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ADF reduces flicker at Henrad NV

Todays industry constantly faces new challenges. When society expands in Herentals, Belgium, Henrad was faced with the challenge to reduce their flicker emission level in order to not disturb other industries on the public grid


Comsys provided the most advanced and cost efficient solution at the same time!

William de Winter

General Operations Manager, Henrad

We at Laborelec conducted the reference measurements prior to and after the installation – the solution is approved.

Michele de Witte



Henrad is a Belgian radiator manufacturer in the Caradan Group. The 55000 square meter factory in Herentals, Belgium consists of six production lines that in total can produce about 5000 radiators a day. The production process consists of presses, seam welding and spot welding, the nature of the process is very energy demanding and therefore puts great demands on the power grid. In combination, this created large voltage drops in the feeding substation with the result of too high Pst values. This, in turn caused flashing lights when Eandis, the local utility company, would connect other consumers to the same transformer.


The local utility company demanded that the Pst 95% value must not exceed 0,7. Measured values during 2009 provided by the well-known Belgian consultancy firm Laborelec showed tops in the Pst equivalent to 1,6. The task was very challenging due to the rapidly fluctuating load, and the many different load patterns that could occur width such a high number of welding machines.

Key Benefits – Welding – Flicker:

  • Pst reduced from 1.6 to 0.63

  • Only solution with desired flicker mitigation performance without integration with welding lines - easier to instal

  • Fully autonomous solution - will work with future production line upgrades

  • Integrated with existing passive compensation system

Flicker level before compensation
Flicker level before compensation
Flicker level after compensation
Flicker level after compensation

Solution – The ADF P300 Active Filter System

Henrad chose to invest in the ADF P300 Active Filter system, a well proven solution. The market leading response time was a necessity for the customer to reach the values that the utility company demanded. The system consists of six P300 units, making it a total of 2,1 MVAr continous power to compensate for the voltage drops.

Result, Following Installation of theADF Active Harmonic Filters

After installing the ADF Active Harmonic Filters Henrad has managed to keep their Pst value below 0,63, regardless of how many welding lines that are running. The reference values have been measured by Laborelec and approved by Eandis. As a side effect of the lowered flicker value Henrad has also seen a stabilized production environment.