IEEE 367-1987 pdf free

04-28-2021 comment

IEEE 367-1987 pdf free.IEEE Recommended Practice for Determining the Electric Power StationGround Potential ise and Induced
Voltage from a Power Fault.
IEEE 367 Telecommunication Circuits. Wire-line telecommunicationcircuits, which enter an electric power station, provide telecommunication chan-nels for a wide variety of services. The most important services are channelsused for protective relaying, usually considered as noninterruptible. Wheneverfaults involving a particular power station occur, any resulting station groundpotential rise (GPR) or longitudinally induced voltage (LI), or both, appear be-tween the telecommunication circuits and station ground. Other wire-linetelecommunication circuits that merely pass through the zone of influence ofthe power station are also subject to similar interference;however,their reliability requirements may or may not be the same. The magnitudes, waveform,and duration of the abnormal interfering voltages must be accurately deter-mined to protect wireline telecommunications circuits entering or passing through.
Faults on Power Systems. Power system faults can occur at any point ona power line or in any type of power station at any voltage level.Each locationhas different fault characteristics. Faults can be single line-to-ground(L-G), phase-to-phase, open-phase, double line-to-ground (2L-G), or three-phase and can prog-ress from one to the other. These faults can theoretically be initiated at anypoint on the voltage or current waveform and the resulting fault currents canattain values even higher than 100 kA. The resulting GPR or LI, or both,onadjacent telecommunication facilities can be minimal or quite high. Values of GPR as high as 25 kV rms are possible under unusual circumstances; however,the usual values are less than 10 kV. The waveform of the GPR voltage canvary from the symmetrical to the completely offset,as described in Section 4.The decay time of the directcurrent component (dc offset) of the fault currentmay have a duration of several cycles.
Fault-current studies should be re-evaluated at least every five years and moreoften, if required, due to the ever-increasing MVA capacity or configuration ofthese power systems.IEEE 367 pdf download.

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