Darect on line statar

Around the world it famous with name DOL starter or direct on line starter.

This is the most common starting method available on the market and at basic stater for all motor application.

The starting equipment consists of only a main contactor and thermal or electronic overload relay.

Darect on line statar-56Darect on line statar-36Darect on line statar-35

A normal value is between 6 to 7 times the rated motor current but values of up to 9 or 10 times the rated current exist.

Besides then DOL starter draw the starting current there also exists a current peak that can rise up to 14 times the rated current since the motor is not energized from the the first moment when starting.

The values are dependent on the design and size of the motor, but in general, a smaller motor gives higher values than a larger one.

During a direct on line start, the starting torque is also very high, and is higher than necessary for most applications.

The torque is the same as the force, and an unnecessary high force gives unnecessary high stresses on couplings and the driven application.

Naturally, there are cases where this starting method works perfectly and in some cases also the only starting method that works. He has published numbers of Technical Articles in "Electrical Mirror", "Electrical India", "Lighting India","Smart Energy", "Industrial Electrix"(Australian Power Publications) Magazines. He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad, India. He is member of Institution of Engineers (MIE), India. He has more than 14 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution).He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC, IEEE codes.He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages.

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