Title:
ARC FAILURE DETECTION DEVICE
Document Type and Number:
Japanese Patent JP2017190996
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an arc failure detection device capable of performing highly accurate detection by reducing an influence due to a switching noise of an inverter in a PCS(Power Conditioner System) regardless of a configuration of a photovoltaic power generation system or an occurrence position of an arc.SOLUTION: The arc failure detection device comprises: a current sensor 221 provided between a breaker 210 for opening/closing a DC circuit and a DC bus line 300, which detects currents of a DC circuit 201; a frequency analysis part 223 which calculates a frequency spectrum of a specific frequency component of the currents detected by the current sensor 221; a logarithmic arithmetic processing part 224 which performs a logarithmic operation for each frequency of the frequency spectrum; a total sum value arithmetic part 225 which calculates a total sum value of the logarithmic arithmetic values; and an arc failure determination processing part 229 which determines the presence/absence of an arc failure in the DC circuit 201 on the basis of the scale of the total sum value and a predetermined threshold, and performs the opening of the breaker 210 and alarm output.SELECTED DRAWING: Figure 2
Inventors:
YAMAUCHI YOSHINORI
ONCHI TOSHIYUKI
ONCHI TOSHIYUKI
Application Number:
JP2016080139A
Publication Date:
October 19, 2017
Filing Date:
April 13, 2016
Export Citation:
Assignee:
FUJI ELECTRIC FA COMPONENTS & SYSTEMS CO LTD
International Classes:
G01R31/02; H02S50/00
Domestic Patent References:
| JP2015145847A | 2015-08-13 | |||
| JP2012112937A | 2012-06-14 | |||
| JPH06308192A | 1994-11-04 | |||
| JP2000111604A | 2000-04-21 | |||
| JP2008268083A | 2008-11-06 |
Foreign References:
| US20110141644A1 | 2011-06-16 |
Attorney, Agent or Firm:
Yuichi Morita