DOL Stater
- A DOL starter (or Direct On Line starter or across the line starter) is a method of starting of a three phase induction motor. In DOL Starter an induction motor is connected directly across its three phase supply, and the DOL starter applies the full line voltage to the motor terminals. Despite this direct connection, no harm is done to the motor. A DOL motor starter contains protection devices, and in some cases, condition monitoring.
- When a motor draws excessive current to meet the load requirements such that this load requirement goes beyond the rated limit, this is known as overload.
- Thermal overload protection is a type of security when the motor draws over current or excessive current and causes overheating of the equipment. Overload is also the type of over current.
- So overload relays are employed to limit the amount of current drawn. But that does not mean that protects the short circuit.
- Fuse or MCB used in the system protects the over current. Overload protection opens a circuit at relatively low currents that are a little higher than the rating of the motor.Overload currents are likely to damage if they persist for a long time, i.e. it will not trip if a high value of current flows for a short period such as starting of the motor.
- We often provide overload protection via an overload relay. Overload relays may be solid-state devices with adjustable trip setting also called as the electronic relay or by interacting with related temperature sensors called as a thermal relay or if only operates for excess current flow then called as a magnetic relay.
- For most motors, the maximum rating of the overload protection device is 125% of the full load ampere rating.
↓↓↓↓↓↓ Photos ↓↓↓↓↓↓
👇Follow us on Social Media👇
YouTube Channel🎥 :- www.youtube.com/deepakkumaryadav02
Instagram📸 :- www.instagram.com/deepakkumaryadav02