Planning levels and harmonic measurements on Hydro-Quebec's transmission system

Harmonic allocation using IEC/TR 61000-3-6 at the distribution/transmission interface

“…It is worth noting that there are several papers which state that their harmonic voltages are larger than the present planning levels with no apparent harm [5], [6] and an increase in HV planning levels would appear to be welcomed.…”

“…Since the flow of harmonic current in general is from the LV part of the power system to the HV transmission system and then into generators, the harmonic profile of a typical power system Harmonic Allocation Using IEC/TR 61000- [3][4][5][6] at the Distribution/Transmission Interface shows the highest voltages at LV, reducing through the MV system to the HV system. To assist with allocating harmonic loads to different voltage levels, the planning levels are graded from higher values at LV to the smallest values at HV/EHV [1].…”

“…Harmonic planning levels are exceeded at some sites for some harmonics in the range 11-37 but there have been no reports of interference. Another [6] reports a harmonic survey of 28 substations in a 69/315kV transmission system. Planning levels were exceeded at some sites at the 5 th , 11 th , 23 rd , 25 th , 35 th and 37 th harmonics.…”

Mobile monitoring system to take nationwide PQ measurements on electricity transmission systems

“…Some extended power quality surveys have been conducted in a few countries, with particular emphasis on voltage quality, and/or voltage harmonics only [1][2][3]. A web-enabled monitoring system has been developed for nationwide use in [4], to record only distribution system voltage quality parameters by low cost, permanent PQ monitors.…”