Patent ID: 7095236

Claim:
A method for testing high-voltage alternating-current power switches in a synthetic test circuit with a high-current circuit comprising a high-current source connected in series with at least one auxiliary switch and one test switch, and with a high-voltage oscillating circuit comprising a high-voltage source to be connected parallel to the test switch before the current zero of the high current, at which already an interruption possibility exists, and conducting an oscillating current, comprising the step of: connecting the high-voltage oscillating circuit in parallel to the test switch in a time interval before the current zero of the high current with an interruption possibility, which is determined by a half-cycle duration (T h /2) of the oscillating current (i h ) less the duration of equivalence (Δt se ) of the sole flow of the oscillating current as sequential current in the test switch with a stress exerted upon the switch by the homogeneous current in a direct test circuit, wherein the sequential-current flow duration of the equivalence results, at least approximately, from the comparison of the values of common physical stress parameters acting in the test switch during the test, on the one hand, in the synthetic test circuit and, on the other hand, in the direct test circuit.