INTELLIGENT ZERO HARMONIC FILTER BUILT-IN RELAY

摘要

The present invention relates to an image harmonic filter. An image harmonic filter according to a preferred embodiment of the present invention is electrically connected to an R phase busbar, an S phase busbar, a T phase busbar, and an N phase busbar. The image harmonics filter eliminates image harmonics by circulating image harmonics internally. Zigzag wiring transformer; A switching unit located on a line connecting the zigzag wiring transformer, the R phase busbar, the S phase busbar and the T phase busbar, respectively; And a current image on the N-phase bus bar is scanned for a day each time the predetermined time elapses to calculate an image minute average value for each time period, and the calculated average value of the image minute from the calculated time minute average value Wherein the zigzag wiring transformer is electrically disconnected from the R phase busbar, the S phase busbar, and the T phase busbar at a time when the average value of the image minute is less than or equal to a predetermined lower limit of the video image, A control module for connecting the zigzag wiring transformer to the R-phase busbar, the S-phase busbar and the T-phase busbar in a time zone exceeding a predetermined time, wherein the control module updates a time- And using the updated image minute average value for the day during the predetermined period of time And connecting or disconnecting the zigzag wiring transformer to the R-phase busbar, the S-phase busbar, and the T-phase busbar.