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New Diagnostic Instrument for Transformers and OLTC

New Diagnostic Instrument for Transformers and OLTC. Winding Ohmmeter and Tap Changer Analyzer RMO 60TD. Unique on the market. Analysis of OLTC Up to 60A at 60V Fast charging and short test time Measurement up to 2,000 Ohms resistance Max resistance resolution of 0.1 micro-Ohms

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New Diagnostic Instrument for Transformers and OLTC

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  1. New Diagnostic Instrument for Transformers and OLTC Winding Ohmmeter and Tap Changer Analyzer RMO 60TD

  2. Unique on the market • Analysis of OLTC • Up to 60A at 60V • Fast charging and short test time • Measurement up to 2,000 Ohms resistance • Max resistance resolution of 0.1 micro-Ohms • Programmable ripple detection from 1% to 9.9% • Use 16 bits ADC at 0.1 ms sampling rate • High accuracy at 0.2% • Very light weight = only 13kg • Built-in discharging circuit independent of power supply

  3. Our advantage We record the current – keep the voltage constant • there is no error there • all the transition effects are in the "curve-shape" • we have detected small deviations / small (early) problems Others measure resistance • that is voltage measurement • they keep current constant (or try) • big dI/dt - so the measurement of resistance or voltage is meaningless • ripple  in % is one tool that gives indication of OLTC problem • but it is comparing transition resistance looking for large discrepancies/ large problems

  4. New features • Demagnetizing after the test • Simple and automatic procedure • Motor current recording • Additional information about OLTC operation • OLTC remote control

  5. Control a tap changer from the instrument

  6. Test Equipment RMO60TD

  7. Lap top • Uses DV Win software • Controls the instrument • Records the data • Displays graphs

  8. Chinese language

  9. NEW INSTRUMENT • Three phase dynamic recording • One connection • Single clamp per bushing • Six winding measurement • Output 45A total • 10A per phase dynamic

  10. May 2012 >>>TWA40D

  11. Thank you

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