why do we use star-delta starter. what is its need?
Answer Posted / d.ramesh classes
Technical explanation
When the windings of a 3-phase motor are connected in STAR:
the voltage applied to each winding is reduced to only (1 /.'/'3) [1 divided by root three] of the voltage applied to the winding when it is connected directly across two incoming power service lines in DELTA.
the current per winding is reduced to only (1 /.'/'3) [1 divided by root three] of the normal running current taken when it is connected in DELTA.
so, because of the Power Law V [in volts] x I [in amps] = P [in watts],
the total output power when the motor is connected in STAR is:
PS = [VL x (1/.'/'3)] x [ID x (1/.'/'3)] = PD x (1/3) [one third of the power in DELTA]
where:
VL is the line-to-line voltage of the incoming 3-phase power service
ID is the line current drawn in DELTA
PS is the total power the motor can produce when running in STAR
PD is the total power it can produce when running in DELTA.
by D.RAMESH CLASSES
Is This Answer Correct ? | 19 Yes | 8 No |
Post New Answer View All Answers
how technical is calculated in 11kv line and lt line
number of I/O devices in siemense plc
being an electrical engineer why you wanna come into software i have an very good academics what answer i have to give
WHAT R THE SAFETIES IN A HIGH TENSION PANEL N LOW TENSION PANEL. ALSO WAT SAFETIES R THERE IN A 200 KVA TRANSFORMER?
xfhnchncv?
Is it possible to download the Siemens Selection Chart(TYPE 2 coordination) for 1) fuseless selection 2)Fuse selection
what is the minimum pay scale for electrical engineer (building construction)in kuwait? plz revert back with yrs of experience & pay scale respectively.
What OPGW is better than Microwave or PLCC???
What are the basic elements used for modeling mechanical translational system?
What is the name of the winding to which supply is given?
why the making current is more than then the breaking current and if its true then its about a controling circuit or breaker power contact points
Hello sir, pls send me hpcl technical test papers .i am. Appearing for the exam.
why effective resistance should be more than static resistance in transmission line?
how much value of resistance should connect to 15 kw, 6 pole 3 phase slip ring induction motor having RV-240, RA-42.
Explain the laying procedure and laying depth of submarine/subsea power cable for 220/400KV system? Also available cable diameter?