High-efficiency stepping systems from 10kVA to 20,000kVA engineered to international standards.
In modern electrical systems, the demand for step-down transformers continues to surge due to the rapid expansion of megacities, industrial manufacturing clusters, and heavy commercial systems. Grid transmission networks transport electricity at ultra-high (UHV) and high voltages (HV) to minimize losses over vast distances. However, local distribution networks, urban infrastructure, industrial factories, and municipal facilities demand low-voltage inputs (ranging from 110V up to 480V for light commercial and 3.3kV to 10kV for heavy industrial machinery).
As standard-efficiency transformers struggle under high environmental stresses and varying loads, global operations require more robust, low-loss systems. Henan Pirooz Power Co., Ltd. serves as a pivotal engineering partner, designing next-generation step-down transformers that guarantee steady secondary voltage lines while minimizing both core and load losses. Our products act as the safe, silent linkage between incoming distribution mainlines and the critical equipment that powers daily economic activities.
Integrating research and development, design, and precision manufacturing for complete global power infrastructure solutions.
Henan Pirooz Power Co., Ltd. is a comprehensive electrical power equipment manufacturer integrating research and development, engineering design, production, sales, and after-sales service. The company specializes in customized solutions for power transformers and complete sets of transmission and distribution equipment, providing reliable and efficient electrical products for global energy infrastructure projects.
The company operates a modern manufacturing facility with a complete production system covering product design, precision machining, assembly, and full electrical testing. Equipped with advanced production lines and strict quality control procedures, Henan Pirooz Power Co., Ltd. ensures that all products meet international standards and customer-specific technical requirements, maintaining high performance, safety, and durability.
Its core product range includes 10kV–35kV oil-immersed power transformers (such as S11, S13, S14, and S20 series), dry-type transformers (including SCB10, SCB11, SCB13, and SCBH15 series), as well as on-load tap-changing transformers, rectifier transformers, and furnace transformers designed for specialized industrial applications. These products are widely used in power utilities and heavy industries requiring stable and efficient energy distribution.
In addition to transformers, the company also provides complete electrical system solutions, including high and low voltage switchgear, European-style compact substations, American-style pad-mounted substations, and underground distribution substations. These integrated solutions are widely applied in power grid construction, industrial manufacturing, mining, metallurgy, petrochemicals, transportation systems, and renewable energy projects.
With a growing international footprint, Henan Pirooz Power Co., Ltd. has exported its products to multiple countries and regions worldwide, building long-term partnerships across global energy markets. The company continues to expand its production capacity and technological capabilities to meet increasing international demand.
A look inside our vertically integrated manufacturing systems where high precision meets strict quality control.
Compare design parameters of our primary oil-immersed and dry-type transformer line-ups.
| Transformer Series | Cooling Type | Rated Capacity (kVA) | Primary Voltage (kV) | Secondary Voltage (V) | Core Material | Compliance Standards |
|---|---|---|---|---|---|---|
| S11, S13, S20 Series | ONAN / ONAF | 30 to 10,000 | 10, 20, 35 | 400, 480, 690 | CRGO Silicon Steel | IEC 60076, IEEE C57 |
| SCB11, SCB13, SCB18 | AN / AF (Dry Type) | 50 to 3,150 | 10, 20, 35 | 400, 480 | High-Grade Steel | EN 60076-11, CE |
| SCBH15 Series | AN / AF (Dry Type) | 100 to 2,500 | 10, 20 | 400, 480 | Amorphous Alloy | GB/T 22072, IEC |
| Custom Pad-Mounted | ONAN (Oil-Filled) | 500 to 5,000 | 13.8, 34.5 | 208, 480 | CRGO / Amorphous | ANSI, IEEE C57.12.34 |
Engineered specifically to solve voltage conversion demands across different geological and industrial environments.
Urban subways require high-reliability step-down transformers to convert 35kV municipal power line-ups into stable operating levels for traction rectifiers and auxiliary station installations. Our hermetically sealed, low-maintenance oil-immersed transformers provide runtimes free of structural compromises inside humid tunnel structures.
Smelting lines and chemical processing plants need extremely high currents at low voltages. Henan Pirooz Power supplies specialized rectifier and furnace step-down transformers that manage continuous load cycles, extreme temperature swings, and severe harmonic distortions without insulation breakdown.
Solar arrays and wind turbines generate fluctuating medium-voltage feeds. Our pad-mounted step-down substations safely link power from high-output solar arrays to regional collector cables. Complete enclosure systems ensure optimal performance in harsh desert environments and high-salinity coastal areas.
As the international power community moves toward carbon neutrality and smart-grid infrastructure, the core technology of step-down transformers is shifting rapidly. Henan Pirooz Power is driving active research across three primary design trajectories:
Our industrial cluster location provides global buyers with stable pricing, high material quality, and rapid project turnaround times.
Located in Henan, China, we operate close to premier silicon steel sheet rolling mills, high-purity copper refineries, and specialized component manufacturers. This direct geographical integration protects our clients from raw material delays, shortens custom manufacturing periods, and eliminates intermediary logistical surcharges.
Quality and stability are central to our operational principles. Every transformer undergoes a comprehensive factory acceptance test (FAT) prior to shipping. This testing verifies turns ratio, winding resistance, insulation resistance, load/no-load losses, dielectric strength, and partial discharge characteristics using calibrated high-voltage testing bays.
Detailed technical answers to common questions asked by procurement managers and grid engineers.
The cooling configuration depends on the installation environment and standard load profiles. Dry-type transformers use Air Natural (AN) for standard indoor commercial loads and Air Forced (AF) to manage temporary overload peaks. Oil-immersed units utilize Oil Natural Air Natural (ONAN) cooling. For higher capacities or high-temperature industrial sites, we equip radiators with forced-air fans (ONAF) to optimize heat dissipation.
To minimize voltage drops, our engineers optimize the winding impedance and use high-purity oxygen-free copper coils. Additionally, we integrate On-Load Tap Changers (OLTC) or Off-Circuit Tap Changers (OCTC). These systems allow operators to adjust the turns ratio of the primary windings, maintaining a stable secondary voltage output even during fluctuating grid conditions.
Yes. High altitudes feature lower air densities, which reduces both the dielectric strength of the air and the transformer's natural cooling efficiency. For installations exceeding 1,000 meters, we customize designs by adjusting clearances, increasing external bushing creepage distances, and scaling up the core-and-coil structure to prevent thermal buildup and flashovers.
Amorphous alloy cores have a highly irregular atomic structure, which requires significantly less energy to magnetize compared to grain-oriented silicon steel. This design reduces no-load losses (core losses) by 70% to 80%. For utility networks where transformers operate under low-load conditions for extended periods, these efficiency gains lead to substantial energy savings over the unit's lifespan.
Explore our complete range of high-performance oil-immersed, dry-type, and single-phase transformers.
Pirooz Power
