Rectifier transformer

Rectifier transformers are specialized transformers designed specifically for rectifying power supply in mines. Their primary function is to convert industrial-frequency alternating current (AC) to direct current (DC). These products are manufactured in strict compliance with national and industry standards, such as GB/T 1094.11 and JB/T 3837, and are certified for mining product safety by the KY/KA standard.

They are suitable for power supply in non-explosive areas underground, as well as for above-ground rectification equipment (eg mine electrolysis, plating and DC applications). They combine high rectification efficiency, high harmonic tolerance, and excellent adaptability to harsh mine environments, providing stable and efficient DC support for DC mine equipment and electrochemical operations.

1. Key performance parameters(customizable)

Voltage: 3 kV, 6 kV, 10 kV, 110 kV;

• Power: 10 kVA-125000 kVA.

• Type: oil, dry (fire-resistant).

• Cooling systems: ONAN, ONAF, AN, AF.

• Protection class: IP54, IP65.

Standard thermal insulation classes: class F (155℃), class H (180℃); class C is available for underground spaces with high temperatures and high humidity.

Insulation materials: high-quality insulating oil, epoxy resin, DuPont NOMEX® paper.

Stable thermal insulation properties even at a relative humidity of ≥ 95% with condensation formation.

Oil compressor: ONAN / ONAF with enlarged corrugated tank and radiators.

Dry type: AN/AF with intelligent low noise fans with temperature control.

Effectively controls temperature rise and prevents aging of thermal insulation.

Closed metal case.

Outdoor use: IP54; underground application: reinforced dust, moisture and waterproof design.

No exposed parts to avoid electric shock.

• Iron core:low lossOriented silicon steel, optimized for harmonic stability, with shock absorbing pads.

• Rectifier windings: oxygen-free copper, special transposition winding, low harmonic loss, high short-circuit resistance.

• Tank/Housing: Fully sealed corrugated oil tank (oil type); fire-resistant, dust-proof, corrosion-resistant steel (dry type ).

• Impact-resistant design: reinforced fastenings, shock-absorbing pads, base plate and lifting eyes for transport and installation in mines.

• Protection and accessories: overload, short-circuit, overvoltage/undervoltage, and current leakage protection; oil and winding temperature monitoring; optional harmonic suppression and remote monitoring.

2. Main advantages of the product

• High rectification efficiency, low ripple, stable output DC current, low harmonic distortion.

• Mining Certified (Kentucky/Canada), Totally Enclosed, Safe for Underground Non-Hazardous Areas.

• Wide temperature range: from -20℃ to +40℃, high humidity, dust and vibration resistance.

• High resistance to overload and impact, ensuring continuous production.

• Low loss, level 1 energy efficiency, energy saving, long service life (more than 30 years).

• Compact, easy to transport, install and maintain; low operating costs.

3. Typical areas of application

• Underground rectifier power supply for DC fans, pumps, conveyors, electrolysis plants, lighting.

• Grounding systems with rectifier for electrolysis, galvanic coating, DC drives.

• Mine emergency DC power supply, control systems, communication equipment.

• Tunnels, metallurgy, chemical industry and other harsh industrial conditions.