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.
Best Answer
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: