Circuit Arrangement For Generating a Test Voltage, in Particular For Testing The Insulation of Installed Cable

摘要

The invention relates to a circuit arrangement for generating a test voltage, in particular for testing electrical equipment, comprising an alternating voltage source or a voltage source having constant or essentially constant voltage and a circuit means connected to the voltage source for generating a preferably low-frequency alternating voltage U0. A power converter, preferably configured as a resonant converter, is connected to the alternating voltage source. A transformer device connected to the power converter is used for generating a high frequency UT, and a rectifier circuit means, in particular a cascaded and/or multistage one, is used for converting the high frequency to an amplitude that can be changed to a direct current voltage UHV. Furthermore, a switch device for charging the equipment being tested with the direct current voltage UHV and for discharging same is provided. In said circuit arrangement, the input of a converter is connected to the alternating voltage source U0 and the output of the converter is connected to the switch device for charging and discharging the equipment being tested. On the input side, the power converter is configured with (n) switch elements, and on the output side, the power converter comprises several (k) stages. The rectifier circuit means (C1 to C4, S5 to S8) is configured combined as an inverter circuit for discharging the equipment being tested, the switches of which can also be switched to valves that allow current flow in one direction only.

主权项

1. A circuit arrangement for generating a test voltage for testing electrical operating means, comprising:
an alternating voltage source or a voltage source with a constant or essentially constant voltage (U0) and with a circuit means for generating a low-frequency alternating voltage, an inverter connected to the alternating voltage source (U0), a transformer device (T) connected to the cascade rectifier/inverse rectifier for generating a high voltage (UT), a rectifier circuit means (C1 to C4, S5 to S8), designed in a cascaded and/or multi-step manner, for conversion of the high voltage (UT) into a direct voltage (UHV) of variable amplitude, a circuit device for charging the test subject with the direct voltage (UHV) and for discharging the test subject, characterised in that the output of the inverter is connected to the circuit device for charging and discharging the test subject, wherein, on the input side, the inverter is designed with (n) switching elements (SA to SD), and on the output side the inverter comprises a plurality (k) of steps, and the rectifier circuit means (C1 to C4, S5 to S8) is designed in a combined manner as an inverter circuit for discharging the test subject (15), the switches of which can also be switched as valves which permit the flow of current in only one direction.