Title:
METHOD AND DEVICE FOR HANDLING DIRECT CURRENT ARC
Document Type and Number:
WIPO Patent Application WO/2019/127440
Kind Code:
A1
Abstract:
A method and device for handling a direct current arc. The method may comprise: acquiring a first current (801), the first current being a direct current input current of a direct current cable connected to a photovoltaic battery system; acquiring a second current (802), the second current being a direct current common-mode current of the direct current cable or an alternating current common-mode current of an alternating current cable; calculating a correlation coefficient between the frequency-domain component of the first current and the frequency-domain component of the second current (803); and when the first current is determined as meeting an arc existence condition and the correlation coefficient as being greater than or equal to a preset coefficient threshold, refraining from issuing a direct current arc fault warning (805). The method and device reflect via the correlation coefficient the proportion of a common-mode noise generated by the second current and set the preset coefficient threshold, if the correlation coefficient is greater than the coefficient threshold, then it means that the condition for arc existence met by the first current is generated due to a great common-mode noise, and under such premises, no alarm needs to be issued, thus reducing interference of the normal operation of an inverter, and increasing product performance.
More Like This:
| JPH01126127 | BREAKER TRIPPING CONTROL CIRCUIT FOR PROTECTIVE RELAY |
| JPS51122739 | SYSTEM FOR GROUNDING DISCONNECTION DETECTION IMPEDANCE |
| JPS6082019 | PROTECTING RELAY |
Inventors:
LIU FANGCHENG (CN)
XIN KAI (CN)
LIU YUNFENG (CN)
XIN KAI (CN)
LIU YUNFENG (CN)
Application Number:
PCT/CN2017/120040
Publication Date:
July 04, 2019
Filing Date:
December 29, 2017
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H02H3/00; G01R31/00
Foreign References:
| CN102253293A | 2011-11-23 | |||
| CN103913663A | 2014-07-09 | |||
| CN104730433A | 2015-06-24 | |||
| EP1796238A2 | 2007-06-13 |
Other References:
See also references of EP 3723218A4
Attorney, Agent or Firm:
SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)
Download PDF:
Previous Patent: CALCULATOR OPERATION METHOD AND TERMINAL
Next Patent: METHOD FOR SELECTING EMULATED CARD, AND MOBILE DEVICE
Next Patent: METHOD FOR SELECTING EMULATED CARD, AND MOBILE DEVICE