PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

4. Detail Particulars :
The technical particulars of the motors shall be closely matched with the
characteristics of the pumps. The motors shall be started with star delta starters.
Other details specification of the motors shall be as follows:
Duty : Continuous
Rating : To be decided as per requirement of the driven equipment
stipulated in the technical specification subject to min.
45Kw.
No. of Poles : 4
Frame size : As per IS/other relevant ISO/IEC standards
Mounting : Horizontal, Foot mounting (for vertical motors)
Method of starting : Star/Delta
Insulation of stator : Class ‘F’ with 70° temp rise over 50° ambient winding
Starting Torque : 200% of FLT
Pull out Torque : 250% of FLT
Starting current : Shall be limited to 300% of FLC for FASD starting with
100% voltage at motor terminals (subject to IS tolerance)
Starting time : Shall be within 10 sec
Terminal box : Suitable for PVC-Al, 3C power cables of required size.
Construction : TEFC/CACA, squirrel cage.
Encloser : IP:55 as per IS:4691.
The motors shall deliver the rated output & accelerate the full speed with 85% of
the rated voltage at the motor terminals.
Each motor shall be capable of at least two cold restarts & one hot restart. The
motors shall be suitable for 3 equipaced starts per hour under all operating
conditions.
Each motor shall be capable of withstanding the stress developed due to sudden
application of 150% of rated voltage at the motor terminals during bus transfer due
to phase difference between the incoming voltage & motor residual voltage.
Locked rotor withstand time under hot condition at 110% rated voltage shall be
more than the motor starting time by at least 5 sec. The starting time mentioned
above shall be at minimum permissible voltage of 80% rated voltage.
DTS : Detailed Tender Specification. Page 195