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In case of a synchronous generator carbon brushes, some brushes expire before the others. Why is so? When all the brushes are installed at the same time, why don't thee expire at the same time?
1 2906Grounding. Dear all at one of my site we checked the amps at the earthing cable to the alternator it was found 125 to 130 A. at the neutal cable in same machine found 146A. in the same plant checked the earthing current on other alternator it was 52A, and neutral 116 A. we are facing problems with our controller and the card was damaged once. can that neutral/GND current be a reason? as there is common grounding for the Alternator,Brkr panel,Transformer?
2 3941Is there any Institution for giving M-tech in Electrical engineering for those who r in service? Give the details please.
2031what is the difference between interconnection and intraconnections in the circuit diagrams
NTPC,
8351how can I calculate charging current of cable/overhead conductor? what is roll of voltage in it ?
3640Post New Electrical Engineering Questions
How can calculate the earthing strip of Copper/GI for rating of 30kV,discharge current 10KA Lightning arrester.
if 6 earth pit value is 1.5 ohm then what should be the number of earth pit to make the value .8 ohm
Do u know any one? how to find out in motor rated amps? formula?
can i use ups power as a raw power for another ups
Motor,transformers,capacitor tubelight etc....
Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?
i have a 4 Mva transformer 34.5 kv / 480-277 v and i used 2 parallel 3200 amp bus duct for the secondary feeder using 3 ply of bus bar ( 3/8" x 5" ) as a common where the flexible link terminated and 6300 amps breaker for the main, the lower bus duct reaches 70 degrees and the upper bus duct reaches 55 degrees when i used thermal scanner. why the temperature is not balance when the load reaches 3600 amps.
when 20hp 3 phase motor start no load condition in star or delta connection.find current and write formula.(tariq)
Whether the vacuum contactor requires Short circuit protection?If No,why?
Usage of flywheel diode in relays
what is the use of Auto re-closer?
I NEED RRB SYLABUS FOR JE ELECTRICAL ,PLEASE SEND TO MY E- MAIL ID joo28_eee@yahoo.co.in
How to see the inductance in a transmission lines
how is calculated the quantity of weight in hot test xlpe?
What is the basis for selecting Vk/2 or Vk/4 for REF and Differential protection of Transformer and What is the significance of magnetising current
