Patent ID: 8560263
Filing Date: 2013-10-15
Classification: H02J,Y02E,Y04S

Abstract:
1. An estimation device that estimates a positional relationship between a plurality of loads in a power distribution network, the estimation device comprising: a communication circuitry configured to change a resistance value and measure a voltage value by communicating with a plurality of sensors, the loads being individually connected through the plurality of sensors to a plurality of electric power-supply ends provided in the power distribution network, the resistance value being located between each of the electric power-supply ends and a ground terminal of each of the plurality of sensors, the voltage value being produced between each of the electric power-supply ends and the ground terminal; and a processor coupled to the communication circuitry, the processor being configured to: select two sensors from among the plurality of sensors connected to the power distribution network, acquire voltage values from the two selected sensors through the communication circuitry, acquire voltage values from the two selected sensors after a resistance value of one of the two sensors that has a higher acquired voltage value is changed, calculate, with respect to each of the two sensors, a ratio between voltage values acquired before and after the resistance value is changed, and determine that the two sensors are connected to a branch circuit in a same system in the power distribution network, when the ratio is within a specified range with respect to each of the two sensors.