METHOD STATEMENT OF TRANSFORMER – SW GEAR NỘI DUNG TABLE OF CONTENTS 51 AIM MỤC TIÊU 52 SCOPE OF WORKS PHẠM VI CÔNG VIỆC 53 REFERENCES THAM KHẢO 54 QUALITY CONTROL QUẢN LÝ CHẤT LƯỢNG 54 1 Purpose Scope Mục đích Phạm vi 54 2 Definition Định nghĩa 64 3 Process Flow Chart for the Work Plan Procedure Sơ đồ cho quy trình thực hiện công việc 74 4 Procedure Quy trình 74 5 Material Control Quản lý Vật tư 74 5 1 Purpose Mục đích 74 5 2 Scope Phạm vi 84 5 3 Responsibility Trách nhiệm 84.
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METHOD STATEMENT
OF
TRANSFORMER – SW GEAR.
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NỘI DUNG / TABLE OF CONTENTS
1 AIM / MỤC TIÊU 5
2. SCOPE OF WORKS / PHẠM VI CÔNG VIỆC 5
3 REFERENCES/ THAM KHẢO 5
4 QUALITY CONTROL/ QUẢN LÝ CHẤT LƯỢNG 5
4.1 PURPOSE/ SCOPE/ MỤC ĐÍCH/ PHẠM VI: 5
4.2 DEFINITION/ ĐỊNH NGHĨA 5
4.3 PROCESS FLOW CHART FOR THE WORK PLAN PROCEDURE/ SƠ ĐỒ CHO QUY TRÌNH THỰC HIỆN CÔNG VIỆC : 6
4.4 PROCEDURE/ QUY TRÌNH 7
4.5. MATERIAL CONTROL/ QUẢN LÝ V ẬT TƯ 7
4.5.1 Purpose/ Mục đích 7
4.5.2 Scope/ Phạm vi 7
4.5.3 Responsibility/ Trách nhiệm 8
4.5.4 GENERAL/ TỔNG QUAN 8
4.5.5 RECEIVING/ TIẾP NHẬN 9
4.5.6 STORAGE/ LƯU KHO 9
4.5.7 MARKING/ ĐÁNH DẤU 10
4.5.8 METHODS/ PHƯƠNG PHÁP 10
5 MATERIAL/ VẬT TƯ 10
6 PREPARATION/ CHUẨN BỊ 10
6.1 MACHINERIES & TOOL/ MÁY MÓC THIẾT BỊ & DỤNG CỤ: 10
6.2 SCAFFOLDING & LADDER/ GIÀN GIÁO & THANG : 11
6.3. RECEIVING, HANDLING AND STORAGE / TIẾP NHẬN , BỐC DỠ VÀ LỮU TRỮ 11
6.3.1 Receiving / Tiếp nhận: 11
6.3.2. Handling / Bốc dỡ 12
6.3.3 Moisture protection during storage / Bảo quản trong khi lưu trữ 12
7 INSTALLATION WORK/ CÔNG VIỆC LẮP ĐẶT 13
7.1 GENERAL / TỔNG QUÁT 13
7.1.1 Checking elements / Kiểm tra các cấu kiện 13
7.1.2 Correct installation sequence / Quy trình lắp đặt đúng 13
7.1.3 Joining elements Lắp ráp các cấu kiện 13
7.1.4 Checking the assembled elements Kiểm tra các kết cấu đã lắp ráp 13
7.1.5 Closing the junctions / Đậy các điểm đấu nối 13
7.2 INSTALLING A BUSBAR RUN / LẮP ĐẶT MÔ HÌNH THANH DẪN ĐIỆN 13
7.3 INSTALLATION RECOMMENDATION./ KHUYẾN CÁO LẮP ĐẶT 14
7.4 ATTACHING FIXING MATERIAL./ GẮN CÁC LINH KIỆN GHÉP NỐI 14
7.4 1 Overview / Tổng quan 14
7.4.2 Bracket for horizontal installation./ Giá treo cho kiểu lắp ngang 15
7.4.3 Spring brackets for vertical installation on walls./ Giá đỡ gắn tường kiểu đứng 19
7.4.4 Mounting the busbar trunking system on a bracket for vertical installation./ Gắn hệ thống thanh dẫn điện trên 1 giá đỡ kiểu đứng 20
7.4.5 Floor fixing for spring brackets./ Giá đỡ gắn sàn kiểu đứng 21
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7.4.6 Fixing brackets with fixed point for vertical installation./ Các mối ghép cố định thẵng đứng 22
7.5. JOINING ELEMENTS LẮP RÁP CÁC CẤU KIỆN 24
7.5.1 Connecting elements by joining the ends together using the joining tool./ Lắp ráp các kết cấu bằng cách ghép nối các phần cuối thanh dẫn điện với nhau 24
7.5.2. Joining from above, below or the side, without joining tool./ ắp ráp từ phía trên, phía dưới hoặc phía hông, không dùng dụng cụ ghép 27
7.6. EXPANSION UNIT./ BỘ PHẬN GIÃN NỞ 29
7.7. FLANGED END./ ĐẦU NỐI 30
7.7.1. General./ Tổng quan 30
7.7.2 Installation./ Lắp đặt 30
7.7.3 Handling if multiple busbar runs are laid in parallel./ Xử lý khi đấu nối song song nhiều thanh dẫn điện 32
7.8. TRANSFORMER CONNECTION./ ĐẤU NỐI VỚI MÁY BIẾN ÁP 33
7.8.1 Transformer terminal connection element./ Kết cấu đấu nối với tram biến áp 33
7.8.2 Positioning the transformer terminal connection element above the transformer./ Định vị kết cấu đấu nối với trạm biến áp phía trên máy biến áp 33
7.8.3 Attaching the transformer terminal connection element at the installation location./ Chằng buộc kết cấu đấu nối trạm biến áp tại địa điểm lắp đặt 33
7.9. TAP OFF UNIT./ HỘP ĐẤU NỐI ĐIỆN 34
7.9.1 Tap off unit from 50A to 630A./ Các phụ tải từ 50A-630A 34
7.9.2 Tap off unit from 800A to 1250A./ Các phụ tải từ 800A đến 1250A 35
7.9.3. Lateral mounting of tap off units above 400A in horizontal layout./ Nối các phụ tải trên 400A theo mặt hông trên sơ đồ lắp ngang 36
8. INSPECTION FOR INSTALLATION WORKS / KIỂM TRA CÁC CÔNG VIỆC LẮP ĐẶT 37
9. TESTING AND COMMISSIONING / THỬ NGHIỆM VÀ VẬN HÀNH THỬ NGHIỆM 37
9.1 VISUAL AND MECHANICAL INSPECTION / KIỂM TRA TRỰC QUAN VÀ LIÊN KẾT CƠ KHÍ 37
9.2 ELECTRICAL TESTS / CÁC THỬ NGHIỆM ĐIỆN 37
10 SAFETY METHOD/ PHƯƠNG PHÁP AN TOÀN 38
10.1 GENERAL/ TỔNG QUAN 38
10.2 WORKING AT ELEVATED AREA/ LÀM VIỆC Ở KHU VỰC CAO: 39
10.3 WORKING WITH ELECTRICAL EQUIPMENTS/ LÀM VIỆC VỚI CÁC THIẾT BỊ ĐIỆN 39
11 COMPLETION STATUS / TÌNH TRẠNG HOÀN THÀNH 39
- Base on Construction drawings issued by Client & Consultant The Contractor shall provide the shop drawing with detail of Installation method for every item of works
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- The Method Statement describes the necessary procedure to follow in order to ensure thatthe installation works are executed safely and in accordance with the Contract requirements, andthat all quality assurance/control activities are conducted in a systematic manner, withinspections and conformance verified and documented
WORKS SPECIFICATIONS
The following standards are applicable to this method statement and Tender Clarifications
- Plumbing, Drainage & Sanitary ware System MEP Specification: Division 22
- HVAC System MEP Specification: Division 23
- Low Voltage(LV) Electrical System MEP Specification: Division 26
- Extra Low Voltage(ELV) Electrical System MEP Specification: Division 27,28
RISK ASSESSMENT / JOB HAZARD ANALYSIS (JHA)
For the Risk Assessment please refer to the approved Environmental Management Plan(Table 1):
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Safety Install anchor bolt Drills concrete,
Brick wall
Dust that produce during drilling work might spread out and effect vision while
at work
High
Make sure that all personal protection equipment (PPE) be provided on site before starting
of work such as helmet, safety glasses, glove, etc
HSE Staff
Safety Install Support& Cable
Ladder – Tray - Trunking
Working at heights exceeding
3 meter
workers may fall down High
Scaffold that use at site have to
be inspected by safety supervisorbefore use Defective scaffolds will not be allowed to use for works
HSE Staff
Safety Pulling cable
Working at heights exceeding
3 meter
workers may fall down High
Scaffold that use at site have to
be inspected by safety supervisorbefore use Defective scaffolds will not be allowed to use for works
HSE Staff
Safety Pulling cable Heavy and long
Make sure that all personal protection equipment (PPE) be provided on site before starting
of work such as helmet, safety glasses, glove, etc
HSE Staff
Safety Install conduit working at
heights exceeding
3 meters
workers may fall down High Make sure that all personal
protection equipment (PPE) be provided on site before starting
HSE Staff
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Side
Assess the Situation Solution
Control person
of work such as helmet, safety glasses, glove, etc
Safety Install Panel Board drills concrete,
of work such as helmet, safety glasses, glove, etc
(Safety Manager)
Make sure that enough condition
be provided on site before starting of work such as lighting, protection equipment (PPE)
HSE Staff
Dust and
Mud
Dust generation from
loading and unloading/
transport of materials
Materials storage works
Reduction of local air quality, malodours and visual impairment
High
Cover the vehicle by tarpaulins, sprinkle water, enforce speed limit rules
HSE Staff
Noise Install work
Chipping, cutting,drills concrete, brick
Poor public industrial relations Complaints from legal authority
High Use cover wall, mufflers or
silencers to reduce noise HSE Staff
Noise Loading and unloading
of lorries
Material transportation
Poor public industrial relations Complaints from legal authority
High Arrange deliveries to suit the
area Minimize the drop height
(Safety Manager)
Water
pollution
Disposing of washout
from relate work
concrete around the site
Chipping, cutting,drills concrete, brick
Destruction of
sewerage works
High
Restrict use water in chipping,
cutting concrete, brick, tools cleaning within the site and
designate the area for the same
HSE Staff
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Side
Assess the Situation Solution
Control person
into area recyclable
HSE Staff
Air
pollution
Dust from cutting,
grinding, grouting and
packing
Chipping, cutting,drills concrete
Reduction of local air quality, malodours and visual impairment
Air
pollution
Poor handling and
storage of materials such
as stockpiling sand
Material storage
works
Reduction of local air
quality, malodours and visual impairment
High Cover all dust generating
materials, sprinkle water HSE Staff
Cross contamination of land, air, ground and surface waters
High
Clean work area, move material and moved recyclable and waste packing materials into area recyblable
HSE Staff
Land
pollutio Install conduit
Chipping, cutting, drills concrete, brick
Cross contamination of land, air, ground and
surface waters
Medium
Cleaned area work, move material and moved recyclable
into area recyclable
into area recyclable
HSE Staff
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- Risk assessment shall be carried out to ensure that potential hazards can be identified andsubsequently safety control measures are implemented to eliminate or to reduce the hazardsidentified:
- STEP 1: Break down the construction activities into various stages of work This taskshall be carried out as part of the pre-planning phase of work
- STEP 2: Identify the potential hazards associated with each phase of work and evaluateits risk occurrence based on the risk matrix
- STEP 3: Safety control measures shall be implemented to eliminate or reduce the risksidentified All reasonably practicable measures must be taken to eliminate any foreseeable risk toany person If the risk cannot be eliminated, safety measures must be taken to minimize the risk.Some measures to minimize the risks are listed in the figure below They are listed in decreasingorder of preference, i.e from most preferred to least preferred
Figure 1 Safety Hierarchy of Control
INSPECTION & TESTING PLAN (ITP)
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GENERAL
- All required testing and inspection will be detailed in the Inspection and Testing PlanTable as follow The ITP will also detail all acceptance criteria plus approving body at each stage
of inspection and test being carried out
- Beyond the external inspection to be carried out with the Engineer, an ad-hoc internalinspection system will be adhered to ensure minimum reworks and minimize conditions of workrejections
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Electrical Inspection and Test Plan Matrix (General)
Division Description
Factory Witness Testing/Inspecti on
Equipment/
Material Delivery Inspection
Installation Inspection
Commissionin
g Test / Operating &
Performance Tests
Endurance
Inspection
Test On Completion
All Control Document
Factory Witness Testing/Inspectio
n Procedure
Materilas &
Equipment approved
Method of Statement forInstallation
Method of Statement for Testing &
Commissioning
Method of Statement for Endurance Test
Test On Completion Procedure
Factory Witness Testing/Inspectio
n Checklist
Equipment/
Material Delivery Inspection Checklist
Field Inspection Checklist
Testing and CommissioningTest Report
Endurance Test Report
Tests On Completion Report
All Frequency *Refer to Testingand Training
Requirement
Once per Delivery
As per Works Program
Once per Area/
Floor/ Building
or System
Once per Completed System
Once per Completed System
Medium voltage cable
Low voltage cable
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Material Delivery Inspection
Installation Inspection
Commissionin
g Test / Operating &
Performance Tests
Endurance Testing / Inspection
Test On Completion
Grounding / Lightning Protection
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Equipment, Shop Drawing
Prepare Document by Engineers
Submit to Consultant
QC Check
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2.B.11.1 INSTALLATION MAINFEEDER WORKS (CABLE LADDER - TRAY –
TRUNKING, CABLE RACK)
2.B.11.1.1 General Description
- This Method Statement only covers works relating to areas having cables supported onCable Ladders, Cable Trays& Trunking Works will be carried out based on constructionschedule and approved Shop Drawings The objective is to Safety and correctly installs inaccordance with the approved Safety Plan and the Specification requirements The CableLadder, Cable Tray and Trunking will be installed to their designated location as shown on theapproved Shop Drawings The works shall be coordinated with other construction activities onthe Site, as necessary and in accordance with the Plans, Drawings, Specification and allrelevant Standards Upon completion of the Works, the site will be cleaned as necessary toensure the smooth execution of other construction activities
- All of Indoor Cable Ladder, Cable Tray and Trunking in this project are PowederCoated type (except Warehouse)
- All of Outdoor Cable Ladder, Cable Tray and Trunking in this project are Hot deptgalvanized type (included Warehouse)
2.B.11.1.2 Site Planning & Preparation
The following activities will be conducted before starting the works:
- Scaffolds and “A” Ladder that are to be used on site will be inspected and deem safe bythe Contractor's Safety Supervisor before use Defective scaffolds will not be allowed to usefor the works Tagging will be provided by the contractors Guard rails will be provided whenworking at height exceeding 3 meters
- ‘A’ ladders when used against a wall shall not form an angle greater than 30 fromvertical All ‘A’ ladder when in used must be fully extended with the safety catch engaged
- Workers will be briefed on how to properly handle and pull cable following the correctsequencing of work execution
- The workers will be briefed about Safety manner
- After Cable support system is erected, it will be cleaned, inspected & approved beforestarting the works
- Confirm Anchor bolt / Insert layout is ready for installation
- Prepare the threaded rods (hot dipped galvanized) and cut to necessary length withspeed cutter Remove all sharp edges after cutting
- The workers at both side of Cable Duct, Cable Ladders, Tray & Trunking will becoordinated as necessary
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- When Cable Ladder, Cable Tray & Trunking are to be cut, the ends will be checked andrepainted by same materials for painting
2.B.11.1.3 Work Methodology
2.B.11.1.3.1 Installation of cable tray/ trunking hang from concrete slab
Typical detail of installation of cable tray/ ladder on ceiling
- The installation of Anchor bolt/ Insert will be as per approved Shop Drawing
- Confirming Anchor bolt & Insert layout in position
- Cut the required length of galvanized threaded rod support, sharp edges of the rod will
be cleaned before installation
- Double nuts and washer will be install according to approved Method Statement
- Check the actual installation after installed the hanger / support
- Actual length of galvanized threaded rod for installation will be determined
- Ensure that the double nuts and washer properly tightened
- Ensure the both ends of the unistrut are cleaned and no sharp edges
- Install bracket support for cable tray/ ladder
- Install cable tray/ ladder on support
- Connect earth-link at expansion joint on cable tray/ ladder
2.B.11.1.3.2 Installation of cable tray/ trunking hang from roof purlin
- Provide the lifter (or scaffold for available area)
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- Marking exactly the locations for fixing clamp as indicated in approved shop drawing
- Drill holes and install U-clamp, max distance beween clamps is 1.200mm
- Cut the required length of galvanized threaded rod support, sharp edges of the rod will
be cleaned before installation
- Double nuts and washer will be install according to approved Method Statement
- Check the actual installation after installed the hanger / support
- Actual length of galvanized threaded rod for installation will be determined
- Ensure that the double nuts and washer properly tightened
- Ensure the both ends of the unistrut are cleaned and no sharp edges
- Install bracket support for cable tray/ ladder
- Install cable tray/ ladder on support
- Connect earth-link at expansion joint on cable tray/ ladder
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2.B.11.1.3.3 Installation of cable ladder on the wall and riser
Installation of cable tray/ ladder on the wall and riser
- Setting layout for Anchor bolt as per approved Shop Drawing
- Marking the concrete/brick wall before drilling as per approved Shop Drawing
- Blow out dust and fragments from the holes after drilled
- Used appropriate tools like hammer and setting tool for installing Anchor bolt orExpansion bolt
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- Angular support will be installed after drilled the holes for Anchor bolt
- Installation of Cable Ladder/Tray will be follow
- Install cable tray/ ladder on support
- Connect earth-link at expansion joint on cable tray/ ladder
2.B.11.1.3.4 Installation of cable ladder to DB panel
- Setting layout for Anchor bolt as per approved Shop Drawing
- Marking the concrete/brick wall before drilling as per approved Shop Drawing
- Blow out dust and fragments from the holes after drilled
- Used appropriate tools like hammer and setting tool for installing Anchor bolt orExpansion bolt
- Angular support will be installed after drilled the holes for Anchor bolt
- Installation of Cable Ladder/Tray will be follow
- Install cable tray/ ladder on support
- Connect earth-link at expansion joint on cable tray/ ladder
- Installation of cover after finishing cable works
- Seal up the gap between opening of DB panel and ladder
2.B.11.2 INSTALLATION PANEL WORKS
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2.B.11.2.1 General Description
- This method statement covers works relating to areas having panel boards installed onconcrete walls, brick walls, dry walls and floor slab Works are carried out basing onconstruction schedule and detailed shop drawings The works will be carried out in a safemanner in accordance with the approved safety plan and the Specification requirements Thepanel board on wall will be installed to their designated location as shown on the approvedshop drawings The works will be coordinated with other construction activities on the site, asnecessary and in accordance with the approved Shop Drawings, Specification and all relevantstandards Upon completion of the work, the site will be cleaned as necessary to ensure thesmooth execution of other construction activities
2.B.11.2.2 Site Planning & Preparation
The following activities will be conducted before starting the works:
- Scaffolds that are to be used on site will be inspected for safety by the Contractor'sSafety Supervisor, before use Defective scaffolds will not be allowed to be used for the works.Tagging will be provided by the respective contractors Guardrails will be provided whenworking at heights exceeding 3 meters
- Workers will be briefed on how to properly handle and install Panel board followingthe correct sequence of work execution
- The workers will be briefed about safety matters
- Location panel board will be checked, following the approved shop drawings at theareas where the panel board are ready to be installed
- The actual size and type of panel board required for installation shall be determined
- The starting point for the panel board installation will be checked and inspected based
on the approved shop drawings
- The workers will be coordinated as necessary
- If the opening of the panel board has sharp edge, the opening will be treated so as to notdamage the cables
- After panel board is installed, it will be cleaned and inspected
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- The actual panel boards needed for installation shall be determined
- The cable routing will be checked to be clear from any obstruction
- The manpower for the activities with complete electrical hand & tool will be mobilized
- The safety officer-in-charge will check the area to ensure no potential dangers arepresent and everything is safe for the installation
- The Panel boards shall be completely enclosed, self supporting vertical structuresbolted together to form a rigid single sheet metal enclosure Boards shall be provided withfront and rear channels The end, top and rear shall be covered with removable screw-on-steelplates of approved thickness Panel boards shall include all protective devices and equipment
as necessary for interconnection, instrumentation and controls and terminal blocks withmechanical type solderless connectors for terminals
- Panel boards shall be factory bake finished, all as the approved Metal surfaces shall bechemically cleaned and treated Chemical treatment shall provide a bond between paint andmetal surfaces and help prevent entrance of moisture and formation of rust under the paintfilm Protection Index, color and other construction details will be as generally approved
- Panel boards shall be locked and accessible only to authorized staff
- The panel boards will be designed, installed and maintained in such way to be free ofmoisture and humidity
- Panel boards shall be completely assembled with all switchgear and wired at thefactory Thorough inspection shall be made before and after assembly to ensure correctness ofdesign and workmanship
- All cable entries shall be with cable glands or any other system fully reviewed andapproved by the Engineer, to provide secure fixings without stress on cable cores and preventthe intrusion of objects or rodents
- Busbar structure shall be arranged to permit future extension It shall be mounted oninsulator supports or high impact, non-tracking high quality insulation material and adequatelybraced to withstand the mechanical forces exerted during asymmetrical short circuit Bus barsshall be silver plated copper Branch circuit bushing shall connect directly to the bus structure.All bus work shall consist of sufficient copper to limit temperature up to 40°C ambienttemperature
- All ironmongery and other hardware shall have suitable protective finish as approved
- Anchor bolts, anti vibration bases and vibration isolators, all foundation pads, supports,hangers, fixtures and fixings materials shall be provided as necessary
- Engraved metal nameplates shall be provided for each device The letters or numerals
on the nameplate shall be a minimum of 5 mm in height, with light colored, enameledcharacters on a dark background The legend on the strips shall be composed as to clearly
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indicate the name of the feeder and/or panel board and/or equipment served by the protectivedevices, etc All elements and functions will be clearly labeled to ease Operation andMaintenance and avoid any risk of confusion or misunderstanding
- Ventilating louvers shall be provided on the doors, removable panel boards and otherlocations where required, -to allow natural circulation of air and to prevent undue temperaturerise Louvers shall be fitted with screens to prevent entry of insects and vermin
- Cable terminal mounting bolts and cable clamps to appropriate cable size shall beprovided
- Panel boards, circuit breakers and disconnecting switches shall be mounted as indicated
on the Drawings or so that the height of the operating handle at its highest position will notexceed 1.8 m from the floor
- Panel boards shall be connected to earthing system for protection
2.B.11.2.3.2 Installation of MV Switchgear, MSB panel and floor standing LV panels
Tools and materials such as panel board, anchor, hammer, markers, electric drill, trolley, meter,hand tools, etc, will be prepared before starting the works
Making Position
- Marking of position for MV Switchgear, MSB and floor standing LV panels on floor
- Check floor level of MV Switchgear, MSB and floor standing LV panels room, checkthe door height & wide
- Remove any remaining packing of MV Switchgear, MSB and floor standing LV panels Handling/Loading of MV Switchgear, MSB and floor standing LV panels
- Upon arrival, park the Lorry Crane at the designated parking location
- Barricade the Lorry Crane surrounding area including the MV Switchgear, MSB andfloor standing LV panels storage location
- Position the Lorry Crane, set-up outrigger and Boom Lift and hook-up the slings withshackle to lifting ring on the MV Switchgear, MSB and floor standing LV panels Thequalified rigger shall check all the lifting point to ensure that all the lifting points are properlyhook and tightened
- Tag lines are to be tie on the lifting point of MV Switchgear, MSB and floor standing
LV panels hook to prevent the MV Switchgear, MSB and floor standing LV panels fromswaying
Moving the enclosure panel of MV Switchgear, MSB and floor standing LV panels
- Using hand-lift to move the MV Switchgear, MSB and floor standing LV panels to thelocation
- The steel plate to maintain at above the kerb of the door