Title:
漏洩電流を検出する漏洩電流検出装置、方法およびプログラム
Document Type and Number:
Japanese Patent JP7346794
Kind Code:
B2
Abstract:
Included are: a leakage current detector 11 which detects a leakage current flowing through an electric line to be measured in a three-phase four-wire system in which three phases are star-connected, a neutral point is grounded, and a grounding wire is lead out; a voltage detector 12 which detects a voltage applied between any two of the three phases in the electric line to be measured; a phase difference detector 13 which detects a phase difference based on the leakage current and the voltage detected by the voltage detector 12; a resistive component leakage current calculator 14 which calculates a resistive component leakage current which is attributed to a ground insulation resistance and contained in the leakage current flowing through the electric line to be measured based on the phase difference and the leakage current; and a determination processor 15 which determines whether or not the phase difference is within a predetermined range and if the phase difference is determined not to be within the predetermined range, transmits the phase difference detected by the phase difference detector 13 to the voltage detector 12. The voltage detector 12 switches the phases between which the voltage of the electric line to be measured has been detected to another two phases based on the phase difference to detect a voltage applied between the other two phases switched to.
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Inventors:
Head book request number
Application Number:
JP2022126095A
Publication Date:
September 20, 2023
Filing Date:
August 08, 2022
Export Citation:
Assignee:
Head book request number
International Classes:
G01R31/52; H02H3/353
Domestic Patent References:
| JP201564265A | ||||
| JP201670877A | ||||
| JP2008309681A |
Attorney, Agent or Firm:
Naoki Maekawa