Siemens SENTRON - Transfer between three sources with two outgoing loads

Applications
13.4 Transfer between three sources with two outgoing loads
210 Manual, 08/2017, L1V30368969104A-02
13.4
Transfer between three sources with two outgoing loads
Transfer with T1 (kVA) = T2 (kVA) > TG - variant 1
Applications with one generator (G) and two transformers (T1 and T2) are described below
for the case where the power of the two transformers is greater than that of the generator
(T1 (kVA) = T2 (kVA) > G). By using two transfer switches, this complex application can be
realized, thus enabling the power supply to be maintained. The load is divided into a critical
and non-critical load here.
Figure 13-5 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 + P3 ON ON
0 1 x P2 + P3 ON ON
0 0 1 P4 OFF ON
1 1 x (P1 or P2)*
+ P3
ON ON
* Dependent on the priority setting on the transfer switching equipment