Patent ID: 8994388
Filing Date: 2015-03-31
Classification: G01R

Abstract:
1. A low-voltage testing device for a high-voltage frequency converter of a serial superposition voltage type, comprising: a tap transformer; a power portion connected to the tap transformer, the power portion being divided into three groups, the individual groups comprising a plurality of power boards superposed in series; a monitoring box connected to the power portion via an optical fiber and comprising a main controller of the high-voltage frequency converter; an analog interface board connected to the monitoring box; a voltage detecting portion connected to the power portion; and a remote control portion connected to the analog interface board and comprising: wherein the monitoring box receives operation commands including the analog signal, control commands and digital signals from the remote control portion and provides pulse width modulation (PWM) control signals to the power boards according to the operation commands and the analog signal to perform real time rectification and inversion control and detection on each power board through the optical fiber, operating control, status analysis and fault diagnosis at least partially according to the analog signal, control commands and digital signals from the remote control portion for test operation of one or more of the power boards; wherein the monitoring box provides fault signals to the remote control portion based on the status analysis and fault diagnosis; and wherein the remote control portion receives the fault signals from the monitoring box to perform low-voltage testing by providing the frequency and control signals to simulate on-load final test and software test.