Safety information
page 20
ELTROPLAN-REVCON
Operation on a transformer
If only a few loads operate within a network section the connected transformer
must be able to transport the in this section not used power back to the next
voltage level without producing a not allowed voltage increase inside the sec-
tion. Therefore the nominal power of the transformer has to be one and a half
higher than the backfed power out of the section, so that also the harmonic and
reactive components of the current can be transmitted. In the network section
displayed in figure 2.6.2 these conditions are checked up, even if the other
loads are switched off.
Is the backfed power in the order of the nominal power of the transformer, it's
impedance voltage has to be small enough (max. 6%) to limit the voltage in-
crease in the section.
The operation of the power feedback unit in combination with an adjusting
transformer (e.g. in the case of a braked slip-ring induction motor) is only al-
lowed, if the quotient ratio of feedback-power and nominal power is much
smaller than one
M
M
R
Tr
10kV
0,4kV
100kVA
60kW
20kW
20kW
FU
REVCON
Figure 2.6.2
