Device for automatic testing of power capacitors

Technology description

The name of the technology: Device for automatic testing of power capacitors
Challenge: A team of the Czech researchers have developed and successfully tested a new device, which principle is based on the invention that tested power capacitor is complemented with a low-loss inductor with loss factor comparable to the loss factor of the tested power capacitor (or lower) to form a parallel oscillating circuit.

Nowadays, the capacitors are tested using Ohms method.
The capacitor is feed with power signal source and the Voltage and current values are observed. The drawback of such tests is that all the current and voltage used for the test must be supplied with the signal source and the source is loaded with reactive power.

The newly introduced equipment enables ultra-precise reactive-power compensation of the tested capacitor in the measuring circuit and matching of the measuring circuit to the driving generator by completing the tested capacitor with the inductor so that the resonant circuit is tuned to the measuring frequency.
Description: The inductor’s inductance is set in the way that at the testing frequency it has the same reactance as the tested power capacitor. The described solution ensures the needed precise compensation of the tested capacitor’s reactive power, which can be viewed as complementing the tested capacitor with the inductor in the way that creates an oscillating circuit tuned at the testing frequency, by automatic correction of the measuring frequency according to instantaneous value of
the oscillating frequency of the measuring circuit. The frequency is controlled by a feedback loop with the voltage-controlled oscillator, integrator and phase detector.
Commercial opportunity: The researchers are looking for manufacturing partners (e.g. manufacturers of power capacitors) interested in a licensing agreement. The subject of the licensing will be know-how (power capacitor principle, detailed scheme of working etc.) as well as know-how for manufacturing of the power capacitor device.
IP protection status: Czech patent no.304363, EPO application.
Development status:

Phase 4

Corresponds with TRL 7 and TRL 8

The transition from the prototype to the final and fully functional form. At this stage, the prototype is already fully tested, or the technology is certified and ready for mass deployment.

  • TRL 7 is the stage where the prototype is fully functional. It does not require professional and special treatment and is ready for use by a regular user
  • TRL 8 represents the phase in which technology development is already complete or technology is certified. Technology, manufacturing, operation and service processes are processed and everything is ready for mass production and use
Partnering strategy: licensing
More information:
Keywords: effectiveness electronics electrotechnics nanotechnology
Categories: Electrical Engineering
Owner of a technology: České vysoké učení technické v Praze
Institution: Czech Technical University in Prague
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