| 摘要 |
PROBLEM TO BE SOLVED: To lighten and downsize a switch for high-tension distribution line, and heighten lightning surge resistance. SOLUTION: The moving electrode 10 of a main electrode disposed between the power source side 8 and the load side 9 of a high-tension distribution line is opening and closing operated by the plunger 13 of an operating magnet 6. When an optical signal is sent from a sub-station via an optical cable 16, a light receiving portion 15a converts the optical signal into an electric signal. Based on the electric signal, a control switch 7 is operated so as to close a contact 32a. High-tension AC is applied to a coil 12 from V, W phase high- tension terminals so that the plunger 3 is attracted so as to close a switch 3. When the plunger 3 is completely moved, the impedance of the coil 12 is increased so as to reduce the current of the coil 12.
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