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Singapore Power
- 1. School of Engineering Two-monthsIndustrial Attachment Programmed With SP POWERGRID LTD 2014 Internship Programmed 22 Dec 2014 to 27 Mar 2015 Student Name: Muhammad Suradi Bin Ithnin Contact Number: 81213059 Internship: Customer Project East Section (CPE) Supervisor: Mr. William Officer: Raj 1
- 2. Project/ AssignmentDetails Testing and commissioning of LV Board and OG Board Assist in service connection jobs and major works projects Support the inspection, installation, testing & commissioning of LVB and OGB Recommend improvements to processes so as to ensure compliance with technical specifications and engineering standards 2
- 3. Summary Customer ProjectsEast (CPE) section is obligated to handle customer projects at distribution level in Eastern part of Singapore. CPE, led by Deputy Tony Yeo Cheng Hee has a total workforce of 90 people and is divided into zones consist of senior officers, junior officers, administration group, fitter and miscellaneous group. Each zone will be taking charge of different areas in the Eastern Part of Singapore.The key responsibility of the section is to implement and timely complete the distribution projects to meet local growth and customer demand. Apart from that, CPE section also executes disconnection & reconnection requests from SP Services for both Contestable Customers & Non- contestable Customers. I was posted to CP-East under zone 3. Zone 3 covers the Eastern part of Singapore. 3
- 4. Safety Pledge Safety Pledge Safety is our highest priority Every life is precious Every accident is avoidable We uphold safe practices and strive for zero accident Group Structure 4 Singapore Power SINGAPORE OPERATION AUSTRALIA OPERATION SP POWERASSETS SP TRANING AND CONSULTANCY COMPANY SP AUSNET (51%) POWERGAS SP TELLECOMMUNICATIONS SPI MANAGEMENT SERVICES SP POWERGIRD SINGAPORE DISTRICT COOLING (60%) JEMENA SP SERVICES POWER AUTOMATION (51%) ZINFRA
- 5. Com Session Safety Awareness They will have a safety talked once a month. Before the talked, they will have a safety pledge. The talked consists of safety pledge, safety alert, accidents, safety awareness, safety advice (What are the do’s and don’ts). Every worker will be issued a card containing the safety pledge 5
- 6. Safety Awareness Duringmy internship I have notice that there are posters about safety around the office. Example of posters like wearing proper attire for Personal Protective Equipment (PPE) and handling live equipment. 6
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- 8. LV Board Twotypes of LV Board 6.6KV substation and 22KV substation incoming Used for Distribution of electricity supply at Low voltage Located inside a substation 6.6kV substation LVB(Old) 22kV substation LVB Distribution units Transformer
- 9. Fuse Sizes forLV Service Cables 9 Cable Size Fuses Used 35mm² 2/C Cu 100A 35mm² 4/C Cu 100A 120mm² 4/C AI 400A if 200A back- up fuses are installed at customer switchboard; 200A otherwise. 185mm² 4/C AI 400A 300mm² 4/C AI 400A 300mm² 4/C Cu 500A/ 630A 4 X 500mm² 1/C Cu 630A 7 X 500mm² 1/C Cu Large service units are used. Otherwise solid links shall be used in placed of fuses.
- 10. LV Board BrandGRID Danger sign Fuse Incoming cable 500mm² Outgoing cable 300mm² 10
- 11. LV Board Commissioning ofLow Voltage Board 1. Ensure that the insulation floor mat is placed in front of LVB 2. Check the copper braid of the LV cables are tightened to the earth bar of LVB 11
- 12. LV Board Commissioning ofLow Voltage Board 3. Check all earthing points are tightened 4. Check the transformer neutral incoming link is tightened to the neutral bar of LVB 12 Neutral Incoming Link
- 13. LV Board Commissioning ofLow Voltage Board 5. Check that the bus-coupler and transformer incoming links are in open position. 6. Ensure that the transformer incoming links remain open as long as the transformer is not energised 13
- 14. LV Board Commissioning ofLow Voltage Board 7. Ensure all LV cables terminated at LVB are properly tightened 8. Ensure all outgoing LV cable terminated are installed with earth fault indictor; 14
- 15. LV Board Commissioning ofLow Voltage Board 9. Ensure that no fuses/ links are inserted in each distribution units 10. Ensure that the rating of the fuses to be used for the respective cables is in line with that as shown in SPPG-ND-OI-DC (Proj-TS)-02; AND 15 Fuse Blow 1) Cable fault 1) Overloading 1) Ageing Fuse
- 16. LV Board Commissioning ofLow Voltage Board 90s old LV Board fuses used for 6.6kV substation 11. Check substation auxiliary supply cables are terminated properly 16
- 17. 6.6kV Substation LVBoard(Old) 17 Fuse to let the supply flow. Labeling is to indicate which unit is being used or spare SPPA LVB (Special Procedures)
- 18. 6.6kV Substation LVBoard(Old) 18 All earthing cable will be terminated at the earthing point.
- 19. 22kV Substation LVBoard(Old) 19 OG Board termination
- 20. LV Board AuxiliarySupply 20 Single Phase
- 21. LV Board Upon commissioningthe LVB, Project Officer shall 1. Check the voltmeter and the selector switch are functioning properly 2. Check the voltage at LVB is 230V±6% phase to neutral and 400V ±6% phase to phase 21 Voltmeter
- 22. LV Board 3. Ensurethat the phase sequence of LV cable is correct 4. Ensure LVB doors are closed and locked properly before leaving site
- 23. LV Board Upon commissioningthe LVB, Project Officer shall 5. Turn on the auxiliary supply to the substation 23
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- 26. Glossary 26 In the Eventof Emergency Term Contact number Example of Event ESC 6778 8888 1. Circuit Breaker trips 2. Black out 3. Public complaint of no supply 4. Swgrg panel’s Alarm indicator “ON” 5. Diversion 3-4hours
- 27. OG Board Before enteringa substation. The Project Official required to get a key for the OGB. 27 M(Master)2(22kV substation)N(North)=M2N M(Master)6(6.6kV substation)N(North)=M6N
- 28. OG Board Howto identify? 28
- 29. OG Board 29 Cable size:35mm² 2 nos of service cable in one single unit Fuse: 100/200A Cable size: 300mm² 3 Phase
- 30. OGB Earthing Earthinglocated at cable armoring. The armoring is connected to Substation Low Voltage Board It is then connected to the Earth point located at the Basement of Substation. Trench Main Earth
- 31. OG Board Installation ofOverground Distribution Board 1. The Project Officer shall: 2. Indicate clearly to the Contractor the exact orientation and position of OGB to be installed; 3. Ensure that adequate space is available around the OGB for jointing and network operation and maintenance; and 4. Ensure that the OGB installation checklist is properly filled and signed before taking over the OGB from the contractor 31
- 32. OG Board Commissioning theOGB, Project Officer shall 1. Voltage check using tong tester 230V ± 6% Phase to Neutral 400V ± 6% Phase to Phase 32 Phase to Neutral (216.2V-243.8) Phase to Phase (376V-424V) 241V 418V
- 33. OG Board Commissioning theOGB, Project Officer shall 2. Ensure that the phase sequence of LV cable is correct; and 3. Ensure OGB doors are closed and locked properly before leaving 33
- 34. Excavation Safety forpublic (Standard 3 signs) 34
- 35. Diversion There are 2types 1. 600/1000 Volts, 300mm² 4-core straight-Through Joint Intended for XLPE cables 2. 600/1000 Volts, 300mm² 4-core Transition Joint for XLPE cable to PILC cable 35
- 36. Description Terms Description LT HT LT-Low Tension HT-HighTension XIPE PILC XLPE-Cross Linked Polyethylene PILC-Paper Insulated Lead Covered AL Cu AL-Aluminum Cu-Copper 36
- 37. Document All completedProject will be storage in a room located on ground floor. 37
- 38. Recommend Improvement Wideningthe space of the Low Voltage Board termination point Using a insulated Busbar for safety Termination pointBusbar
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Editor's Notes
- #6 Before i talk about LV and OG Box, i will talk about Safety. Safety is the company priority.
- #10 Cu stand for Customer.
- #12 What is a floor mat used for? From safety. It keep the insulation
- #13 The busbar at the Neutral will be connected to the main earth located at baseman substation.
- #15 Earth fault indictor is a device which are tripped when there is a short circuit.
- #17 Auxiliary supply are distributed to DB, lighting etc
- #18 Incoming supply comes from the transformer
- #19 All earthing cable will be terminated at the earthing point. It is to ensure powered equipment, exposed metal parts are connected to ground to prevent user contact with dangerous voltage if electrical insulation fail.
- #21 Auxiliary supply is used to give supply to the substation. Example lighting, Switchboard etc.
- #22 Auxiliary supply is used to give supply to the substation. Example lighting, Switchboard etc.
- #24 The auxiliary is used to give out supply to the substation. Example lighting, DB etc
- #25 What’s the different between them? The physical look is different one is bigger than the other but both function the same. The centre has a locked. Why it has a locked? Well because it located is at a area where there has less people. Example like highway.
- #27 Because of the small cable size, the fuse needed to used is 100A. Red indicate Line and Black to indicate Neutral. Number 3 is the incoming. It is using 300mm² 3 phase. It is connected to a substation. The whole busbar are linked. It is to give out the supply. Number 4 is connected to another OG Board. It is using 300mm² 3 phase.
- #28 The project official need to get a key for the substation he/she is heading. Before heading to the OG Board, the Project Official has to get a key. This key is used to unlock the OG Board. The box that contains all those keys has an alarm. The Project Official will be given 24hours before returning the key back.
- #29 Each OGB unit is connected to a customer or OGB . The housing address can be found at the labelled section. Sitting of OG board should be at conspicuous location and not causing obstruction to pedestrians or vehicles. As near as practicable to the customer’s supply intake point/switchboard. Red indicates L1, Yellow indicates L2 and Blue indicates L3.For the cable size of 35mm² /3 phase uses 100A. Neutral busbar is connected to the substation transformer (Star). Neutral and earth are common. Each has User
- #30 Because of the small cable size, the fuse needed to used is 100A. Red indicate Line and Black to indicate Neutral. Number 3 is the incoming. It is using 300mm² 3 phase. It is connected to a substation. The whole busbar are linked. It is to give out the supply. Number 4 is connected to another OG Board. It is using 300mm² 3 phase.
- #33 What is upper jaw? Upper jaw is connecting to the busbar. Each busbar has a supply. Red, yellow, Blue and Neutral/ Earth. All the busbar are connected to the main incoming of the OG Board. The cable that is the biggest is the incoming. Let say there are 2 300mm² cable. How to know which is which. By using a Clamp on tester.The one that has the higher voltage is where the supply is coming from. The other could be connecting to another OG Board. The Lower jaw is the outgoing. Going out to customers.
- #34 Using a lamp tester, the project officer have to check the phase sequence whether it is correct or not. Busbar and cable end.
- #35 Before reaching the excavation work, there will be 3 signs. First sign is Caution to warn people that there is a excavation work. Works Ahead is the second sign. Third sign is to indicate which road is being used for excavation. The bottom left shows a expected completion when the excavation is done. It is to notify the resident.
- #36 Straight jointing is for diversion. Intermediate is for length.
- #38 This is where they keep all the completed project. Located at the ground floor.