| 摘要 |
An overvoltage arrester for use on AC or DC voltages comprises a voltage dependent leakage component connected in series with a quenching arc path constituted by a series arrangement of main spark gaps and a magnetic blowing coil for extending the arcs drawn across the main spark gaps. An auxiliary spark gap is structurally associated with and serves when struck to ignite each main spark gap and these ignition are connected in series with a first auxiliary impedance which may be an ohmic resistance to establish an auxiliary series circuit that is connected in parallel with the series circuit formed by the leakage resistance component and the main spark gaps. A second auxiliary impedance component which also may be an ohmic resistance is provided for and connected in parallel with each of the ignition spark gaps. Each of the main spark gaps may be paralleled by an auxiliary impedance component, and each of the auxiliary impedance components may be paralleled by a capacitor. The auxiliary impedance components may be lumped or they may be sub-divided and the partial impedances distributed between and in series with the main and ignition spark gaps, respectively. The string of ignition spark gaps when struck serve to ignite the string of quenching spark gaps whereupon the ignition gaps are then extinguished; the arcs struck at the quenching gaps then expand and cool and are extinguished, and the ignition gaps are then restruck to initiate a new quenching cycle. This cycle is then repeated until the discharge is finally terminated. |
