EN
Before Delivery
Complete drawings, foundation, access, grounding and cable interfaces.
Your Installation Journey
Know what must be complete before moving to the next stage
The sequence below is the organizing logic for this page and for the work on site.
Receiving
Inspect packaging, equipment condition, accessories and nameplate.
Positioning
Use designated lifting points, level the unit and secure it correctly.
Site Interfaces
Complete drainage, conduits, working access and grounding.
Connections
Connect grounding, LV, HV, controls and protection in sequence.
Commissioning
Complete inspections, electrical tests and functional checks.
Handover
Energize progressively and transfer the operating record set.
01 · Before the Transformer Arrives
Complete every site interface before delivery
Use the approved outline drawing to coordinate the foundation, cable entries, grounding, drainage, operating access and lifting route.
Before delivery: confirm the civil, cable, grounding, drainage, lifting and operating-access interfaces against the approved transformer drawing.
Approved Layout
Confirm final footprint, equipment orientation, door opening and accessory positions.
Foundation
Provide a level, load-bearing foundation sized for the actual transformer.
Cable Interfaces
Coordinate trench, conduit location, sealing and cable bending space.
Grounding Grid
Provide accessible connection points based on the site grounding design.
Drainage & Containment
Prevent standing water and provide oil containment where applicable.
Delivery & Maintenance Access
Keep routes clear for transport, lifting, operation and future replacement.
02 · Receiving, Handling & Positioning
Protect the transformer from delivery through final placement
Inspect the shipment before unloading, use the designated handling points and confirm the unit is level, secure and undamaged after positioning.
Inspect on Arrival
- Packaging and impact indicators
- Dents, scratches and leakage
- Bushings, gauges and accessories
- Nameplate and shipping documents
Check Completeness
- Main unit and loose accessories
- Drawings, manuals and packing list
- Oil, radiators and fittings where shipped separately
- Report shortages before installation
Lift Correctly
- Use designated lifting and jacking points
- Use suitable spreaders and rated equipment
- Do not load bushings, radiators or pipework
- Keep the unit controlled during movement
Position & Secure
- Confirm orientation and cable approach
- Level and fasten the transformer
- Remove transport restraints as instructed
- Reinspect after final placement
Use the model-specific lifting and handling instructions.
Transformer mass, center of gravity, lifting points and accessory arrangement vary by model. Do not infer a lifting method from product appearance.
03 · Installation Focus by Transformer Type
Apply the same journey with the right product-specific priorities
Select the installed transformer type to see the site issues that require the most attention.
Pad-Mounted Transformer
Prepare a level concrete pad, underground cable entries, permanent grounding, drainage, lockable access and unobstructed operating space.
Foundation and conduitsOperating door clearanceGrounding and neutralDrainage and site security
YAWEI single-phase pad-mounted working-space guidance
Plan 10 ft at the front operating side, 8 ft on the left, and 3 ft at the rear and right; allow 5 ft on the right when metering is inside. Keep combustible structures 10 ft away and maintain 3 ft from non-combustible structures where permitted. These distances support door operation, maintenance access and fire separation; use the approved layout and local utility rules for the final arrangement.
04 · Grounding, Cabling & Connections
Complete connections in a controlled sequence
Grounding comes first. Before energization, the approved drawing, transformer nameplate and site system must agree.
Complete Grounding
Connect the tank and required neutral points to the site grounding system.
Route & Support Cables
Seal conduits and support cables without excessive force on terminals.
Connect LV
Complete low-voltage connections to the approved terminal arrangement.
Connect HV
Complete primary connections after grounding and LV work are checked.
Verify Neutral & Phase
Confirm neutral, phase relation, vector group and system grounding.
Confirm Settings
Check tap position, controls, alarms and protection wiring while de-energized.
Approved DrawingConnections and layout
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NameplateRatings and vector group
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Site SystemVoltage, frequency and grounding
05 · Ready for Energization
Complete five readiness checks before requesting permission to energize
Physical, mechanical, electrical, protection and document readiness must all be confirmed by the responsible site team.
✓ SITE READY
Physical Condition
- No transport damage or leakage
- Correct oil or liquid level
- Clear operating area
- Doors and labels complete
✓ MECHANICAL READY
Installed Condition
- Level and securely fastened
- Cooling and accessories complete
- Cables supported
- Transport restraints addressed
✓ ELECTRICAL READY
Electrical Tests
- Grounding complete
- Insulation and winding resistance
- Ratio, polarity and phase relation
- Tap position confirmed
✓ PROTECTION READY
Protection & Controls
- Alarm and trip circuits
- Temperature and pressure devices
- Oil-level and gas relay functions
- Control power and indications
✓ DOCUMENTS READY
Authorization
- Approved drawings
- Completed test sheets
- Closed punch list
- Signed energization permit
| Commissioning check | Typical activity | Purpose |
|---|---|---|
| Insulation and winding condition | Insulation resistance and winding resistance | Confirm insulation condition and conductor continuity |
| Ratio and connections | Turns ratio, polarity, phase relation and vector group | Confirm winding relationship and site connections |
| Protection and alarms | Gas, temperature, pressure, liquid-level and trip/alarm circuits | Confirm functional response and signal routing |
| Tap equipment | Position, indication and permitted operation | Confirm voltage setting and control function |
| Insulating liquid | Liquid level, breakdown voltage and analysis where required | Confirm the condition of the insulating medium |
YAWEI single-phase pad-mounted pre-service checks
Use the product manual for the pressure and liquid-level procedure. The manual specifies no more than 7 psig, a hold of at least 4 hours, and its liquid-level reference at 25°C.
YAWEI single-phase pad-mounted insulating liquid
The factory-filled mineral oil specification includes ASTM D-877 dielectric strength of at least 30 kV and PCB content below 2 ppm. Apply the acceptance procedure stated for the supplied unit.
06 · First Energization & Trial Operation
Energize progressively and establish the operating baseline
Proceed only after authorization, then observe the transformer at no load before applying load in controlled stages.
Final Authorization
Confirm responsibilities, switching plan and permission to energize.
No-Load Energization
Energize under the approved operating procedure without connected load.
Observe
Check voltage, current, sound, leakage, pressure, temperature and alarms.
Apply Load
Increase load progressively while monitoring voltage and thermal behavior.
Record Baseline
Record load, voltage, current, balance, temperature and protection status.
Handover
Close actions and transfer the equipment and records to the operating team.
Cold-start requirement for YAWEI single-phase pad-mounted transformersUse the prescribed cold-start procedure when ambient temperature is below −20°C. Do not energize outside the manual’s low-temperature procedure.
Approved Drawings
Final layout, terminal arrangement, wiring and accessory drawings.
Technical Datasheet
Approved ratings, impedance, vector group, taps and cooling.
Test Records
Applicable factory, FAT, site and commissioning reports.
O&M Manual
Product operating, inspection, maintenance and safety instructions.
Spare-parts Information
Parts referenced to nameplate kVA, voltage and serial number.
Acceptance Record
Closed punch list, energization approval and signed handover.
Installation and commissioning support
Prepare the site with the correct product documents
Share the transformer model, voltage, capacity, site layout and schedule so YAWEI can provide the appropriate manual, drawings and technical support.