Setting of Differential Protection of Motor
Setting of Differential Protection of Motor
(OP)
Hi, Guys,
Could you direct me to the reference of settings of motor differential protection?
Thanks.
Could you direct me to the reference of settings of motor differential protection?
Thanks.





RE: Setting of Differential Protection of Motor
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There is no standard formula or chart like lays out diff amps per phase per horsepower. (That I've ever found, or been told of)
That said, what size, voltage and winding arrangement are you working with in your present application? I'd approach it as a % of full load current.
Last I used one, I used a Square-D unit, and set it according to the literature enclosed with the unit. The general idea was "as low as you can get away with". Since the control panel was for use of a 3rd party I had no feedback as to what settings were settled on,or if there was any value at which nuisance tripping occurred.
.
remember: An opinion is only as good as the one who gives it!
RE: Setting of Differential Protection of Motor
My understanding is, the latter scheme uses non-percentage differentila relay. Is that right?
RE: Setting of Differential Protection of Motor
Determination of the settings for motor differential is just a question of setting it as low as possible while avoiding nuisance tripping on inrush.
RE: Setting of Differential Protection of Motor