- #1
KraakeCrest
- 18
- 2
Hi
Take a look at the picture below, I am curious of what transformer connections are used at each step up/step down transformer. I am sure that there are several way of connecting them and each have their pros and cons, but what are the most usual connections?
Lets start at the consumer and work backwards:
I would assume that there is a star connection with neutral on the secondary side at the 120/240 voltage level to support single phase circuits etc. On the primary side, maybe a delta connection or star with neutral to be able to support the flow of zero sequence currents?
Green substation step-down transformer:
Not sure, but I would assume a three conductor configuration to avoid the extra cost of a 4th wire on the primary side.
Generator step up transformer:
Same here, three conductor configuration on the secondary to avoid a 4th wire. Unsure about primary side.
And are the star "neutral point" always grounded or are there exceptions?
Take a look at the picture below, I am curious of what transformer connections are used at each step up/step down transformer. I am sure that there are several way of connecting them and each have their pros and cons, but what are the most usual connections?
Lets start at the consumer and work backwards:
I would assume that there is a star connection with neutral on the secondary side at the 120/240 voltage level to support single phase circuits etc. On the primary side, maybe a delta connection or star with neutral to be able to support the flow of zero sequence currents?
Green substation step-down transformer:
Not sure, but I would assume a three conductor configuration to avoid the extra cost of a 4th wire on the primary side.
Generator step up transformer:
Same here, three conductor configuration on the secondary to avoid a 4th wire. Unsure about primary side.
And are the star "neutral point" always grounded or are there exceptions?