why generally transformer are in star to delta or delta to
star used?
Answers were Sorted based on User's Feedback
Answer / hareesh k soman
There r two reasons for the star and delta connection.. one
is load requirement i.e if load is un balanced we will go
for star.. i.e neutral will ground the fault current where
the delta will use for balanced load.
other reason is insulation requirement .. i.e in Power
transformer HV side will be star connected and LV side will
be delta connected. for example in 220kV/132kV power
transformer, in star connected HV line to line voltage is
220kV and phase voltage is 127kV i.e its required lesser
insulation. but in delta connected system V line= V phase
i.e 220kV insulation is required. but star only 127kV is
required...
Is This Answer Correct ? | 41 Yes | 6 No |
Answer / tiang cs
HV system is mainly in connected in star connection because
of high insulation cost is needed for the HV system. If HV
connected in delta connection, and 1 phase shorted to
ground, then the phase voltage will become line voltage
which threathen the isulation in HV system.
Medium voltage usually connected in Delta connection
because no neutral is needed and if 1 phase shorted to
ground, the medium voltage system is unaffected and remain
operational.
For low voltage side, the connection is usually star
connection cause the neutral is needed for single phase
power supply. Besides that, LV system is most commonly
access by human and for safety reason, star connection is
prefered.
Is This Answer Correct ? | 9 Yes | 4 No |
Answer / kidus mizan@yahoo.com
if the amount of power to be transformed is greater than that w/c can be handled by one transformer, it become necessary to employ two or more unit in parallel.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / shahbaz shaikh
as we use the transformers for the step up or step down the
electrical quantity and when we use star/delta there is some
relation between line and phase quantity which help in the
connections
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / pavan kumar
the reason behind is to eliminate the triplen harmonics
Is This Answer Correct ? | 6 Yes | 15 No |
Answer / rashid
As per question, we use delta /star or star /delta as per
our system requirment bcoz we need star connection to get a
nuetral and phase for our protections in case of delta we
are not able to do this, and otherwise the delta connection
is better for system stability also we also need star at
end users where we need single phase supply,
Is This Answer Correct ? | 6 Yes | 20 No |
Answer / s p
Transformers are in such a way bcos they are either step up or step down. In case of Step down the configuration is Star to delta & the other way if it is Step up. It is to protect the transformer & the equipments safety.
Is This Answer Correct ? | 5 Yes | 29 No |
Main purpose of using transformer is to convert the power,
Either from high to low or vice versa....i e step up or
Step down....for more deatils go through Power plant or
power system books.. Why transformer is neccessary in
transmission net work..n How the power will converted from
high voltage to low voltage..etc
Is This Answer Correct ? | 5 Yes | 35 No |
1. which type of transformer connection is preferred in case of power supply transformers? (A) Star/Star (B) Delta/Delta (C) Star/Delta (D) Zig Zag/Star 2. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding 3. The power factor of a purely inductive load is (A) Zero (B) Lagging (C) Leading (D) Unity.
9 Answers CECRI_Central_Electrical_Research_Institute,
How to calculate the electrical load for a standard telecom BTS shelter and choose the DG set capacity for the same load?
Why capacitor is blow when I am starting motor ?
What are the causes of electrical faults?
how earth resistance can be improved in dry soil
how to measure the voltage drop in cables also give formulas to calculate.
which type of stability limit is higher,steady state or transient? why?
What size cable (based on voltage drop) is required to supply a 40 A three phase boiler if the wiring system is 75V single insulated cables installed in non-metallic rigid conduit 56m from the main switchboard? Voltage drop in the consumer's mains is 8V.
Why NGR is required for 11Kv geneartor in power plant
why full load voltage is less than no load voltage?
Suppose an electric motor with a controller is not working. What is the sequence of testing you will do in your troubleshooting?
what is suroounding current of dg set?