The SGB10 series three-phase double-roller dry-type transformer (10KV/0.4KV) is a high-performance power equipment that meets strict technical requirements, with excellent insulation, overload, and environmental adaptability. Below is a systematic sorting of its core technical parameters and key performance advantages to clarify its application value and compliance standards.
1. Core Technical Specifications
(1) Basic Model & Voltage Ratio
- Model: SGB10 series three-phase double-roller dry-type transformer (the “double-roller” refers to the core structure, ensuring stable magnetic circuit transmission).
- Voltage Ratio: 10KV (high-voltage side) / 0.4KV (low-voltage side) – matches the most common medium-to-low voltage distribution grid specifications in China, suitable for industrial and commercial power supply.
(2) Connection Group & Neutral Configuration
- Connection Group Label: Dyn11
- Advantages: Strong resistance to unbalanced loads, small zero-sequence current impact, and consistent with the neutral point grounding requirements of low-voltage distribution systems.
- Low-Voltage Side Neutral Lead: Equipped with a dedicated neutral lead terminal, supporting direct grounding of the neutral point (meets GB 50054 power distribution design standards).
(3) Cooling & Insulation Performance
| Technical Indicator | Specification |
|---|---|
| Cooling Method | Fan cooling (forced air cooling, AF) – supports automatic fan start/stop based on temperature. |
| Insulation Class | H class (primary) / C class (optional); temperature rise limit: 125K (H) / 150K (C); maximum operating temperature: 180°C (H) / 220°C (C). |
| Insulation Withstand Voltage | Lightning impulse withstand voltage (peak): ≤75KV; 1-minute power frequency withstand voltage (rms): ≤35KV – meets the insulation requirements of 10KV medium-voltage equipment. |
| Standard Compliance | Temperature rise limits comply with GB6450-1986《Dry-Type Transformers》 (note: the latest national standard is GB6450-2015, and parameters can be adjusted to meet updated standards upon request). |
(4) Operation & Durability
- Neutral Point Operation Mode: Direct grounding – suitable for low-voltage distribution networks that require stable neutral point potential (e.g., residential communities, industrial parks).
- Service Life: ≥30 years – guaranteed by high-quality materials (cold-rolled silicon steel sheets, Class H insulation) and precision manufacturing processes.
- Overload Capacity:
- In closed dry-type transformer cabinets, it can operate at full load for a long time under high ambient temperatures.
- With intact fan cooling and good external ventilation, it can operate at 120% rated load safely and reliably (short-term overload for 2 hours, long-term overload for 1 hour).
2. Key Performance Advantages
(1) Strong Environmental Adaptability
- Three-Proof Ability: Excellent moisture resistance, dust resistance, and smoke resistance – can be used in semi-harsh environments (e.g., coastal areas with high humidity, workshops with mild dust).
- Post-Drying Operability: After being damp, it can be safely put into operation again after standard drying treatment (no permanent insulation damage).
(2) High Safety & Environmental Friendliness
- Flame Retardancy: Does not self-ignite under normal operation; even when exposed to external fire sources, it does not release harmful gases (e.g., toxic fumes) – meets fire safety requirements for indoor installations (e.g., high-rise buildings, data centers).
3. Typical Application Scenarios
The SGB10 series dry-type transformer is mainly suitable for:
- Urban and rural low-voltage distribution networks (10KV grid access, 0.4KV user power supply).
- Indoor power supply scenarios with high safety requirements: high-rise buildings, hospitals, data centers, and shopping malls.
- Industrial sites with mild environmental challenges: mechanical processing workshops, food factories, and electronics manufacturing plants.
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