Harmonic Distortion (THD/TDD) Calculator
Static · formula-only · worked example computed when this page was built · no live data
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, on an 8 kA short-circuit current, 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. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Electrical & Power)
Inputs: a 200 A load with 30% / 20% / 10% 5th / 7th / 11th harmonics on a 400 V system, on an 8 kA short-circuit current.
| Result | Value |
|---|---|
| Current THD | 37.42 % |
| TDD | 37.42 % |
| TDD limit | 8 % |
Computed by WorkHive's calculation engine when this page was built; standard: IEEE 519-2022.
How to use this calculator
- Read the worked example. It uses a 200 A load with 30% / 20% / 10% 5th / 7th / 11th harmonics on a 400 V system, on an 8 kA short-circuit current and shows every number in the method.
- Follow the formula with your own figures: it returns Current THD, TDD, TDD limit, computed per IEEE 519-2022.
- To compute interactively, open the Harmonic Distortion (THD/TDD) Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a harmonic distortion THD TDD calculator IEEE 519?
The Harmonic Distortion (THD/TDD) Calculator is a free online tool that finds current 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 is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). 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, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.