2000 KVA Oil Forced Air Forced Transformer
Description
Technical Parameters
Henan GNEE Electric Co., Ltd. is one of the leading manufacturers and suppliers of 2000 kva oil forced air forced transformer in China, also supports customized service with low price. Welcome to buy discount 2000 kva oil forced air forced transformer for sale here from our factory. If you have any enquiry about pricelist, please feel free to email us.
Product Introduction
OFAF cooling transformer is a medium-to-high capacity power device. With a rated capacity of 2000 kVA, it uses an ONAF (Oil Natural Air Forced) cooling system: oil conducts heat naturally, while forced air via fans enhances dissipation. Suitable for industrial/commercial grids (50/60 Hz), it features a robust steel tank, insulation oil for electrical safety, and protective components like Buchholz relays. Capable of handling overloads, it offers high efficiency (>95%) and complies with IEC/IEEE standards. Ideal for substations, renewable projects, or high-load environments, it balances reliability and cost-effectiveness, requiring regular oil maintenance and proper ventilation.
For more details, contact Gnee, a professional ofaf transformer manufacturer, via sales@gneesteels.com, today to obtain the optimal energy solution tailored to your needs!
Product video
Product Parameters
General arrangement drawing
product display
Structure of 2000 kVA Oil Forced Air Forced Transformer
Here's a detailed structural introduction to the 2000 kVA Oil Forced Air Forced Transformer (ONAF), focusing on its core components and operational principles:
1. Core and Windings – The Power Conversion Core
Core Structure:
Made of low-loss silicon steel sheets (e.g., 30Q120 grade) with a step-lap joint design to minimize magnetic flux leakage. The core typically adopts a three-phase five-limb structure (for better harmonic suppression) or a compact three-phase three-limb design, with a cross-sectional area optimized to reduce no-load loss (<1.5 kW for 2000 kVA).
Windings:Primary/Secondary Windings:
High-voltage (HV) windings (e.g., 10 kV) use aluminum or copper stranded wires with multi-layer cylindrical or disc-type structures for high short-circuit withstand capability (impedance voltage: 6–8%).
Low-voltage (LV) windings (e.g., 400 V) employ thick copper strips for low resistance and high current-carrying capacity (rated current: ~2887 A for LV side).
Insulation:
Windings are insulated with Nomex paper or epoxy resin, with oil ducts (3–5 mm) between layers for efficient heat dissipation via forced oil circulation.
2. Oil Immersion System – Insulation and Cooling Medium
Tank:
A welded steel tank (IP54/IP66 protection) with a corrugated fin structure or radiators. The tank is vacuum-filled with mineral oil (or synthetic ester oil for eco-friendly models) to:
Insulate windings and core.
Transfer heat to external cooling systems.
Oil Expansion Tank (Conservator):
A cylindrical tank connected to the main tank via a breather, accommodating oil volume changes due to temperature (expansion rate: ~0.07%/°C). The breather uses a silica gel dryer to prevent moisture ingress.
3. Forced Air Cooling System (ONAF) – Heat Dissipation Core
Cooling Principle:
Combines natural oil circulation with forced air convection:
Hot oil rises from the tank to the radiators (finned tubes).
Axial fans (typically 4–6 units, each 0.5–1.1 kW) blow air across the radiators, accelerating heat dissipation (cooling capacity: ~300 kW for 2000 kVA).
Cooled oil returns to the tank via gravity or pumps, completing the cycle.
Control System:
Temperature sensors trigger fans when oil temperature exceeds 65°C (e.g., setpoints: 65°C start, 55°C stop).
Fans can operate in manual/auto modes, with overload protection (e.g., 120% load for 30 minutes).
4. High-Voltage and Low-Voltage Terminals – Power Input/Output
HV Terminals:
Porcelain or composite insulators (creepage distance: ≥450 mm for 10 kV) with bushing current transformers (CTs) for metering and protection.
Tap changers (on-load or off-load) allow voltage adjustment (±5% in 2.5% steps) to compensate for grid fluctuations.
LV Terminals:
Large copper busbars or cable terminations with protective covers, rated for high currents (e.g., M8 bolts for 1200 A connections).
5. Protection and Monitoring Devices – Operational Safety
Buchholz Relay:
Detects gas accumulation (due to internal faults) and triggers alarms or trips at preset thresholds.
Pressure Relief Valve:
Releases excess pressure (>50 kPa) during faults to prevent tank explosion.
Temperature Gauge:
Digital or dial-type gauges monitor top oil temperature (accuracy: ±2°C) and winding temperature (via RTD probes embedded in windings).
MOA (Metal Oxide Arrester):
Protects against surge voltages (e.g., 40 kV impulse withstand for 10 kV systems).
6. Ancillary Components – System Integration
Lifting Eyes and Base Frames:
Designed for crane installation and seismic resistance (e.g., IEC 61373 Category 1A for vibrations).
Oil Sampling Valves:
Allow periodic oil testing (dielectric strength, moisture content) to ensure insulation integrity.
Control Cabinet:
Houses circuit breakers, relays, and communication modules (RS485/MODBUS) for remote monitoring.
Key Structural Advantages
High Overload Capacity: ONAF cooling enables 1.2× rated load for short periods (e.g., motor starting).
Compact Design: Smaller footprint than air-cooled dry-type transformers (volume: ~3–4 m³).
Wide Temperature Range: Operates in -25°C to +45°C environments with oil type adaptation (e.g., #25 mineral oil for temperate zones).
This structure of oil forced air forced transformer ensures reliable power conversion and heat management in industrial, commercial, and utility applications, balancing efficiency, durability, and cost-effectiveness.
Certificate display
Our company was among the first in the industry to obtain ISO 9001 quality system certification. Our product range encompasses a diverse array of transformers:
High - Voltage Transformers
35kV and 110kV Three - Phase Oil - Immersed Power Transformers: These are engineered to handle high - voltage power transmission and distribution efficiently.
Dry - Type Transformers
Epoxy - Resin Cast Dry - Type Transformers (SCB10, SCB11, SCB12, SCB13, SCB14, SCB18): They feature advanced epoxy - resin casting technology, providing excellent insulation and durability, suitable for various indoor applications.
SH15 Amorphous Alloy Power Transformers: Utilizing amorphous alloy materials, they offer high energy - saving performance, reducing power losses significantly.
Oil - Immersed Power Transformers
S11, S13, S20, S22 Series (6 - 10kV): These classic oil - immersed transformers ensure reliable power distribution at medium - voltage levels.
SZ11, SZ13 Series (35kV) Three - Phase On - Load Tap - Changing Oil - Immersed Power Transformers: They are equipped with on - load tap - changing functionality, enabling voltage regulation under load for stable power supply.
For more detailed information, we' d love to hear from you! Reach out to our team at sales@gneesteels.com.
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