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Quality Control Stages of MV GIS and PD - Measurement

Partial Discharge Diagnostic of Medium Voltage Switchgear under Operating Conditions using a special PD- Probe. Quality Control Stages of MV GIS and PD - Measurement. demands high sensitivity ( ~ pC) failure identification failure location. development manufacturing

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Quality Control Stages of MV GIS and PD - Measurement

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  1. Partial Discharge Diagnostic of Medium Voltage Switchgear under Operating Conditions using a special PD- Probe

  2. Quality Control Stages of MV GIS and PD - Measurement • demands • high sensitivity ( ~ pC) • failure identification • failure location development manufacturing assembling transport/ on site assembling operation pd- measurement pd data base (pc- based system) PRPD pattern

  3. Phase- Resolved-PD- (PRPD) Pattern measured parameter: q (U, φ, t, ….) acc. to CIGRE- format)

  4. PRPD- Pattern of a defect part PD pattern of a separation between the insert and the cast resin at the grounded side of a 36-kV-spacer

  5. special problems for on- site- diagnosis • demand for no- switching- off of operational voltage, but compatibility to pd- test procedures during manu- facturing process  measuring ofPRPD- pattern for comparison with reference pd- data- base seems to be necessary  calibrating procedures are necessary (unconventional measuring methods like acoustical/ optical methods are not sufficient)  coupling elements are necessary

  6. Typical measurement conditions for on- site- testing pd´s superimposed with large distur- bances caused by near located SFC pd- spectra with disturbances

  7. special problems for on- site- diagnosis • requirement of high measuring sensitivity  special requirements/ procedures for suppressing of noise/ disturbances

  8. pd- on- site measurement by electromagnetic field coupling

  9. transfer characteristic of pd- probes (UHF- measurement) UHF- Measurement [acc. to IEC 60270]

  10. transfer characteristic with and without pd- probe

  11. diagnostic- object: medium voltage switchgear capacitive sensor user- table h.v. joints 36kV GIS- substation modules

  12. measuring sensitivity with capacitive sensor coupling equivalent test circuit q- sensitivity is non sufficient

  13. medium voltage switchgear with additional cable- parts capacitive sensor user- table h.v. joints cable- parts

  14. transfer characteristic with additional cable- parts test circuit transfer characteristic

  15. pd calibration with and without connected power cable • with power cable • classical pd- meas. system • - pd- probe without power cable

  16. diagnosis results capacitive sensor pd probe and measuring impedance defect spacer

  17. conclusions • pd measurements are up to now an essen- tial tool for quality testing of electrical insulation even for on- site diagnosis • demanding for no- switching- off of operation voltage during the testing leads to non classical measurement methods (UHF- measurement by special pd- probes)

  18. if into the switchgear a capacitive sensor is available, so by using a special pd- probe sensitive PD- on site- tests can be provided • the measuring sensitivity can be increased significantly by using of appropriate resonance elements like cabel- parts • this testing arrangement can be used in principle even for similar configurations.

  19. Thank you -- dekuji za pozornost Questions ?  Answers !

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