| 摘要 |
In a plant for transmitting electric power having a power semi-conductor device (10, 25) of turn-off type connected in series with a conductor and a member (31, 32) connected in anti-parallel therewith and having ability to assume a state of blocking a conduction of current therethrough when a voltage is applied across the power semiconductor device in the conducting direction thereof and a state conducting a current therethrough when a voltage is applied across the power semiconductor device in the opposite direction, said member is formed by a controllable second power semiconductor device (31, 32) having the conducting direction opposite to that of said first power semiconductor device of turn-off type.
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