Why Distribution transformers are normally connected as primary in data and secondary in Star?
Advantages of Star Delta Connection
The primary side is star connected. Hence fewer numbers of turns are required. This makes the connection economical for large high voltage step down power transformers. The neutral available on the primary can be earthed to avoid distortion.
Why Star side of transformer is connected to Delta and Delta side is connected to star in differential protection?
In order to nullify the phase shift of the Power transformer (PT), The Current transformers (CT) connected in a reverse configuration. The star-star power transformer is protected by the current transformer having delta/delta connections.
What is the purpose of star connection?
A star connection is a connection used in a polyphase electrical device or system of devices in which the windings each have one end connected to a common junction, and the other end to a separate terminal.
The connecting link between the primary and secondary distribution system is the “distribution transformer.” Distribution voltages are those voltages connected to primaries of these transformers. Utilization voltages are those voltages that are connected to the loads.
Why CTs on Star side of transformer winding is connected in delta and CTs on Delta side of transformer winding is connected in star?
As a general rule, the CTs on any star winding of a power transformer are connected in delta and that the CTs on any delta winding are connected in star. Table 9.1 shows the type of connections to be used for CTs in order to compensate for the phase difference in the primary and secondary currents of power transformer.
Why the CT connections are in Star Connection for Delta and Delta connected for star?
Advantage of Star connection in Potential transformer:
Due to that the insulation cost on the primary winding comes lesser. But in delta configuration the line voltage is equal to phase voltage, therefore we have to insulate the transformer to withstand up to 11kV.
Which is better Star or Delta Connection?
Generally, star connection is used where you need a neutral and two separate voltages, like our distribution system. Delta connection is generally preferred where neutral conductor is not needed like for transmission of high voltage power.
Why is Wye better than Delta?
An advantage of the Delta connection is higher reliability. If one of the three primary windings fails, the secondary will still produce full voltage on all three phases. … An advantage of the Wye connection is that it can provide multiple voltages without the need for additional transformers.
Why Delta is used in distribution?
delta -star to reduce the voltage. we use high voltage for transmission to deteriorate losses and we can not just distribute in that level of high voltage to consumers therefore it has to be reduced by step down transformer.