Trends & Demands from TSOs Driving New Investment in High Voltage Laboratories Dan Windmar
Background • Some TSOs have put as a requirement that type testing of a specific product should be done in one laboratory or under the surveillance of one laboratory. • Another factor is that the requirements in the standards today are not stringent enough compared to the experience from service. • Also some TSOs want to qualify products thus performing the tests either together with the suppliers or without them
Investments based on increased requirements • Ca 10 years ago an investment was made in a site for long term testing of equipment for UHV • 2011 a new high voltage test hall was inaugurated which primarily function is type testing of HV AC and DC cables • In 2015 further investments were made in more test facilities, also primarily for testing of HV cables
Prequalification testing of DC Cable systems • Testing for four German TSOs • 525 kV DC cable tested at 761 kV DC for one year • Cable should see similar stress as in service • Switching impulses superimposed on DC should be performed on the complete cable system 4
Increased need for cable testing • The test hall is fully equipped in order to be able to test high voltage equipment with system voltages up to 500 kV. The investment consisted of a high voltage hall, 600 kV resonance transformer and a 2 MV, 200 kJ, impulse generator. 5
Requirements on testing in one laboratory • Bending test on cable • Material testing 6
New test site for PQ testing of AC cables • The increased need for cables in the transmission systems pushes the need for further investments in PQ testing 7
Requirements on testing of bushings • Cantilever tests • Increased need for higher and higher AC and DC currents in temperature rise tests 8
Summary • Changing market pushes the need for investments and other measures • It is clear that the development on the market will continue to push further development and investments in new test equipment, test labs and test methods 9
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