Abstract: A power distribution network monitoring system includes a plurality of measuring instruments that are installed at predetermined positions on power lines constituting a power distribution network and configured to perform electrical measurement of the power lines; a data collection relay configured to receive data related to measurement results from the plurality of measuring instruments; an imaging unit that is disposed near the data collection relay and configured to capture an image including the data collection relay; an abnormality detector configured to use the image captured by the imaging unit to detect an abnormality in the data collection relay; and a storage unit configured to store image data taken by the imaging unit. The image data consists of a single image previously captured by the imaging unit.

Abstract: A power distribution network monitoring system detects abnormalities that occur in a power distribution network using measuring instruments installed in the power distribution network. The power distribution network monitoring system includes a plurality of measuring instruments that are installed at predetermined positions on power lines on an upstream side of the downmost-stream power demander, among the power lines constituting the power distribution network and configured to perform electrical measurement of the power lines; and an abnormality detector configured to determine whether or not data related to the measurement result measured by the measuring instrument has been received a predetermined number of times within a predetermined length of time, and detect the abnormality.

Abstract: A power distribution network monitoring system detects abnormalities that occur in a power distribution network using measuring instruments installed in the power distribution network. The power distribution network monitoring system includes a plurality of measuring instruments that are installed at predetermined positions on power lines on an upstream side of the downmost-stream power demander, among the power lines constituting the power distribution network and configured to perform electrical measurement of the power lines; and an abnormality detector configured to determine whether or not data related to the measurement result measured by the measuring instrument has been received a predetermined number of times within a predetermined length of time, and detect the abnormality.

Abstract: A power distribution network monitoring system, comprising: a plurality of measuring instruments that are installed at predetermined positions on the power lines constituting a power distribution network and configured to perform electrical measurement of the power lines; a data collection relay configured to receive data related to measurement results from the plurality of measuring instruments; an imaging unit that is disposed near the data collection relay and configured to capture an image including the data collection relay; and an abnormality detector configured to use the image captured by the imaging unit to detect an abnormality in the data collection relay.

Abstract: A pushbutton device has a button section that is movable along a predetermined direction, and having a first member located on an opposite side to a depression side, a support section that movably supports the button section along the predetermined direction, a plurality of first magnets opposed to the first member by the support section, the plurality of first magnets being fixed so as to surround a center of the button section, the plurality of first magnets having a first magnetic pole on a side opposed to the first member, and a plurality of second magnets arranged at a position farther away from the center of the button section by a predetermined distance than each of the plurality of first magnets or at a position closer to the center of the button section by the predetermined distance than the first magnet.