Three-phase Box-type Combined Transformer
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of three-phase box-type combined transformer in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced three-phase box-type combined transformer from our factory. Also, quotation is available.
Product Overview
This series of combined transformers for wind power generation (hereinafter "wind power transformer") is applicable to 10kV and 35kV terminal power supply systems, serving as a device for power transformation, distribution, metering, control and protection.
In addition to the transformer, the HV side is equipped with a four-position or two-position load switch, backup protection fuse and plug-in fuse. Transformer oil is used as the insulating and arc-extinguishing medium.
Core Features
Compact & lightweight, easy to install Integrated design of transformer, switchgear and protection in one cabinet. Small footprint and light weight simplify transport, hoisting and site installation, cutting construction time.
Low noise & loss, energy-saving High-grade low-loss silicon steel core and optimized windings cut no-load & load losses. Noise suppression design delivers quiet operation and long-term energy saving.
Fully sealed, anti-theft All-welded sealed tank with live parts fully enclosed. No exposed live components to avoid unauthorized access and component theft, improving outdoor safety.
Low maintenance, stable performance Vacuum oil filling isolates oil from air to slow aging and extend maintenance cycles. Modular plug-in fuses enable quick replacement and reduce O&M work.
High overload capacity, full-range fuse protection Supports short-time overload for fluctuating wind power. HV full-range current-limiting fuse reliably breaks all fault currents from minimum melting current to rated short-circuit breaking current.
Adaptable to harsh environments (cold, high altitude, heavy sandstorm). Corrosion-resistant enclosure with special surface finish, IP54 rating. Stable operation at -40℃, high altitude and heavy sandstorms. LV breakers adopt low-temperature components for extreme temperature reliability.
Main Technical Parameter
|
Item |
Parameter |
|
Primary voltage |
35kV |
|
Secondary |
0.66kV |
|
Frequency |
50Hz |
|
Rated capacity |
630-1600kVA |
|
Cooling method |
ONAN |
|
Fuse cuts off the current |
31.5kV |
|
Environment temperature |
-35~+40℃ |
|
Winding allows for temperature rise |
65℃ |
|
No load tap changer |
±2x2.5%, ±5% |
|
Noise grade |
50db |
|
Protection level |
IP43 |
Operating Environment Conditions
- Ambient Temperature: Maximum +40℃, minimum -30℃
- Altitude: ≤ 1000m
- Wind Speed: Equivalent to 34m/s (not exceeding 700Pa)
- Humidity: Daily average relative humidity ≤ 95%; monthly average relative humidity ≤ 95%
- Seismic Protection: Horizontal acceleration ≤ 0.4m/s², vertical acceleration ≤ 0.15m/s²
- Installation Site Inclination: Not greater than 3°
- Installation Environment: The surrounding air shall be free from significant pollution by corrosive or flammable gases, and the installation site shall be free from severe vibration.
If the product is to be used under conditions exceeding the above specifications, specific requirements can be negotiated with our company for customized solutions.
Application
- Onshore Centralized Wind Farms: Suitable for plain, hilly and mountainous onshore centralized wind projects.
- High-Altitude & Cold-Region Wind Projects: For sites up to 3000m altitude and -40℃ extreme cold (NW & SW China). Low-temperature LV breakers and cold-proof sealing guarantee reliable switching under frigid conditions.
- Desert, Gobi & Sandy Wind Projects: Ideal for windy desert/Gobi areas with heavy sandstorms and sharp diurnal temperature changes.
- Coastal & Salt-Spray Wind Projects: For eastern coasts, tidal flats and nearshore zones. Anti-corrosion treatment on enclosure and metal parts withstands salt spray and humid corrosion.
- Distributed Wind Projects: Suitable for decentralized wind near load centers: industrial parks, mines, farms and remote power supply. Compact footprint and simple installation enable direct grid connection for local wind power consumption and lower transmission loss.
FAQ
Q1: How to select the appropriate rated capacity for the wind power generation?
A: Select based on the rated output power of the matching wind turbine generator, generally 1.0–1.1 times the turbine rated power. For example, a 1500kW turbine should use a 1600kVA combined transformer. Consider the annual average wind speed and turbine output characteristics, with appropriate margin.
Q2: How to choose between 10kV and 35kV voltage levels for wind power generation?
A: It mainly depends on the voltage level planning of the wind farm collection line. For smaller unit capacity (≤1000kW) and small-scale wind farms, 10kV is typically used; for larger unit capacity (≥1500kW) or large-scale wind farms with long transmission distances, 35kV is preferred to reduce line losses. The specific selection should be determined per the wind farm substation grid-connection system design.
Q3: Can the pad mounted transformer operate under overload? What is the overload capability?
A3: The transformer has certain short-time overload capability. Within the normal service life, periodic short-time overload operation is allowed; the specific overload ratio and duration should be determined based on winding hot-spot temperature and ambient temperature, referring to IEC 60076-7 loading guide. In wind power scenarios with large output fluctuations, daily operation should not exceed rated capacity, and short-time overload should not exceed 120% rated current.
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