when meggering a 3ph,480v oil reservoir heater on a regen
gas compressor, why do I get a reading to ground when
meggering phase to ground? shouldn't it read opened or is
there something that makes it read closed? on the same
heater, when ohming, it reads open. thanx
Answer / k.prakashchandra
The resistance between phase to ground is in mega ohms if
star point is not earthed.
Is This Answer Correct ? | 3 Yes | 1 No |
21. What is the purpose of taking Capacitance and Tan Delta Test in Transformer bushing? 22. What are the protections to be used for Generator? 23. Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0 24. What happens when the polarity changes in CT? Explain briefly? 25. Explain the Term in CT Name Plate – Class: 5P10
how a.c. genarator control power factor when its conected to grid supply by incrising or decresing excitation voltage.
How to improve the power factor from 0.8 to 0.98? Also tell me cost vs benefit analysis.
What is Dry type transformer.How it works
why semicondoctor use in HT cable?
mostly the questions were from machines... d.c. machines, transformer, synchronous and induction all theory paper........ few from power system... but the level of paper was easy.....
In DC motor,the field MMF is given by NI.N-no.of field winding turns,I-excitation and both are constant.Then how could the main flux decreases due to armature reaction.
We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).
what is the differebt between ac and dc fuse?
What is the difference between AC and DC injection methods for rotor earth fault protection
0 Answers Asian Alliance Insurance, NBVL,
What is the function of Buchholz relay in transformer ?
what is mean by NPS (Negative phase sequence)fault? what is the difference between EFR & OCR faults?
0 Answers TNEB Tamil Nadu Electricity Board, Vestas,