Facts About Step Down Transformers
Step down transformers are devices used to reduce voltage, hence the name “step down.” The primary voltage of these transformers is greater that their secondary voltage. These devices convert high-voltage, low-current power into low-voltage, high-current power. These devices rely on the principle of magnetic induction between their coils to convert voltage from level to a lower level. A varying current in the primary winding generates a magnetic flux in the core, creating a magnetic field in the secondary winding. This magnetic field then induces a varying voltage in the step down transformers’ secondary winding.
An Electrical transformer is based on two basic principles: electromagnetism and electromagnetic induction. In the electromagnetism principle, a current can generate a magnetic field. In the electromagnetic induction principle, a changing magnetic field within a coil of wire induces voltage across the ends of the coil. Modifying the electric current in the primary coil will change the magnetic flux that is developed.
Step down transformers are made from two or more coils. These coils are insulated wire wound around a core made of iron. The iron core is magnetized when voltage is applied to one coil. This iron core then induces a voltage in the other coil. The amount of voltage transmission is determined by the turns ratio of the two sets of windings. In this kind of transformers, the voltage ratio between the primary and secondary coils will mirror the turns ratio. The secondary winding needs larger-gauge wire due to the increase in current. The primary winding does not need larger-gauge wire because it does have to conduct as much current. Fusing is used to protect transformers and its circuits from damages.
The electric power industry uses designations to avoid confusion over which wires will lead to the primary winding and secondary winding. “H” designations are used for the higher voltage winding. “X” designations are used for the lower voltage winding. In a step down transformer, the higher voltage winding is the primary winding while in step up transformers, the secondary winding is the higher voltage winding. As an example, a simple transformer will have wires that are labeled “H1,” “H2,” “X1,” and “X2.”
A power pole or utility pole is used to support transformers. A single pole is commonly utilized to support electric power distribution lines as well as telecommunication cables. The standard utility pole in the United States is estimated to be 12 meters long and is buried about two meters in the ground. Three phase electric transformers maybe mounted on two utility poles.
There are several step down transformers out in the market today. Aya Instruments’ AYA Potenial Transformers are used to monitor single phase and three phase power line voltages in power metering and energy management applications. The transformers’ primary terminals can be connected in line-to-neutral or line-to-line configurations. Lundahl Transformers’ XLR inline transformers are designed for breaking up ground loop in audio systems. The devices are also housed in a magnetically shielded housing with fitted XLR connectors or patch cable ends.
