dol starter connection 3 phase motor। ডল স্টাটার।#Tusher electric bd

DOL Starter (Direct Online Starter) is also knows as “across the line starter”. DOL starter is a device consist of main contactor, protective devices and overload relay which is used for motor starting operations. It is used for low rating usually below 5HP motors.In direct online starter method of motor starting, the motor stator windings is directly connected to the main supply where the DOL protect the motor circuit from high inrush current which may damage the overall circuit as the initial current is much more higher than the full rated current. Protection Offered by DOL Starter: The Motor starters not only provide the safe starting current but also provide protection to keep the motor safe during operation. It is clear that the DOL starter provides the full line voltage but it does provide the following protection: Overcurrent Protection: The condition that causes the flow of a faulty current in a large amount mostly due to a short circuit or ground fault is called overcurrent.The overcurrent condition can cause damage to the motor, power lines and can be a hazard for operators. Such an amount of current is too dangerous for a brief moment.In the DOL starter, we use a circuit breaker or fuses for protection against overcurrent. They open the circuit and breaks the current flow in an instant until the problem in the system is resolved. The fuse or circuit breaker is carefully selected with its rating kept in mind. Because we do not want the fuse to break but to tolerate the starting current as well as the heavy load current. The overcurrent breaker’s rating is kept a bit higher than the rated starting current of the motor. Working of DOL Starter: The DOL starter connects the 3 phase voltage supply i.e. R-phase, Y-phase and B-phase to the induction motor terminals. There are two types of circuits in the DOL starter diagram given above; The control circuit and the power circuit. The Control Circuit: It is powered by only 2 phases of the power supply and it is responsible for starting and stopping the power supplied to the motor. The green start button and red stop button is connected inside the control circuit. Pressing the green button for an instant starts the motor and the power is supplied when it is released. Pushing the red button stops the power supply and stops the motor. Applications: 1.The DOL starters are used for motor having low power ratings. 2.Where the starting current does not damage the windings of the motor. 3.For applications where the starting current does not cause huge dips in the line voltage. 4.Direct online starters are used for small water pumps, conveyor belts, fans and compressors. If you have any questions, please comment below the video. I will answer your questions. Thanks for watching this video. PLEASE SUBSCRIBE THIS CHANNEL FOR MORE VIDEOS:    / @tusherelectricbd   🌐Facebook   / tusherelectricbd   MORE VIDEOS Star Delta Starter for 3 Phase Induction Motor / Star Delta Connection    • star delta control wiring in bangla   What is substation    • What is Substation / সাবস্টেশন কি/how to s...   How to calculate cable size    • সহজে কেবল সাইজ নির্ণয়।how to select cable...   How to calculate Amper from wait    • How to calculation ampere from watt in bangla