Number of start of high voltage motor
Number of start of high voltage motor
(OP)
What is the meaning of 6 starts per hour for High voltage motors?
Is there any relation with 3 cold start and 2 hot start with 6 number of starts?
Can I get any informative weblinks in the internet?
Example : 740 Kw, 993 rpm, 50HZ motor, 11kv
Is there any relation with 3 cold start and 2 hot start with 6 number of starts?
Can I get any informative weblinks in the internet?
Example : 740 Kw, 993 rpm, 50HZ motor, 11kv





RE: Number of start of high voltage motor
There is do direct relation between number of starts defined as 'X per hour' and 'Y consecutive starts' (eg. 3 from cold state (the first when motor is at ambient temp.) OR 2 from hot state (=first 'hot' start when motor is at rated thermal condition). Starting capabilities of particular type o motor shall be defined by the manufacturer.
RE: Number of start of high voltage motor
It's actually a little work to track because you need to retain the 6 start times so that you can add-in another start as an hour passes after each of the 6 starts then record that next start as the 6th start and drop the one that has already passed the hour.
RE: Number of start of high voltage motor
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RE: Number of start of high voltage motor
They comply the standard of manufacture or the customer requests.
The number of starts is close linked to the load inertia since the starting time and the heat developed during each start are proportional to the load inertia.
A constant of inertia like Wk2(Lb*Ft2) or GD2( kgm2) maximum limit, as well as the allowed number of starts are provided in a nameplate attached to the motor.
By the way, 6 starts per hour is far away from normal motors capacity, that should be an extremely light load inertia, other way the rotor or stator windings will be roasted.
RE: Number of start of high voltage motor
Bill
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"Why not the best?"
Jimmy Carter
RE: Number of start of high voltage motor
3 cold starts is illogical. Once the first start is performed the motor is no longer at ambient or "cold".
RE: Number of start of high voltage motor
RE: Number of start of high voltage motor
RE: Number of start of high voltage motor
RE: Number of start of high voltage motor
http://fi
I get the hardcopy of the magazine which includes figures, but somehow I missed this article this past June.. can't find my hardcopy ;-(
I have added this link to the FAQ on repetitive motor starting.
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RE: Number of start of high voltage motor
The information provided is useful for furthur study of individual interest. However Article not concluded our topic only answered.
Final conclusion to this topic is Motor (High voltage, High rating motors)number starts will be depends on the requirement of end user. The end user requirements can be fulfilled by the manufactuer.
However interested people can read for exact information from NEMA MG 1/MG 100 standard.