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.

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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

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.

87524636811.png
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

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.

87524641163.png
Transfer T1 (kVA) < T2 (kVA) and T2 (kVA) > T3 (kVA)

T1

T2

T3

Switching state of the transfer switching equipment

Non-critical load 1

Critical
load 2

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
+ (P3 or P4)*

ON

ON

1

1

0

(P1 or P2)*
+ P3

ON

ON

1

1

1

(P1 or P2)*
+ (P3 or P4)*

ON

ON

* Dependent on the priority setting on the transfer switching equipment