Synthetic test circuit

Synthetic test circuit

View of the capacitor bank
View of the capacitor bank

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.

Technical data

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

Weil-Dobke circuit

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.

Measurement system

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.