REVCON RHF-Active - Page 28

5. Installation instructions
User manual RHF-Active 28
Remarks:
Routing of wires: The wires between RHF-Active and current transformers must be twisted pair
cables. A correct function is only possible if the wiring matches exact the diagram below. If wires
are interchanged, the harmonics will not be reduced but amplified. To avoid interchanging of wires
it is strongly recommended not to use any wire colour twice.
Wire cross section: T
he cross section of the wires has a significant influence on the quality of
the control. Is the cross section to small in relation to the length of the wire, the resulting
measurement will be too small to achieve a good control quality and good reduction of harmonics.
 =
×××²×

The f
ollowing values needed to be known:
S = Power of the current transformer (typical 2,5VA)
d = Distance (length of cableway) between RHF-Active and current transformer
v = Twisting factor (typical 1,5)
I = secondary current of the current transformer ( typical 5A)
ρ = Rho = specific resistance of copper ( 0,01786
²

)
Example:
 =
××,×

×, ×
, ×²
= 1,07²
Wiring type:
A hybrid between 3P3W and 3P4W is not possible. At 3P3W (installation of two current
transformers) the neutral must not be connected to the RHF-Active. It is mandatory that the
physical installation must match the adjusted method in the software of the RHF-Active. If this is
not observed, the reduction of harmonics is not optimal.