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A Direct On Line (dol) Motor Starter Or Over The Line Starter Applies The Full Line Voltage To The M
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This is the simplest sort of Motor Starter. A DOL Motor Starter likewise has protection gadgets and, now and again, condition monitoring. Littler sizes of direct on-line starters are manually worked; bigger sizes utilize an electromechanical contactor (transfer) to switch the motor circuit. Strong state DOL starters additionally exist.
A DOL Starter can be utilized, if the high inrush current of the starter motor does not cause over the top voltage drop in the supply circuit. The most extreme size of a motor permitted on a Direct On Line Starter might be restricted by the supply utility hence. For instance, an utility may require rustic clients to utilize decreased voltage starters for motors bigger than 4KW (5HP).
DOL Starter is once in a while used to begin little water pumps, compressors, fans and conveyor belts.
On account of an asynchronous motor, for example, the 3-stage squirrel-confine motor, the motor will draw a high starting current until the point that it has to keep running up to full speed. This starting current is normally 6-7 times more prominent than the full load current. To diminish the inrush present, bigger motors will have decreased voltage starters or variable speed drives keeping in mind the end goal to limit voltage plunges to the power supply or arrangement protection and inductance can be included.
Distinctive Starting techniques are utilized for starting enlistment motors since Induction Motor draws all the more Starting current amid Starting. To counteract harm to the windings because of the high Starting current stream, we utilize diverse sorts of starters.
The least difficult type of motor starter for the enlistment motor is the Direct on Line starter. The DOL starter comprises a MCCB or Circuit Breaker, Contactor and an over-burden transfer for insurance. Electromagnetic contactor which can be opened by the warm over-burden transfer under blame conditions.
Regularly, the contactor will be controlled by partitioned begin and stop catches, and a helper contact on the contactor is utilized, over the begin catch, as a hold in contact. I.e. the contactor is electrically hooked shut while the motor is working.
The principle of DOL Motor Starter:
To begin, the contactor is shut, applying full line voltage to the motor windings. The motor will draw a high inrush current for a brief span, the attractive field in the iron, and after that, the present will be constrained to the Locked Rotor Current of the motor. The motor will create Locked Rotor Torque and start to quicken towards full speed.
As the motor quickens, the present will start to drop, however, won't drop essentially until the point when the motor is at a fast, normally around 85% of synchronous speed. The genuine beginning current bend is a component of the motor plan, and the terminal voltage, and is absolutely free of the motor load.
The motor load will influence the time taken for the motor to quicken to full speed and in this way the span of the high Starting current, yet not the greatness of the Starting current.
Given the torque created by the motor surpasses the heap torque at all velocities amid the beginning cycle, the motor will achieve full speed. On the off chance that the torque conveyed by the motor is not as much as the torque of the heap at any speed amid the beginning cycle, the motor will quit quickening. On the off chance that the beginning torque with a DOL starter is lacking for the heap, the motor must be supplanted with a motor which can build up a higher Starting torque.
The increasing speed torque is the torque created by the motor less the heap torque and will change as the motor quickens because of the motor speed torque bend and the heap speed torque bend. The begin time is subject to the speeding up torque and the heap inactivity.
DOL Starting has a most extreme begin present and greatest begin torque. This may cause an electrical issue with the supply, or it might cause a mechanical issue with the determined load. So this will be badly arranged for the clients of the supply line, dependably encounter a voltage drop when beginning a motor. Be that as it may, if this motor isn't a powerful one it doesn't influence much.
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