Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer. So it is very important that the secondary of Current Transformer should not be kept open. The reason is quite interesting. Either it should be shorted or must be connected in series with a low resistance coil such as current coils of watt meter, coil of … [Read more...] about Why Current Transformer (CT) Seconday Should not be Open ?
Electrical Machines
Ideal Transformer and Practical Transformer
Ideal Transformer An ideal transformer is one that has no winding resistance no leakage flux i.e., the same flux links both the windings no iron losses (i.e., eddy current and hysteresis losses) in the core Although an ideal transformer cannot be physically realized, yet its study provides a very powerful tool in the analysis of a practical transformer. In … [Read more...] about Ideal Transformer and Practical Transformer
Properties of Good Transformer Oil
Even though the basic functions of the oil used in transformers are heat conduction and electrical insulation, there are many other properties which make a particular oil eminently suitable. Properties of good transformer oil are explained in this article. Organic oils of vegetative or animal origin are good insulators but tend to decompose giving rise to acidic by-products … [Read more...] about Properties of Good Transformer Oil
Percentage Impedance of Transformer and Its Calculation
What is the Percentage Impedance? The percentage impedance of a transformer is marked on most nameplates - but what is it and what does the Z% figure mean? The impedance of a transformer is the total opposition offered to alternating current. This may be calculated for each winding. However, a rather simple test provides a practical method of measuring the equivalent … [Read more...] about Percentage Impedance of Transformer and Its Calculation
What are Motor Control Centres?
The terms ‘Switchgear’ and ‘Motor Control Centres’ are used in general to describe combinations of enclosures, busbars, circuit breakers, power contactors, power fuses, protective relays, controls and indicating devices.Read more about switchgear here What is Switchgear? | Features, Components and ClassificationThe standards used in Europe often refer to IEC60050 for … [Read more...] about What are Motor Control Centres?