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vaccum bottle contact gap,tripping contact,closing and
triping coils,moving lever rods,connector between metering
unit and relay unit
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WHAT IS THE DIFFERENE IN ACTION OF MCB,MCCB,RCCB
why effective resistance should be more than static resistance in transmission line?
Which type of questions well asked. ?
I meggared my 2c*70 sq mm AL AR XLPE cable. its one end show 50 M ohm . is my cable is safe for laying. I have only one phase and neutral.
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
WITCH CARDS IN USE IN FIRE CONTROL PANEL.
How one may guess the direction from which the distribution line is incoming if there is no pole plate on poles?
Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV
If two Transformers are connected in parallel having impedance of 50KA in both transformers will the impedance increase or decrease after connecting transformers in parallel?
i need to give section engineer (electrical engineer) for RRB. Please suggest some book
can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?
BRIEFLY EXPLAIN THE STORAGE CLASSES AND THEIR TYPES IN C
what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?
how to calculate singlephase motor efficiency?
what is the formula of starting current of 3phase and 1 phase motor???
