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HV CB testing.pdf
- 1. Jaafar Aldurazi Sales & Application Engineer Live demo on TRAX part 5 : HV Circuit breaker testing (Contact resistance, Timing, Coil current)
- 2. Presenter Jaafar Aldurazi • Applications Engineer • Megger Middle East, Bahrain Today’s Presenter
- 3. Send us your questions and comments during the presentation Q&A
- 4. • 11am ( + 3 GMT ) ( 1 hour duration ) • 2nd July : WRM , TTR & Demag • 6th July : SCI , FRSL & Magnatic Balance • 13th July : Insulation Tan Delta test • 20th July : CT Tests ( Knee point , WRM & Ratio V & I, burden ) • Today :CB testing ( Timing , Coil current & CRM ) Monday Weekly Webinars Live Demonstrations of Trax Tests
- 5. Scan QR code using Mobile Camera Part 1 WRM Demag TTR Part 2 SCI FRSL Magnetic Balance
- 6. Scan QR code using Mobile Camera Part 3 Tan Delta DFR Tip Up Part 4 Timing for CB Coil current of CB Contact resistance
- 7. Cirecuit Breakers Fundamental Testing requirments Live testing using TRAX220 + Substation Software Agenda
- 8. Low Voltage CBs • Below 1000V • Will trip on own when there is too much current • Timing test is performed via current injection at actual current levels Medium/High Voltage CBs • Greater than 1000V • Cannot trip on own, needs external signal to trip • Timing test performed via time and travel analyzer at low currents Cirecuit Breakers Fundamental
- 9. 4 Typical Circuit Breaker-Single break per phase The contact is operated by mechanically separating the contacts. Common insulation media are oil, air, vacuum and SF6. Open and close operations are obtained by releasing energy stored in a spring. The spring is controlled by a coil and charged by a electrical motor. Connector CB chamber where the contact is Operating mechanism and control unit, auxiliary contacts, spring. Isolation to earth Connector
- 10. 5 Typical Circuit Breaker-Multiple breaks per phase Grading capacitors in parallel to divide voltage equally. Synchronization is important. Connector Connector One contact can not break 400 kV under load. CB chamber where the contact is Isolation to earth Operating mechanism and control unit, auxiliary contacts, spring.
- 11. Gas Insulated switchgear (GIS) Everything is inside Gas Champers (Usually SF6 GAS) Compact , usually Fitted indoors Slightly Difficult for Maintenance operations When Energized Substation only access through Earth links Operating mechanism and control unit CB Chambers Earth Links
- 12. Medium Voltage (MV) Circuit Breakers Usually from 400 V to 40 kV Application Compact , usually Fitted in Cabinets Ability to Rack Out of Cabinets for Maintenance CB Chambers Operating mechanism and control unit
- 13. 10 Circuit Breaker Testing Basic Contact resistance Contact timing Travel (stroke, speed, damping, penetration) Operating coil current Minimum trip voltage Advanced (diagnostic) Dynamic Resistance Measurement First Trip Test (On-Line) Special Pressure (air blast breakers) Vacuum check (vacuum breakers) SF6 related Tests (Purity , Pressure , Etc) Insulation Tests
- 14. 11 Contact Resistance Verify low contact resistance (micro ohm). High current for accuracy. Test current (DC): • Minimum 100 A (IEEE) • IEC standard requires a current of at least 50 ADC • +10% of rated current (recommended)
- 15. 12 Contact Resistance 4-wire method >100 A 28 µΩ Generate high current with 2 leads and measure voltage drop with 2 separate leads. Ability to Do Dual Ground
- 16. 13 Contact Timing Close/open time also CO, O-C , O-CO • Values are usually available in the CB manual Breaker synchronization (phase vs. phase) • < 1/4 cycle @ close operation (IEC62271-100) • < 1/6 cycle @ open operation (IEC62271-100) Phase synchronization (interrupters inside phase) • < 1/8 cycle (IEC62271-100) Correct timing between main & resistor contact(PIR Contacts) Aux contacts lead/lag time
- 18. 17 Trip/CloseCoil Measurement Recording the coil currents during breaker operation Armature time(coil Time) Max current Duration Coil Resistance Voltage During Operation
- 19. 18 Coil Current Trace Mechanism Release Open Coil motion Main Contacts motion Mechanism Motion |--------Coil Motion---------- | Locked Open comma nd ----------Auxiliary contact opened---------- | -------------Mechanism Motion------------- | Detect Coil time vs Mechanism Time Bad Coil or Bad Mechanism No additional clamp needed Control module direct measures Current recordin g
- 20. 19 Minimum Operating Voltage Verify that the breaker operates at the minimum voltage (IEC 60694) • CLOSE: 85% of rated operating voltage (AC/DC) • OPEN: 70% of rated operating voltage (DC) • OPEN: 85% of rated operating voltage (AC)
- 21. 11am ( + 3 GMT ) ( 1 hour duration ) 2nd July : WRM , TTR & Demag 6th July : SCI , FRSL & Magnatic Balance 13th July : Insulation Tan Delta test 20th July : CT Tests ( Knee point , WRM & Ratio V & I, burden ) Today :CB testing ( Timing , Coil current & CRM ) Monday Weekly Webinars Live Demonstrations of Trax Tests
- 22. Scan QR code using Mobile Camera Part 1 WRM Demag TTR Part 2 SCI FRSL Magnetic Balance
- 23. Scan QR code using Mobile Camera Part 3 Tan Delta DFR Tip Up Part 4 Timing for CB Coil current of CB Contact resistance
- 24. 25 Advanced Testing Unit Webinar - Introduction to HV CB testing. Products, testing functions, features,benefits By Ali Husain
- 25. Live Demo We Need TRAX unit + Substation testing Software activated Test Object 1- BRS – Breaker Simulator - 1x break per phase - Common mechanism Test Conducted 1-Timing 2- Coil current 3- Contact Resistance
- 26. • One Connection for : - Timing measurement - Coil current Measurement Connection of TRAX to CB
- 27. Questions?
- 28. Send us your questions and comments during the presentation Q&A
- 29. Contact Information Presenter Jaafar Aldurazi Jaffer.aldurazi@megger.com Survey and Contact Information