Back to results
US 2017/0324236 A1Published application
Arc detector and arc detection method
AssigneeOMRON Corporation
InventorsKohei TOMITA, Toru FUJII, Reiko HATTORI, Takeshi ASHIDA
Life of this patent
Estimating the term…
Abstract
An arc detector includes a current sensor, a power spectrum conversion unit that converts an output from the current sensor to a power spectrum, a section value obtaining unit that divides an arc measurement section for the power spectrum into a plurality of regions, and obtains, from region values for the plurality of regions excluding a maximum one of the region values, a region value to be a section value of the arc measurement section, and an arc determination unit that determines a presence of an arc by comparing the section value with a threshold.
Claims13
An arc detector, comprising:
- a current sensor configured to detect an output current from a distributed direct-current power supply;
- a power spectrum conversion unit configured to convert the output current from the current sensor to a power spectrum;
- a section value obtaining unit configured to divide an arc measurement section for the power spectrum having a predetermined frequency range into a plurality of regions, and to obtain, from region values determined for the plurality of regions each indicating a magnitude of a power spectrum and excluding a maximum one of the region values, a region value to be a section value of the arc measurement section;
- and
- an arc determination unit configured to determine a presence of an arc based on the section value.
2 more elements
An arc detector, comprising:
- a current sensor configured to detect an output current from a distributed direct-current power supply;
- a power spectrum conversion unit configured to convert the output current from the current sensor to a power spectrum;
- a section value obtaining unit configured to divide an arc measurement section for the power spectrum having a predetermined frequency range into a plurality of regions, to obtain, from region values determined for the plurality of regions each indicating a magnitude of a power spectrum and excluding a maximum one of the region values, a region value to be a section value of the arc measurement section, and to obtain a section value of a noise measurement section for the power spectrum having a frequency range different from the frequency range of the arc measurement section;
- and
- an arc determination unit configured to determine a presence of an arc based on the section value of the arc measurement section and the section value of the noise measurement section.
2 more elements
An arc detection method, comprising:
- detecting an output current from a distributed direct-current power supply;
- converting the output current detected in the current detection step to a power spectrum;
- dividing an arc measurement section for the power spectrum having a predetermined frequency range into a plurality of regions, and obtaining, from region values determined for the plurality of regions each indicating a magnitude of a power spectrum and excluding a maximum one of the region values, a region value to be a section value of the arc measurement section;
- and
- determining a presence of an arc based on the section value obtained in the section value obtaining step.
2 more elements
An arc detection method, comprising:
- detecting an output current from a distributed direct-current power supply;
- converting the output current detected in the current detection step to a power spectrum;
- dividing an arc measurement section for the power spectrum having a predetermined frequency range into a plurality of regions, obtaining, from region values determined for the plurality of regions each indicating a magnitude of a power spectrum and excluding a maximum one of the region values, a region value to be a section value of the arc measurement section, and obtaining a section value of a noise measurement section for the power spectrum having a frequency range different from the frequency range of the arc measurement section;
- and
- determining a presence of an arc based on the section value of the arc measurement section and the section value of the noise measurement section.
2 more elements
Dependencies are inferred from the claim text.