To identify transformer winding shortage. If there is shortage between winding turns magnetic current test is the best to identify. Shaukt from Abudhabi.UAE
Macroplast Transformers is a leading Current Transformers Manufacturers in India. Current transformers are devices that transform higher current value to lower current value. Current transformers provide galvanic isolation from the voltage on the primary winding while simultaneously creating a power signal that has been converted to a standard level, which in turn permits the use of standard measurement instruments and relays. For more info contact us.
see http://ezinearticles.com/?Testing-a-Transformer--How-To-Accurately-Test-A-Transformer&id=56803 Normally to test a CT we go on with two tests 1. the primary injection test 2. the polarity test 1. primary injection test: a particular amount of current is made to flow through the primary and the amount of current we get from secondary is measured. 2. the name itself describes the test...
All magnetic materials require some energy before they will operate. You can think of it as the price of admission. In an electrical transformer, the excite current is actually a composite of the energy which is lost due to eddy currents in the magnetic material as well as hysteresis losses of the material. Excite current is both frequency and voltage dependent. Instead of saying, "before my husband will do anything I have to bake him a cake", you could say"before my transformer runs at 115Vinput, I have to supply x milliAmps of excite current just to get the core going." A special class of transformers known as CT's or Current Transformer's works in much the same way, except their voltage is reflected off the load instead of coming directly in through the primary. This energy is dissipated as heat. In power transformers, the concern is energy lost with no load connected on the output. In current transformers, the concern is the varying loss of accuracy due to the highly non-linear nature of excite current, especially at low excite levels.
yes its does the higher the current will blow out the transformers
Power transformers convert an alternating electric current into magnetism in the primary circuit. This magnetic flux flows around the core in the form of a fluctuating magnetic field. This flux is transformed back into an electric current in the secondary circuit . The primary circuit consists of a coil of wire, having a known number of turns, wound around a laminated soft iron core. The secondary circuit is also wound around the magnetic core but is electrically isolated from the primary.The linkage between coils is purely magnetic. The number of coils on the secondary dictates whether the transformer steps up the voltage on the primary,or steps it down. It is a simple correlation of turns.ie 100 coils on primary,50 on secondary halves the voltage and doubles the available current on the secondary. They are the most efficient electrical machines ever invented.
The Magnetic Balance test is conducted on Transformers to identify inter turn faults and magnetic imbalance.
No. Transformers are used in circuits with Alternating Current. Transformers work on the principle of a "changing" magnetic field inducing a current in a conductor, and you don't get that "changing" field with Direct Current.
Magnetic balance test is performed on transformer to check, whether the core and windings of the transformer is balance position or not. Magnetic Balance is a test of Critical use as it helps us to enhance the efficiency and life of transformers.
Eddy current loss in Transformers is because of the eddy currents formed in the body of the magnetic core.Whenever a conductor(iron core) exposed to a changing magnetic field a magnetc field produced in the body of the magnetic core.That induce a circulating current in it.Which is called eddy current.In the case transformer it is loss.But it is useful in other purposes.
As a transformer requires an alternating magnetic flux within its core, then the current flowing in its primary winding must be alternating.
magnetising current test, magnetising balance test, s.c test, vector group test, winding resistance test, ratio test
To sense the current flow across the current transformers and to monitor the current ratings. In current transformers no voltage variations occurs. but in voltage transformers it is mainly used to increase or decrease the voltage value.
No. Transformers rely on the magnetic field changing direction to work, so DC can't be used.
They are a component in transformers.
In an AC circuit it is the fluctuation of the sine wave which causes a varying magnetic field which in turn induces a current to flow in the secondary.
A current transformer is used for measurement of alternating electric currents. Current transformers, together with voltage transformers are known as instrument transformers.
Richard Langlois-Berthelot has written: 'Electro-magnetic machines' 'Transformers and generators for power systems' -- subject(s): Alternating current, Electric generators, Electric transformers