Patent ID: 7218122
Filing Date: 2007-05-15
Classification: G01R

Abstract:
1. An apparatus for selectively generating a disturbance in a three-phase supply voltage provided to a load, the apparatus comprising: input connections for connecting to and receiving a first phase voltage, a second phase voltage and a third phase voltage of the three-phase supply voltage; a voltage disturbance generator for receiving the first, second and third phase voltages from the input connections and for selectively adjusting the amplitudes of one or more of the first, second and third phase voltages according to any one of a first test method, a second test method and a third test method, the voltage disturbance generator comprising: output connections for connecting to the load and providing to the load the first, second and third phase voltages as altered by the voltage disturbance generator, where the apparatus provides for selecting any one of the first means, second means and third means without disconnecting any of the first, second and third phase voltages from the input connections, without disconnecting the load from any of the output connections, and without interrupting the load.