Anti-overvoltage protection device of coal mill separator frequency converter

Abstract

The invention discloses an anti-overvoltage protection device of a coal mill separator frequency converter. The device comprises a device base, a water suction hole, a draught fan and a connecting opening; a ventilation opening is formed in the upper side of a device shell; a filter screen is installed in the ventilation opening; a damp-proof box is arranged on the upper surface of the interior ofthe device shell; the water suction hole is formed in the surface of the damp-proof box; the damp-proof box is installed above a circuit element; the draught fan is fixed below the circuit element; the draught fan is fixed to the bottom face of the interior of the device shell; the connecting opening is formed in the outer side face of the device shell. The anti-overvoltage protection device of the coal mill separator frequency converter is provided with a resistance box; the direct-current bus output terminals of the frequency converter connect two 6-square-meter wires to the wiring terminals of the resistance box, and then parts of parameters are changed, so that mis-tripping of the separator frequency converter caused by wind speed change in a cylinder body is prevented, the safe operation of a coal mill is guaranteed, and the safe and stable operation of a generator set is facilitated.

Description

technical field [0001] The invention relates to the technical field of operation and maintenance of a frequency converter of a coal mill separator, in particular to an overvoltage protection device for a frequency converter of a coal mill separator. Background technique [0002] The 12 coal mill separator inverters in Anyuan Power Plant use Rockwell 753 series, with a motor power of 45 kilowatts. During operation, the inverter often has the phenomenon of DC bus overvoltage tripping, and it can run for a period of time after being reset. Time, sometimes the same inverter will have the same tripping fault several times within a month. After modifying other parameters such as acceleration and deceleration time, the fault of abnormal tripping during operation still cannot be solved. 12 inverters will have such faults. , which seriously affected the safe and stable operation of the coal mill. Consulting with the inverter cabinet manufacturer failed to reply to a better solution, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-overvoltage protection device for the frequency converter of the coal mill separator, so as to solve the problem that the current market frequency converter often trips due to the overvoltage of the DC bus, which affects the coal mill. The normal work of the inverter, and the fixing of the inverter shell is still fixed by bolts, the operation process is troublesome and labor-intensive

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