Energy-efficient 35kV copper-wound distribution transformer for regional power grids
Scope of Application
Large-scale Wind and Solar Energy Bases
Intermittent generation and significant grid-connection voltage fluctuations? Designed specifically for MW-scale integrated wind, solar, and storage systems, this solution ensures stable power aggregation and intelligent voltage regulation, transforming volatile renewable energy into a controllable, grid-compatible resource.
Regional Backbone Power Grids
Concerns about high line losses during substation capacity expansion or long-distance rural power transmission? Engineered for backbone grid transmission, this solution minimizes voltage drop and maximizes energy efficiency, ensuring power reaches end-users across vast distances without degradation.
Heavy Industry and Mining Areas
Frequent heavy-load surges from metallurgical, chemical, and mining equipment overwhelming standard transformers? With a high-capacity design and a reinforced structure resistant to short-circuit forces, this solution is built to handle the toughest heavy-load shocks, ensuring uninterrupted production lines.
Product Description
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1 - High-grade laser-scribed silicon steel core with fully mitered joints: Worried about gaps in the core causing high no-load losses and complaints about humming noise? Laser scribing combined with fully mitered joints effectively minimizes both losses and noise.
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2 - Reinforced high-voltage insulation structure: Concerned about dielectric breakdown from massive lightning surges (hundreds of thousands of volts) during outdoor storms? The thickened insulation withstands 200kV lightning impulse voltages, ensuring rock-solid stability even in stormy weather.
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3 - Fully clamped copper windings: Worried that the sudden impact of a grid short-circuit might deform the coils? Fully clamped copper windings provide maximum mechanical strength, enabling the unit to withstand severe impact forces.
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4 - Dual voltage regulation options: Is the grid voltage consistently too high or too low, rendering standard off-circuit regulation insufficient? Choose between the standard ±2×2.5% off-circuit regulation model or the optional on-load tap changer to ensure stable voltage regardless of grid conditions.
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5 - Comprehensive safety protection system: Worried that by the time personnel arrive on-site, internal transformer faults have already escalated? A four-layer protection system—featuring a gas relay, temperature monitoring, pressure relief device, and remote communication—provides early warnings and automatic response to issues.
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Main parameters
Rated Voltage and Capacity: 35kV/10kV, 35kV/0.4kV; capacity 630kVA–31500kVA; non-standard customization available
Tap-Changing Range: Standard: ±2×2.5% off-circuit tap changing (NLTC); optional: ±8×1.25% on-load tap changing (OLTC) for wide-range regulation
Cooling Method: Standard: ONAN (oil-immersed natural cooling); optional: ONAF (oil-immersed forced-air cooling, suitable for continuous heavy-load conditions)
Winding Connection Group: Standard: YNd11 / Dyn11 (three-phase balanced connection); other groups available upon request
Execution standards
Technical advantages
The Hanzhong Xinsanhuan 35kV oil-immersed distribution transformer is not merely a scaled-up version of 10kV models; it represents a systematic upgrade designed to address the specific challenges associated with higher voltage levels—namely insulation, short-circuit withstand capability, heat dissipation, sealing, and noise control. Its insulation system employs a segmented high-voltage coil arrangement combined with an electrostatic shielding structure for voltage equalization; this effectively optimizes the electric field distribution and significantly enhances lightning impulse withstand capability, ensuring reliable operation even in regions prone to frequent thunderstorms. Mechanical strength is reinforced through a design featuring fully compressed coils and a rigid frame structure, enabling the unit to successfully pass national-level sudden short-circuit tests and withstand instantaneous impact forces on the 35kV side that are several times greater than those experienced by 10kV units. Heat dissipation is optimized via a vertical oil duct design within the high- and low-voltage coils, allowing insulating oil to flow through the hottest sections of the windings; this drastically reduces hotspot temperature rise and slows the rate of insulation aging. A fully sealed corrugated oil tank completely isolates the interior from air and moisture, preventing oil oxidation and moisture absorption over the unit's lifespan and eliminating the need for frequent oil replenishment or maintenance. Noise reduction is achieved through a multi-faceted approach—optimizing the magnetic circuit, refining core joint assembly, and utilizing vibration-dampening mounts—resulting in noise levels that surpass national standards and ensure no disturbance to nearby residential areas. These transformers are already operating reliably in numerous 35kV substations and industrial projects. They offer a choice between off-circuit and on-load voltage regulation and support smart monitoring upgrades, making them an ideal, energy-efficient, reliable, and low-maintenance solution for high-voltage distribution applications. Please feel free to contact us for more information.