1 Scope This International Standard is applicable to string insulator units of ceramic material or glass for use on d.c. overhead power l ines with a nominal voltage greater than 1 000 V. It is not applicable to composite insulators. The applicat

定价： 910元 / 折扣价： 774 元

1. Scope 1.1 This Standard outlines the principles and general practices of electrical protection applicable to overhead supply systems operating at more than 750 V but less than 50 kV phase to phase and communications systems, where the lines of th

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1. Scope 1.1 This Standard sets forth methods of electrical coordination between pipelines and alternating current (ac) supply lines having line-to-ground voltages greater than 35 kV, simultaneously or separately installed as follows: (a) a pipeline

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