Henan New Electric Power Co.,ltd.
| Type of cooling | ONAN oil is self-cooled |
| Delivery Time | 7-14 work days |
| Application | Substation |
| Payment Terms | L/C,D/A,D/P,T/T,Western Union |
| Rated Voltage | 11kV / 13.8kV / 24kV / 33kV / 34.5kV |
| Ambient Temperature | -25°C to +55°C |
| Phase | Three |
| Supply Ability | 5000pcs/year |
| Capacity/KVA | 25kVA–5000kVA / Up to 1250A |
| Rated frequency | 50Hz/60Hz |
| Short Circuit Withstand | 20kA–31.5kA (3s) |
| Cooling / Insulation | ONAN / Air Insulated |
| Packaging Details | Export standard packaging |
| Customization | Voltage, Capacity, Current, IP Rating, Color, OEM Logo |
| Protection Degree | IP54 / IP65 |
| Standards | IEC 60076 / IEC 62271 / IEC 61439 |
| Model Number | S11/S13/S20 |
| Brand Name | TNNPI |
| Certification | CE,UL,ISO |
| Place of Origin | Henan, China |
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Product Specification
| Type of cooling | ONAN oil is self-cooled | Delivery Time | 7-14 work days |
| Application | Substation | Payment Terms | L/C,D/A,D/P,T/T,Western Union |
| Rated Voltage | 11kV / 13.8kV / 24kV / 33kV / 34.5kV | Ambient Temperature | -25°C to +55°C |
| Phase | Three | Supply Ability | 5000pcs/year |
| Capacity/KVA | 25kVA–5000kVA / Up to 1250A | Rated frequency | 50Hz/60Hz |
| Short Circuit Withstand | 20kA–31.5kA (3s) | Cooling / Insulation | ONAN / Air Insulated |
| Packaging Details | Export standard packaging | Customization | Voltage, Capacity, Current, IP Rating, Color, OEM Logo |
| Protection Degree | IP54 / IP65 | Standards | IEC 60076 / IEC 62271 / IEC 61439 |
| Model Number | S11/S13/S20 | Brand Name | TNNPI |
| Certification | CE,UL,ISO | Place of Origin | Henan, China |
| High Light | Oil-Immersed Power Transformer 5MVA–30MVA ，Oil-Immersed Power Transformer IEC 60076 ，60Hz Oil-Immersed Power Transformer | ||
TNNPI oil-immersed power transformers are engineered for transmission substations, industrial power systems, renewable energy integration, and utility grid expansion. Covering ratings from 5MVA to 30MVA with voltage classes up to 220kV, these transformers provide outstanding operational reliability, low lifecycle costs, and stable performance under continuous heavy loads.
The transformer utilizes high-grade grain-oriented silicon steel with optimized step-lap core construction to reduce magnetic losses and improve operating efficiency. Precision engineering ensures excellent voltage regulation and reduced operating noise.
Windings are manufactured using oxygen-free copper or high-conductivity aluminum conductors with reinforced insulation systems designed for high short-circuit withstand capability. Vacuum drying and oil treatment enhance dielectric performance and extend service life.
Available with multiple cooling methods, tap changers, and protection accessories, each transformer can be configured for transmission substations, industrial plants, renewable energy stations, and national grid projects.
Every transformer undergoes strict electrical and mechanical testing before delivery, ensuring reliable operation throughout its service life. Additional witness testing can be arranged according to customer requirements.
| Item | Specification |
|---|---|
| Rated Capacity | 5–30MVA |
| Highest Voltage | Up to 220kV |
| Frequency | 50Hz / 60Hz |
| Phase | Three Phase |
| Cooling Method | ONAN / ONAF / OFAF |
| Tap Changer | OLTC / NLTC |
| Winding Material | Copper / Aluminum |
| Insulation Class | Mineral Oil / FR3 Optional |
| Standards | IEC 60076, ANSI/IEEE C57 |
| Service Life | ≥30 Years (Proper Maintenance) |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Seller,Exporter
Year Established:
2017
Total Annual:
>30000+
Employee Number:
260~300
Ecer Certification：
Verified Supplier
Henan New Electric Power Co., Ltd. is more than just a manufacturer; we are your strategic partner in building resilient and efficient power distribution networks. With a dual-core manufacturing capability in High/Medium Voltage Power Transformers and Advanced Switchgear Systems,... Henan New Electric Power Co., Ltd. is more than just a manufacturer; we are your strategic partner in building resilient and efficient power distribution networks. With a dual-core manufacturing capability in High/Medium Voltage Power Transformers and Advanced Switchgear Systems,...
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