Title:
変圧器鉄心の直流偏磁検出方法および変圧器鉄心の直流偏磁検出システム
Document Type and Number:
Japanese Patent JP6642230
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately and safely detect DC-biased magnetization occurring in a core of a transformer.SOLUTION: A primary coil 12 is wound around a core 11 and inputs AC power. A secondary coil 13 is wound around the core 11 and steps up or steps down an AC voltage inputted by the primary coil 12 in accordance with a winding ratio of the primary coil 12 and the secondary coil 13. A vibration displacement derivation part 31 successively acquires electric signals representing vibrations of the core 11 from a vibration sensor 20 and derives a vibration displacement waveform of the core 11 caused by a magnetic distortion phenomenon. A magnetization derivation part 32 performs temporal integration of a primary voltage (a voltage between input terminals 18) of a transformer 10 and derives a magnetization waveform based on a value of the temporal integration. Based on the vibration displacement waveform derived by the vibration displacement derivation part 31 and the magnetization waveform derived by the magnetization derivation part 32, a magnetization amount/biased magnetization direction derivation part 33 derives the amount and the direction (polarity) of DC-biased magnetization occurring in the core 11.SELECTED DRAWING: Figure 1
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Inventors:
Masato Mizogami
Application Number:
JP2016083051A
Publication Date:
February 05, 2020
Filing Date:
April 18, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
G01R33/12; G01R33/02; H01F27/00; H01F41/00
Domestic Patent References:
| JP7211565A | ||||
| JP2001161024A | ||||
| JP11162769A | ||||
| JP2014150598A |
Foreign References:
| CN102520373A |
Attorney, Agent or Firm:
Takayoshi Kokubun