In the converter station of high-voltage DC (HVDC) transmission system. by-pass switch is required to commutate do current to by-pass pair thyristor valves by using its arc voltage when the converter station is get started for operating.
When HVDC gas insulated switchgear (HVDC-GIS) is intended to be installed at the do side of the converter station, SF6 gas circuit breaker is desirable to be used as by-pass switch. But, it has been known that arc voltage of SF6 gas circuit breaker is lower than that of air blast breaker or oil breaker which have been used hitherto as by-pass switches.
This paper showed that SF6 gas circuit breakers were possible to be used as HVDC by-pass switches by describing followings. (I) DC arc voltage characteristics of SF6 gas circuit breaker were measured. (II) Thyristor minimum turn on voltage was measured and it was showed that amplitude of the arc voltages was enough to turn on thyristor valve. (III) Commutation tests with do current 2800A were carried out with a test circuit which simulated the characteristics of anode reactor and thyristor forward voltage drop. the test results showed that a de 2800A current was successfully commutated by the SF6 gas circuit breaker. (IV) Calculations were conducted by simulating the DC current commutation processes and the calculation results agreed well with the test results.
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