Title:
電子式回路遮断器
Document Type and Number:
Japanese Patent JP6930664
Kind Code:
B2
Abstract:
This electronic circuit breaker is provided with: a current transformer 3 for detecting current flowing through an AC electric path 1; a rectifier circuit 4 connected to the secondary side of the current transformer 3 and rectifying the detected current; a power supply circuit 5 connected to the output side of the rectifier circuit 4 and outputting a constant voltage; and a microcomputer 10 for detecting the detected current at a predetermined detection cycle, calculating an accumulated current value which is obtained by accumulating the product of the square value of the effective value of the detected current in a period during which the detected current exceeds a predetermined value corresponding to a rated current and the detection cycle, and opening a switching contact 2 on the basis of the accumulated current value. The electronic circuit breaker has an OFF-time measuring circuit 20 connected to the microcomputer 10 and measuring an OFF-time that is time during which the output voltage of the power supply circuit 5 has been less than the operational voltage of the microcomputer 10. The microcomputer 10 determines the initial value of the accumulated current value on the basis of the OFF-time read from the OFF-time measuring circuit 20 during startup, the ON-current corresponding to energization current in an intermittent load, and the ON-time corresponding to energization time in the intermittent load.
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Inventors:
Yusuke Takigawa
Toshimitsu Nomura
Yuuki Harada
Kiyoshi Kiyoshi
Toshimitsu Nomura
Yuuki Harada
Kiyoshi Kiyoshi
Application Number:
JP2020525307A
Publication Date:
September 01, 2021
Filing Date:
April 22, 2019
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H02H3/093
Domestic Patent References:
| JP2010093946A | ||||
| JP2009170338A | ||||
| JP2001128354A | ||||
| JP8223777A | ||||
| JP2001016759A |
Attorney, Agent or Firm:
Kanako Murakami
Shigeaki Matsui
Kuratani Yasutaka
Shigeaki Matsui
Kuratani Yasutaka