Arc detection device, breaker, power conditioner, solar panel, solar-panel-attached module, junction box, arc detection system, and arc detection method

An arc detection device that detects an arc fault that occurs in a transmission line connecting a DC power supply that generates DC power and a power converter that converts the DC power to AC power, the arc detection device comprising:

• a first determination unit configured to determine whether or not there is a possibility of an arc fault occurrence according to current flowing in the transmission line;
• a shutoff unit configured to temporarily stop flow of current in the transmission line when the first determination unit determines there is a possibility of an arc fault occurrence;
• and
• a second determination unit configured to determine whether or not an arc fault has occurred according to an input voltage, of the power converter supplied from the DC power supply, after lifting temporary stoppage of the flow of current in the transmission line, wherein
• the first determination unit is configured to perform a frequency analysis of current flowing in the transmission line and determine there is a possibility of an arc fault occurrence when the current includes a component in a specific frequency band, and
• the second determination unit is configured to determine that an arc fault has occurred when the input voltage after lifting temporary stoppage of the flow of current in the transmission line is less than a predetermined value.