I'm doing Signal Processing on signals from high voltage transmission lines but I'm unsure of what noise levels I should be expecting and which types of noise occur in a power system (impulse, harmonic etc.)

The idea is to get signals from current and voltage transformers at substations to do fault detection and classification but the methods I employ are dependent on the noise I should be expecting.

I have seen various SNR values thrown around in different papers but I'm wondering whether anyone could point me to a good source on this topic or perhaps give a brief explanation.

  • \$\begingroup\$ What is the waveform of corona discharges during rainstorms? And how much energy per discharge? \$\endgroup\$ Commented Nov 14, 2017 at 16:59

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There are a few standards which seek to describe what electromagnetic immunity is necessary for equipment in power/substation environments. I would recommend looking to IEC 61000-6-5 for generic power station/substation EMC immunity requirements. This will in turn point you to the appropriate levels in other IEC 61000-4-x standards.

IEC standards are copyrighted, so unfortunately I assume I cannot provide example values here.

Other standards describing immunity in substations for various specific circumstances:

  • IEC 60870-2-1
  • IEEE 1613 (which specifies many of the IEEE C37.90.x standards)
  • IEC 60255-26

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