High-load capacity, 24/7 protection – Three-Phase Pad-Mounted Transformer, designed for modern power needs!
01 General
1.1 Project Description
This 2500 kVA Pad mounted transformer was delivered to Canada in 2024. The rated power of the transformer is 2500 kVA, with the primary voltage 13.2GrdY/7.62 kV to secondary voltage 0.48GrdY/0.277 kV. The connection group is YNyn0,pad mounted transformer is to optimize the combination of oil-immersed sealed power transformer and high and low voltage electrical components, through the optimization of the structure, the switchgear is miniaturized as far as possible, greatly reducing the footprint of the combined transformer, its volume is only equivalent to the same capacity of European box change 1/3~1/5, It has the advantages of small volume, low noise, reliable power supply, reasonable structure, flexible installation, easy operation, and maximum penetration into the load center. Widely used in residential areas, commercial centers, stations, industrial and mining enterprises, airports, railways, schools, hospitals, high-rise buildings and other places. The American transformer adopts double fuse protection, and the plug-in fuse (BAY-O-NET) is the short-circuit fault occurring on the secondary side of the double sensitive fuse (temperature, current) protection box. Backup current limiting protection fuse (ELSP) protection box changes internal faults, used to protect the high voltage side.
1.2 Technical Specification
2500 kVA transformer specifications type and data sheet
| Delivered to | Canada |
| Year | 2024 |
| Type | Pad mounted transformer |
| Standard | IEEE C57.12.00 |
| Rated Power | 2500KVA |
| Frequency | 60HZ |
| Phase | 3 |
| Feed | Loop |
| Front | Dead |
| Cooling Type | ONAN |
| Primary Voltage | 13.2GrdY/7.62 KV |
| Secondary Voltage | 0.48/0.277 KV |
| Winding Material | Aluminum |
| Angular displacement | YNyn0 |
| Impedance | 5.75±7.5% |
| Efficiency | 99.53% |
| Tap Changer | NLTC |
| Liquid insulant | Mineral oil |
| Tapping Range | ±2*2.5% |
| No Load Loss | ≤2.3KW |
| On Load Loss | ≤16.2KW |
| Accessories | Standard Configuration |
1.3 Drawings
2500 kVA pad mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The three-phase five-column laminated iron core can effectively reduce iron loss and noise, and the three-phase five-column structure can provide a more uniform magnetic flux distribution, enhance the bearing capacity of the iron core to the magnetic field, and help improve the working efficiency and performance of the equipment. The laminated structure helps to improve the heat dissipation performance of the core, reduce temperature rise, prevent overheating, and extend the service life of the equipment. |  |
2.2 Winding
 | High voltage ZGS series high voltage terminals are equipped with high voltage bushing single or double) used to connect elbow type cable plug or elbow type fully insulated arrester, the live part is sealed in the insulation body, forming a fully insulated structure, the terminal surface is not charged, (ground potential), to ensure personal safety. In case of emergency, the cable plug can be plugged in and out when the transformer is fully loaded. For this reason, the cable plug can also act as a load switch. Live display or fault indicator can be installed on cable plug as required. A wall mount is welded on the front bulkhead of the transformer high pressure tank near the high pressure bushing, which is used to fix the configurable support type insulating bushing head. When the cable plug is on, it can be immediately inserted into the support type bushing joint. Low voltage There are low-voltage outlet terminals in the low-voltage interval, and the low-voltage main circuit breaker and branch circuit breaker, low-voltage current, voltage meter and automatic reactive power compensation device are provided as required. The axial fan can be installed on the top of the low-voltage interval according to user requirements, and the special temperature control equipment can automatically control the heat dissipation of the fan according to the temperature in the interval. Can be installed with telemetry if required. The integrated distribution tester with remote communication function, supplemented by the low-voltage and under-voltage controller, can realize the protection function of no-voltage and single-phase under-voltage, which can avoid damage to transformers and load electrical appliances. |
2.3 Tank
| According to the design drawings, the steel plates are cut into different sizes and shapes for subsequent assembly. Cutting methods can be CNC cutting machine, laser cutting or oxygen cutting. The cut steel plate is bent, crimped and other processes to form various components of the tank, such as bottom plate, side plate, top plate, etc. Argon arc welding or arc welding and other welding methods are used to connect the various components of the tank to ensure the robustness and tightness of the welding. After welding, it is necessary to carry out appearance inspection and size proofreading to ensure that the design requirements are met. After welding is completed, the surface of the tank is treated to prevent corrosion and rust. Common methods include sandblasting, sanding and degreasing, followed by coating with anti-corrosion paint or paint. The box adopts anti-corrosion design and special spray painting treatment, which can be applied to a variety of harsh environments, such as many storms and high pollution areas. |  |
2.4 Final Assembly
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | % | Maximum resistance unbalance rate≤5% | 3.28 | Pass |
| 2 | Ratio Tests | % | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: YNyn0 | -0.02% ~ -0.01% | Pass |
| 3 | phase-relation tests | / | YNyn0 | YNyn0 | Pass |
| 4 | No-load losses and excitation current | % kW | t: 20℃ I0: provide measured value P0: provide measured value the tolerance for no load loss is +10% | 0.25 2.354 | Pass |
| 5 | Load losses impedance voltage and efficiency | % kW kW | t: 85℃ Z%: measured value Pk: measured value Pt: measured value The tolerance for impedance is ±7.5% The tolerance for total load loss is +6% Efficiency not less than 99.53% | 5.85 15.580 17.934 99.53 | Pass |
| 6 | Applied Voltage Test | kV | HV&LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | kV | Applied voltage (KV): 26.4 Duration(s): 40 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass |
| 8 | Leakage Test | kPa | Applied pressure: 20kPA Duration: 12h | No leakage and no Damage | Pass |
| 9 | Insulation Resistance Measurement | GΩ | HV&LV to Ground: | 8.68 | / |
| 10 | Oil Dielectric Test | kV | ≥45 | 53.80 | Pass |
| 11 | Noise test | dB | 51-55 | 57.3 | Pass |
| 12 | Lightning impulse test | kV | full wave, Half wave | No collapse of the test voltage occurs | Pass |
04 Packing And Shipping
05 Site And Summary
In conclusion, the Three Phase Pad Mounted Transformer stands out for its high efficiency, safety, and durability, making it widely applicable in various commercial, industrial, and public infrastructure projects. Whether for high-load power distribution or stable operation in complex environments, this product delivers reliable solutions to support efficient energy management and long-term economic benefits. Choose the Three Phase Pad Mounted Transformer to empower your projects and contribute to a green and efficient energy future.
