Siemens SENTRON - Transfer between three sources with one outgoing load

Applications
13.3 Transfer between three sources with one outgoing load
Manual, 08/2017, L1V30368969104A-02
209
13.3
Transfer between three sources with one outgoing load
Transfer with T1 (kVA) = T2 (kVA) = G
The transfer switching equipment can be used for transfer between 3 sources comprising
two transformers T1 and T2 as well as one generator G with an outgoing load. By using two
transfer switches, this complex application in which the power of the 3 sources is equal
(T1 (kVA) = T2 (kVA) = G) can be realized, thus enabling the power supply to be maintained.
Figure 13-4 Transfer T1 (kVA) = T2 (kVA) = G
T1
T2
G
Switching state
of the
transfer switching
equipment
Load
0 0 0 x OFF
1 0 x P1 + P3 ON
0 1 x P2 + P3 ON
0 0 1 P4 ON
1 1 x (P1 or P2)* + P3 ON
* Dependent on the priority setting on the transfer switching equipment