3KC3 and 3KC6 transfer switching equipment3KC3 and 3KC6 transfer switching equipment
Transfer between three sources with two outgoing loads
Transfer with T1 (kVA) = T2 (kVA) > G - 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 a non-critical load here.

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)* |
ON |
ON |
* Dependent on the priority setting on the transfer switching equipment
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.

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)* |
ON |
ON |
* Dependent on the priority setting on the transfer switching equipment
Transfer with T1 (kVA) < T2 (kVA) and T2 (kVA) > T3 (kVA)
As well as the previously described applications, applications comprising 3 transformers (T1, T2, T3) where the power of the transformer T2 is greater than that of the other two (T1 (kVA) < T2 (kVA) and T2 (kVA) > T3 (kVA)) can also be implemented with the transfer switching equipment. By using two transfer switches, this complex application can be realized, thus enabling the power supply to be maintained.

T1 |
T2 |
T3 |
Switching state of the transfer switching equipment |
Non-critical load 1 |
Critical |
---|---|---|---|---|---|
0 |
0 |
0 |
x |
OFF |
OFF |
1 |
0 |
0 |
P1 |
ON |
OFF |
0 |
1 |
0 |
P2 + P3 |
ON |
ON |
0 |
0 |
1 |
P4 |
OFF |
ON |
1 |
0 |
1 |
P1 + P4 |
ON |
ON |
0 |
1 |
1 |
P2 |
ON |
ON |
1 |
1 |
0 |
(P1 or P2)* |
ON |
ON |
1 |
1 |
1 |
(P1 or P2)* |
ON |
ON |
* Dependent on the priority setting on the transfer switching equipment