Power supply system for variable-frequency winch

Abstract

The invention provides a power supply system for a variable-frequency winch. The power supply system comprises a feed power supply, and a main motor, a frequency converter, a main motor blower fan and a hydraulic oil pump for operation of the variable-frequency winch. The feed power supply connects and supplies power to a frequency converter. An output end of the frequency converter is connected with the main motor. The frequency converter comprises a transformer. An output end of the transformer is connected with an input end of an illumination comprehensive protection device. The transformer reduces voltage of the feed power supply and applies reduced voltage to the working power supply of the illumination comprehensive protection device. An output end of the illumination comprehensive protection device is connected with a PLC control cabinet. The PLC control cabinet controls the main motor, the main motor blower fan and the hydraulic oil pump respectively. The transformer reduces voltage of the hydraulic oil pump, the main motor and the main motor blower fan to 660V, so that the voltage class is lowered, the requirement for motor insulation is lowered, and the service life of a motor is prolonged. In addition, the transformer serves a function of isolating voltage fluctuation of an electrical network, so that an operation power supply of the main motor is enabled to be more stable.

Description

technical field [0001] The invention relates to the technical field of frequency conversion winch, in particular to a power supply system of frequency conversion winch. Background technique [0002] In the mine hoisting system, frequency conversion winches are used more and more frequently in inclined roadways, and the power and voltage levels of frequency conversion winches are getting larger and larger. At present, frequency conversion winches with a power of 355KW and a voltage of 1140V have been generally used as lifts for inclined roadways. material transportation. When the frequency converter of the variable frequency winch is started, the voltage harmonics generated by the influence of the frequency converter are also relatively obvious, causing an impact on the power supply system. Since the power components are very sensitive to factors such as energizing current, resonant current, and heat dissipation efficiency, although the front and rear ends of the inverter ar...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of high frequency and short time of high-order resonance, and the protection device often cannot completely absorb or take no time to make a protection action, the peak value of the residual resonance current is much larger than the current range of the motor, resulting in residual current feedback and burning out small power Motor, switch JDB, circuit board, etc.

Similarly, when hydraulic station motors and fan motors fail, harmonics will be fed back to the frequency conversion electronic control system, which will have some impact on power components

Therefore, high-frequency resonance caused by voltage fluctuations is the main cause of damage to motors and components

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