METHOD AND APPARATUS FOR INSULATION MONITORING OF UNEARTHED ELECTRICAL DC- AND AC-POWER NETWORKS

METHOD AND APPARATUS FOR INSULATION MONITORING OF UNEARTHED ELECTRICAL DC- AND AC-POWER NETWORKS

Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (Rf) and capacitive (Cf) insulation impedance between the power supply system and ground. The method includes applying a pulsed AC voltage (U0...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BRENK, Frank, WITTE, Franz-Otto, STREPP, Wolfram
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (Rf) and capacitive (Cf) insulation impedance between the power supply system and ground. The method includes applying a pulsed AC voltage (U0) having alternately different pulsed voltage values to the power supply system to be monitored via a resistive system interface (Ri) between the power supply system and ground. The insulation impedance (Rf) between the power supply system and ground is determined using time profiles of transient processes of the measurement voltage (Vm) prior to transient recovery of the power supply system to the respective pulsed voltage value (U0) of two polarity-inverted pulsed voltage value application processes.