A mine explosion-proof frequency conversion mobile substation

Abstract

The invention discloses a mining flame-proof type frequency conversion mobile substation. The mining flame-proof type frequency conversion mobile substation comprises an iron core, a high-tension coil, a low-tension coil and an auxiliary coil, wherein the low-tension coil is arranged at the outer side of the high-tension coil, and the auxiliary coil is positioned below the low-tension coil; the low-tension coil comprises nine secondary windings; an upper yoke iron and a lower yoke iron of the iron core are bound through a unidirectional binding tape, and a clamp comprises an upper clamp and a lower clamp which are fastened through a pulling plate; and the substation also comprises a flame-proof shell and a flame-proof switch, a metal bellows is arranged on the outer wall of the flame-proof shell, the flame-proof switch is a high-voltage vacuum switch, a base is fixedly connected under the flame-proof shell, and the lower surface of the base is connected with rolling wheels through shafts. Due to the adoption of the technical scheme, the mining flame-proof type frequency conversion mobile substation can be used for realizing the soft start of underground mining equipment and the frequency control in operation and has the advantages of strong capacity of resisting disturbance, good heat dissipation effect and low distortion rate of harmonic currents.

Description

Technical field [0001] The invention belongs to the technical field of mining power equipment, and is particularly suitable for mine explosion-proof type variable frequency mobile substations that provide variable frequency power supplies for belt conveyors and other equipment in mines with methane mixed gas, coal dust and other explosive dangers. Background technique [0002] At present, in mining operations, electric energy has become one of the indispensable technical supports; as we all know, the working environment in mining wells is extremely harsh. Through long-term practice, it has been discovered that mine explosion-proof mobile substations are used for mining The equipment that the motor provides power, the traditional mine explosion-proof mobile substation that provides power frequency power for the motor has the following defects: 1. When the motor is started directly through the power frequency, it will generate 7 to 8 times the rated current of the motor. Greatly in...

AI Technical Summary

Problems solved by technology

[0002] At present, in mining operations, electric energy has become one of the indispensable technical supports; as we all know, the working environment in mining wells is extremely harsh. Through long-term practice, it has been found that mine explosion-proof mobile substation The equipment that provides power to the motor, the traditional mining explosion-proof mobile substation that provides power to the motor with power frequency has the following defects: 1. When the motor is directly started by power frequency, it will generate 7 to 8 times the rated current of the motor, Greatly increase the electrical stress of the motor winding and generate heat, thereby reducing the life of the motor; 2. The traditional electromagnetic speed-adjustable motor drive system has large slip loss, low transmission efficiency, and the maximum output power cannot reach the rated power of the motor. The rate is about 20% lower than that of foreign countries; 3. Some underground equipment, such as belt conveyors, are very difficult to start in conventional ways when the load is heavy, and sometimes they cannot be started at all.

Images