NATIONAL ALUMINIUM COMPANY LIMITED - Rites

The acceptance test on the system shall be carried out by the supplier as per mutually agreed
test procedures to establish satisfactorily functioning of the system as a whole and each
equipment as part of the system.
Site Tests
The tests to be carried out on the equipment at pre pre-commissioning commissioning stage shall include
following but not limited to the following:
MCC
1. IR test before and after HV test.
2. HV test with 2.5 kV megger
3. Functional test for all feeders
4. Testing and calibration of all meters
5. Checking and calibration of protective relays as per supplier's commissioning manuals
6. Check operation of contactors from local and remote points
7. Checking of interlockings between incomers/bus coupler and other feeders.
8. Test to prove interchangeability of similar parts
9. Tests to prove correct operation of breakers at minimum and maximum specified
control voltages
10. Checking of earthing connection fo for neutral-earth earth bus, cable armour, location of E/F CT
etc. as per the scheme.
11. Check test, service and drawout position of all the breakers and operations of
mechanical flag indicator and electrical indication lamps.
12. Check functioning of various elect. sc schemes hemes like autochangeover signalling etc.
13. Breaker : IR value checking with breaker ON. Phase to phase & phase to earth and
between phases in off position
MOTORS
1. IR test of stator and rotor windings.
2. Ensure that checking/testing of associated switchboard
switchboard, , cables, relays /meter
interlocks as mentioned in relevant are completed.
3. Check tightness of cable connection
4. Winding resistance measurement of stator and rotor.
5. Checking continuity of winding.
6. Check tightness of earth connections.
7. Check space heaters and carryout heating of winding (if required)
8. Check direction of rotation in de de-coupled coupled condition during kick start
9. Measure no load current for all phases.
10. Measurement of temperature of body during no load and load conditions.
11. Check for tripping of motor from local/remote switches and from
electrical/technological protection.
12. Checking of vibration
13. Checking of noise level
14. Shaft voltage measurement (if required)
15. Tan delta test, if required
Technical Specification:Sec-6, Electrical
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