Let’s say you have a transformer with 300 turns in its primary coil and 150 turns in its secondary coil. You also know that the voltage drop through the first coil is 10 volts. Plugging these numbers into the equation given above yields 300/150 = 10/t 2, so you know t 2, the voltage drop through the secondary coil, is 5 volts. How to Determine Primary Voltage Remember that every transformer has a primary and secondary side. In many cases, you’ll want to calculate the primary voltage, which is the voltage the transformer receives from a power source.

The equation for three-phase transformers, which we’ll discuss in more detail below, is also slightly different. When you’re doing calculations with three-phase transformers, you’ll need to include a constant to make sure your work comes out correctly. Standard Transformer Sizes Once you’ve located or calculated these two figures, you can use them to figure out the load’s power requirements in kilowatts. To do that, you’ll need to multiply the required input voltage (V) by the required current load in amperes (l) and then divide that number by 1,000: You’ll then need to determine the particular current flow your electrical load requires. You can look at the electrical schematic to determine this number as well. If you can’t locate the required current flow, you can calculate it by dividing the input voltage by the input resistance. Let’s say the required load phase current, which we’ll call l, is 50 amperes. Very easy company to deal with, efficient and attentive. Deliver on the date we request. Competitive prices. Great company. Thanks you for choosing our product(s). We offer a 12 month warranty for parts and labour against any defects in components or faulty workmanship in manufacturing.NOTE: We do not recommend loading a transformer above 80% of its KVA rating. When the KVA rating has been calculated, divide that number by 0.8 to get the minimum KVA rating needed. All values should be reviewed and confirmed by an electrician or electrical engineer. A malfunctioning or broken-down transformer can lead to costly delays and make your business less profitable. Keep your operations running efficiently by staying on top of transformer repairs or getting a custom new system from ELSCO Transformers. Our essential staff members have over two decades of experience in the industry, and we parlay that extensive experience, knowledge and expertise into giving you reliable units that will run dependably and perform well for years.

Our transformers are generally double wound, enclosed in a steel or insulated enclosure, usually offering high levels of ingress protection. NOTE: If you need assistance with circuit protection devices such as fuses or breakers, or wire sizing, please consult a licensed electrical contractor or electrician in your area who will be familiar with state and local codes.The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current. So you’ll multiply your kVA rating by 1,000 and then divide by the amperage. If your transformer has a kVA rating of 75 and your amperage is 312.5, you’ll plug those numbers into the equation — 75 * 1,000 / 312.5 = 240 volts. How to Determine Secondary Voltage

kVA stands for Kilovolt-Ampere and is the rating normally used to rate a transformer. The size of a transformer is determined by the kVA of the load. In many circumstances the power required by the load is equivalent to the rating of the transformer expressed in either VA or kVA. For example a 1KW (1000 Watts) load would require a 1kVA transformer @ unity power factor. All information obtained while using this calculator should be confirmed by a qualified electrical contractor or engineer. Transformers convert energy from the source to the power required by the load. To use their transformers effectively, businesses need to know how much power their particular transformers can give them.A transformer’s rating provides that information.

It is advised that the kVA of the transformer should be equal to or greater than the rating of the load to handle present requirements. The kVA rating will also be affected by the application of the load, for example motors may need an increased kVA rating. Transformer Formulas What is the Load Voltage