Ref Number: ACSB/SKO/W/SUM/1
WORKPACKACTIVITY : PLATFORM EQUIPMENT : WO NUMBER : SWITCHGEAR & MCC MAINTENANCE : TEMANA PLATFORM GS100, MCC-100, MCC-101
PERSONNELPREPARED BY: REVIEWED BY:
NAME Mohammad Yusmin Azmi Ahmad M Syakiq Mat Sihat BME Manager
POSITION ACSB ENGINEER ACSB MANAGER PCSB ENGINEER PCSB MANAGER SECTION HEAD
TABLE OF CONTENTS 1 21.1 2 1.2 2 1.3 3 2 Field Background Project Background Equipment Details & Specifications
DETAILED WORK SCOPE 4 2.1 Work Procedure 2.2 Work Planning 11 MANPOWER LOADING 3.1 Manpower List 3.2 Organization Chart 14 3.3 PCSB Focal Person 15 3.4 HSE Requirement 15 3.4.1 Toolbox Meeting 3.4.2 PTW 3.4.3 JHA TOOLS & MATERIALS LIST 17 4.1 Tools & Parts Require 17 4.2 Lifting Plan 18 PROJECT DETAILS 5.1 Project Schedule 21
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1 INTRODUCTION1.1 Field Background Temana Platform 1.2 Project Background This shutdown maintenance and services of the switchgear and MCC at Temana platform is to maintain the equipment as per routine activity as per below: a) Shall perform visual inspection for damage, overheating, corrosion, cracked insulation and loose terminals.b) Shall perform general cleaning on switchgear (ACB, MCC, busbar,
compartment, etc). c) Shall perform insulation resistance for contactor and circuit breaker.d) Shall perform continuity check by measuring closed contact resistance of
contactor.e) Shall verify conductivity, continuity and integrity of the busbar assembly,
switchgear earthing and bonding. f) Shall perform functional check on switchgears and MCC inclusive of control systems and electrical/mechanical interlocks.g) Shall verify the ACB and MCC panels operation and interlocks.
h) Shall verify the control wiring system against the schematic diagram. i) Shall inspect and service MCC contactors and circuit breakers for condition, alignment and correct setting. j) Shall troubleshoot and rectify any switchgear and MCC having abnormalities. k) Shall perform testing and recording data.l) Shall perform tightening for any losing part.
m) Shall perform cleaning
1.3 Equipment Details & Specifications Lists below show the switchgears and MCC involved during shutdown maintenance:
2 DETAILED WORK SCOPE2.1 Work Procedure
2.1.1ACB Panel Servicing & Testing i. ii. iii. iv. PTW and IEC Cert shall be approved by PCSB before work commences. Switching (De-energize) to be done by PCSB Chargeman. Contractor to confirm no supply from ACB using HV Test Pen. Switchgear Panel to be placed at the Earth Position. Before inspecting or performing any maintenance on either the breaker or its mechanism, be sure the breaker is in the open position. Both the closing and opening, springs should be discharged or blocked mechanically before any maintenance is done. Compare nameplate data with drawings and specifications. Inspect circuit breaker for correct mounting. Operate circuit breaker to insure smooth operation. Inspect case for cracks or other defects. Inspect all bolted electrical connections for high resistance. Inspect mechanism contacts and arc chutes in unsealed units. Inspect anchorage, alignment, and grounding. Inspect moving and stationary contacts for condition, wear, and alignment. Perform a contact-resistance test. Microhm drop values shall not exceed the high levels of the normal range as indicated in the manufacturers published data. If manufacturers data is not available, investigate any values which deviate from similar connections by more than 50 percent of the lowest value. Perform an insulation-resistance test at 1000 volts dc from pole-to-pole and from each pole-to-ground with breaker closed and across open contacts of each phase. Circuit 6
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breaker insulation resistance should be in accordance with attached appendices table for minimum IR value. Clean the area of arc chutes until thoroughly clean and ensure the arc chutes are clear of contamination and have no significant damage on grids or ceramics. Perform cleaning and lubricate the ACB contacts (aux, finger) and linkages Determine IR and contact resistant measurement after servicing. Check on earthing system, alignment and rack condition. Report on abnormal findings immediately to PIC. Check for leftover tools and consumables. Rack in the breaker to service position.
2.1.3 MCC Servicing and Testing i. ii. iii. iv. v. vi. vii. viii. PTW and IEC Cert shall be approved by PCSB before work commences. Compare equipment nameplate data with drawings and specifications. Inspect physical and mechanical condition. Inspect all bolted electrical connections for high resistance Test all interlocking systems for correct operation and sequencing. Inspect all indicating and control devices for correct operation. Perform cleaning and servicing on contact, surface, internal component and structural of MCC & proper lubrication. Perform insulation-resistance tests on each pole, phase-tophase and phase-to-ground with switch closed and across each open pole for one minute. Test voltage and minimum insulation resistance shall be in accordance with manufacturers published data or attached table on appendices Report on abnormal findings immediately to PIC. Check for leftover tools and consumables.
2.1.4 Busbar Servicing and Testing i. ii. PTW and IEC Cert shall be approved by PCSB before work commences. Switching (De-energize) to be done by PCSB Chargeman. 7
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Contractor to confirm no supply from busbar using HV Test Pen. Before perform electrical test, ensure the entire load (breaker, MCC, CT, VT and fuses) to busbar is disconnected. Compare equipment nameplate data with drawings and specifications. Inspect busbar for physical damage and correct connection in accordance with single-line diagram. Inspect all bolted electrical connections for high resistance. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method Measure insulation resistance of each busbar, phase-tophase and phase-to-ground for one minute. Insulationresistance test voltages and resistance values shall be in accordance with manufacturers published data or attached table on appendices. Minimum resistance values are for a nominal 1000 foot busbar run. Perform contact-resistance test on each connection point of non-insulated busbar. Compare bolted connection resistances and bus joint resistances to values of similar connections. Microhm drop values shall not exceed the high levels of the normal range as indicated in the manufacturers published data. If manufacturers data is not available, investigate any values which deviate from similar connections by more than 50 percent of the lowest value. Perform general cleaning on busbar Apply all new silicon sealant to all busduct joint and gasket. Measure IR and contact resistance after service. Report on abnormal findings immediately to PIC. Check for leftover tools and consumables. Closed the busbar compartment.
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2.1.5 Testing Procedure A. Insulation Resistance Test Procedure before Performing Insulation Resistance Test i. The system or equipment is taken out of service and disconnected from all other circuits, switches, capacitors, brushes, lightning arrestors and circuit breakers. (Make sure the measurements are not affected by leakage 8
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current through switches and over current protective devices. The temperature of the conductor is above the dew point of the ambient air. When this is not the case, a moisture coating will form on the insulation surface and in some cases will be absorbed by the material. The surface of the conductor is free from carbon and other foreign matter that can become conductive on humid conditions. Applied voltage is not too high when testing low voltage system. Too much voltage will damage the insulation. The system under test needs completely discharged to the ground. The grounding discharge time should be about five times the testing charge time.
Safety Procedure on Insulation Resistance Test i. ii. iii. iv. Never connect the insulation tester to energized conductors or energize equipment and always follow manufacturers recommendation. Shut down the equipment to be tested by opening fuses, switches and circuit breakers. Disconnect the branch circuit conductor, grounding conductor and all other equipment from the unit under test. Discharge conductor capacitance, both before and after the test. Some instrument may have automatic discharge functions. Check for any leakage current through fuses, switches and breakers on de- energized circuits. Leakage current can cause inconsistent and incorrect reading. Do not use an insulation tester in dangerous or explosive atmosphere since the instrument can generate arching in damaged insulation. Use insulated rubber glove when connecting the test lead.
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Procedure of Insulation Resistance Test i. ii. Use multimeter or voltmeter to make sure there is no power applied to the tested circuit. Set the voltage level to as per table attached on appendices depend on equipment. E.g. 1000V for LV switchboard (ACB, MCC) and 2500V for MV switchboard (VCB). 9
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Plug one end of the black test lead to the common terminal on the meter end and touch the test probe to the ground or another conductor. Sometimes it is helpful to ground all conductors that