What is Electric Transformer?

Electric transformers are used to transform voltage from a higher voltage to a lower voltage. Electric transformers can transform alternating current from one circuit into another through electromagnetic induction. This generally consists of ferromagnetic core and two or more coils called windings. It can either be a single-phase or a three-phase configuration. You have to remember certain specifications when searching for electrical transformers. These include: maximum secondary voltage rating, maximum secondary current rating, maximum power rating and output type. Output choices include AC or DC.

Cores can be constructed as either toroidal or laminated. Toroidal cores have numerous advantages like they provide low magnetic leakage, low noise, close flux path and smaller core size/weight and efficiency. A laminated core is made up of sheets of magnetic material insulated from one another by an oxide or varnish.  Laminated refers to the laminated steel cores. These steel laminations are insulated with a non conducting material such as varnish, and then formed into a core that reduces electrical losses. There are many types like autotransformer, control, current, distribution, general purpose, instrument, step-up and step-down. Mountings include chassis mount, dish or disk mount, enclosure or free standing, h frame and PCB mount.

The most important use of electric transformer is transferring electricity from power plants to homes and businesses. Electric transformer is usually of high voltage at the power plant. Voltage is little lowered when it reaches the substation. When it reaches a smaller transformer, voltage is reduced again. This is a continuous process, which repeats until the power is at a usable level. You have likely seen the type of electrical transformers that sit on top of electric poles. Most of the electrical transformers contain coils or windings that are wrapped around a core. The power travels through a coil. If there are more coils, voltage is much higher. If there are fewer coils, the voltage is low. 

The way electrical transformers work has changed. Transformers have made life easier you can transfer power in a timely, efficient and more economical manner. Many people do not have their houses near a power plant. But it has an added advantage for both homes and businesses because the power plant is nearby then can obtain dependable, affordable electricity. Electricity that is used in homes and business places pass through electrical transformers and reach the end users. There are different types of electrical transformer like site, Portable, Low voltage, Enclosed, Panel Mounted, Three phase, Small Clamped, Inspection Lamp units and custom Electrical transformers.

A current transformer is a type of electrical instrument that is produced to provide a flow of current in the secondary circuit which is accurately perpendicular to the current flowing in its primary circuit. To measure current and monitor the operation of the power grid Current transformers are used extensively and is typically defined by its current ratio from primary to secondary.

Current transformers (Current Transformer) are the most commonly used in metering and protective relaying in the electrical power industry where they facilitate the safest requirement of a huge currents, often in the presence of high voltages on the circuit. The current transformer is safely isolates to measure and to control a circuitry from the high voltages basically present on the circuit is beingcalculated. Current transformers are often maintained by passing a single primary turn under a well-insulated toroidal core with many turns of wire wrapped. Current transformers are used for measuring the flow of current and monitoring the operation of the power used. The Current ransformer is basically defined by its current ratio flowing from primary to secondary.

There are some factors improves the current transformer accuracy.They are like burden, rating factor, load, external electromagnetic fields, temperature and physical Current Transformer configuration. Here, the factor of burden is given below.

The amount of impedance is the cause for the burden in a Current transformer circuit. The basic items that are reasons for the burden in the current measurement circuit are switch blocks meters and intermediate conductors and the sources are the conductor between the meter and the Current Transformer. Also, a problem of producing high resistance occurs due to placing a substation meter at some distance from meter which can be overcome by using current transformer with 1 amp which produce low voltage drop.

The Rating factor of a Current Transformer which is dependent on ambient temperature, is a factor used to determine the absolute maximum measurable primary current by multiplying the full load of a Current Transformer.To maintain the accuracy in raising of the ambient temperature, the Current Transformer will have low capacity, and the rating factors of the Current Transformer s will range from 35 degrees Celsius and 55 degrees Celsius.

Another factor for the accuracy ofCurrent Transformer is Physical Current Transformer configuration. If the conductors are not centered in circular or oval, the inaccuracy occurs in Current Transformer and this should be notified for correct accuracy.

Normally, the Current Transformer’s are constructed in many ways like passing a single primary turn through a well-insulated toroidal core wrapped with many turns of wire. To measure waveforms of high frequency or pulsed currents within high pulsed power systems wideband current transformers are used specially.