Monday, 6 February 2012

Motor Facts

Upto 30 KW DOL starters are used, above that, y-Delta starters are used.

For motors rated 55 KW+, motor heaters are used.

For motors rated /. 90 KW, PTC Thermisters are used.

For all motors rated 90 KW +, the vendor should furnish following data soon after submission of T-S curves and G D sqaure value of the driven equipment:- (This data is required for selection of proper motor protection relay).
  • Thermal Withstand Curve: Hot and Cold.
  • Stator Time Constant.
  • Stalling Current.
  • Stall Withstand:Hot and Cold
  • Starting Current.
  • Acceleration Time.

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