Installation Specifications and Construction Key Points of 100kVA Dry-Type Transformers
Feb 04, 2026
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As a professional manufacturer of power transformers with over 18 years of R&D, production, and global export experience, GNEE is committed to providing high-quality, standard-compliant 100kVA Dry-Type Transformers and professional installation services for global customers.
Our products comply with GB/T 1094, IEC 60076, and other international standards, and we have served thousands of industrial, commercial, and municipal power projects. Correct installation is the foundation for the safe, stable, and long-term operation of 100kVA Dry-Type Transformers.
This guide elaborates on pre-installation preparation, on-site installation specifications, commissioning acceptance, and core construction key points to ensure your project meets quality and safety requirements.
100kVA Dry-Type Transformers
Pre-Installation Preparation for 100kVA Dry-Type Transformers
Proper pre-installation preparation directly avoids construction risks and ensures the smooth progress of on-site work. It includes site selection, foundation construction, transportation, and unpacking inspection.
Site Selection & Foundation Requirements
The installation site of 100kVA Dry-Type Transformers must meet safety, ventilation, and environmental requirements.
For indoor distribution rooms, the ambient temperature should be between -5℃ and 40℃, and the relative humidity should not exceed 95% (without condensation).
The foundation must be made of reinforced concrete with a load-bearing capacity of at least 2.5 tons/m² to support the transformer's weight (about 350-450kg for standard models).
A 100-150mm high anti-slip base should be reserved on the foundation to fix the transformer, and a 1m wide maintenance channel should be left around the equipment for later operation and maintenance.
Transportation & Unpacking Inspection
100kVA Dry-Type Transformers are precision electrical equipment.
During transportation, use special hoisting tools and avoid violent collision or tilting.
After arriving at the site, conduct a full unpacking inspection: check for physical damage (cracks in the epoxy resin casting, bending of the winding), intactness of accessories (temperature sensor, tap switch, wiring terminals), and consistency of product models with the order.
Retain the original packaging and inspection records for future after-sales service.
On-Site Installation Specifications of 100kVA Dry-Type Transformers
On-site installation must follow standardized procedures to ensure the transformer's electrical and mechanical performance is not affected.
Hoisting & Positioning
Use a electric hoist or crane with a load capacity of more than 1 ton for hoisting.
The hoisting points must be the dedicated lifting lugs on the transformer body-never hoist by the winding or bushing to avoid damage.
Lower the transformer slowly to the reserved foundation, align it with the base bolts, and fix it with nuts and gaskets to ensure the equipment is stable and horizontal.
After positioning, adjust the levelness with a level gauge (deviation ≤ 1mm/m).
Wiring & Connection Construction
- High-Voltage Side Wiring: Use insulated copper wires with a cross-sectional area of ≥16mm². Connect the transformer's high-voltage terminals to the 10kV distribution network cables, and wrap the wiring parts with insulating tape to prevent short circuits. The tap switch should be set to the standard position (±0% tap) and locked with a screw to avoid loose contact.
- Low-Voltage Side Wiring: For the 0.4kV low-voltage side, use copper busbars or cables with a cross-sectional area of ≥50mm². Connect the three-phase four-wire system strictly in accordance with the wiring diagram, and mark the phase sequence (A/B/C/N/NE) clearly. Tighten all wiring terminals with a torque wrench to ensure good contact (torque value: 8-10N·m for standard terminals).
Grounding System Installation
The grounding of 100kVA Dry-Type Transformers is critical for personal and equipment safety.
The transformer's metal shell, base, and low-voltage neutral point must be reliably grounded.
Use a galvanized steel grounding wire with a cross-sectional area of ≥25mm², and connect it to the building's comprehensive grounding grid.
The grounding resistance should be ≤4Ω (indoor distribution room) or ≤1Ω (outdoor industrial environment).
Apply anti-rust paint to the grounding connection parts to prevent corrosion.
Commissioning & Acceptance of 100kVA Dry-Type Transformers
After installation is completed, commissioning and acceptance must be carried out to verify the transformer's operation status.
Pre-Commissioning Inspection
Check all wiring connections for looseness, the integrity of the temperature monitoring system (PT100 sensor), and the normal operation of the cooling fan (if equipped). Confirm that the grounding system is reliable and no foreign objects are left inside the transformer body.
No-Load Commissioning
Power on the transformer for no-load operation for 2-4 hours. Monitor the no-load current, temperature rise, and noise (≤55dB for standard models). If there is abnormal noise, over-temperature, or current fluctuation, stop the machine immediately for inspection.
Load Commissioning & Acceptance
After no-load commissioning is qualified, carry out load commissioning with 50%, 75%, and 100% of the rated load. Test the voltage stability, loss, and protection functions (over-temperature alarm, short-circuit protection). The transformer is considered qualified for acceptance only when all indicators meet the standards and the on-site acceptance report is signed.
Core Construction Key Points for 100kVA Dry-Type Transformers
To avoid hidden dangers during construction, the following key points must be strictly observed:
- Anti-static & Anti-dust: Keep the construction site clean to prevent dust from entering the transformer winding, which affects heat dissipation. Wear anti-static clothing and tools during wiring to avoid static discharge damage to the insulation.
- Standardized Wiring: Never reverse the phase sequence of high and low voltage sides, and ensure the tap switch is fixed firmly to avoid overheating caused by poor contact.
- Cooling System Maintenance: For AF (Forced Air Cooling) models, check the cooling fan's power supply and operation status before commissioning to ensure normal heat dissipation.
- Fire Protection: The installation site must be equipped with fire-fighting equipment (dry powder fire extinguisher) in accordance with fire protection codes, as 100kVA Dry-Type Transformers are non-flammable but require fire prevention for auxiliary equipment.
Standard Product Parameters Table of GNEE 100kVA Dry-Type Transformers
| Parameter Name | Standard Value |
|---|---|
| Rated Capacity | 100kVA |
| Rated Voltage (HV/LV) | 10kV / 0.4kV |
| Rated Frequency | 50Hz |
| Connection Group | Dyn11 |
| Insulation Grade | F Grade (155℃) |
| Cooling Mode | AN (Natural Air Cooling) |
| Protection Grade | IP20 |
| Winding Material | Copper |
| No-load Loss | ≤320W |
| Short-circuit Withstand Capacity | Comply with GB/T 1094.5 |
Post-Installation Maintenance Guidelines
To extend the service life of 100kVA Dry-Type Transformers, conduct regular maintenance: clean dust on the surface and cooling fins every 3 months, check the temperature sensor and wiring terminals every 6 months, and inspect the grounding system every year. For long-term unused transformers, conduct a pre-use insulation resistance test to ensure safe operation.
Conclusion
Correct installation and standardized construction are the core guarantees for the safe and efficient operation of 100kVA Dry-Type Transformers.
As a professional transformer manufacturer, GNEE provides not only high-quality products but also one-stop installation guidance, technical support, and after-sales service to meet the needs of global power projects.
Whether you are undertaking industrial, commercial, or municipal projects, follow the above specifications and key points to ensure the transformer operates stably. Contact GNEE's technical team to get professional installation solutions and a free consultation for your 100kVA Dry-Type Transformer project today!
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