Tricky but Easy Electrical Engineering!
We have already discussed about staring methods of Single Phase Induction Motor. If you miss that please read here, 1) Revolving Field Theory of Single Phase Induction Motors 2) Starting Methods of Single Phase Induction Motors The schematic diagram of Capacitor Split Phase Motor is shown in figure below. Like in resistor split phase motor, … Read more
As discussed in earlier post Revolving Field Theory of Single Phase Induction Motors, a single phase induction motor with main stator winding alone has no inherent starting torque as the main stator winding only produces stationary pulsating air gap flux wave. For the development of starting torque, rotating field at the starting must be produced. There … Read more
Revolving Field Theory is used for the analysis of behavior of Single Phase Induction Motor. Before going into the details of Revolving Field Theory, first we should know why do we need to study this theory? Well, a Single Phase Induction Motor with its main winding alone can be represented as shown in figure below. … Read more
Direct-on-Line or DOL Starting is the simplest mode of starting of Induction Motor where the stator is directly connected to the mains supply as shown in figure below. The motor starts with its own characteristics. When it is switched on, the motor behaves like a transformer with its secondary, formed by the very low … Read more
Magnetic Oil Level gauge or MOG is provided in a Power Transformer to indicate the level of insulating oil in the Conservator. A decrease in level of Transformer Oil in Conservator is an indication of leak and therefore MOG level is an important parameter to be monitored. Normally all Transformers are provided with an expansion … Read more
As we know that Transformer Open Circuit Test is conducted on LV side and that Short Circuit Test on HV side. To understand the reason behind this, we will consider a Single Phase Transformer of rating 3300 / 220 Volt, 33 kVA. Thus the voltage at the LV side of this Transformer is 220 Volt. Therefore, … Read more
Short Circuit Test and Open Circuit Test are two important tests which are carried out on a Transformer to determine its equivalent circuit parameters, Voltage Regulation and Efficiency. Transformer Short Circuit Test Short Circuit Test of Transformer is performed on HV side and the supply voltage is so adjusted that rated current flows … Read more
Open Circuit Test and Short Circuit Tests are two important tests which are carried out on a Transformer to determine its equivalent circuit parameters, Voltage Regulation and Efficiency. Though theses parameters can also be found using the physical dimension of Core and Winding detail but using Open Circuit and Short Circuit Tests are quite easy … Read more
Parallel operation of two or more Transformers means that all the Transformers Primary is connected with the common supply and their Secondary are feeding to a common bus through which load is connected. Parallel operation of Transformers requires that their Primaries as well as Secondaries are connected in parallel. Parallel operation of two or more … Read more
The working principle of Transformer is based on Faraday’s Law of Electromagnetic Induction. In a transformer, an alternating magnetic flux is generated in the core by the primary current. This alternating flux links with the secondary winding. As this flux linkage in secondary is time variant, an emf is induced across the terminals of secondary … Read more