Method for determining quality indices for the electrical power supplied by a three-phase network and devices for implementing the method

摘要

The device determines the symmetrical components of the electrical power supply and evaluates the quality indices from these components. The device consists of three adders 14, 15, 16 some of whose inputs are used as input terminals for the device, and whose outputs are connected electrically to the corresponding inputs of the unit 20 for measuring the symmetrical components of the voltages in the three-phase network. It also comprises a controlled three-phase voltage generator 17. The output from a shaper 18 is connected to the synchronisation input of the three-phase voltage generator 17 and its input is connected to one of the input terminals of the device. Used with most success in measurement systems incorporating a computer. <IMAGE>