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Why motor is connected in star connection first in star delta starter?
Wiki User
∙ 11y ago
To use a star delta starter, the motor must be a three phase six wire motor. The extra wires out are the wires that are usually terminated in the motor housing as the star point. The starter, when energized, brings the star contactor in and closes the star point coil ends. An external timer times out after the motor gets up to speed in the star connection and drops the star contactor and closes the delta contactor. When in the delta connection the motor coils are then paralleled to allow the motor to run at full voltage.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoStar delta starting is used to reduce the dip in voltage which can feed back to the primary line which makes other customers unhappy when their lights dim each time a high HP motor is started on the same circuit they are connected to. By starting in a wye connection there is less disruption of voltage on the system that the motor is connected to, by starting the motor at a lower voltage and hence lower inrush current. Some utility companies will not allow across the line starting on motors above 30 HP.
Wiki User
∙ 12y agoDue to high starting currents involved,having a star delta starting method is of importance since the machine starts at lower current when in star.As the motor accelerate to almost full load speed, its automatically connected to full load supply current (delta)thus reducing high starting currents that could have been, if started in delta.
Wiki User
∙ 11y agoStar Delta starter is used for those motors where the starting current is likely to be quite high. The motor first connected in star and few seconds later switched over to delta. It means that the motor is designed to run in Delta connection. It is started first in star to limit the high inrush of starting current. Once the motor started, its initial intertia, high troque are overcome then it comes to its normal delta mode.
Wiki User
∙ 11y agoStar Delta starter is used to limit the inrush of high starting current of a motor to a safe value. Normally used with motors starting with high initial torque and/or with a motor beyond a certain KW rating. (generally for 7.5KW or above, but may vary with specific applications)
Wiki User
∙ 9y agoThe purpose of the Star Delta starter is to limit the in rush of high load current due to high initial torque, while starting a relatively higher rated AC Induction motor.
The motor first starts in Star and switches to delta after few seconds.
It is similar to starting a car in first gear and then switching to higher gear. You can not start the car in fourth gear.
Wiki User
∙ 6y agoTo avoid sudden inrush of current in case of high starting torque application
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What will happen if induction motor is in star-star connected?
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.
What is a forward-reverse star delta?
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
Is delta connection also called a star-star connection?
the delta has a higher voltage to ground on the B phase and is identified by the orange color for identification means so its easier to smoke equipment if not careful.hardly see delta connections anymore so old school and outdated. it just makes economic sense to use a star connection.On the above answer there should be no voltage to ground on a delta connection. All three phase coils are connected in series with each other and at no point in the delta are they grounded. Most of the commercial and industrial motor connections are connected delta. In installations where the motor inrush is above utility company specifications the Star- Delta connection is used. This limits the inrush current in the star configuration and then after a time delay connects the motor in a delta configuration. With delta systems the use of grounding lights are mandatory. These are used to detect if a phase grounds out. One phase and the motor can still be in operation, two grounds represent a short circuit and the system will trip.CommentThe second answer is not altogether correct... In the USA and Canada, it is common practise for one phase of the delta-connected secondary windings of a three-phase transformer bank, to have an earthed (grounded) centre tap. With each phase providing 240 V; the centre-tapped phase then provides a combination of 240 V line-to-line together with two 120-V line-to-neutral (earth) voltages which is the standard supply method for residences in North America. The point of common connection between the two remaining phases is termed the 'high leg' of that particular transformer connection, having a potential of 208 V with respect to earth (although this is not used). To summarise, this method provides a 240-V three-phase supply, combined with a single-phase 240/120-V supply, which is useful for small businesses (e.g. garages) which might need to operate three-phase motors.However, the second answer is perfectly true for the UK (and, possibly, elsewhere in Europe) where residences are supplied with just one voltage (230 V) -unlike North America- and delta-connected supplies are relatively unusual.
What configuration was the first successful prototype transistor at Bell Labs connected in?
Common base connection.
What and where is the PNP switch on your 99 Toyota Corolla?
The pnp switch is short for Park/Neutral Switch. Its pretty much the middle man between the ignition switch and the starter. It only allows the current from the ignition switch to reach the starter if the vehicle is in park or neutral. Its usually connected to the shifter. Allow me to correct myself on the first answer. If the shifter is on the column it will be located in the column region. If shifters on the floor its under the vehicle and connected to the shifter.
What will happen if induction motor is in star-star connected?
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.
What is a forward-reverse star delta?
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
Is delta connection also called a star-star connection?
the delta has a higher voltage to ground on the B phase and is identified by the orange color for identification means so its easier to smoke equipment if not careful.hardly see delta connections anymore so old school and outdated. it just makes economic sense to use a star connection.On the above answer there should be no voltage to ground on a delta connection. All three phase coils are connected in series with each other and at no point in the delta are they grounded. Most of the commercial and industrial motor connections are connected delta. In installations where the motor inrush is above utility company specifications the Star- Delta connection is used. This limits the inrush current in the star configuration and then after a time delay connects the motor in a delta configuration. With delta systems the use of grounding lights are mandatory. These are used to detect if a phase grounds out. One phase and the motor can still be in operation, two grounds represent a short circuit and the system will trip.CommentThe second answer is not altogether correct... In the USA and Canada, it is common practise for one phase of the delta-connected secondary windings of a three-phase transformer bank, to have an earthed (grounded) centre tap. With each phase providing 240 V; the centre-tapped phase then provides a combination of 240 V line-to-line together with two 120-V line-to-neutral (earth) voltages which is the standard supply method for residences in North America. The point of common connection between the two remaining phases is termed the 'high leg' of that particular transformer connection, having a potential of 208 V with respect to earth (although this is not used). To summarise, this method provides a 240-V three-phase supply, combined with a single-phase 240/120-V supply, which is useful for small businesses (e.g. garages) which might need to operate three-phase motors.However, the second answer is perfectly true for the UK (and, possibly, elsewhere in Europe) where residences are supplied with just one voltage (230 V) -unlike North America- and delta-connected supplies are relatively unusual.
When you try to start my 89 caprice it just clicks what could be the problem?
Check your battery first, its terminal connection and connection leading to the starter.
What is the star delta working principle?
when starting a 3 phase induction motor,first start with star connection,because reduced current is being applied and after start change it to delta connection then. full line current is applied to the motor.
What is the reason if you are running an electric motor with a star delta starter but whenever it is switched to delta at the same instant its circuit breaker trips?
Check your Delta connections first if the phases is corresponding, and check your Circuit Breaker if it sufficiently rated.
How do you install a 2000 Yamaha waverunner XL 1200 starter?
To install a 2000 Yamaha Waverunner XL 1200 starter, first remove the 2 bolts. Then the wires connected to the starter. Remove the starter and replace with new.
What configuration was the first successful prototype transistor at Bell Labs connected in?
Common base connection.
How do you remove a starter from a 02 impala?
I am currently having the same issue. First unhook the battery completely. Then you need to find where the wires on the starter are connected to the battery. Detach the wires from the starter that go to the battery. Once you have the starter wires completely detached from battery you can start removal of starter from engine block.
If your car won't start how can you tell if it is your battery or starter that is bad?
First, turn on the headlights. Now, have someone watch them as you try to start the car; do they get dim? If so, the battery is in need of a charge; If not, you need to check your connections at the starter. You may have a bad starter, starter solenoid, or connection.
Why does my boat makes a clicking sound when trying to start it?
You may also have a faulty starter solenoid or starter Your battery is low, or you have a bad connection in your cables. -I would try to charge your battery first, but if that doesn't help then go ahead and have your starter looked at! :)
Your 99 Saturn wont start The radio and lights come on but there is a screechingclicking sound.. what could this be?
Bad connection at the starter. Bad battery connection Dead battery Dead starter Check the first 3 with a voltmeter and your eyes. Check the start if needed at a local autozone/advanced auto
