transformer equivalent circuit open and closed circuit test


by xdeimos
Tags: circuit, equivalent, test, transformer
xdeimos
xdeimos is offline
#1
Oct16-13, 02:44 PM
P: 8
I see the open and closed circuit test on the transformer section

I dont understand why we doing that(open and closed circuit test)

can anyone explain and give some example?
Phys.Org News Partner Engineering news on Phys.org
SensaBubble: It's a bubble, but not as we know it (w/ video)
WSU innovation improves drowsy driver detection
Faster computation of electromagnetic interference on an electronic circuit board
berkeman
berkeman is online now
#2
Oct16-13, 03:46 PM
Mentor
berkeman's Avatar
P: 39,720
Quote Quote by xdeimos View Post
I see the open and closed circuit test on the transformer section

I dont understand why we doing that(open and closed circuit test)

can anyone explain and give some example?
Could you be more specific please? What kind of transformers? Where have you seen this? Can you post a link? Do you have any ideas yet for why it is done?
Babadag
Babadag is offline
#3
Oct18-13, 04:01 AM
P: 29
Transformer equivalent circuit open and closed circuit tests are some of required Power Transformer Tests [IEC 60076-1Standard]
1)Measurement of voltage ratio and check of phase displacement :open secondary winding test. Since primary EMF in this case is approximately equal to supply voltage and secondary EMF is secondary output voltage the ratio of primary to secondary voltage
it is EMF ratio then directly proportional with number of turns of the windings.
2) Measurement of short-circuit impedance and load loss :short-circuited secondary winding. The primary voltage will rise until the primary current shall not be less than 50 % of rated. The transformer short-circuit impedance will be then Voltage/Current. The resistance has to be
measured separately. As the supply voltage is reduced the no-load losses-magnetic losses-will be negligible. So the active power
measured in short-circuit test will be proportional will the load-loss.


Register to reply

Related Discussions
Thevenin Equivalent Circuit: using open/short circuit method Engineering, Comp Sci, & Technology Homework 2
Transformer Equivalent Circuit Engineering, Comp Sci, & Technology Homework 2
Transformer Equivalent Circuit Electrical Engineering 1
Transformer Equivalent Circuit Electrical Engineering 2