Visiting industrial transformers supplies stores, shopping for them, and canvassing the most cost-efficient will most likely show you their ratings in kVA, or kilovolt-ampere rating, rather than the more familiar kW, or kilowatt. Why is this so? Simply, it’s the most suitable rating for these transformers to function well.
Read this knowledge base and guide to find out more about the rationale behind this distinction, as you explore the following pointers:
– Transformers in a nutshell
– How is a transformer rated?
– What is kVA?
– Why are transformers rated in kVA instead of kW?
A Quick Review of Transformers
The most popular types of transformers are those used for residential or industrial purposes. This knowledge base is tackling industrial transformers.
Transformers used for industries are responsible for changing the alternating current voltage flowing from one electric circuit to another via electromagnetic induction or producing an electromotive force across an electrical conductor.
Note that, for instance, a piece of industrial equipment can run without transformers. But, it is best to have them because they:
- Supply the needed voltage and current levels for heavy-duty machinery
- Ensure these equipment’s proper operation and efficiency, among other minor benefits
So, How Are Transformers Rated?
Firstly, before transformers are rated, they are sized with the following factors considered:
- Load demand
- Voltage levels
- Power factor
- Efficiency
- Overload capacity
Once the transformer’s sizing is determined from those factors, it then gets rated mainly from the capacity necessary for it to handle power in the electrical system it is installed into. How is a transformer rated is expressed in kVA, related to how much it can handle the system’s power.
What Is kVA on a Transformer? What Really Does kVA Mean?
Basically speaking, kilovolt-ampere ratings are measuring units for apparent power, or the product of amps and volts. In other words, kVA measures or rates the total amount of power that an electrical system uses.
Remember: one kVA is equal to 1,000 volt-amps. Why is kVA not equal to kW, are you asking? Simply put, while kVA measures apparent power, the latter measures the actual usable power.
Why Are Transformer kVA Ratings That Way and Not in kW?
Setting the Scene
Industrial transfers are rated in kVA, instead of kW, due to how their heat losses are anchored on apparent power – volt-amperes, in particular – instead of the power factor. Again, kVA electrical ratings for transformers reflect the transformer’s capability to handle apparent power but constitute both active (kW) and reactive (kVAR) components. These ensure reliability in performance even under varying loads and power factors. Using this rating, a kVA transformer becomes versatile.
2 Major Reasons Behind This Rating
There are just two reasons that come into play why industrial transformers, as well as other variants, are rated this way.
- Accounting for apparent power: With the kVA electrical rating, copper and iron losses responsible for heating are ruled out. But, keep in mind that these losses are independent of the power factor.
- To handle various loads: Transformers rated using kVA also guarantee they can handle varying loads even with distinct power factors, which further ensures safety throughout the operations. Remember, kW only reflects active power.
Conclusion
So, why are transformers rated in kVA instead of kW? It’s to ensure the transformer performs at its peak and is safe throughout the time you use it, alongside the equipment it serves.
Are you looking for transformers that can fulfill every demand of your industry? Consider getting them from Mingch, a global leader in manufacturing electrical equipment and accessories. Mingch’s transformers have gone through strict inspection, research and development, manufacturing, and packaging to perfectly provide the boost you need for your industries. For more information, contact them today, or read the latest updates on their blog.
