Title:
DEVICE FOR PROTECTION FROM THUNDER
Document Type and Number:
WIPO Patent Application WO/2004/054062
Kind Code:
A1
Abstract:
It is possible to prevent switching of a thunder detection circuit to the normal state by judging that no thunder is approaching because the thunder detection circuit is initialized by power supply stop during a thunder approaching continuation period. A device for protection from thunder includes a thunder detection circuit for judging whether thunder approach is present by detecting a thunder signal and an open/close mechanism for switching between the normal state for connecting a device to be protected to the electric path and the thunder-resistant state for disconnecting the device to be protected from the electric path. Control power supply is obtained from the electric path. When the signal from the thunder detection circuit indicates that no thunder is approaching, the normal state is set in and when the signal indicates that thunder is approaching, the thunder-resistant state is set in by the open/close mechanism. When the control power supply stops, after the control power supply is recovered, the presence/absence of thunder approach is checked for a predetermined period of time. If the thunder approach is present, the thunder-resistant state is set in and if no thunder is approaching, the normal state is set in.
Inventors:
NAKATA RYOSAKU (JP)
Application Number:
PCT/JP2003/014546
Publication Date:
June 24, 2004
Filing Date:
November 14, 2003
Export Citation:
Assignee:
NIPPON KOUATSU ELECTRIC CO LTD (JP)
NAKATA RYOSAKU (JP)
NAKATA RYOSAKU (JP)
International Classes:
G01W1/16; H02H3/22; H02H5/00; (IPC1-7): H02H3/22; G01W1/16; H02H9/04
Foreign References:
| JPH07298476A | 1995-11-10 | |||
| JP2000076984A | 2000-03-14 |
Attorney, Agent or Firm:
Kojima, Seiji (7-26 Jingu 3-chome, Atsuta-k, Nagoya-shi Aichi, JP)
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