what is the thumb rule to know current carrying capacity of copper conductors of different size.1 1795
What is the difference between single phase, 2phase, and 3 phase motors?2 5470
what is single phase motor?5 2693
what is 2 phase motor?4 3421
what is the difference between single phase, 2 phase, and 3 phase in electric meter?1 4323
Please help me.What are the difference between two wire, 3wire, and 4 wire in electric meter?3 2263
keeping in view of parallel operation which of the 3 phase transformer connection are possible? a)delta-delta to delta-star b) delta-delta to star-delta c) star-star to delta-delta d) delta-star to star-delta4 12329
How does a television work?789
In my 3 phase 4 wire electrical system N to earth voltage is 0.08 is it ok What is standard for it ?
what is a power factor?
HI SIR, AM PREPARING FOR RRB FOR SECTION ENGINEER POST. PLZ SEND ME THE PREVIOUS QUESTION PAPERS AND HELP ME. I HAVE NO ENOUGH TIME MY EXAM DATE IS 22ND JUNE.... MY EMAIL ID IS firstname.lastname@example.org
When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?
what is proper capacitor placement? How to evaluate capacitor size?
IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
what is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.
in india per day how much power is generated including all power station
WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.
how to select fuse rating for a 3-phase motor ???
how calculate the electrical load for industry and office
How to calculate the copper in HT motors if KW, RPM & Voltage is given
What is the types of HT motor testing
what are inductive and capacitive voltage transformers.what are their applications