Tap Changer & Winding Analyzers TWA40D

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Overview


The Tap Changer & Winding Analyzer TWA40D is designed for six-winding resistance measurement and simultaneous three-phase on-load tap changer analysis of both the primary and the secondary transformer windings. This is performed with a one single-step cable setup, with test currents of up to 40 A. Each transformer configuration has a special measurement algorithm which is optimized for the fast stabilization of test results.

Additional testing mode, Quick YN, is enabled by the DV-Win software. In this mode, it is possible to measure the resistances of three transformer windings in the YN configuration simultaneously. It is also possible to test the resistances of all tap changer positions of all three phases in a single pass through the tap changer positions.

Accessories

Included accessories

  • DV-Win PC software
  • Ground PE cable
  • USB cable
  • Built-in Tap Changer Control Unit
  • Tap Changer Control cable set 5 m (16.4 ft)
  • USB flash drive feature
  • Mains power cable
Recommended accessories

  • H winding test cable set, 4 x 10 m (38.8 ft) with TTA clamps
  • X winding test cable set, 4 x 10 m (38.8 ft) with TTA clamps
  • Current clamp 30 / 300 A power supplied from the instrument with 5 m (16.4 ft) extension
  • Cable plastic case
  • Transport case
Optional accessories

  • Test shunt 1 mΩ (150 A / 150 mV)
  • H winding test cable set, 4 x 15 m (49.2 ft) with TTA clamps
  • X winding test cable set, 4 x 15 m (49.2 ft)with TTA clamps
  • H winding test cable set, 4 x 20 m (65.6 ft) with TTA clamps
  • X winding test cable set, 4 x 20 m (65.6 ft) with TTA clamps
  • Bluetooth communication module

 

DV-Win

The DV-Win software enables control and observation of the test process, as well as saving and analyzing the results on a PC. It pro-vides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. The software provides an OLTC (tap changer) condition assessment through analysis of the graphs representing dynamic resistance values during the tap changer transitions. Additionally, the DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation. The standard interface is USB. RS232 is optional. Additional testing mode, Quick YN, is enabled by the DV-Win software. In this mode, it is possible to measure the resistances of three transformer windings in the YN configuration simultaneously. It is also possible to test the resistances of all tap changer positions of all three phases in a single pass through the tap changer positions.

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Brochure

Application Notes

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