Deepakkumar Yadav
Laws of Thermodynamics and Energy Efficiencies Law of conservation of energy states that the energy can neither be created nor destroyed. The total energy of the system is always conserved. However, the energy can change from one form of energy to another form of energy. The extension of law of conservation of energy is the … Read more
Impulse Tests of Bushing Dry Lightning Impulse Voltage Withstand Test Dry or Wet Switching Impulse Voltage Withstand Test Dry Lightning Impulse Voltage Withstand Test This test is applicable to all types of bushings. It is conducted as per I.S. 2071 (Part 2)-1976. The bushing is subjected to fifteen full wave impulse of positive polarity followed … Read more
Power Frequency Tests of Bushing Power Factor Test Partial Discharge Test Wet Power Frequency Voltage withstand Test Momentary Power Frequency Voltage Withstand Test Visible Discharge Test Power Factor Test High voltage Schering bridge is used for this test. The test setup is shown in Figure A. The conductor coming from bushing is connected to HV … Read more
Testing of Bushings Q. Describe in brief various tests carried out on ‘Bushings’. Bushings are insulators that are generally used on high voltage side of transformer. H.V. side connection The bushing is hollow and half of its portion enters transformer tank as shown. The HV winding connections are carried through bushings and brought out from … Read more
Other Tests of Insulators Temperature Cycle Test Pollution Test 1. Temperature Cycle Test Insulators with their integral parts shall be quickly and completely immersed without being placed in an intermediate container in a water bath. The temperature is maintained at 70°C higher than that of the cold bath (used in the rest of the test). … Read more
Measurement of Partial Discharge Requirements of Partial Discharge Measuring System Most important parameters is apparent charge. The discharge current IC(t) is quantified over small duration of time hence it is called apparent charge. External noise may cause interference with this PD current pulses giving wrong results. So proper filters are necessary. The recorded pulses of PD should … Read more
Global Primary Energy Reserves The most important global energy sources consist of coal, petroleum oil and natural gas. The current availability of these main primary energy reserves are given in the succeeding sections. Coal : The proven global coal reserve has been estimated to be 9,84,453 million tonnes. The USA had the largest share of … Read more
Loss Measurement on Complete Equipment/Schering Bridge with Faraday Cage It is used to measure dielectric loss. It is particularly suitable for the insulation specimen whose one side is permanently earthed. There are two methods subjected for such measurements. (A) Inversion of the ‘Schering bridge using Faraday cage.(B) Use of artificial earth fully screened bridge. (A) … Read more
Indian and Global Energy Sources Energy Sources may be classified into the following types : Commercial energy sources Non commercial energy sources Commercial energy sources : The energy sources that are available in the market and which can be purchased at a definite price from the producing agency are known as commercial energy. By far … Read more
Impulse Tests of Insulators Impulse Voltage Withstand Test Impulse Flashover Test 1. Impulse Voltage Withstand Test The test setup is shown in Figure. The impulse generator is adjusted to produce a standard 1.2/50 impulse wave of peak value equal to the specified value of the impulse withstand voltage corrected for atmosphere conditions in accordance with … Read more