Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 41 of 63
5.0 Quality of operation
i) Vibration intensity Limited to 37.5 micron peak to peak.
ii) Noise level Continuous noise level should not exceed
85 db A at a distance of 1.0 m from the
motor body as per IS: 12065-1987.
iii) Balancing Dynamically balanced with full key on shaft
end and fan
6.0 Electrical design
i). Efficiency High efficiency design of 96% at Full load
ii) Starting DOL
iii)
Min Voltage for Start &
Run
80 % of rated voltage at terminal
iv) Starting Torque As specified in application
v) Starting current <= 600% Rated current
vi) Duty S1
vii) Starts permissible 3 successive start from cold condition OR 2
successive start from hot condition.
viii) Starts / hour
3 equally spread in normal Voltage,
Frequency & Load
ix) Max speed permissible 150 % rated for 2 minutes
x) Differential protection Required for1000 kW & above
xi) Insulation Class F & confirming to IEC 34 -15/1990
xii) Insulation Material Cast resin rich / VPI
xiii) Minimum Permissible
temperature rise
Limited to class 'B' (120 deg absolute)
xiv) Space Heater Required & automatically off during RUN
xv) No. of Poles 4 (or as mentioned specifically)
xvi) Locked rotor current
withstand time
5 sec longer than starting time under rated
load condition.
xvii) Surge protection As specified
xviii) Operational design Suitable to VCB Breaker
xix) Motor winding and inter
turn insulation,
connections and leads:
Shall be fully insulated using mica
insulation. For such motors surge absorbers
(with non-linear resistance) shall be
provided within 10 to 15 meters from the
motor terminals to limit the over voltages.
OR In case mica is not provided in motor
insulation, both surge capacitors and surge
absorbers (with non-linear resistance) shall
be provided within 10 to 15 mtrs from the
motor terminals to limit the over voltages
and rate of rise of voltage
04. SYNCHRONOUS MOTORS
2.0
Constructional
Features
i). Frame size & rating As per IS 325
ii) Stator Frame Fabricated Steel / High grade cast Iron
iii) Stator Core
Laminated sheets of high grade low loss
silicon steel