Breaker Operation & Maintenance

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In-Country Training On Operation, Maintenance, Protection & Control of 33/11 kV Substation Project Name: Design, Supply, Installation, Testing & Commissioning of 33/11 kV sub-stations with source end feeder bays.   Contract No: BREB/UREDS/W-01A-001/02/2016-2017 BREB/UREDS/W-01A-002/03/2016-2017 BREB/UREDS/W-01A-004/04/2016-2017
Transcript
  • 1. PRESENTATION ON BREAKER
  • 2. TRANING ON  11 KV BREAKER WITH PANEL  33 KV INDOOR BREAKER WITH PANEL  33 KV OUTDOOR BREAKER  RELAY SETTING TOOLS  SHORT VISIT ON RMU
  • 3. HOW BREAKER WORKS? A mechanical device capable of making, carrying and breaking currents under normal conditions as well as under specified abnormal conditions such as those of short circuit. Fault Occurs Relay • Senses & Relay Contact Closes Circuit Breaker • Trip Coil Energises • Operating Mechanism Starts • Contacts Separate • Arcing between Contacts • Arc Extinguishes • Circuit Breaker Fully Opens Fault Cleared
  • 4. BREAKER INTERUPTING
  • 5. Interrupting media – Oil – Air Break – Air Blast – Vacuum – SF6 Puffer – SF6 Self Blast
  • 6. Dielectric Property Of Various Media 10 Electrode spacing [mm] 20 30 300 250 200 150 100 50 0 -- SF6 (5 Bar) Vacuum Oil -- SF6(1 Bar) Air(1 Bar) Disruptivelighteningimpulsevoltage[kV]
  • 7. Dielectric Recovery Property Of Various Media 101 0 20 40 100 1000 SF6 10000 60 80 Vacuum N2 H2 Time [micro-seconds] Dielectricrecoveryvoltage[kV]
  • 8. Interruption Principle PUFFER TYPE:  Involves compression of gas between a static piston and a moveable cylinder during interruption action.  Compressed gas is blown through nozzle in which arc is burning. SELF EXTINGUISHING TYPE:  Heat/ionization effect of arc causes gas pressure to increase in sealed arc chambers.  Over pressure causes turbulence in gas and forces it out as soon as nozzle starts to open.  This phenomena has strong effect on arc, making it thinner, cooling, interrupting and providing rapid dielectric recovery
  • 9. Puffer principle
  • 10. Vacuum Interrupter 1 Stem / Terminal 2 Twist protection 3 Bellows 4 Interrupter lid 5 Shield 6 Ceramic insulator 7 Shield 8 Contacts 9 Terminal 10 Interrupter lid
  • 11. Interruption Principles SPIRAL CONTACTS * To prevent overheating and contact erosion, the arc is kept rotating *The special geometry of the spiral contacts generates a radial magnetic field in all the areas of the arc column
  • 12. Motor Switching with VCB  ARC EXTINCTION AT CURRENT ZERO IS NOT POSSIBLE.  (MIN +/-5A FOR ALL MANUFACTURERS)  CURRENT CHOPPING IS IN EVITABLE FOR INDUCTIVE LOADS  I.E.SPECIFICALLY MOTORS WITH LOW LOAD CURRENTS(e.g.NO LOAD)  MOTOR HARMONICS GIVES RISE TO VIRTUAL CURRENT CHOPPING Better solution with SF6 CB
  • 13. Capacitor Switching with VCB  CAPACITOR SWITCHING AT LOWER CURRENT IS DIFFICULT WITH VCB BECAUSE…..  GAP BETWEEN MOVING CONTACT AND FIXED CONTACT IS VERY LESS (8-10MM APPROX).CONTACT SPEED IS ALSO LOW (1M/S.APPROX)  AT LOWER CAPACITTIVE CURRENTS, ARC EXTENGUISHES EARLY WITH HIGH RESTRIKING VOLTAGE (VOLTAGE OF CAP IN ADDITION) ACROSS CONTACTS WITH A GAP OF 2MM APPROX. Result  Multiple restrikes hinders smooth switching of capacitors and capacitor as well as VCB contacts may damage Better solution with SF6 CB
  • 14. SF6 & VACUUM SWITCHING TECHNOLOGIES  SF6 CIRCUIT BREAKER VACUUM CIRCUIT BREAKER  SF6 GAS PRESSURE MONITORING VACUUM CAN NOT BE MONITORED. POSSIBLE.  FALL IN PRESSURE CAN BE ANNUNCIATED. LOSS OF VACUUM WILL BE KNOWN WITH  CB FAILURE.  CAN INTERRUPT RATED CURRENT EVEN HAS TO BE TAKEN OUT FOR  AFTER GAS PRESSURE FALLS DOWN TO REPLACEMENT OF POLES.  ATMOSPHEREIC PRESSURE.  GOOD ELECTRICAL ENDURANCE. GOOD ELECTRICAL ENDURANCE.  INTERRUPTING CHAMBERS CAN BE INTERRUPTERS TO BE REPLACED (COST OF  MAINTAINED. REPLACEMENT 40% OF CB ).  SF6 BREAKER IS RUGGED. SENSETIVE TO ROUGH HANDLING.  WELL SUITED TO MOTOR DUTY OPERATIONS RELATIVEY INFERIOR FOR MOTOR  OVER VOLTAGE UNDER 2.5P.U. SWITCHING. SURGE PROTECTION ESSENTIA
  • 15. WHAT IS IPXX
  • 16. 11 KV BREAKER (HHV-12) Contacts protected against oxidation and contamination  Vacuum interrupter embedded in the resin poles  Vacuum interrupter protected against shocks, dust and humidity  Ensured operation under different climatic conditions  Limited switching energy  High number of operations  Operating mechanism with high reliability
  • 17. HHV-12 CUBICLE CROSS SECTIONAL DWG
  • 18. EARTHING SWITCH
  • 19. Outdoor Vacuum Circuit Breaker OFVP 36  10000 operations at no load.  10000 operations at rated current.  Wide range of power supply voltages of the electrical accessories.  Mechanical anti-pumping device to prevent re-closing due to both electrical and mechanical controls.  Uses Hermetically sealed interrupters.  Cabinet mounted on Hot-Dip Galvanised steel structure.  Option to extend structure for instrument transformers.
  • 20. IMPROVE OUR BREAKER  DOOR INTERLOCK
  • 21. ALWAYS THINK !!!!!!!!  RIGHT POSITION
  • 22. THANK YOU
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