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Technical Characteristics Table of Mining Transformers
| Technical Characteristic | Detailed Description |
|---|---|
| Classification and Type | Divided into mining flameproof dry-type transformers and mining general oil-immersed transformers to meet varying explosion risk environment requirements. |
| Flameproof Structure | Flameproof models utilize a fully corrugated cylindrical flameproof enclosure with an oblong cross-section (semicircular top and bottom, straight sides) and a one-piece formed irregular corrugated tube. The enclosure is equipped with guiding cooling fins to ensure efficient heat dissipation and mechanical strength. |
| Insulation System | Utilizes H-class DuPont NOMEX® insulation materials from the USA, featuring non-encapsulated oblong coils with a flat copper wire vertical winding structure. Treated via VPI (Vacuum Pressure Impregnation) process, impregnated with solvent-free insulating varnish, and baked for curing, resulting in high electrical strength and strong impact resistance. |
| Core Material | Selects high-permeability cold-rolled silicon steel sheets with an oblong cross-section and a hole-free H200 tight binding method, ensuring a compact structure, low losses, and reduced noise. |
| Protection Rating | Flameproof enclosures can withstand internal pressures of 0.8-1 MPa, complying with explosion-proof standards; general oil tanks can withstand pressures of 0.1 MPa, achieving an IP44 or higher protection rating to adapt to harsh mine environments. |
| Cooling System | Natural ventilation or forced air cooling (axial fans), with some models equipped with intelligent temperature control systems that automatically adjust fan speed based on load to maintain stable operating temperatures. |
| Electrical Performance | No-load losses are reduced by an average of 14% compared to the GB8286-1996 national standard, while load losses are reduced by an average of 10%; partial discharge levels are ≤10 pC, indicating excellent insulation performance. |
| Capacity and Voltage | Offers a wide rated capacity range (e.g., 2.5 kVA to 1600 kVA), with high-voltage side support for voltage regulation at 11/10.5/10/6.3 kV and low-voltage side providing multiple wiring modes such as 400 V and 690 V. |
| Overload Capacity | Allows short-term overloads of 20%-30% (sustained for 2 hours) to accommodate load fluctuations in mining operations. |
| Environmental Adaptability | Withstands dust, corrosive gases, and high temperatures; special designs are required for high-altitude areas to compensate for heat dissipation; enclosures are made of stainless steel or galvanized steel plates for resistance to moisture and corrosion. |
| Installation and Transportation | Features a compact structure and lightweight design, equipped with skids for convenient transportation on mine railway tracks; installation should avoid areas prone to water splashing or dust accumulation to ensure proper ventilation and heat dissipation. |
| Maintenance and Monitoring | Regularly inspect insulation resistance (≥100 MΩ) and grounding resistance (≤4 Ω), monitor oil quality, infrared images, and partial discharges; some models are equipped with temperature controllers and digital temperature monitoring instruments for over-temperature alarms and interlock protection. |
| Safety Certifications | Complies with GB 3836.1-2021 (General Requirements for Equipment in Explosive Atmospheres) and AQ 1070-2009 (Safety Technical Requirements for Mining General Electric Transformers), and has passed the Mining Product Safety Mark Certificate (MA Mark) certification. |
| Typical Application Scenarios | Essential for gas mines (flameproof models such as the KBSG series must be selected), preferred for powering mobile equipment (mobile substations such as the KBSGZY series are prioritized), and used for underground low-voltage power distribution (secondary side voltage levels are selected based on load type). |
The main products include oil immersed transformers, dry-type transformers, power transformers, amorphous alloy transformers, mining transformers, box type substations, high and low voltage switchgear and supporting products
Add: South Head of Mount Huangshan Road, Liaocheng Development Zone, Shandong, China
Email:sdbyqcj@163.com
Tel: +86 13706354419
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