Synthetic test circuit
For investigation of the switching capability of vacuum switches a synthetic test circuit is used.
As core element a capacitor bank is available to produce high pulsed currents. With a various set of coils different pulse widths and pulse shapes can performed.
Test current: up to 35 kA effective
Current waveforms: 50 Hz sinus, 25 Hz sinus, trapezoidal with 7 ms flat top
Transient recovery voltage: up to 50 kV
Maximum energy: 1,35 MJ
Charging voltage of high current circuit: up to 15 kV
High voltage circuit: up to 30 kV
For synthetic tests on circuit breakers a test circuit is used, which is based on the principle of current superposition, also known as Weil-Dobke circuit.
The breaking current is produced by the high current source. The transient recovery voltage is applied to the device under test with a separate high voltage source.
With this setup a breaking test according the standard IEC 62271 and others analyses can be performed.
During the investigations several measurement values can be recorded. For this a transient recorder is responsible. For different requirements special measuring channels are available. A rough overview over the technical specifications is given:
- Number of analog channels: 54
- Maximal resolution: 18 bit
- Maximal input voltage. +/- 1 kV
- Maximal sample rate: 250 MS/s
To transfer the measurement data a galvanic insulated fiber optic transmisson line between recorder and user computer is used.