Deck 8: Three-Phase Delta Connection

Question 1

A(n) ____________________ secondary can also be connected as a four-wire delta secondary.

Answer 1

Transformer

Question 2

The delta connection takes its name from the Greek letter because of its ____________________ appearance.

Answer 2

Trueriangular

Question 3

The A phase is 20 A and the C phase is 15 A. What is the neutral?

Answer 3

If the A phase is 20 A and the C phase is 15 A, then the neutral is 5 A.

Question 4

In a four-wire delta connection, the neutral currents are calculated the same way as in a wye system.

Question 5

The following statement is true of the three-phase delta connection: E_Line = ____________________.

Question 6

Calculate the neutral current if there is single-phase and three-phase load on a delta four-wire system, and phase A has 30 A, phase B has 10 A, and phase C has 16 A.

Question 7

In a balanced circuit, the phase currents are equal.

Question 8

The windings in a delta connection are spaced 130 electrical degrees apart.

Question 9

The line current is the ____________________ of the two phase currents.

Question 10

What must happen before completing a delta connection?

Question 11

The three-wire delta system is used when three-phase power on three conductors is required.

Question 12

The voltage reading across any pair of line wires of a balanced three-phase delta connection is equal to the voltage measured across the ____________________.

Question 13

If the phase current in each winding of a generator or transformer is 10 amperes, what is the line current?

Question 14

If the voltmeter reads zero across C₂-A₁, the circuit may be closed.

Question 15

What do you call the point at the midpoint of the winding?