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Why 3 phase supply do not short on star contactor of star delta starter?
In a star-delta starter, the star contactor connects the motor windings in a star configuration during the initial start-up phase. This configuration reduces the voltage and current, allowing for a softer start and minimizing inrush current. If a short circuit were to occur on the star contactor, it could lead to a direct connection of the supply to the motor windings, potentially causing overheating and damage to the motor. Therefore, protective measures such as overload relays and proper circuit design are essential to prevent such occurrences.
How do you measre the running amps a star delta motor?
Measure the current on the incoming side of the starter.
Can you draw star delta diagram in PLC logic?
PLC logic is a digital computer used to automate electromechanical processes. The Star delta diagram is a diagram for a simple circuit that has the capabilities of starting a high horse power motor. A star delta diagram can be drawn in PLC Logic.
The block diagram of a star delta starter?
The Star/Delta starter is probably the most commonly used reduced voltage starter, but in a large number of applications, the performance achieved is less than ideal, and in some cases, the damage and interference is much worse than that caused by a Direct On Line starter.The Star/Delta starter requires a six terminal motor that is delta connected at the supply voltage. The Star Delta starter employs three contactors to initially start the motor in a star connection, then after a period of time, to reconnect the motor to the supply in a delta connection. While in the star connection, the voltage across each winding is reduced by a factor of (1 /.'/'3) [1 divided by root three]. This results in a start-current reduction to (1 /.'/'3) [1 divided by root three] of the DOL start current and a start torque reduction to one third of the DOL start torque.If there is insufficient torque available while connected in star, the motor can only accelerate to a partial speed compared to the full speed it would reach if connected in delta. When the timer operates (set normally from 5-10 seconds), the motor is disconnected from the supply and then reconnected in delta, resulting in full line voltage running currents and torque.The transition from star connection to delta connection requires that the current flow through the motor is interrupted. This is termed "Open Transition Switching" and with an induction motor operating at a partial speed compared to full load speed, there is a large current and torque transient produced at the poi, unless proper protection methods are used, can cause severe damage to the supply service's infrastructire and to other connected equipment.If there is insufficient torque produced by the motor when running in star, there is no way to accelerate the load to full speed without switching to delta and causing those severe current and torque transients. These must be allowed-for in the design of the motor and its starting system if they are to have an economic useful life.Update: Electronic motor-control systems, which offer soft-starts in DELTA configuration, are now replacing the use of manual or semi-automatic star-delta starters.Technical explanationWhen the windings of a 3-phase motor are connected in STAR:the voltage applied to each winding is reduced to only (1 /.'/'3) [1 divided by root three] of the voltage applied to the winding when it is connected directly across two incoming power service lines in DELTA.the current per winding is reduced to only (1 /.'/'3) [1 divided by root three] of the normal running current taken when it is connected in DELTA.so, because of the Power Law V [in volts] x I [in amps] = P [in watts], the total output power when the motor is connected in STAR is:PS = [VL x (1/.'/'3)] x [ID x (1/.'/'3)] = PD x (1/3) [one third of the power in DELTA]where:VL is the line-to-line voltage of the incoming 3-phase power serviceID is the line current drawn in DELTAPS is the total power the motor can produce when running in STARPD is the total power it can produce when running in DELTA.a further disadvantage when the motor is connected in STAR is that its total output torque is only 1/3 of the total torque it can produce when running in DELTA.For more information please see the answers to the Related Questions shown below.
What is the starting sequence of a star-delta starter?
This is the schematic for the starter. K1T is a timer. Initially KM1 and KM3 are closed to start the motor. Then KM2 is closed and KM1 is opened to run the motor This is the equivalent ladder logic using relays and timers.
Can you play Star Wars PC games on your normal computer?
Assuming your computer is Running windows, it is logical that all PC Games will work.
Are there any 3d horse games?
HuntAndJump. My horse club. Horse star, Although it might crash in the start, its worth it!
How do you start Star Wars Battlefront 2 extreme mod for computer?
hoi
What tv show used pi to crash a computer system?
Once on star trek Mr. Spock commands the computer to calculate pi to the last decimal place in order to keep it busy and out of evil control.
What Star Trek episode did Spock use the value of pi to crash the computer?
It was on the original Star Trek tv show. The computer was programmed to find the final digit of pi. As pi has no end, the computer was endlessly working on that which could not be solved. Credit to Mr. Spock, who was the Science Officer on board the Enterprise, and a Vulcan.
What heppens if a super nova crash on a star?
It will never happen.
Pi was featured as a key plot element during an episode of this popular science fiction show The very savvy Vulcan science officer used the calculatation of pi to crash the computer?
Star Trek
Star doll has virusis ban it for life it will complett ly ruin the internet for the computer?
yes it has something that u or uses adobe flash player and it cuases it to crash or brake apps like skype
Who got sued after the crash of the Titanic?
The White Star Line Property
Who was an all-star that died in aplane crash in 1972?
Roberto Clemente
What was the computer called in Star Trek series?
Computer
How do Cushion star move?
running
