Deepakkumar Yadav
Testing of Isolator Introduction to Isolators : When carrying out inspection or repairs in a sub – station or charged line repairs it is essential to disconnect the section of line on which the work is to be carried out. This disconnecting device is a isolator. As the name suggests it solates the of the … Read more
Other Tests of Bushing Temperature Rise and Thermal Stability Test Temperature rise test is carried out for bushings having rating below 132 kV. It is carried outdoor at normal power frequency voltage. The voltage is applied till temperature of bushing reaches steady state value. The temperature rise should be less than 40° C.Temperature rise is … Read more
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