ABB REC670 Applications Manual page 396

Section 14
Control
390
M
F
I
IEC06000633 V2 EN-US
Figure 173: Principle for a three-position switch Master/Follower/Single
Parallel control with the reverse reactance method
Consider Figure 174 with two parallel transformers with equal rated data and
similar tap changers. The tap positions will diverge and finally end up in a runaway
tap situation if no measures to avoid this are taken.
1MRK 511 401-UEN A
BIM/IOM TR8ATCC
FORCMAST
RSTMAST
SNGLMODE
IEC06000633-2-en.vsd
Bay control REC670 2.2 IEC
SEMOD159053-145 v4
Application manual