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Star (Y) and Delta (Δ) connections are two configurations used in three-phase electrical systems. In a Star connection, one end of each of the three windings is connected to a common point (the neutral), while the other ends are connected to the phase lines, providing a higher voltage across the load. In contrast, the Delta connection links the windings in a closed loop, allowing for a higher current capacity and providing more power to the load. Star connections are typically used for lighter loads and in starting motors, while Delta connections are preferred for running motors and heavy loads due to their efficiency in power delivery.
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What is acceptable value of tan delta in oil filled and dry type 33 KV transformers?
Tan Delta is a condition monitoring test. Value of Tan Delta very much depends upon the temperature and recommended values at 20Deg.C is 1. Values at other temperatures can be determined by using correction factor given in IEC76
How much KW range can be use star-delta starter?
The use of a star delta starter is for motor control only and not resistive heating loads. This type of starter is used to dampen the inrush current by using a lower voltage to start the motor.
At how many amps should a 30kw motor run at with no load in delta?
First, the amps drawn will be different depending on the supply voltage. You do not say which yours is - 208? 460? 4,160? Second, manufacturers normally give two different current figures, one for the motor running with full load, and one for 'locked rotor'. Locked rotor current is the very high current drawn when power has been applied, but the motor has not had time to start spinning. No one that I know of publishes 'current at no load' for their motors. Since a motor with no load is not doing anything useful, no one really cares how much current is being drawn. It's kind of like putting your car up on a jack so the wheels are off the ground and asking how much fuel will the car burn sitting still with the wheels turning at 50 miles an hour! Also, since a three phase motor does not have a neutral connection, it is, in effect, always delta connected. Delta and wye connections have the same voltage and phase characteristics IF you do not have a neutral. The motor cannot tell the difference.
Why do we use star to star connection in motor?
In a high voltage installation, with the same power, current drawn is small compared to those in low voltage. However it requires a thicker insulation, thus cost of insulation is significant compared to the conductor cost. By using a star connected winding, the insulation voltage required is equal to line to neutral connection, otherwise if it is connected in delta the insulation rating has to be provided for a line to line connection. Despite having a higher current, the total cost is still lower compared to using a higher insulation rating.
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IWant to see the connection of the daigram Star and Delta connections?
Google star delta motor connections. If a motor is wired in star-delta (Yd), it starts up with lots of torque and then switches over to delta for normal "running". This is because the start-up current per phase when delta connected is much larger than star.
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