MONITORING OF OPERATIONAL STATUS OF APPLIANCES

摘要

The invention relates to a method for identifying the status of appliances connected to an electrical installation, for example a status indicating whether the appliance is ON or OFF. The identification is obtained by measuring one or more electrical values from the electrical installation such as voltages, power and current in various forms. The measured values are compared with previously obtained appliance signatures in order to obtain a match with one of the signatures. A positive match is used to set a status of one of the appliances. A status may be the current power consumption or the power consumption may be determined subsequently from the status. Since appliance signatures may depend on the supply voltage, a signature may contain a plurality of supply voltages and an electrical parameter, e.g. power consumption, for each of the voltages. The signatures may be obtained during a training process where the voltage supplied to the appliance is varied in a controlled way.