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DCT-2000

Digital Current Transformer Reporter. Digital Current Transformer Reporter. DCT-2000. DCT-2000. CT Purpose. To accurately reduce the primary current to a value suitable for relays and meters. (5 or 1 amps). Provide isolation from the high voltage system. Testing and Verification.

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DCT-2000

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  1. Digital Current Transformer Reporter Digital Current Transformer Reporter DCT-2000 DCT-2000

  2. CT Purpose • To accurately reduce the primary current to a value suitable for relays and meters. (5 or 1 amps). • Provide isolation from the high voltage system.

  3. Testing and Verification • NETA -National Electrical Testing Association Recommendations: • Perform polarity test. • Perform ratio-verification test using voltage or current method • Perform an excitation test. • Measure circuit burden.

  4. Ratio and Polarity • Ratio must be verified so that relays and meters will operate and indicate correctly. • Polarity must be correct if relays are to “look” in the correct direction, and for meters to indicate correctly.

  5. Ratio and Polarity Errors • Taps may have been connected to the wrong terminals or may have been labeled incorrectly. • Wrong number of turns on CT secondary. • Shorted turns. • Wrong polarity markings.

  6. Saturation Voltage • Excitation characteristics and saturation voltage must be known to verify that the CT will perform as required by providing required output voltage during fault conditions.

  7. Excitation of Multi-ratio CT

  8. Typical test circuit of variac volt and amp meters

  9. Time Study • Time to test 5-tap CT (ten ratios and one excitation curve) with older style equipment for: • Ratio • Polarity and phase-angle • Excitation and Saturation • Winding Resistance • Insulation resistance • Time=52 minutes With DCT-2000x5, time < 5 minutes

  10. Adwel solution • The DCT-2000 offers the most advanced features in automated multi-ratio CT testing. • Product available in two models: • DCT-2000x2 • DCT-2000x5 – Test Plan Driven

  11. Key Features of DCT-2000x2 • Automated testing of one winding of a CT for: • Ratio • Polarity and phase-angle • Excitation and Saturation • Winding Resistance • Insulation resistance

  12. DCT-2000x2

  13. Test circuit of x2.

  14. Testing Steps of x2 • Enter windings to be tested • Check-off tests to be preformed • Set a voltage limit • Press test • Observe progress • Save test and go the next winding

  15. Test Screen for x2 ConfiguredNote: x2 does not have test plan

  16. Key Features of x5 • Same as x2 plus: • Automatically tests up to 5 taps with operator intervention. • Test plan driven. • Provides the ultimate in CT testing productivity.

  17. DCT-2000x5

  18. Test circuit of x5.

  19. Test ScreenDriven from the Test Plan

  20. Test Plan

  21. The following screens are common to DCT-2000x2 and DCT-2000x5.

  22. CT Info Screen

  23. Extra Results Details

  24. Extra Results Details

  25. Full Graph Screen

  26. Excitation Table Screen

  27. File Manager

  28. Burden Mode up to 20 amps

  29. Other Features • Saturation voltage (knee point) is calculated. • Winding resistance is measured • Insulation resistance is measured • Full 75 key keyboard • Store 200 files. • Store 140 test plans in x5.

  30. Other Features • Up to 2000 Vac output • Up to 2 amps output • Burden output: 20 amp @ 20 volts • Circuit impedance measurement in burden mode. • Transfer results to PC with USB • Transfer results to memory stick

  31. PC Based Software • Results stored in database. • Sort on twelve fields. • Generate full report form including data and color graphs of all curves. • Files compatible with word processing and spread sheets.

  32. Modes of Operation • Auto mode: • Allows DCT to automatically complete a series of tests. • Manual mode: • Allows operator to manually raise and lower the voltage to make diagnosis. • Burden mode: • Current source for secondary injection

  33. Comparison of models • Both models have identical features regarding tests, output, range, accuracy, keyboard, printer, memory capacity, memory stick, software and database. • Differences are listed below.

  34. Test Automation • X2: • Check boxes on test screen are used to select the tests to be performed in automatic sequence. • X5: • A test plan conducts the required tests on up to ten ratios on a multi-ratio CT. Saves 140 plans.

  35. Extent of Automation • X2: • Completes all selected tests for one winding. • X5 • Completes all selected tests for up to ten ratios.

  36. Conclusion • Contact your local representative or Adwel International for questions or further information.

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