Title:
直流遮断器
Document Type and Number:
Japanese Patent JP7015766
Kind Code:
B2
Abstract:
To suppress generation of arc discharge in a sub fuse and make a low-voltage sub fuse available.SOLUTION: A terminal T1 and a terminal T2 are applied with a high-voltage direct current of 380 V. A terminal T3 and a terminal T4 are connected with a load. When a short circuit accident or the like occurs and an excessive current flows, a main fuse MF is molten and cut firstly. At this time, a voltage of the terminal T3 is maintained at 380 V by a voltage of a capacitor C2 included in a main fuse arc suppression circuit 20. Therefore, even when the main fuse MF is molten and cut, no arc discharge is generated. Next, when a current flowing in a sub fuse SF increases and the sub fuse SF is molten and cut, a voltage of a capacitor C1 included in a sub fuse arc suppression circuit 10 becomes sufficiently low. Since a current flowing in a resistor R1 is applied to the capacitor C1 through a diode D2, a rapid rise in voltage at one end C of the sub fuse SF is suppressed, and no arc discharge is generated at the sub fuse SF.SELECTED DRAWING: Figure 1
Inventors:
Shoji Haneda
Application Number:
JP2018179619A
Publication Date:
February 03, 2022
Filing Date:
September 26, 2018
Export Citation:
Assignee:
ntn corporation
International Classes:
H01H33/59; H01H85/02
Domestic Patent References:
| JP2009181864A | ||||
| JP2014179189A | ||||
| JP2011222414A |
Foreign References:
| WO2018146942A1 |
Attorney, Agent or Firm:
Takashiro Kojima
Noriko Kawai
Toshihiro Minami
Noriko Kawai
Toshihiro Minami
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