go to the Capacitors and filters product page Mehdi asked on Jun 29th, 2015 in Capacitors and filters

Is it economically acceptable to design and install a RC surge suppressor to protect an extra high voltage transformer against very fast transients in gas insulated substation?

Regarding the high price of RC surge suppressors in 420kV systems or higher voltage levels, is it economically acceptable to design and install a RC shunt filter to protect an extra high voltage transformer? specially for protecting Transformer against very fast transients in gas insulated substation?

Kurt Schipman, Global Product Marketing Manager Capacitors and filters

ABB's answer

It is not common to install RC surge suppressors for applications with such voltage level.

Keep in mind, however, that if we go further on technical details, it is possible to create a new solution for this specific project. But the following considerations should be taken into account:

  1. It is likely to be a very costly solution compared to what we usually offer. Just by the voltage, we estimate around 15 capacitors units per phase, which would require to be installed on elevated racks, leading us to the second consideration;
  2. The space required would be similar of a standard medium voltage shunt bank solution, plus additional spaces for surge arresters and resistors. In case of space restrictions this solution may not be applicable. And finally;
  3. The resistors required would likely have to be designed to withstand extreme conditions – which can reduce the availability of suppliers.

When looking technically, surge capacitors are normally associated to industrial application levels, which suffer with more frequent on/off switching.

We believe such switching frequency is not expected on high voltage applications.

As a matter of study, it is recommended to check the switching frequency of your application and compare to the number of faults caused by TRVs on similar applications in the market.

If the results bring concern to the project, check which is more economical: remedying the fault versus preventing it.

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  • Kurt Schipman

    Kurt Schipman

    Global Product Marketing Manager Capacitors and filters

    High Voltage Products

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