首页>
外国专利>
Detection device for directional detection of ground fault in e.g. insulated neutral balanced three-phase network, has location module including evaluation unit of phase shift between homopolar voltage and homopolar current derivative
Detection device for directional detection of ground fault in e.g. insulated neutral balanced three-phase network, has location module including evaluation unit of phase shift between homopolar voltage and homopolar current derivative
The device has a first module (20) to provide a signal representative of homopolar voltage (V0) of a set of phases. A second module (40) provides a signal representative of derivative with respect to a time of homopolar current (I0). An activation unit activates the second module according to a detection signal (D) of occurrence of a ground fault in a multiphase medium voltage network. A location module (50) includes an evaluation unit to evaluate a phase shift between the homopolar voltage and the derivative of the homopolar current provided by the second module with respect to pi. Independent claims are also included for the following: (1) an indicator for indicating passage of ground fault (2) a relay for protecting a current line against ground fault (3) a method for directional detection of a ground fault in a multiphase medium voltage network (4) a method for protecting a current line during occurrence of a ground fault.
展开▼