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
Method of Neutral Grounding Q. State the method of neutral grounding. Explain the solid grounding and state advantages of grounding. Objectives (Advantages) of Grounding : Persistent arcing is eliminated. Faulty part can be disconnected by protective relaying. Over voltage due to arcing can be eliminated. Magnitude of transient voltage is reduced. System provides greater safety … Read more
Energy Conservation Techniques In Transformer Q. State energy conservation techniques in transformer. (A) Load Sharing : The problems like overloading, variation in voltage and heating are very common in transformers. . It takes a lot of time for its repairing and maintenance and also involves high cost Load sharing protects the transformer under overload condition. … Read more
Need of Energy Conservation in Transformer Q. State the need of energy conservation in transformer. Explain the use of Epoxy Resin Cast/ Encapsulated dry type transformer from energy conservation point of view. Constructional/ Salient Features : CRGO M – 4 or M – 3 grade toroidal cores are wound with secondary enameled copper wire, which … Read more
Energy Efficiency Transformers Q. State and explain the features of amorphous core transformers which result into energy conservation. Amorphous Core Transformer Amorphous core transformers or amorphous metal transformer is a type of energy efficient transformer. Amorphous transformer is an equipment to reduce transmission and distribution losses greatly. With improvement of electric steel (silicon steel), loss … Read more
Electrical Tests are Carried Out Before Commissioning of Transformer Q. Which electrical tests are carried out before commissioning of transformer. Electrical test carried on transformer : Electrical tests : Check winding resistance as per given values. Check insulation resistance between windings, between windings and core. With external body. Take reduced voltage run test. Check cooling … Read more
Open Delta Method of Testing of Transformer Q. Explain open delta method of testing of transformer. The method of transforming 3-phase power by 3 windings i.e. 3 transformers is a regular ordinary method in which 3 units of 10 KVA will supply a power of 3 x 10=30 kVA. But it is possible to transforms … Read more