Tricky but Easy Electrical Engineering!
Before going to the mark difference between Dry Type Transformer and Oil Filled Transformer, it is worth to have some discussion on Dry Type Transformer. Dry Type Transformer: Dry Type Transformers find use in locations where the use oil Filled Transformers increases the fire hazard such as shopping malls, Hospitals, residential complexes etc. In dry … Read more
Transformer Oil is basically an Insulating Oil. Insulating Oils or Transformer Oils are mineral electrical insulating oils processed from fractional distillation and treatment of crude petroleum. An Insulating Oil must have the following properties: 1) Excellent dielectric properties resulting in minimum power loss. 2) High resistivity leading to better insulation values between windings. 3) High … Read more
As we know that Demineralized Water (DM Water) is a good insulator so it can strike our mind that why don’t we use DM water for cooling purpose of Transformer in place of Oil? To find the answer, we comare the properties of DM Water and Transformer Oil. Electrical Conductivity: Both Transformer Oil and Demineralized … Read more
A Synchronous Machine is named Synchronous because the speed of Rotor is equal to the speed of rotating field. The speed of rotating field is determined by the supply frequency and the number of poles in the machine and knows as Synchronous speed. Any deviating in the speed of rotor from synchronous speed will lead … Read more
Permanent Magnet Synchronous Machines (PMSM) has permanent magnets in their rotor. They are compact, powerful and offer excellent dynamic response. Permanent magnets are expensive and with overheating or overcurrent can partially demagnetize. Synchronous Reluctance Machines (SynRM) have a rotor made of layers of magnetically soft material. These ferromagnetic layers orient along the stator magnetic field … Read more
When a three phase motor looses one of the phase supply voltage then it is called Single Phasing. Single Phasing a case when any one phase out of the three phases fails. Since one of the phases is now disconnected, current through other two phases will increase to produce the desired torque. The motor will … Read more
In Synchronous Machine, the armature winding is provided on Stator and field winding on Rotor which is contrary to other Electrical Machines. In fact there are certain issues due to which we provide armature winding on Stator. The benefits of this are as follows: More Economical: It is more economical to provide Armature winding on … Read more
Let us consider a 3-phase induction motor first and see how it rotates. A 3- phase supply given to the armature of Induction Motor produces a rotating magnetic field. This rotating magnetic field rotates at synchronous speed Ns = (120xf)/P This rotating magnetic field links to the rotor coils and induces voltage which in turn … Read more
The working principle of Three phase Induction Motor is basically based on the principle of mutual induction as in case of transformer. The major difference between them is that transformer is static in nature i.e. it doesn’t have any moving parts whereas Induction Motor is a dynamic one. Another difference between a Transformer and an … Read more
Insulation Classes based on the temperature it can sustain is classified into the following classes: The following are brief explanations of these insulation classes: Class-Y Insulation: Class-Y insulations can withstands a temperature of up to 90°C and it is typically made of cotton, silk, or paper. Class-A Insulation: Class-A insulations can withstands a temperature of … Read more