Use three-phase transformer

Three-phase five-column core transformer must be used YN, yn0, yn0 connection when the transformer in the transformer should be air circuit breaker in the fourth winding angle connection, it does not lead to early (when electrical tests done on the structure leads to early not in this case).
 High voltage winding of the transformer for domestic general Liancheng Y connection, medium voltage and low  windings connected in the system depends on circumstances. The so-called high-voltage transmission Electric energy meter refers to the amount of the system voltage in the phase of the transmission system or low-pressure relationship between voltage phasors. Distribution systems, such as low-pressure system can be determined according to the standard requirements.
High voltage winding often linked into Y connection is due to phase voltage can be equal to 57.7% of the line voltage, the voltage can be lower each turn.