Harmonic Mitigation
The HMT (Harmonic Mitigating Transformer) is a three phase transformer with 0° or -30° displacement between the primary and the secondary.
An HMT is used to reduce current harmonics on the primary side of a transformer and voltage distortion on
the secondary. A single HMT reduces the flow of triplen harmonics, 3rd, 9th, 15th, 21st, etc into the transformer primary. Used together on the same power line a 0° and -30° HMT will also reduce the 5th and 7th harmonics.
These transformers are designed to reduce voltage distortion when powering non-linear loads.
Applications
For use in environments with non-linear loads such as computers, printers and communication equipment
where stable load and operation is necessary
- Medical facilities including hospitals
- Data centers
- Office buildings
- Schools

Specifications
- K-13 standard
- DOE-2016 efficiency
- NEMA3R enclosure
- 3 phase, 60 Hz
- 480V primary
- Zig-Zag secondary design voltage 208Y/120V
- 0º and -30º phase shifts
- 15 – 1,500 kVA range
- Aluminum windings
- 150ºC temperature rise
- 220ºC insulation class
- Heat-cured ASA-61 gray powder coating finish
- Electrostatic shield
- Cores of high quality electrical steel
Products
Standards
Built in accordance with NEMA, ANSI, UL and CSA standards
UL and CSA Listed
Options and Accessories
Consult factory for more information
- 50 Hz
- Other sizes, voltages and temperature rises available
- Copper windings
- K-4 and K-20
- Dual electrostatic shields
- 115ºC, 80ºC temperature rise