star delta motors start as a Y for 3 phase so the windings that normally see 480 volts see 277V a relay switches to delta then it runs as a normal delta motor
the reduces the starting current by about 60% for 3 phase
What is the continuous current of 10HP star delta motor
A forward reverse star delta is a two in one motor starter where a motor first runs on star connection and then changed to delta connection after a time which has been set. The motor direction can be changed, whether forward or reverse
If a motor is connected in a star configuration it will operate at a slower speed. This is the working process that a star delta starter operates on. At first through the starter the motor starts in the star connection. When the motor gets up to its highest speed in that connection it times a timer out , the star starter drops out and the delta starter pulls in and then connects the motor in the delta connection. This allows more voltage to be applied to the motor and it then speeds up to its nameplate rated RPM.
If the motor terminal has six terminals in the terminal box, then it can be connected either in delta or star. If there are only 3 terminal wires then the motor can not be connected in star.(it means that the motor is designed to be connected in delta only)
This depends on the motor rating.
What is the continuous current of 10HP star delta motor
A star-delta motor should be supplied star-delta.Wye is simply another name for star. Star-delta motors use a star or wye configuration to start, and a delta configuration to run. This reduces the voltage on the windings during the high current starting time.
A forward reverse star delta is a two in one motor starter where a motor first runs on star connection and then changed to delta connection after a time which has been set. The motor direction can be changed, whether forward or reverse
If a motor is connected in a star configuration it will operate at a slower speed. This is the working process that a star delta starter operates on. At first through the starter the motor starts in the star connection. When the motor gets up to its highest speed in that connection it times a timer out , the star starter drops out and the delta starter pulls in and then connects the motor in the delta connection. This allows more voltage to be applied to the motor and it then speeds up to its nameplate rated RPM.
On a star delta starter a motor overload or a motor going to ground and cause a short circuit will cause the overload protection to trip. These overloads have to be reset before the motor can be restarted.
That is the star point contactor that opens when it goes into the delta configuration.
If the motor terminal has six terminals in the terminal box, then it can be connected either in delta or star. If there are only 3 terminal wires then the motor can not be connected in star.(it means that the motor is designed to be connected in delta only)
YES!!!
how will you start 3phase inuction motor using star delta stater
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.
If the motor is designed to operate on star (wye) then it is fine. If it is designed to operate on delta, then you need to consider that star will present lower operating voltage than delta, and that might damage the motor.Some motors are designed to start on star and run on delta. Usually, this applies to larger motors, and cannot be overlooked. If there are only three wires (ignoring chassis ground), then the motor is intended for delta. If there are only four wires, the the motor is intended for star. If there are six wires, then the motor is intended for star-delta. Of course, the starter controls could be integrated with the motor, so it is best to consult the name plate and operate the motor exactly as it was designed.
starter is used to limit the starting current to save the motor. for star-delta first star mode is enabled so the applied voltage is reduced to safe value after the motor catches the rated speed the mode is changed to the delta mode. hence the full supply voltage is applied to the motor.