Loading patent…
AssigneeBender GmbH & Co. KG
InventorDieter Hackl
Estimating the term…
A method and devices for testing and monitoring the continuity of a PEN conductor for a three-phase TN-C-S power supply system to which operating equipment is connected via a single or three phases. As intended by the invention, a voltage is measured for this purpose at a virtual star point set up according to the invention at operating equipment using three-phase machine terminals, and the measured star-point voltage is evaluated. Should the star-point voltage exceed a critical voltage, the operating equipment is disconnected. The invention therefore does not require a constructively difficult installation of a local reference ground. For operating equipment with single-phase machine terminals, a load voltage is measured in a first and a second load case along with a computation of a loop impedance from the voltage change and a residual-current change. The thus determined loop impedance value allows drawing a conclusion on whether a functional PEN conductor is present.
A method for testing and monitoring the continuity of a PEN conductor (PEN) for a three-phase TN-C-S power supply system (2) which has external conductors (L1, L2, L3), a neutral conductor (N), a protective ground (PE) and the PEN conductor (PEN) and to which 3 AC operating equipment (4) having three-phase 3 AC machine terminals (KL1, KL2, KL3, KN, KPE) is connected, the 3 AC operating equipment (4) being connected to at least one of the external conductors (L1, L2, L3), the neutral conductors (N) and the protective conductor (PE), the method comprising the following steps:
A method for testing and monitoring the continuity of a PEN conductor (PEN) for a three-phase TN-C-S power supply system (2) which has external conductors (L1, L2, L3), a neutral conductor (N), a protective conductor (PE) and the PEN conductor (PEN) and to which AC operating equipment (6) having single-phase AC machine terminals (KL3, KN, KPE) is connected, the AC operating equipment (6) being connected to one of the external conductors (L3), the neutral conductor (N) and the protective conductor (PE), the method comprising the following steps:
A device for testing and monitoring the continuity of a PEN conductor (PEN) for a three-phase TN-C-S power supply system (2) which has external conductors (L1, L2, L3), a neutral conductor (N), a protective conductor (PE) and the PEN conductor (PEN) and to which 3 AC operating equipment (4) is connected via three phases and 3 AC machine terminals (KL1, KL2, KL3, KN, KPE) to the external conductors (L1, L2, L3), the neutral conductor (N) and the protective conductor (PE), with a 3 AC switching element (18) to disconnect the 3 AC operating equipment (4),
A device for testing and monitoring the continuity of a PEN conductor (PEN) for a three-phase TN-C-S power supply system (2) which has external conductors (L1, L2, L3), a neutral conductor (N), a protective conductor (PE) and the PEN conductor (PEN) and to which AC operating equipment (6) is connected via one phase and AC machine terminals (KL3, KN, KPE) to one of the external conductors (L3), the neutral conductor (N) and the protective conductor (PE), with an AC switching element (30) to disconnect the AC operating equipment (6),
Dependencies are inferred from the claim text.