1. Which type of connection would be the best to use at the beginning of a power transmission line? Which connection would be the best to use at the end of a power transmission line? Explain.2. In wye delta and wye wye transformation, what line voltage should be applied in order to have all transformer windings operating at their rated voltage?3, how do you calculate the percentage of the line voltages?
1. unsure you would need to read up on that there are plenty of books on power distribution I get the feeling an explaination wouldnt help you without a bit of research first 2. power transformers are manufactured to a certain specification eg 11,000 in 415V out, the output voltage is dependant on the ratio of windings 3. if the turns ration is 1:100 ie if the primary winding has 1 turn and the secondary winding has 100 turns then the voltage on the secondary will be 100 times that of the primary. (not sure if i have answered your question but i tried!)
1. The transformers at both ends of the transmission line are normally connected wye with the neutral grounded. This is done to provide a 'zero sequence source' for two reasons a. to provide source of ground fault current to a fault on the transmission line to permit that fault to be detected. b. to constrain the elevation of voltage on the healthy phases of the transmission line in the event of a ground fault In order for that wye connection to work, it is usually necessary that the transformer also contain a delta winding. 2. The voltage should be the rated line-to-line voltage of the winding. 3. The line-to-neutral voltage is equal to the line-to-line voltage divided by the square root of three. I don't understand what you mean by 'percentage of the line voltages'.
