Harmonic Distortion (THD/TDD) Calculator
The Harmonic Distortion Calculator finds current THD and TDD and checks them against the IEEE 519 limit for the point of common coupling. Example: for a 200 A load with 30% / 20% / 10% 5th / 7th / 11th harmonics on a 400 V system, Current THD = 37.42 %, TDD = 37.42 %, TDD limit = 8 % (per IEEE 519-2022).
How it works
Computed from your inputs per IEEE 519-2022.
Worked example (Electrical & Power)
Inputs: a 200 A load with 30% / 20% / 10% 5th / 7th / 11th harmonics on a 400 V system.
| Result | Value |
|---|---|
| Current THD | 37.42 % |
| TDD | 37.42 % |
| TDD limit | 8 % |
Computed live by WorkHive's calculation engine; standard: IEEE 519-2022.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 200 A load with 30% / 20% / 10% 5th / 7th / 11th harmonics on a 400 V system.
- The calculator returns Current THD, TDD, TDD limit, computed per IEEE 519-2022.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a harmonic distortion THD TDD calculator IEEE 519?
The Harmonic Distortion (THD/TDD) Calculator is a free online tool that computes ent THD and TDD and checks them against the IEEE 519 limit for the point of common coupling. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following IEEE 519-2022. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Harmonic Distortion (THD/TDD) Calculator in WorkHive: free, no sign-up needed for the calculators.