SOLAR LIGHT POWER GENERATION SYSTEM

Japanese Patent JP3804276

B2

PROBLEM TO BE SOLVED: To provide a solar light power generation system which has constant detection level for a grounding in a DC cableway and thereby can prevent erroneous detection of a ground.
SOLUTION: A distributed power supply equipment 2 converts a DC voltage from a solar battery 1 to specified AC voltage and then supplies power to a load 4 in linkage with a commercial power system 3. A DC cableway for connecting the solar battery 1, and the distributed power supply 2 is passed through a through-hole 12 formed in a detection core 11 of a zero-phase current transformer 10. A ground detection circuit 9 detects the ground current in a DC cableway 21 from the output of a secondary winding wound around the detection core 11. When the ground detection circuit 9 detects a ground, a control circuit 8 stops the generation of power by the distributed power supply 2, based on the detection signal of the ground detection circuit 9. After that, when the distributed power supply 2 restarts power generation, a demagnetizing circuit 15 causes damped oscillating current to flow into the DC cableway 21 and passing through the through-hole 12 of the detection core 11 to eliminate the residual magnetism of the detection core 11.

Kiyoshi Goto
Yoichi Kunimoto
Hiroaki Koshin
Tadayoshi Mukai
Hirotada Higashihama
Hiroaki Yuasa

JP18510498A

August 02, 2006

June 30, 1998

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MATSUSHITA ELECTRIC WORKS,LTD.

G01R31/02; H02J3/38; (IPC1-7): H02J3/38; G01R31/02

JP9084254A
JP9243697A
JP8126338A

Keisei Nishikawa
Atsuo Mori

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