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TB 093 1995 SC 14 WG 14.01.02 Guidelines for testing of thyristor valves for static var compensators.

The application of static var compensators using thyristor valves in power transmission systems has been rapidly increasing in the past decade. Nevertheless there is no international standard for testing of thyristor valves for SVC. The scope of the work was limited to SVCs for power transmission systems. SVC for industrial applications (e.g. flicker control, control of voltage fluctuations caused by motor starting) are not in the scope.

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TABLE OF CONTENTS

1 GENERAL

      1.1 Summary of tests

      1.2 Scope

      1.3 References

      1.4 Definitions

      1.5 Classification of tests

      1.6 Objectives of tests

            1.6.1 Dielectric tests

                  1.6.1.1 Dielectric tests on valve structure

                  1.6.1.2 Dielectric tests between valve terminals

            1.6.2 Operational tests

            1.6.3 Insensitivity to EMI

      1.7 General requirements for performance of tests

      1.8 Test conditions

            1.8.1 General

            1.8.2 Valve temperature at testing

            1.8.3 Redundant thyristor levels

      1.9 Criteria for successful testing

      1.10 Documentation of test results

            1.10.1 Test reports to be issued

            1.10.2 Contents of a type test report

2 TYPE TESTS ON TCR AND TSR VALVES

      2.1 Dielectric tests

            2.1.1 Between valve terminals and earth

                  2.1.1.1 AC

                  2.1.1.2 Switching impulse

                  2.1.1.3 Lightning impulse

            2.1.2 Between phases (for multiple valve units only)

                  2.1.2.1 AC

                  2.1.2.2 Switching impulse

                  2.1.2.3 Lightning impulse

            2.1.3 Between valve terminals

                  2.1.3.1 AC

                  2.1.3.2 Switching impulse

      2.2 Operational tests

            2.2.1 Periodic firing and extinction

            2.2.2 Positive voltage transient during recovery

            2.2.3 Overcurrent

                  2.2.3.1 With subsequent blocking

                  2.2.3.2 Without blocking

            2.2.4 Minimum AC voltage

            2.2.5 Temperature rise

            2.2.6 Non-periodic firing

            2.2.7 Loss determination

3 TYPES TESTS ON TSC VALVES

      3.1 Dielectric tests

            3.1.1 Between valve terminals and earth

                  3.1.1.1 AC-DC

                  3.1.1.2 Switching impulse

                  3.1.1.3 Lightning impulse

            3.1.2 Between phases (for multiple valve units only)

                  3.1.2.1 AC-DC

                  3.1.2.2 Switching impulse

                  3.1.2.3 Lightning impulse

            3.1.3 Between valve terminals

                  3.1.3.1 AC-DC

                  3.1.3.2 Switching impulse

      3.2 Operational tests

            3.2.1 Periodic firing and extinction

            3.2.2 Positive voltage transient during recovery

            3.2.3 Overcurrent

            3.2.4 Minimum AC voltage

            3.2.5 Temperature rise

            3.2.6 Non-periodic firing

            3.2.7 Loss determination

4 ELECTROMAGNETIC INTERFERENCE

5 PRODUCTION TESTS