ABB RVT Serie Instrucciones De Instalación Y De Funcionamiento página 42

Detailed instruction of the connection can be found in
and CT wiring on the controller terminals
manual.
Definition of above type of connections:
3Ph – 3 LN 3
1: one CT connection, 2: two CTs connections, 3: three CTs connections
LN: V measurement between L and N, LL V measurement between phases
1: one V measurement, 3: three V measurements
1Ph: single phase network (L-N or L-L), 3Ph: three phase network
NOTE: L refers to Line, N refers to Neutral
Linear / Circular (Lin./Circ. on the screen)
Linear switching follows the "first in, last out" switching principle.
Circular switching follows the "first in, first out" switching principle.
Both operations are described in the following table.
Circular switching increases the lifetime of capacitors and contactors by balancing the
stress among all the outputs.
In case of "double first step" (1:1:2:2:..., 1:1:2:4:4.,...), the circularity applies to the first
two outputs and also on the outputs of higher value.
Linear
Circular
ì Demand for adding a step
î Demand for removing a step
A7. CT connection type illustration
in the appendix section at the end of this
Power Factor Controller RVT ç Measurements and Settings 41