Is it really ok to start a motor direct on line if it's starting current is 6 times the full load current? In my country, it's ok for a single phase induction motor up to 3 hp to start direct on line, as long as it's starting current is not greater than 3 times it's full load current, and not greater than 1.5 times it's full load current if it's a 5 hp single phase induction motor. If motor's power is greater than 5 hp, it can only be 3 phase. For 3 phase induction motors, the starting current has to be limited up to 1.5 times the full load current. Our voltage levels for low voltage are 230 volts single phase and 400 volts three phase, with 5% tolerance and nominal frequency of 50 Hz
learned a lot. Not in this field but it was like a great intro
Thanks 🙏
Is it really ok to start a motor direct on line if it's starting current is 6 times the full load current? In my country, it's ok for a single phase induction motor up to 3 hp to start direct on line, as long as it's starting current is not greater than 3 times it's full load current, and not greater than 1.5 times it's full load current if it's a 5 hp single phase induction motor. If motor's power is greater than 5 hp, it can only be 3 phase. For 3 phase induction motors, the starting current has to be limited up to 1.5 times the full load current. Our voltage levels for low voltage are 230 volts single phase and 400 volts three phase, with 5% tolerance and nominal frequency of 50 Hz
What is the main reason when the motor pump keeps on tripping during the start-up ?
How do you estimate if the transformer is partially loaded for example the transformer is already 50% loaded?
Time 6:42. What happens to the demand if all motors are all started within 15 minutes Direct on line as compared to soft starter?