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On-site cable diagnostic with Complex Discharge Analyzing (CDA) test voltage

On-site cable diagnostic with Complex Discharge Analyzing (CDA) test voltage. Dirk Russwurm, HV Technologies, Inc.; Manassas, VA Tel: 703-365-2330 russwurm@hvtechnologies.com. On-site test generators have always been compromises.

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On-site cable diagnostic with Complex Discharge Analyzing (CDA) test voltage

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  1. On-site cable diagnostic with Complex Discharge Analyzing (CDA) test voltage Dirk Russwurm, HV Technologies, Inc.; Manassas, VA Tel: 703-365-2330 russwurm@hvtechnologies.com

  2. On-site test generators have always been compromises • AC resonance test sets are heavy and demand high feeding power • in VLF test sets the voltage stress (dV/dt) is much different from the actual operating conditions • Oscillating tests sets need a large storage capacitor and a higher charging voltage than the test voltage

  3. A generator with a hybrid waveshape has the advantages combined • Charging with 0.1Hz (VLF) keeps the power demand low • Testing with an oscillation of about 60Hz yields results similar to the operating conditions • Oscillating construction has a simple setup • Using the cable capacitance for energy storage eliminates the need for a storage capacitor and higher charging voltage We called this generator “Complex Discharge Analyzer” (CDA)

  4. Limitations of the CDA test voltage • It is optimized for Partial Discharge testing • It is less suited for power factor (tan) and voltage withstand tests

  5. CDA Generator Schematic

  6. Principle of Operation • The cable will be slowly charged up to 2..3x V0 • Then it will be discharged via an inductor • The frequency of the oscillation is 40..80Hz • At the first half cycle the PD signals will be recorded • Usually five shots of each voltage step are taken

  7. CDA Voltage shape

  8. Data Processing • PD signals will be recorded with a high-speed digitizer (100 MSa; 8 Bit) • Data will be digitally filtered and automatically analyzed • PD distribution maps will be generated, showing the location, magnitude and repetition rate of the PD failures for each test voltage step • The PD location uses the “Time-Domain-Reflectometry”, similar to other test systems

  9. PD Calibration Impulse

  10. Recorded Raw Data

  11. PD in XLPE Cable Joint

  12. PD in EPR Cable Joints

  13. Example of Test Van

  14. Operator Panel

  15. On-site cable diagnostic with Complex Discharge Analyzing (CDA) test voltage Dirk Russwurm, HV Technologies, Inc.; Manassas, VA Tel: 703-365-2330 russwurm@hvtechnologies.com

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