35kV Large Capacity Dry Type Power Transformer
Scope of Application
Large-Scale Wind & PV Centralized Base
Serves as main booster transformer for megawatt-level new energy bases, coping with large fluctuating power flow.
Urban 35kV Main Substation
Installed in downtown indoor power houses, no oil leakage risk for dense commercial & residential load centers.
Heavy Chemical & Mining Industrial Park
Matches high-capacity production lines, withstands frequent impact loads and corrosive workshop atmosphere.
Product Description
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1 - Max capacity reach 25000kVA, integral thickened HV winding to bear 170kV lightning impulse voltage
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2 - Multi-layer axial air duct structure solves hot spot problem under long-term full-load operation.
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3 - H-grade composite insulation system, stable temperature rise under continuous heavy load circulation.
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4 - Dual tap schemes: standard ±2×2.5% off-circuit tap changer, optional OLTC on-load voltage regulation.
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5 - Full copper foil winding with integral clamping, strong mechanical resistance against sudden short-circuit.
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6 - Built-in multi-channel PT100 temperature sensors, auto fan control and remote communication reserved.
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Ultra-Large Capacity Reinforced Winding
Features a new high-permeability magnetic core, reducing no-load losses by 18%.
Multi-Axial Channel Heat Dissipation
Multi-layer axial air channels eliminate hot spots during long-term full-load running.
170kV High Impulse Withstand Design
Optimized high voltage electric field to resist lightning surge in mountain power stations.
H-Class Continuous Heavy-Load Insulation
180℃ heat-resistant material keeps stable insulation under 24h full-load cycle.
Low Partial Discharge Vacuum Casting
Full vacuum resin pouring controls partial discharge value below 5pc for high safety.
Dual Tap Regulation Optional
Choose power-off NLTC or uninterrupted OLTC tap per grid voltage fluctuation.
Main parameters
Voltage & Large Capacity Range: HV:35kV; LV:10kV/0.4kV; capacity range 6300kVA–25000kVA full customized
Cooling & Insulation Grade: H-grade insulation (180℃); AN natural air cooling, AF forced air cooling (boost capacity 50%)
Tap Changer Configuration: Standard ±2×2.5% NLTC; optional ±8×1.25% OLTC wide-range on-load tap changer
Short-Circuit & Communication Index: Short-circuit impedance 6%–10%; support Modbus RTU/TCP, IEC61850 remote monitoring
Execution standards
Technical advantages
Unlike small-capacity dry-type transformers, our 35kV high-capacity models feature integral, thickened high-voltage copper foil windings. Produced using vacuum casting and precision compression techniques, the coils effectively withstand the immense mechanical stresses generated during full-load short-circuit faults, thereby meeting the demands for long-term, high-power operation at large-scale renewable energy sites. Integrated multi-layer axial cooling ducts within the high- and low-voltage coils fundamentally eliminate the localized overheating issues common in conventional high-capacity dry-type transformers. The unit utilizes a core made of high-permeability, low-noise silicon steel sheets; with minimal magnetostrictive vibration and an operating noise level below 58 dB, it is ideally suited for urban indoor substations near residential areas, as well as underground distribution rooms, chemical plants, and city-center substations. Equipped with an automatic temperature-controlled fan system and remote cloud monitoring capabilities, the equipment significantly reduces the workload associated with routine operation and maintenance. This product series has passed comprehensive type testing and obtained export certifications such as CE and ISO; it is widely deployed in large-scale domestic industrial and wind/solar power projects, as well as in high-capacity power engineering projects overseas.