calculations
delta windings have a phase current of 10A what is the line current
17.32A
transformer in which the secondary is larger then the primary
step-up
square root of 3
1.732
define autotransformer
transformers that have one winding for primary and secondary
three phase connection voltage measured directly across the windings is
Phase
delta windings have 480v line what is the phase volts
480
transformer in which the primary is larger then the secondary
step-down
2:1 turns ratio
P S
120 ?
60
define laminated
Something made of thin sheets stacked
three phase the current that flows in an externally connected voltage conductor is
Line
P S
240v 60v
I: I:
W: 5 ohm
P S
240v 60v
I: 48* I: 12*
P: 11,520* 5 ohms
define ground
earth
how do you find Ip
define primary winding
power input of a transformer
Line current and phase current are the same
Y
P S
240v 120v
I: I:
va:480 ohms: R:
P S
240v 120v
I: 2* I: 4*
va:480 ohms: 30* R: 2:1*
Power input in a transformer is called
the primary
how do volts relate to the primary and secondary
ones higher ones lower
define inrush current
the amount of current that is drawn when an inductive device is first connected
Line voltage and Phase voltage are the same
Delta
How do you determine voltage on a transformer
measure it
P S
V: 120 V:
I: I: 10
va: 480 ohm: 20 R: 1:1.667
P S
V: 120 V: 200*
I: 4* I: 10
va 480 ohm: 20
single phase
EP 7200 ES ?
AP ? AS 40
va 28800 w ?
ES 720
AP 4
W 28800
define current regulator
a transformer that supplies a constant amount of current
delta windings are 100v phase whats the line volts
100v