Siemens SENTRON - Page 211

Applications
13.4 Transfer between three sources with two outgoing loads
Manual, 08/2017, L1V30368969104A-02
211
Transfer with T1 (kVA) = T2 (kVA) > G - variant 2
The application can also be implemented for the following configuration. Three transfer
switches are required for this application. This configuration ensures high source reliability
and thus minimum fault susceptibility.
Figure 13-6 Transfer T1 (kVA) = T2 (kVA) > G
T1
T2
G
Switching state
of the transfer
switching
equipment
Non-critical
load
Critical load
0 0 0 x OFF OFF
1 0 x P1 + P4 + P5 ON ON
0 1 x P2 + P3 + P5 ON ON
0 0 1 P6 OFF ON
1 1 x (P1 or P2)*
+ (P3 or P4)*
+ P5
ON ON
* Dependent on the priority setting on the transfer switching equipment