Patent ID: 7929322
Filing Date: 2011-04-19
Classification: G01R,Y02B,Y04S

Abstract:
1. A device for generating voltage sags on an electrical generator machine connected to an electrical network, comprising: a) between one and three transformers arranged in parallel and connected on one side to the electrical generator machine by means of a coupling switch and circuit breakers associated with each of the transformers respectively, and which are connected on the other side to ground by means of circuit breakers associated with each of the transformers respectively and a control switch; b) mechanisms for generating short circuits by activating the coupling switch and the control switch in a manner which controls their aperture and closure time instances in order to generate a voltage sag of a duration in line with that required, and by activating the circuit breakers in order to select a number of transformers involved in generating the voltage sag, when there is more than one transformer, and to select a single phase, two phase, or three phase type of the sag; and c) mechanisms for protecting the transformers during voltage sag generation.