| 摘要 |
PURPOSE:To protect a thermo-switch by inserting an inductance to the part of the connecting line of a circuit in which the switch is connected in series with a gas discharge tube to absorb an abnormal voltage. CONSTITUTION:A series circuit II of a gas discharge tube H and a thermo- switch S is connected in parallel with a spark gap G to form an arrester. A ferrite tube F is inserted to work as an inductance to the part of the connecting line of the circuit II. The tube H is initially operated by means of a lightning surge, a voltage between the terminals of the circuit II temporarily extremely drops. Thus, it is difficult to fire a lightning surge current at the gap G as it is. However, the switch S is opened immediately before the tube H is thermally broken down due to an increase in the current to protect the tube H, and the gap G is fired by a high voltage generated at both ends of the tube F at the moment that the current is interrupted.
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