Transform your transformer
image credit: https://transformers-magazine.com
- May 3, 2021 10:22 am GMTMay 1, 2021 9:55 am GMT
- 118 views
Can a transformer fail? See the picture.
The lifetime of a transformer is between 25 and 40 years. How old is your transformer? When it is more than 20 years old, it is very probable that today’s transformers are much more efficient and will remain cooler. Remember that you can deduct them for a long time from the taxable profit.
Can I save much energy with a better new transformer?
Yes, you will save money for many years in the future!
If the future doesn’t interest you especially, you can always discount future savings in the formula for Net Present Value, to express that. See my last article about financial parameters. Especially with long life investments like transformers, the Simple Payback Time is a bad parameter to adopt.
The USA energy agency EPA tells that significant total life time cost savings are obtained if the new transformer is chosen BETTER than the law requires.
A transformer has an efficiency curve, telling how much % of power is transferred with the load is N% of the nominal value. It is good to look to your daily power demand curve and if there is some region where this power is often included, and match this with the power of maximum efficiency of the (new) transformer. So if you are often between 700 and 800 kW, choose a transformer that works well in this range. If you have more of these regions, work sample during the night you are mostly around 300 kW, it can be a good idea to consider two transformers. This will also make you more fail proof.
The efficiency of a transformer depends also very much on the power factor of all the consumers together, so please adopt power factor correction! This is already in itself a big money saver.