Methods and test equipment for measuring partial discharge impulses in shielded cables

摘要

PROBLEM TO BE SOLVED: To provide an improved concept for partial discharge measurement in a shielded cable, which enables enhanced measurement sensitivity and accuracy. A method of measuring a partial discharge impulse of a shielded cable GK having a core and a shield, wherein the method is to connect a coupling capacitor KK to a first connection point AL1 of the core, a coupling unit. K1, K2, and K3 are provided, the input unit E of the first coupling unit K1 is connected to the coupling capacitor KK, and the input unit E of the second coupling unit K2 is connected to the first connection point AS1 of the shielding unit. , Connecting the third coupling unit K3 to the second connection point AS2 of the shield, providing the test voltage at the first connection point AL1 of the core, and transmitting each measurement signal at the signal output unit S of the coupling unit. It includes measuring and determining characteristic values for the apparent charge of a partial discharge impulse depending on the measurement signal.