Mining high-voltage frequency converter with explosion-proof type

Abstract

The invention discloses a mining high-voltage frequency converter with an explosion-proof type. The frequency converter comprises a phase-shifting transformer unit explosion-proof box and a power unit explosion-proof box; a phase-shifting isolation transformer and a heat radiation system are arranged in the phase-shifting transformer unit explosion-proof box; and a plurality of sets of power units, a control unit and a heat radiation system are arranged in the power unit explosion-proof box, wherein the plurality of sets of power units are in series connection. A high-tension side of the phase-shifting isolation transformer is in series connection with a three phase high voltage power network; the plurality of sets of power units are respectively connected with a low tension side of the phase-shifting isolation transformer; and the power units and the control unit are connected by a fiber. According to the invention, all assembling combination surfaces of the phase-shifting transformer unit explosion-proof box and the power unit explosion-proof box are constructed into sealing structures, so that an external environment is isolated from the phase-shifting transformer unit explosion-proof box and the power unit explosion-proof box; therefore, it can be avoided that corresponding chain explosions happen at high-risk occasions including a coal mine and the like and an explosion-proof effect is good. Besides, a control signal is transmitted by a fiber, so that an electrical isolation capability and an anti-electromagnetic interference performance are good.

Description

technical field [0001] The invention relates to a high-voltage frequency converter, in particular to a mine flameproof high-voltage frequency converter. Background technique [0002] At present, in some high-risk occasions, such as coal mines, chemical plants, oil refineries, etc., it is often necessary to use high-power electric motors. However, the power factor of the high-power motor is very low during the starting period, and the voltage fluctuation is obvious, which will cause great harm to the power grid. This type of damage will reduce the operating efficiency of other electrical equipment on the grid and reduce the service life of the equipment; secondly, when the transient voltage occurs, it will cause vibration, noise and excessive heat to the motor. Similarly, the surge generated by the transient will seriously reduce the power consumption efficiency of the grid and increase the current loss of the inductive load. [0003] With the development and automation of ...

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Problems solved by technology

[0005] In view of the above situation, the present invention provides a mine-used flameproof high-voltage frequency converter to solve the problem that the high-voltage frequency converter in the prior art cannot be applied to high-risk places such as coal mines, petroleum, and chemical industries because it does not have the flameproof function.

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