Question { Bharat Bijlee, 37007 }

What is the make of breakers, transformers, generators?
What are their capacities and ratings?

Answer

BREAKERS. (M.V,H.T) RATINGS

GENERAL ELECTRICAL(GE) 125A.250A,400A,1000A,1250A

Cromption Greavies. 125A.250A,400A,1000A,1250A
Siemens. 125A.250A,400A,1000A,1250A
L&T. 125A.250A,400A,1000A,1250A
ABB. 125A.250A,400A,1000A,1250A
TRANSFORMERS.
Kirlosker. 750 KVA,1250KVA,2.0 MVA
Indo tech. 750 KVA,1250KVA,2.0MVA
Cromption Greavies 750 KVA,1250KVA,2.0MVA

Question { Apollo, 47863 }

what is difference between AC VVVF drive & Dc VVVF drive
explain their working principle?

Answer

VVVF MEANS VARIBLE VOLTAGE AND VERIBLE FRIQUENCY IT TAKE DC
VOLTAGE TO RUN DAT VOLTAGE IS MAY BE 24V DC CORRENT ONLY
DEPENDING UPON THE APPLICATION IT IS BASED

Question { ABB, 190940 }

What are the difference between C-Curve and D-Curve for
MCB's.

Answer

C CURVE USED IN INDUSTIAL APPLICATION AND D CURVE USED IN
DOUMASTICK APPLICATION

Question { L&T, 57467 }

WHY THE FREQUENCY IS 50 HZ IN INDIA.CAN WE USE SOME OTHER
FREQUENCY.IF SO WHAT IS THE RANGE AND WHAT WILL BE THE
EFFECT IN PRESENT POWER SYSTEM IF WE CHANGE THE FREQUENCY
AS YOU SUGGEST ?

Answer

IN INDIA THERE IS A STANDARD FREQUENCY IT IS 50HZ BUT IN
OUTHER COUNTRYS IT IS 60HZ IT IS STANDARD

Question { Emerson, 99347 }

Difference between ups

Answer

inverter is device which is converting dc to ac
where as a ups is backup support power supply source to the
system

Question { 9132 }

how to connect from a line-to-line connection to a line-to-
neutral connection?

Answer

we have to connect if it is a three phase wires we have to
connect one of the wire is connect to power supply input
wire,and the another wire which is not connected has to
connect neutral