Explosion proof mining dry-type transformer

　　An explosion proof mining dry-type transformer is a special electrical equipment used in mines, which is designed to provide safe and reliable power supply in environments with explosion risks. Here is a detailed introduction:

　　Structure and Principle

　　Structural Features: It mainly includes a transformer body, a high-voltage incoming line terminal high-voltage head, and a low-voltage outgoing line terminal low-voltage head. The box shell's joint surfaces are made according to explosion-proof requirements and can generally withstand an internal pressure of 0.8 MPa to 1.0 MPa. The进出线 is led out through cable outlets.

　　Insulation System: It adopts solid insulation, composite insulation (air + solid), and surface insulation. The solid insulation is composed of casting resin and resin-impregnated materials. The insulation between the high and low voltage windings, the insulation between the high voltage winding and the iron core, etc., are composite insulation, and the overall insulation strength depends on the air gap to a certain extent.

　　Working Principle: Similar to ordinary transformers, it is based on the principle of electromagnetic induction. The alternating current in the primary winding generates an alternating magnetic field in the iron core, and this magnetic field induces an electromotive force in the secondary winding, achieving voltage transformation.

　　Technical Parameters

　　Rated Capacity: Usually ranging from 50 kVA to 8000 kVA.

　　Rated Voltage: The primary voltage is generally 6 kV or 10 kV, and the secondary voltage is 3300 V, 1140 V, 660 V, 380 V, etc.

　　Insulation Class: Commonly H-class and C-class insulation.

　　Explosion-proof Type: Usually of the mine flameproof type, with the explosion-proof mark ExdI.

　　Product Features

　　Explosion-proof Performance: The closed explosion-proof shell can prevent the explosion - proof transformer from igniting the explosive gas mixture outside the shell when an internal fault occurs, effectively preventing the spread of explosion.

　　Good Insulation Performance: It often uses high - quality insulation materials such as Nomex insulation paper, with high - temperature resistance, flame retardancy, and other characteristics. The coil is processed by vacuum pressure impregnation (VPI) to improve insulation performance and mechanical strength.

　　Strong Adaptability to the Environment: It is designed to be suitable for the harsh environment of mines, with the characteristics of moisture - proof, dust - proof, and anti - vibration. The structure is compact, and the height is low, which is convenient for transportation and installation in mine roadways.

　　Complete Protection Functions: It has multiple protection functions such as overload, short - circuit, leakage, over - voltage, under - voltage, and over - temperature, and is also equipped with an RS485 interface for computer communication to realize remote monitoring and control.

　　Application Scope

　　It is mainly used in coal mines, non - ferrous metal mines, and tunnel projects filled with methane mixtures, coal dust, and other explosive gas environments, as the power supply device for comprehensive coal mining machines, transportation machines, pump stations, fans, and other equipment.