Title:
漏電継電器、漏電遮断器及びそれらの制御方法
Document Type and Number:
Japanese Patent JP6573571
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a leakage relay or the like capable of preventing a malfunction of the leakage relay in more simplified configuration and more reliably compared to the prior arts.SOLUTION: A leakage relay issues a warning by determining the presence/absence of leakage in a cable run from whether an effective value of a secondary voltage waveform of a zero-phase-sequence current transformer provided in a three-phase cable run exceeds a predetermined value. The leakage relay comprises determination means for obtaining a tertiary harmonic component of the secondary voltage waveform of the zero-phase-sequence current transformer and determining whether the tertiary harmonic component value exceeds a predetermined threshold value. When the tertiary harmonic component value exceeds the threshold value, a warning function of the leakage relay is stopped. The determination means also calculates a current value flowing in the three-phase cable run from the tertiary harmonic component value and outputs the current value.SELECTED DRAWING: Figure 1
Inventors:
Yoshimasa Watanabe
Yasuyuki Okada
Akihide Shiratsuki
Yasuyuki Okada
Akihide Shiratsuki
Application Number:
JP2016086944A
Publication Date:
September 11, 2019
Filing Date:
April 25, 2016
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H02H3/16; G01R31/02; H01H83/02; H02H3/34; H02H3/347
Domestic Patent References:
| JP2011250486A | ||||
| JP50141146U | ||||
| JP1153977A | ||||
| JP4372519A | ||||
| JP10285788A |
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Haruo Nakano
Mitsuo Tanaka
Haruo Nakano