Deepakkumar Yadav
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
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
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
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
Testing of Insulators Q. Describe in brief various tests carried out on overhead line insulators. Insulators are used on transmission line towers for providing support to conductors and to provide insulation between line conductor and transmission line tower. The commonly used insulators are pin type, suspension type, string type. The entire HV tests on insulators … Read more
Power Frequency Tests of Insulators Dry Flashover Test Wet Flashover Test Wet and Dry Withstand Test 1. Dry Flashover Test The insulator is in completely dry and clean state. It is connected to the metallic structure or tower as shown in Figure A. Figure A The power frequency source is connected across the insulator string … Read more