Title:
GROUND FAULT PROTECTOR, AND ITS OPERATING METHOD, AND SUNLIGHT POWER GENERATION SYSTEM HAVING THIS, AND INVERTER FOR SUNLIGHT POWER GENERATION SYSTEM
Document Type and Number:
Japanese Patent JP3565470
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent unnecessary stoppage of a sunlight power generation system by providing a means which outputs a gate block signal to a gate block means, and a break command signal to a mechanical breaking means to load, individually, when a ground fault occurs inside a solar cell array.
SOLUTION: A detection means 1 and a first continuance confirmation means 2 output a gate block signal from a gate block signal production means 3 to a gate block means when they detect the ground fault occurring continuously for a first specified period. Then, when a ground fault is detected again in the detection means 1 and the second continuance confirmation means 4 after the passage of the second period longer than the first period, a break command signal is given to a mechanical breaking means from a break signal production means 5, judging that it is faulty. When the ground is not detected once again, the gate block signal is canceled. As a result, malfunctions decrease, and high reliability can be obtained even in a long time operation.
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Inventors:
Nobuyoshi Takehara
Application Number:
JP15674597A
Publication Date:
September 15, 2004
Filing Date:
June 13, 1997
Export Citation:
Assignee:
Canon Inc
International Classes:
H01L31/04; H02H3/16; H02H7/122; H02J3/38; H02J7/35; H02M7/48; (IPC1-7): H02H7/122; H02H3/16; H02J7/35; H02M7/48
Domestic Patent References:
| JP5328609A | ||||
| JP62092719A | ||||
| JP58165622A |
Attorney, Agent or Firm:
Hisao Fukumori
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