S22-M Series 20kV Three Phase Oil Immersed Distribution Transformer
Scope of Application
European Urban Medium-Voltage Grids
European cities commonly adopt the 20kV standard for medium-voltage distribution, which offers lower line losses compared to 10kV systems. Hanzhong Xinsanhuan’s 20kV oil-immersed transformers fully comply with EU grid standards; they significantly reduce cable losses, ensuring more cost-effective operation for both urban and suburban distribution networks.
Large-Scale Industrial Parks
Do chemical and machinery manufacturing enterprises face frequent equipment start-stops and heavy load surges? The 20kV voltage level provides greater power capacity, easily handling heavy loads and withstanding surge currents to ensure production lines keep running without interruption.
Upgrading Remote Rural Grids
Do long-distance power transmission projects in remote mountainous areas and villages suffer from high line losses and prohibitive renovation costs? At the 20kV level, transmission current is halved and line losses drop to one-quarter of previous levels. This enables longer transmission distances and ensures adequate voltage at the grid's edge—delivering clearly visible savings on infrastructure investment.
Product Description
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1 - Saving power means saving money: S22 core design minimizes no-load losses; the annual electricity cost savings speak for themselves.
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2 - Withstands lightning strikes: Class F insulation and a 125kV withstand rating ensure rock-solid stability during thunderstorms—no tripping.
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3 - Survives short circuits: Uses oxygen-free copper and integral clamping; coils remain undeformed during sudden short circuits, eliminating the need for replacement.
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4 - Voltage regulation tailored to conditions: Use off-circuit regulation for stable voltage, or on-load regulation for high-fluctuation scenarios—adjust in real-time without power outages.
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5 - Future-proof upgradeability: Comes fully equipped with gas, temperature, and pressure relief monitoring; communication ports are pre-installed, allowing for an easy upgrade to smart capabilities via module addition.
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Main parameters
Rated Voltage and Capacity: 20kV/0.4kV; capacity 30kVA–2500kVA; customization of non-standard dimensions available
High-Voltage Tapping Range: Standard ±2×2.5% off-circuit tap changing; optional ±8×1.25% wide-range on-load tap changing
Cooling Method: Standard ONAN (oil-immersed natural cooling); optional ONAF (forced air cooling) for long-term heavy-load operation
Winding Connection Group: Standard Dyn11/Ynd11 balanced three-phase connection; other connection groups available upon request
Execution standards
Technical advantages
The design philosophy behind this 20kV oil-immersed transformer boils down to one thing: minimizing losses while maximizing safety margins. It features a core made of high-permeability, premium-grade silicon steel sheets assembled with a fully mitered joint process, effectively keeping no-load losses and noise levels low. The windings utilize oxygen-free copper and an integrated clamping structure, ensuring the coils remain intact and undeformed during sudden short-circuit events—a capability proven through rigorous type testing. Even more impressive is its versatility; it operates reliably in environments ranging from the -40°C snowlines of high-altitude plateaus to the +45°C heat of tropical islands, and from humid coastal regions to dust-laden mining areas. When it comes to daily operation and maintenance—often the most tangible aspect for users—it excels. The fully sealed corrugated oil tank completely blocks out air and moisture, preventing oil oxidation and leakage; there is no need to worry about frequent oil changes or top-ups, making it essentially a "set-and-forget" unit. Comprehensive protection devices—such as pressure relief valves and gas relays—come standard, enabling automatic pressure relief and early warnings during critical moments, shifting the operational model from "rushing to the site after a failure" to "receiving alerts before a problem escalates." Ultimately, this isn't a piece of equipment that demands constant attention. It simply does its job: saving on electricity costs, withstanding operational surges, and shrugging off harsh environmental challenges. It complies with both IEC and GB standards, making it suitable for projects in Europe and Southeast Asia alike, with customizable configurations and uncompromising quality.