IEEE - The Institute of Electrical and Electronics Engineers@ Inc.
适用范围
This recommended practice provides guidance for the calculation of power station GPR and LI voltages@ as well as guidance for their appropriate reduction from worst-case values for use in metallic telecommunication protection design. Information is also included for the determination of the following: a) The fault current and the earth return current. (The probability@ waveform@ and duration of these currents and the impedance to remote earthing points used in these GPR and LI calculations as well as the effective X/R ratio are discussed.) b) The zone of influence (ZOI) of the power station GPR. c) The calculation of the inducing currents@ the mutual impedance between power and metallic telecommunication facilities@ and shield factors. d) The channel time requirements for metallic telecommunication facilities where noninterruptible channels are required for protective relaying.