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S-100-30/0.41
YAWEI
>> Product Introduction
Product Advantage
1. High‑Efficiency Core with Low Losses
At the heart of this transformer is a high‑permeability, low‑loss cold‑rolled silicon steel core. This material choice significantly cuts both no‑load and load losses during operation. The result is reduced standing power consumption, tangible energy savings over the unit’s lifetime, and a measurable improvement in overall distribution efficiency.
2. Superior Performance from Dyn11 Connection
The Dyn11 winding arrangement delivers excellent grid compatibility. It actively suppresses harmonics, balances phase currents, and minimises zero‑sequence components. This keeps the secondary‑side voltage clean and stable, protecting downstream low‑voltage equipment from distortion and ensuring consistent power quality.
3. Well‑Balanced 5.5% Impedance
With a standard 5.5% short‑circuit impedance, this transformer strikes an optimal balance between fault‑current limitation and voltage regulation. It effectively dampens sudden short‑circuit events while preventing excessive voltage sag under heavy loads – making it adaptable to a wide variety of supply conditions.
4. Environmentally Responsible Insulation
The insulating medium is PCB‑free 25# mineral oil, which offers high dielectric strength and good heat transfer without posing environmental hazards. The overall insulation system is carefully designed to resist electrical breakdown, ensuring reliable performance and safety throughout the transformer’s extended service life.
5. Reliable Natural‑Oil Cooling
The ONAN cooling scheme relies on natural oil circulation to dissipate heat evenly across the windings and core. This passive system maintains safe temperature rise limits automatically, preventing hotspots and enabling continuous full‑load operation without active cooling equipment or extra energy consumption.
6. Robust, Weather‑Resistant Construction
The tank is fabricated from heavy‑gauge steel plate and coated with a durable anti‑corrosion finish. This provides strong resistance to mechanical impacts and harsh outdoor environments. The fully sealed design keeps moisture and contaminants out, significantly lowering routine maintenance demands and supporting long‑term field reliability.
>> Technical Parameters
| Type | Three Phase Oil-immersed Distribution Transformer |
| Model | S-M-100-30-0.41 |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 100KVA or others |
| Cooling Method | ONAN |
| Primary Voltage | 30KV |
| Secondary Voltage | 410V or others |
| Rated Frequence | 50/60HZ |
| Insulation oil | Mineral oil |
| Tapping Range | ±2×2.5%/±5% |
| Temperature rise℃) | 65 |
| Connection Group | Dyn11/Yyn0 |
| Total weight(kg) | 1700 |
>> Product Uses
1. Urban Power Distribution Networks
This 20kV transformer is a natural fit for city‑grid refurbishment and residential supply projects, where it converts 20kV medium voltage to 0.41kV for end‑user consumption. The ONAN cooling system runs quietly, easily meeting municipal noise limits, and ensures stable performance even in densely built neighbourhoods.
2. Industrial Power Systems
Within factory complexes and industrial zones, this unit acts as a central distribution hub. It provides firm voltage support and robust overload tolerance, absorbing the strain of heavy machinery starts and peak‑period demand, thereby maintaining uninterrupted power for production lines and critical equipment.
3. Renewable Energy Integration
Designed as a grid‑interface transformer for photovoltaic and wind farms, it handles variable generation profiles with ease while preserving high conversion efficiency. Enhanced with anti‑corrosion coatings and sealed enclosures, it withstands outdoor exposure, including humid coastal climates, without compromising reliability.
4. Rural Electrification Projects
This transformer is well‑suited for rural network upgrades and isolated village supplies, thanks to its minimal maintenance demands and wide temperature tolerance. Its automatic voltage regulation compensates for grid fluctuations, delivering consistent power for residential loads and agricultural machinery in remote areas.
5. Critical Infrastructure Support
From transit systems and commercial complexes to public service buildings, this unit ensures steady power for vital facilities. The completely sealed tank prevents oil leaks and shields against dust and moisture, allowing both indoor and outdoor installation while providing fail‑safe power for mission‑critical operations.
>> Product Accessories and Routine Tests
Lifting lug
HV bushing
LV bushing
Off load tap changer/On load tap changer
Pressure relief valve
Drain & Sampling valve
Nameplate
Oil temperature indicator
Oil level indicator
Measurement of Insulation Resistance
Voltage Ratio Measurement and Vector Group Verification Test
Measurement of No-load Loss and Current
Measurement of Winding Resistance
Measurement of Short-circuit Impedance and Load Loss
Induced Voltage Withstand Test
Separate-Source Power-Frequency Voltage Withstand Test
Leak Test
Oil Test
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