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?
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:
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.
High Voltage Products
If you want to purchase a product, need any pricing information or need help or support from ABB, please contact your local partner.