Electrical4U 
When a short circuit fault happens, a large current flows through the system, including the circuit breaker (CB). This flow, unless stopped by the CB tripping, subjects the CB parts to significant mechanical and thermal stresses. If the CB’s conducting parts lack sufficient cross-sectional area, they can overheat, which may damage the insulation. CB contacts … Read more
Now days, vacuum switchgear is getting popularity very rapidly. In medium voltage switchgear application, medium voltage vacuum switchgear ranges from 3 to 36 KV. Now days, vacuum interruption technology, in medium voltage application, dominates, air, SF6 and oil technologies. Since, vacuum circuit breaker is more safely and reliably operated where number of faulty and normal … Read more
From 3 KV to 36 KV switchgear system is categorized as medium voltage switchgear or MV switchgear. These switchgears are of many types. They may metal enclosed indoor type switchgear, metal enclosed outdoor type switchgear, outdoor type switchgear without metal enclosure, etc. The interruption medium of this switchgear may be insulating oil, SF6 gas or … Read more
In a DC machine, carbon brushes are placed at the magnetic neutral axis, which matches the geometrical neutral axis when there’s no load. When the machine is loaded, the armature flux moves along the inter-polar axis, forming a triangular wave shape. This flux, directed along the brush axis, causes cross magnetization of the main field, … Read more
High voltage switchgear is defined as equipment managing voltage above 36KV, producing high arcs during switching operations. Therefore, it requires careful design. The main component is the high voltage circuit breaker (CB), which must be reliable for safe operation, even after long periods of inactivity. High voltage circuit breaker technology has improved significantly in the … Read more
The insulating material (may be fluid or air) used in circuit breaker should serve two important functions. They are written as follows: The second point needs more explanation. To understand this point let us consider a situation if there is some fault or short circuit in the system, the relay provides desired signals to the … Read more
A magnetic circuit is defined as the path in space through which magnetic flux passes. An iron-cored solenoid produces magnetic flux when DC current flows through it. The flux lines start at the N pole, pass through the air to the S pole, and return through the iron core. When flux lines pass through both … Read more
Armature windings can be classified into two types – lap windings and wave windings. Here we are going to discuss lap windings and the two main types of lap windings in DC machines. These are known as Simplex Lap Windings and Duplex Lap Windings. What is a Lap Winding? A lap winding is a winding … Read more
The feed water and steam circuit of a boiler includes key components like the economizer, boiler drums, water tubes, and super heater. Economizer Another essential component of Feed Water and Steam Circuit is Boiler Drum. Boiler Drums Boilers use two types of drums: the steam drum and the mud drum. Each has specific functions within … Read more
Laplace transformation is a technique for solving differential equations. Here differential equation of time domain form is first transformed to algebraic equation of frequency domain form. After solving the algebraic equation in frequency domain, the result then is finally transformed to time domain form to achieve the ultimate solution of the differential equation. In other … Read more