Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of step down electrical power transformer in China. If you're going to wholesale durable step down electrical power transformer made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
This step-down power transformer is a heavy-duty three-phase oil immersed power conversion solution that perfectly achieves stable step-down conversion of medium and high voltage power grids by using the classic 33kV primary high voltage input and 11kV secondary low voltage output. Equipped with a no-load tap changer (non excitation tap changer) installed on the high-voltage primary winding side. The tap adjustment range reaches ± 2 × 2.5%, and the voltage adjustment steps are flexible, which can cope with unstable input voltage of the power grid, adapt to different regional power grid voltage standards, and ensure stable secondary 11kV output voltage under different working conditions. For projects without the need for uninterrupted tap adjustment, this is an economically reliable voltage regulation option.
Core technical parameters
|
Item |
Technical Data |
|
Rated Capacity |
5 MVA / 5000kVA |
|
Phase |
3 Phase |
|
Primary Rated Voltage |
33kV |
|
Secondary Rated Voltage |
11kV |
|
Tap Changer Type |
No Load Tap Changer (Off-circuit) |
|
Tapping Range |
±2×2.5% (HV Side) |
|
Cooling Method |
ONAN (Oil Natural Air Natural) |
|
Vector Group |
Dyn11 |
|
Frequency |
50Hz / 60Hz Optional |
|
Winding Material |
High Purity Copper |
|
Core Material |
Cold Rolled Silicon Steel Sheet |
|
Insulation Standard |
IEC 60076 |
|
Temperature Rise Standard |
Winding ≤65K |
|
Installation Type |
Indoor / Outdoor |
|
Noise Level |
Low Noise Operation |
|
Protection Accessories |
Oil level gauge, temperature gauge, breather, pressure relief valve, conservator |
|
Customization |
OEM / ODM Custom Available |
|
Certification |
ISO9001, CE, relevant test reports |
Key Features of Step Down Electrical Power Transformer
High Efficiency and Low Loss
Designed with low no-load and load losses to reduce energy consumption and operating costs.
01
Full Copper Windings
High-purity copper conductors ensure excellent conductivity, thermal stability, and long-term reliability.
02
Flexible Voltage Regulation
The off-circuit tap changer allows voltage adjustment to suit different grid conditions.
03
Robust Construction
Heavy-duty steel tank with anti-corrosion coating for reliable indoor and outdoor operation.
04
Long Service Life
Engineered for continuous operation with an expected service life exceeding 25 years.
05
Applicable scenarios
● Utility Power Substations
● Industrial Manufacturing Plants
● Mining Projects
● Solar Power Stations
● Wind Farms
● Commercial Buildings
● Infrastructure Projects
● Rural Power Distribution Networks
Transformer Structure and Design
The transformer core is constructed from high-permeability cold-rolled grain-oriented silicon steel, helping reduce core losses and improve overall efficiency.
The windings are manufactured from high-purity copper to provide excellent electrical conductivity, mechanical strength, and thermal performance.
The ONAN cooling system utilizes natural oil circulation and natural air convection to ensure stable temperature control while minimizing maintenance requirements.
Standard accessories include:
- Conservator Tank
- Oil Level Indicator
- Temperature Gauge
- Pressure Relief Valve
- Silica Gel Breather
Quality Control & Factory Testing
Each transformer undergoes comprehensive factory testing before shipment:
- Turns Ratio Test
- Winding Resistance Test
- No-load Loss Test
- Load Loss Test
- Applied Voltage Test
- Induced Voltage Test
- Insulation Resistance Test
Certificates
Customization Options
We provide OEM and ODM services based on project requirements.
Available customization includes:
- Capacity up to 200MVA
- Voltage up to 230kV
- Different Vector Groups
- ONAN / ONAF Cooling Systems
- Special Environmental Protection Designs
- Customized Color and Nameplate
FAQ
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