3-Phase Extension Unit for DPG10/20 series

With the help of the 3-Phase Extension Unit the Power Choke Tester DPG10 series is also able to measure the inductance of 3-phase power inductors easily and quickly. The 3 windings of the inductor will be measured consecutively and automatically without reconnecting the terminals.

The software considers the different magnetic flux conditions in the core with 3-phase sinusoidal currents and corrects the measurement results with a sophisticated algorithm.

3-PHASE EXTENSION UNIT EXT1

3-PHASE EXTENSION UNIT EXT2

3-PHASE EXTENSION UNIT EXT3

Compared to a measurement with 50Hz mains voltage this method is much easier and faster and also more accurate.

Thanks to the impulse measurement principle of the DPG10 series the measurement takes only 5 – 10 seconds and yields a complete inductance curve L(I), whose current axis is scaled with RMS values.

The measurement result is equivalent to a conventional measurement with 3-phase sinusoidal voltages and currents. Thereby a correction to 50 Hz or 60 Hz is possible.

pdf-icon-33Description and technical data of the 3-phase Extension Unit

pdf-icon-33Publication in the technical journal EE Times (04/2014)

pdf-icon-33Script EE Times (04/2014)

There are three models of the 3-phase extension unit available.

EXT1EXT2EXT3
width370mm470mm470mm
suitable forDPG10 – 100B
DPG10 – 1000B
DPG10 – 2000B
DPG10 – 2000B/E
DPG10 – 3000B/E		DPG10 – 4000B/FDPG20 – 10000B/G

The maximum current, to which the 3-phase inductance measurement is possible, of course depends on the used DPG10 basic unit. With a DPG10-1000B the inductance curve can be measured up to around 580 Arms, with a DPG10-4000B/F up to around 2350 Arms and with a DPG20-10000B/G up to around 5880 Arms. At higher inductance values the current decreases due to the limited maximum pulse energy.

Maximum possible RMS current versus 3~ inductance

3-Phasen-Extension-Unit Finite Elemente Simulation

Finite element analysis of a 3-phase inductor, flux distribution

Scope of delivery

  • 3-Phase Extension Unit
  • Cable set including:
    • Test leads Force and Sense, 3-phase, 1 m each
    • Star point test leads, 3-phase, 1 m
    • 9 alligator clips
    • Force und Sense connecting cables between DPG10 and 3-Phase Extension Unit
    • Control cable between DPG10 and 3-Phase Extension Unit
  • Only included in Extension Unit Ext2: Kelvin test leads 3-phase; 1.5 m; up to 2,5 kARMS (KK31-6)
  • Only included in Extension Unit Ext3: Kelvin test leads 3-phase; 1.5 m; up to 6 kARMS (KL31-10)
  • Instruction manual German / English
  • The DPG10 basic unit is not included in the scope of delivery
Optional test leads
Optional accessories