Tap Changer & Winding Analyzers TWA40D

Overview

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Three-Phase Winding Ohmmetrs & Tap Changer Analyzers
Tap Changer & Winding Analyzers TWA40D

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.

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  • 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

  • Mains Power Supply
    • Connection
    according to IEC/EN60320-1; UL498, CSA 22.2
    • Mains supply
    90 V – 264 V AC
    • Frequency
    50/60 Hz
    • Mains supply voltage fluctuations
    up to ±10 % of the nominal voltage
    • Input power
    2250 VA
    • Fuse
    15 A / 250 V, type F, not user replaceable

    Winding Resistance Measurement
    • Test current
    5 mA – 40 A DC
    • Output voltage
    up to 55 V DC
    • Measurement range
    0,1 μΩ – 10 kΩ
    • Typical accuracy
    ± (0,1 % rdg + 0,1 % F.S.)

    Resolution
    • 0,1 μΩ – 999,9 μΩ
    • 1,000 mΩ – 9,999 mΩ
    • 10,00 mΩ – 99,99 mΩ
    • 100,0 mΩ – 999,9 mΩ
    • 1,000 Ω – 99,99 Ω
    • 100,0 Ω – 999,9 Ω
    • 1000 Ω – 9999 Ω
    • 0,1 μΩ
    • 1 μΩ
    • 10 μΩ
    • 0,1 mΩ
    • 10 mΩ
    • 0,1 Ω
    • 1 Ω

    OLTC Dynamic Resistance Measurement
    • Sampling rate
    0,1 ms
    • Automatic open circuit detection and warning
    • Transition current ripple measurement
    • Transition time measurement using DV-Win software
    • Timing measurement of different transition changes using DV-Win graph analysis tools
     
    AC Current Measurement Channel
    • Resolution
    0,1 ms
    • Amplitude resolution
    16 bit

    Computer Interface
    • Computer Interface
    USB
    Optional: RS232

    Data Storage
    • Data Storage
    500 internal memory positions; USB flash drive feature
    enables storage of a huge number of measurements

    Environment conditions
    • Operating temperature
    –10°C to +55°C / 14 F to 131 F
    • Storage and transportation
    –40°C to +70°C / -40 F to 158 F
    • Humidity
    5 % – 95 % relative humidity, non condensing

    Dimensions and Weight
    • Dimensions
    480 mm x 197 mm x 395 mm
    18.9 in x 7.8 in x 15.6 in
    • Weight
    12,8 kg / 28.3 lbs
     
    Warranty
    • Warranty
    three years

    Safety
    • Low Voltage Directive 2014/35/EU (CE Conform)
    • Applicable standards, for a class I instrument, pollution degree 2, 
      Installation category II : IEC EN 61010-1
    • CAN/CSA-C22.2 No. 61010-1

    Electromagnetic Compatibility (EMC)
    • Directive 2014/30/EU (CE Conform)
    • Applicable standard EN 61326-1

    All specifications listed herein are valid at the ambient temperature of + 25 °C (77°F) and with the recommended accessories included.

    Specifications are subject to change without notice.

  • 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.

TRANSFORMER TEST EQUIPMENT

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