so, what is the difference between 87A and 87Q ?
The auto parts guys don't know.
they are at the same location on the relay. ? ?
The auto parts guys don't know.
they are at the same location on the relay. ? ?
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I do not claim to be an electrical engineer at all.
In “Start Trek” terminology, one is “matter” while the other is “anti-matter”.
FWIW:
87Q Operating Signal
It is beneficial to realize that the 87P and 87Q operating signals are related. The 87P operating signals are per-phase sums of the phase zone currents. The 87Q operating signal is the sum of the negative-sequence components of all the phase zone currents.