Title:
METHOD FOR DIAGNOSING SOUNDNESS OF ZERO-PHASE CURRENT TRANSFORMER AND POWER CONDITIONER
Document Type and Number:
Japanese Patent JP2020046261
Kind Code:
A
Abstract:
To provide such a method for diagnosing the soundness of a zero-phase current transformer that allows detecting not only broken wire in a coil but also a fault due to aging degradation, in a zero-phase current transformer, and a power conditioner provided with a function with which it is possible to perform such a soundness diagnosis.SOLUTION: The method for diagnosing the soundness of a zero-phase current transformer includes: steps 136 and 148 for measuring a first measured current value by a zero-phase current transformer when a current of known first current value is sent to a wire inserted in the zero-phase current transformer and a second measured current value by the zero-phase current transformer when a current of known second current value, different from the first current value, is sent to the wire; and steps 138 and 150 for determining whether the zero-phase current transformer is sound in accordance with whether or not an absolute value of a difference between the first current value and the first measured current value is within a first threshold and whether or not an absolute value of a difference between the second current value and the second measured current value is within a second threshold.SELECTED DRAWING: Figure 4
Inventors:
TAKESHITA KOICHI
UDONO NAOTADA
AYAI NAOKI
UDONO NAOTADA
AYAI NAOKI
Application Number:
JP2018173906A
Publication Date:
March 26, 2020
Filing Date:
September 18, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
G01R31/50; G01R35/00; H01F38/32; H02J3/38; H02M7/48
Domestic Patent References:
| JP2016099192A | 2016-05-30 | |||
| JP2018013374A | 2018-01-25 | |||
| JPH0627165A | 1994-02-04 | |||
| JP2015220879A | 2015-12-07 | |||
| JP2003018740A | 2003-01-17 | |||
| JP2012205328A | 2012-10-22 |
Attorney, Agent or Firm:
Satoshi Shimizu
Tetsuji Kamidai
Naomi Kamino
Tetsuji Kamidai
Naomi Kamino