System and process of localization of land faults in windings deexcitation of synchronous machines with static excitation (Machine-translation by Google Translate, not legally binding)

摘要

System and process for locating ground faults in excitation windings of synchronous machines with static excitation. It is a system and method of locating faults to ground whose excitation transformer has the neutral accessible. It has the advantage that it saves a lot of time when it comes to repair the machine in case of ground fault of the excitation winding, since it locates the defect with the machine in operation, allowing to know at the moment of disconnection of the machine from the network the place of the defect. The system comprises: - a grounding resistor (4) in the transformer (1) feeding the rectifier (2); - a measuring device (6) of the voltage falling on the earthing resistor (4); - a measuring device (7) of the rotor supply voltage, - an analyzer device (13) responsible for analyzing the measured signals and which has: - means for obtaining the components of alternating and continuous voltage (8) of the waves measured by the equipment 6 and 7; - calculating means (9) and (10) responsible for obtaining the values necessary to draw the line that relates the position of the defect with the level of dc voltage measured in the earthing resistance (4); - means for obtaining the line "vdc-defect position" (11) from which the position of the short-circuit in the winding is determined, returning the corresponding signal (12). (Machine-translation by Google Translate, not legally binding)