Why Delta Star Transformers are used for Lighting Loads.
Answers were Sorted based on User's Feedback
Answer / t eswara rao
For lighting loads, neutral conductor is must and hence the
secondary must be star winding. and this lighting load is
always unbalanced in all three phases. To minimize the
current unbalance in the primary we use delta winding in the
primary. So delta / star transformer is used for lighting loads.
Is This Answer Correct ? | 81 Yes | 5 No |
i think there are mainly two resone
1. in a big sub station or in company power supply is used
for plant load (which is generally use only 3 phase neutral
is not used)this supply also used for plant lighting which
is require neutral to obtain this neutral we use Delta Star
transformer which is also called isolation transformer
2. Delta star transformer is used to isolated secondary
side earth fault (which is common in lighting circuit) from
primary side.
Is This Answer Correct ? | 7 Yes | 0 No |
Answer / guest
delta-star transformers are used for lighting loads
because in delta side primary side the voltages fed are in
phase (R-Y-B) and thus on the secondary side the star
connection aims at equal currents in all the phases in case
of 3 phase thus equal current flows and thus the lighting
intensity is not disturbed for the lighting loads.
Is This Answer Correct ? | 23 Yes | 20 No |
Answer / p krishna teja
in delta connection there is no common point ( i:e no
netural) for lighting we need netural line for
maintaining voltage difference. so star connection is need
for lighting .
on delta connection 3 phase we can only get 415 volts as
there is no netural line we cant use individual phase .
But in stare connection 3 phase ther is flexibility of
using individual phases with common netural 230 volts.
Is This Answer Correct ? | 7 Yes | 5 No |
Answer / b.b.barah nalco
I agree with Mr. P Krishna Teja but one thing is there, to minimize the fault current secondary winding should be star connection and minimize the watt loss.
Is This Answer Correct ? | 1 Yes | 2 No |
In Power cable specification what is U0/U and Um.
hello friends..... any one have papers or any study materials?sail ,hpcl...?
What type interview questions ask in Electrical technicians
how to calculate lighting for a room
can we run a motor rated 50Hz,415vac,1440RPM At higher speed then rated on name plate with the help of VFD /drive on long term basis.wheater it will effect the motor life
how to calculate no load losses units comsumed by transformer
CONSIDER A 415V/200V STEP DOWN TRANSFORMER.CAN WE USE USE IT AS STEP UP TRANSFORMER BY GIVING 200V IN SECONDARY AND TAKING OUTPUT FROM PRIMARY?
full form of flry b
On what factors the generating voltage depends ? Generating voltage are (3.3kV, 6.6KV , 11KV, 13.8kV) Why so ?
does the Trivector Meter of three phase automatically takes care of the low power factor and gives the reading accordigly or it does not take care of the Power factor while giving the readings please explain
What is RCBO? hw it works
I am getting diesel genset 62 kv for my house In addition there are 6 meters of 11kv for the house Lift also being installed for house plot sise 200sq yds total 4 + 2 foloors I want to know how much earthing required how deep it should be