definitions
What does dielectric oil do?
It provides insulation in-between the transformer winding's and the case.
True or False.
Delta has a neutral.
False
what connection converts three phase power into two phase power?
Scott connection
A delta connected set of winding's has a phase voltage of 40 V. What's the line voltage?
40V
A delta connected three phase alternator is driving a wye connected load. the alternator output voltage is 480v. The load resistors are 12 ohms each. what is the phase current?
40A
How do you close a delta?
Make the final connection to complete the delta connection
three phase transformer connection the primary leads are labeled____ and the secondary leads are labeled___.
H:X
A "T" connection the main transformer must have a center tap of what percentage to be for both primary and secondary.
86.6%
voltage measured across one winding is the?
Phase
A wye delta transformer has a primary line voltage of 7200v and a secondary line voltage of 480v. what is the turns ratio?
8.66:1
what does a one line diagram show?
Power runs not actual connections.
The main power distribution system of a large industrial plant is generally shown by using a____ diagram.
one line
what kind of connection permits more power to be supplied for the operation of three phase loads.
closed delta or delta
Calculating power in a three phase circuit, the product of the line voltage and line current and power factor is multiplied by?
Square root of three
A wye connected secondary has a phase voltage of 277.14v. What is the line voltage?
160v
what leg should the orange wire be marked on?
L2 or middle leg of the 3.
A open delta connection is made by using ___ single phase transformers.
2
what connection is used for grounding purposes?
Zig-Zag connection
A delta connected set of windings has a phase current of 10 A. the line current is?
5.77A
A delta wye transformer has a turns ratio of 9:1. the Primary line voltage is 3600v. what is the secondary line voltage?
692.8v
whats a three phase bank?
3 single phase transformers connected in a way that creates 3 phase power and operates on 3 phase system.
when using an open delta with a center tapped transformer, one wire is the high leg. the high leg is the one that is ___
10 ish volts
what connection made with rectifiers makes a smoother DC output voltage
six phase connection
In a three phase system, the delivered power what?
Never falls to zero
A wye delta transformer has a turns ratio of 2:1 secondary line voltage 480v. the secondary is connected to a wye connected three phase resistive load of 50 ohms in each phase. what is the current flow in each load resistor?
5.54A