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About us

Learn more about STRI

Some of our key Milestones

Broschure and Info Sheets

Who are we?

WE ARE STRI – a leading independent laboratory specializing in high voltage testing.

Who do we help?

Our clients are power grid companies, power producers, industries, railway companies, authorities, agencies and manufacturers of electrical equipment all over the world.

Where are we?

Our main offices and laboratory facilities are located in Ludvika, in Sweden’s High Voltage Valley.

Why choose STRI?

There’s no substitute for experience.

We have plenty of it!

  • Nearly 25 years since STRI began operations
  • State-of-the-art testing facilities and climate test hall with one of the highest performances in the world allowing pollution testing of 800 kV HVAC & HVDC equipment

Make the right choice – STRI

Some of our key Milestones


STRI expands again. New test hall. New testing opportunities.


STRI performed a unique full-scale DC voltage test on insulators regarding pollution and ice performance.


Sweden’s largest Smart Grid test lab.
Nordic Smart Grid RD 2 RD&D.


One million volt UHVDC world record!


Powerful expansion.
The ultra HVDC specialist – 800kV HVDC – V-string in porcelain tested for corona and pollution, India.


STRI celebrates 20 years in operation in HVV.


World’s 1st 800 k V UHVDC testing completed at STRI.


Inauguration of unique testing site at STRI for 800 kV.


STRI’s high voltage lab built.

Broschure and Info Sheets


STRI Testing broschure

STRI Testing broschure (pdf, 1,3 MB)

Info sheets

Pollution Testing

Pollution Testing (pdf, 282 kb)

Ice Testing

Ice Testing (pdf, 343 kb)