Title:
TRANSFORMER PROTECTION RELAY AND TRANSFORMER PROTECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/057442
Kind Code:
A1
Abstract:
In a transformer protection relay (4), on the basis of whether or not both of a first condition (condition A) that second higher harmonic content percentage contained in a difference current between a primary side and a secondary side of one of phases is greater than a first set value (K1), and a second condition (condition B) that second higher harmonic content percentage contained in a difference current between a primary side and a secondary side of a corresponding phase is greater than a second set value (K2), are satisfied, a determining unit (75) for each phase locks output of a relay computing unit (64) of the corresponding phase. Here, the second set value (K2) is smaller than the first set value (K1).
Inventors:
TAKEMURA SATOSHI (JP)
ODA SHIGETOO (JP)
ODA SHIGETOO (JP)
Application Number:
PCT/JP2022/034406
Publication Date:
March 21, 2024
Filing Date:
September 14, 2022
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02H7/045
Domestic Patent References:
| WO2019043910A1 | 2019-03-07 |
Foreign References:
| JPH07184317A | 1995-07-21 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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