Enquiry Specification for Wagon Tippler with Side Arm Charger and ...

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
7.0 Excitation method Brushless excitation system (Integral
exciter and rotating rectifier assembly to
eliminate the need for brushes and slip
rings both on exciter and motor
respectively) .
8.0 Automatic system power
factor correction.
9.0 Motor synchronism
protection
Motor field to have micro processor based
thyristor controlled static excitation system
(for automatic system power factor
correction).
Field monitor relay to be provided for
monitoring the power factor of the system
which in turn trips the motor and the
exciter field off if synchronism is not
achieved within a specific length of time or
if the motor pulls out of step .
10.0 Insulation class Class F insulation for field windings as well
as for stator with temperature rise limited
to 70 deg. C (as measured by resistance
method) over an ambient of 50 deg. C.
11.0 Locked rotor withstand
time
Motors shall be capable of withstanding
locked rotor current for atleast 5 second
longer than starting time under rated load
condition.
12.0 Starting method DOL / Auto transformer starting method /
Load commutated inverter (LCI)
13.0 Space Heater Space heater to be provided.
EPI – New Delhi Volume-2B, Rev.0 Page 44 of 63