulators are used in an overhead transmission and distribution line to provide insulation to power conductors from the ground and tower or supporting structure. like Pin type of insulators, Suspension, and Strain type insulators. There are 5 types of insulators…
Due to the desirable Torque-speed characteristics, the series motor is exclusively used in traction applications. Dc series motor satisfy all requirements for this kind of work and services but the transmission of ac power is more economical than DC. This…
The type of motor that operates on both DC and single phase AC supply is called Universal Motor. The universal motor is also called an ac series motor. The universal motor works at approximately the same speed and output on…
In this article, we will explore the basics difference between AA and AAA battery, including their size, capacity,common uses and voltage. AA and AAA batteries are two common types of household batteries. The main differences between them are their size…
Magnetic Oil Gauge is also referred to as MOG. it is a device that is fitted on the conservator tank to monitor the transformer oil level. The MOG is a small circular dial shape window placed on the side of…
Master Trip Relay is an important auxiliary relay in power system protection. In this article we will discuss, the working, function, and significance of the Master Trip Relay, also known as the 86 relay. We will explore the different types…
In power system protection, circuit breaker tripping is crucial if any fault occurs in the system. If the trip circuit is unhealthy and the fault occurs, the circuit breaker will not trip, the fault will pass through the circuit breaker…
Double Revolving Field Theory The double field revolving theory of single phase induction motor is proposed to explain this problem of no torque developed at starting and yet torque once rotated. Double revolving field theory is based on the fact…