From community power supply to small industrial applications, single-phase pad-mounted transformers bring electricity closer to life.
01 General
1.1 Project Description
This 50kVA single phase pad mounted transformer was delivered to Saudi Arabia in 2024. The rated power of the pad mounted transformer is 50 kVA, the primary voltage and secondary voltage of the transformer are 24.94GrdY/14.4-0.24/0.12 kV, high voltage is dual high voltage. An additional dual voltage switch than a common single-phase transformer. The single-phase pad mounted transformer adopts a clamshell design, which facilitates the connection of cables and electrical components. The cabinet also has a versatile design to meet the protection device and switch configuration.
1.2 Technical Specification
50 kva pad mounted transformer specification and data sheet
| Delivered to | Saudi Arabia |
| Year | 2024 |
| Type | Pad Mounted Transformer |
| Standard | IEEE C57.12.00 |
| Rated Power | 50KVA |
| Frequency | 60HZ |
| Phase | 1 |
| Cooling Type | ONAN |
| Primary Voltage | 12.4GrdY/7.2*24.94GrdY/14.4 KV |
| Secondary Voltage | 0.24/0.12 KV |
| Winding Material | Aluminum |
| Polarity | Subtractive |
| Impedance | 2% |
| Tolerance | ±7.5% |
| Efficiency | 99.11% |
| Tapping Range | ±2*2.5% |
| Liquid insulant | Mineral Oil |
| No Load Loss | 0.123KW |
| On Load Loss | 0.45KW |
| Accessories | Standard Configuration |
1.3 Drawings
50 kva pad mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The material used for winding core is ultra-thin cold-rolled silicon steel with high magnetic permeability. The thickness of the silicon steel sheet is 0.18 ~ 0.30 Taking small and medium-sized transformers as an example, the use of winding core has the following advantages: 1) Under the same conditions, the no-load loss of the winding core is reduced by 7% to 10% compared with the stacked core; No-load current can be reduced by 50% ~ 75%. 2) The winding core can be made of very thin high-permeability cold-rolled silicon steel sheets, which can produce transformers with lower losses. 3) The winding core has good processability, no shearing waste, and the utilization rate is almost 100%. It can also adopt mechanized operation, eliminating the stacking process, and the production efficiency is 5 to 10 times higher than that of the stacking core. 4) The coil core itself is a whole, does not need to be fixed by clamping support parts, and does not have a joint, so under the same conditions as the stacked core, the transformer noise can be reduced by 5~10dB. 5) The process coefficient of the winding core single-phase transformer is about 1.1; Three-phase below 1.15; For stacking iron cores, the process coefficient of small capacity is about 1.45, and the process coefficient of large capacity is about 1.15. Therefore, the coil core is particularly suitable for small and medium-sized transformers. |  |
2.2 Winding
 | The foil winding transformer has many advantages such as high mechanization degree, good safe operation performance, excellent filling coefficient of iron window, energy saving and material saving. The advantages of foil coil are: good mechanical strength, not easy to deform, can withstand short-circuit force; Good electrical strength, uniform impact gradient voltage distribution; Easy to wind. The foil transformer uses copper foil or aluminum foil with high conductivity as a conductive material, the thickness of copper foil or aluminum foil is about 0.1 ~ 2.5mm, and the wire foil plate is wrapped around a layer for one turn. The conductive foil is lined with insulating paper, the thickness is 0.05 ~ 0.12mm, and the diamond dispensing cable paper is generally used. Because there may be metal dust on the surface of the conductive foil board, and the insulating paper will also have small pinholes, high-strength insulating paper should be used as interlayer insulation. The head and tail of the conductive foil plate are welded with a conductive bar (also with cold pressing clamp) as the lead wire of the winding. |
2.3 Tank
| – Assembled from cold-rolled high-quality hot-dip galvanized sheet – Surface electrostatic spray treatment, 50 years do not remove paint – Laser CNC equipment cutting, punching, and bending, to ensure processing accuracy |  |
2.4 Final Assembly
 | The clamp is used to secure the core and winding, and the terminal is used to connect the input voltage to the output voltage. 1. Place the base of the single phase pad mounted transformer: Place the base of the single phase pad mounted transformer in an appropriate position and ensure that it is firm and stable. 2. Install the box transformer body: Install the box transformer body part on the base, fix and connect according to the design standard. 3. Connecting winding and core: According to the design requirements, the winding and core and other internal components are connected to the box transformer body. 4. Install other accessories: Install other accessories (such as pressure gauge, temperature meter, etc.) of the box transformer to the box transformer shell. 5. Wiring and debugging: electrical wiring and connection, as well as preliminary debugging and testing of the transformer, to confirm that the box transformer works normally. |
03 Testing
Routine test
1. Ratio on all connections and tap positions
2. Polarity test
3. No-load losses at 105% rated voltage corrected to 85℃
4. Exciting current at 105% rated voltage
5. Load losses and impedance at rated current corrected to 85℃
6. Applied voltage
7. Induced voltage
8. Transformer tank leak-detection test.
Type test
1. Resistance optional
2. Temperature rise optional
3. Impulse strength optional
4. Radio-influence voltage optional
5. Short-circuit optional
6. Transformer integrity optional
7. Audible sound optional
04 Packing and Shipping
05 Site And Summary
As a key component of power distribution systems, the 50 kva pad mounted transformer stands out with its efficiency, reliability, ease of installation, and eco-friendly features. Widely used in residential, commercial, and industrial applications, it not only meets the diverse demands of modern electricity usage but also enhances the operational efficiency of power systems with its high performance and long lifespan. Choosing a single-phase pad-mounted transformer ensures a stable, cost-effective, and sustainable solution for your power projects, driving your electrical infrastructure toward higher standards!
