Method Statement Title: Testing and Commissioning of Bus Duct System
1.0 Scope
1.1 This method statement details the Testing and Commissioning of Bus Duct System in accordance to the specification section 16450.
2.0 Material
- All the materials shall be as per approved material submittals.
- Size and number of Bus Duct as per approved shop drawing .
- Identifications and labels.
3.0 Applicable Location
- L.V. room & Electrical Closet in E1,E2,E3 & W1,W2,W3 Towers.
4.0 Instruments.
- Insulation Resistance tester (Megger) with variable Voltage selection.
- Micro Ohm meter.
- Torque tightness.
- Phase sequence meter.
Note : The instruments used for testing and commissioning shall be checked and ensured that they are calibrated and the current valid calibration reports are filed for record.
- Inspection Procedure :
(Refer Enclosed Test Format.)
- Visual, Mechanical and Operational checks as per the format enclosed.
- Test Procedure :
(Refer Enclosed Test Format.)
- Insulation Resistance Test using 500V Megger:
- Check the tightness of connections.
- Clean all the supporting insulators.
- Isolate the cables on incoming and outgoing side.
- Apply a megger voltage of 500Volts DC between Phase ‘R’ to earth for 1 min with Phase ‘Y’,’B’ & ‘N’ shorted and earthed and record the values.
- Similarly continue the test and record the values for the other phases.
- Contact Resistance Test:
- Connect the test leads of Micro ohmmeter as instructed below.
- Connect the voltage leads across the contacts were contact resistance is to be measured.
- Connect the current cable on either side of the contacts were contact resistance is to be measured. ( The current leads must be connected after the voltage leads.)
- Switch on the power supply to the Micro ohmmeter.
- Select the current range of 100A D.C. in the Micro ohmmeter. Vary/Adjust the variac, so that 100A D.C. is displayed in the Micro ohmmeter.
- Press/Switch on the Resistance measuring button in the Micro ohmmeter.
- The value for which the contact resistance measured will be displayed in Micro ohms.
- Tabulate the test results.
- Safety :
- Only experienced and skilled personnel shall be engaged for testing.
- Safety guards shall be in place and secured prior to start-up.
- Warning signs and tapes shall be placed during start-up and commissioning as required.
- All safety procedures shall be followed in accordance with the project health and safety plan.
- Safety officer shall check and ensure all safety precautions as followed.
- Records:
- Inspection request duly signed-off by NMX and Consultant.
- Caliberation certificates of testing instruments.
9.0 Reference :
- Specification Section 16450.
- Approved Drawings.
