Omron Corporation

Kosuke Morita

Shuichi Misumi

Akihiko Sano

Tsuyoshi Takeuchi

Yuji Tsurukawa

A solar photovoltaic system inspection apparatus sequentially applies AC inspection signals to a positive electrode and a negative electrode of a solar cell string, and is provided with: an impedance calculation unit configured to measure an indicator value when the signal is applied to the positive electrode, and an indicator value when the signal is applied to the negative electrode, the indicator values varying depending on the number of solar cell modules from the terminal to which the inspection signal was applied to a failure position; and a control unit configured to obtain the failure position based on the ratio of the indicator value measured when the inspection signal was applied to the positive electrode, to the indicator value measured when the inspection signal was applied to the negative electrode.

Solar photovoltaic system inspection method and inspection apparatus

When a ground fault detection device detects a ground fault of a photovoltaic string, for example, while a power conditioner is in operation, a great current may be flowing in a switching section from the photovoltaic string, so that components resistant to a great current have been used for the switching section. A ground fault detection device includes a stop determination unit configured to determine whether a power converter for converting electric power from a solar battery is in stoppage, and a ground fault detector configured to detect a ground fault of the solar battery in a state where the solar battery and the power converter are electrically disconnected from each other by a disconnection unit arranged between the solar battery and the power converter when the stop determination unit determines that the power converter is in stoppage.

Growing community of inventors

Tokorozawa, Japan

Kosuke Morita