200 HP Motor Start Time
200 HP Motor Start Time
(OP)
Hello all, I've got a 200 HP Motor powered by a 400 kVA transformer with 3.68% impedance. This motor is full-line starting. This motor is the only load on this transformer other than a small lighting panel ~20 kVA.
Having said this, the customer who owns this transformer is telling me the 200 HP motor is taking 10 seconds to start. The motor has been operating like this for a few years now and has not had any "problems" starting in this fashion.
For someone who has worked with motors this large, Is the starting time I described typical for a motor this large or unusual? What would be a typical start time for a motor this large?
Having said this, the customer who owns this transformer is telling me the 200 HP motor is taking 10 seconds to start. The motor has been operating like this for a few years now and has not had any "problems" starting in this fashion.
For someone who has worked with motors this large, Is the starting time I described typical for a motor this large or unusual? What would be a typical start time for a motor this large?






RE: 200 HP Motor Start Time
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 200 HP Motor Start Time
This is a NEMA Design B motor. KVA Code = "H". FLC = 231 Amps.
I will try to find what the load typically is during this investigation.
I do know the motor is started/stopped around 6 times a day.
RE: 200 HP Motor Start Time
RE: 200 HP Motor Start Time
The inertia of the load is the most important but a motor with a cyclic load that starts and idles before full load is applied or a motor with less than the full 200 HP load may be more forgiving than a motor that starts loaded and continues to run at 100% load.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 200 HP Motor Start Time
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: 200 HP Motor Start Time
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies