This product is widely used in medium-voltage distribution systems for industrial parks and commercial centers, providing safe and reliable power conversion solutions. We offer customized services to meet specific technical requirements including special voltage ratios and protection levels.
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ZGSL-Z-3150/25-0.415
Our 25kV pad-mounted transformer (Model: ZGSL-Z-3150/25-0.415) is a heavy-duty, purpose-built power distribution solution engineered for reliable medium-to-low voltage conversion in demanding outdoor environments. With a 3150kVA rated capacity, 25kV primary voltage, and 415Y/240V secondary voltage, this 3150kVA pad-mounted transformer delivers consistent performance for large-scale power networks. Built with a fully sealed corrosion-resistant steel enclosure and IP55 protection rating, it is optimized for long-term operation in extreme weather, high-humidity, and high-pollution settings, supported by an efficient ONAN cooling system that limits full-load temperature rise to 65K.

Our low-loss pad-mounted transformer achieves a verified 99.16% full-load efficiency, with no-load loss ≤3.2kW and load loss ≤23.5kW—outperforming standard industry units by 30% to deliver significant long-term energy savings for high-demand operations.
Engineered to withstand harsh outdoor conditions, the unit resists weather ingress, vandalism, and wildlife interference, with a rugged build that supports a 30-40 year service life with proper maintenance. It has passed rigorous type tests including lightning impulse and short-circuit withstand tests.
Ground-level mounting simplifies installation, requiring only a concrete pad and standard electrical connections. The accessible design streamlines routine inspections, minimizing downtime and lowering long-term operational expenses.
The tamper-proof, lockable steel enclosure prevents unauthorized access, with built-in grounding and fault protection that meets strict safety requirements for high-traffic commercial and industrial sites.
| Type | Pad mounted transformer |
| Model | ZGSL-Z-3150/25-0.415 |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 3150KVA |
| Cooling Method | ONAN |
| Primary Voltage | 25kV |
| Secondary Voltage | 415Y/240V |
| Rated Frequence | 60HZ |
| Insulation oil | Mineral oil |
| Tapping Range | +2×2.5% |
| Temperature rise℃) | 65 |
| Connection Group | Dyn1 |
| Impendace% | 6 |
| Standard | IEEE C57.12.00 IEEE C57.12.90 |
| Dimensions(mm) | 1200*1000*2000 |
| Total weight(kg) | 7500 |
This outdoor pad-mounted distribution transformer is widely deployed across: underground power networks for residential subdivisions and commercial districts; localized power supply for industrial parks, data centers, and office buildings; renewable energy integration for solar and wind farms; critical infrastructure for hospitals, schools, and airports; and temporary power for construction sites and emergency restoration projects.
Our IEEE standard pad-mounted transformer is designed and manufactured in strict accordance with IEEE C57.12.00 and IEEE C57.12.90 standards. Every unit undergoes comprehensive factory testing, including dielectric strength, partial discharge, and temperature rise tests, before shipment, with a full-process quality management system from raw material sourcing to final assembly.
As a trusted transformer manufacturer with over 30 years of industry expertise, we support commercial and industrial operators, utility providers, and infrastructure developers with tailored power solutions. We offer a 99.5% on-time delivery rate, custom engineering for extreme climates, 2-year extended warranty options, short production cycles, and dedicated technical support from design to after-sales service.
Generic installation and use instructions for pad mounted transformer containing the following sections:
1. Shipment,handling, rigging & storage
2. Transformer installation: including crane lifting, rigging, Jack & skid, Foudation, Compartment, Grouding, High voltage and low voltage connections, dielectric fluid, transformer pressure, and other aspects
3.Pre-energization
4.Post-energization
5.Switching operation
6.Protection
7.Accessories
8.Maintance
9.Field acceptance test guidelines
10.Tables and procedures
