This means if the transformer’s primary side is delta connected just operate on the shunt switch (3) and leave the series switch (1) as it is i.e. The shunt switch is closed for a particular side if that side is delta connected.

Similarly operate on the series switch (2) and leave shunt switch (4) as it is if the secondary side is star connected. This means if the transformer’s primary side is star connected just operate on the series switch (1) and leave the shunt switch (3) as it is i.e. For transformer side with star connected and isolated neutral the series switch is kept open. The series switch is closed for a particular side if that side is star connected and the neutral point is grounded.

A series and shunt switch is provided for each transformer side.

Figure: General Circuit for Determination of Zero Sequence Network of Transformerįor the given circuit for the general arrangement of the zero-sequence network of a transformer, there are two switches provided on either side of the transformer.

Zero configuration networking pdf notes