Low-voltage testing device for high-voltage frequency converter of serial superposition voltage type

摘要

The utility model provides a low-voltage testing device for a high-voltage frequency converter of a serial superposition voltage type constituted by a tap transformer, a power portion, a monitoring box, an analog interface board, a voltage detecting portion and a remote control portion, in which the tap transformer is connected to the power portion, the power portion is connected to the voltage detecting portion, the monitoring box is connected to the power portion via an optical fiber and the analog interface board is connected to the monitoring box and the remote control portion respectively. The power portion is divided into three groups, each group being one phase and six power units being connected in series in each phase. The monitoring box includes a PWM unit, a double-DSP unit and an interface circuit, in which the PWM unit is connected to a FPGA and a CPLD unit and the double-DSP unit is connected to the interface circuit. An AVR control board is connected to an operation panel. The utility model implements small size and convenient operation. After practical checking, the design scheme of low-voltage testing on the high-voltage frequency converter proposed in the utility model enables reliable performance and long term operating, and thus has a wide application prospect in a market.