Example 6: 3-phase choke for mains filter

To measure the inductance of 3-phase chokes the 3-phase Extension Unit as an additional unit for the Power Choke Tester DPG10 series is necessary. A single phase measurement without the 3-phase Extension Unit would lead to wrong measurement results due to the different flux conditions in the core.

In this example a 3-phase filter choke made of grain-oriented electrical sheet is shown. The continuous rated current is 65 ARMS, the weight is approximately 35 kg. In contrast to most other 3-phase chokes the inductance of all three legs is nearly the same at this choke due its special construction. At most 3-phase chokes the inductance of the outer legs is several percent lower than the inductance of the middle leg due to the unsymmetrical core geometry.

Example 6 report e

Entire measurement report

To make routine testing easier during production, minimum and maximum limit curves can be defined. If the measured inductance curve falls within the range created by these two limit curves, then the test component is passed, if not then it is failed.

Example 6 report e2

Entire measurement report

  1. PFC choke with nanocrystalline core
  2. Filter reactor with ferrite core under temperature influence
  3. Filter reactor with high flux core
  4. Mains line choke with laminated iron core
  5. VHF choke with ferrite rod core
  6. 3-phase choke for mains filter
  7. Current compensated chokes
  8. Inductor with iron powder core