To determine your kVA size, you’ll need to make a series of calculations based on your electrical schematics. 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. So if you’re working with a three-phase transformer, instead of multiplying the voltage by the amperage and dividing by 1,000 to get the kVA, you’ll multiply the voltage by the amperage by 1.732 and still divide by 1,000 to get the kVA.

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. The electrical load that connects to the secondary winding requires a particular input voltage, or load voltage. Let’s call that voltage V. You’ll need to know what this voltage is — you can find it by looking at the electrical schematic.We could say that an example load voltage V must be 150 volts. R Baker (Electrical) Ltd have an in-house engineering team readily available to work with you. From design through to installation our team are here to help. We aim to produce the most efficient and cost effective solution for your specific transformer requirements. Additional Standards/Certificates:Low Voltage Direct. (72/73/EEC), EMC Direct. (89/336/EEC), Machinery Direct. (89/392/EEC). Generally to BSEN 61558

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. Categories Products Review product LUMER 5KVA Intermittent Rated 5KVA Transformer (Input 240 Volt/Output 110 Volt) There are a few different formulas which can be used to determine the size of a transformer. A useful formula is presented below.

The transformer typically consists of two windings, a primary and secondary winding. Input power flows through the primary winding. The secondary winding then converts the power and sends it to the load through its input leads. A transformer’s rating, or size, is its power level in kilovolt-amperes. However, if you start your transformer often — say more than once an hour — you may want a kVA even larger than your calculated size. And if you’re working with specialized loads, such as those found with motors or medical equipment, your kVA requirements may differ substantially. For specialized applications, you’ll probably want to consult a professional transformer company for advice on what kVA you need. Before you can calculate the necessary kVA for your transformer, you’ll need to figure out your load voltage, which is the voltage required to operate the electrical load. To determine your load voltage, you can look at your electrical schematic. All information obtained while using this calculator should be confirmed by a qualified electrical contractor or engineer. When a piece of electrical equipment malfunctions, the transformer is often the culprit. In that case, you’ll probably need to replace your transformer, and when you do, you’ll need to select one with the correct kVA for your needs. If not, you run the risk of frying your valuable equipment.

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The primary and secondary circuits coil around the magnetic part of the transformer. A couple of different factors determine the secondary voltage — the number of turns in the coils and the voltage and current of the primary circuit. When you’re figuring out kVA size, it’s helpful to have the terminology and abbreviations straight before you begin. You’ll sometimes see transformers, especially smaller ones, sized in units of VA. VA stands for volt-amperes. A transformer with a 100 VA rating, for instance, can handle 100 volts at one ampere(amp) of current. There are many useful tools online to aid you with transformer rating and design, here is a useful link; Transformer Basics How can we help? In many industries, including health care, manufacturing, electrical contracting, higher education and corrections, reliable, high-quality transformers are essential for keeping operations running efficiently. Large facilities and industrial processes require substantial amounts of power, and they need dependable transformers to convert the energy coming from the power plant into a form they can use for their equipment and building utilities.

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 can determine that primary voltageby using the ratios of current and voltage from the transformer’s primary and secondary coils. Maybe you know your transformer has a current of 4 amps and a voltage drop of 10 volts through its secondary coil. You also know your transformer has a current of 6 amps through the primary coil. What should the voltage drop through the primary coil be?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 A single-phase transformer uses a single-phase alternating current. It has two lines of alternating current (AC) power.Below are a few common types: 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