Patent ID: 7724152
Filing Date: 2010-05-25
Classification: H01F,H01H,H02P

Abstract:
1. A tap change operation monitoring apparatus for an on-load tap changer, said tap change operation monitoring apparatus comprising: torque sensing means for detecting drive shaft torque exerted on a drive shaft of an operating mechanism for operating said on-load tap changer which is provided with a diverter switch, a tap selector and a changeover selector; operating mode discrimination means for discriminating operating mode in which said on-load tap changer performs tap change operation; torque waveform data recording means for recording torque waveform data concerning said drive shaft torque detected by said torque sensing means for each operating mode discriminated by said operating mode discrimination means; reference data setup means for setting monitoring target specification data for each operating mode of said on-load tap changer and then setting and storing a reference value of said monitoring target specification data and a management value of a permissible variable range thereof; waveform processing means including: specification data extraction means for extracting data corresponding to said monitoring target specification data as specification data from the reference operating time extracted by said waveform processing means and said processed torque waveform data; and anomaly judgment means for comparing the specification data extracted by said specification data extraction means with the reference value set by said reference data setup means and judging that an anomaly has occurred if the result of comparison exceeds the management value of said permissible variable range.