Where it is installed
A line reactor is installed on the supply side of a converter. DC-link chokes, output reactors and sine-wave filters have different positions and functions; they are not interchangeable.
CONVERTERS AND SUPPLY
Line reactors
A line reactor changes the impedance between the supply and a converter. It can help reduce current peaks and distortion, but must be selected for the equipment and network involved.
What needs to be assessed
Rated current and overloads, percentage impedance, short-circuit power, voltage drop and thermal conditions need to suit the converter. Existing built-in chokes must also be considered.
When another approach is needed
A reactor alone may not achieve the required distortion target. Passive filters, active filters or changes to the conversion equipment can then be compared, with their interaction assessed before components are combined.
How Studio PQM helps
Review of the circuit and converters, current analysis and comparison of alternatives, followed by checks of supply conditions after installation.
Compare ranges and features · 2 configurations
General guidance by solution type, using a 400 V low-voltage supply as reference. Ranges summarise the ratings considered and do not imply that all combinations are available. Connection, rating and actual performance must be checked for the project.
| Configuration | Ratings and supply | Features | Checks required |
|---|---|---|---|
| Three-phase reactor — uₖ 4% | 16–400 A; 400 V supply | Rated impedance 4%; current peak limitation | Actual voltage drop, harmonics, losses and compatibility |
| Three-phase reactor — uₖ 5% | 10–400 A; 400 V supply | Rated impedance 5%; higher inserted impedance at the same current | Converter voltage margin, harmonics and thermal conditions |
The uₖ value expresses the percentage voltage across the reactor under its rated reference conditions. Actual installation voltage drop depends on current, frequency and load characteristics; it does not automatically mean a 4% or 5% reduction in converter supply voltage. Selection also considers existing upstream impedance.
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