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BUS2000 Busbar Differential Protection System

BUS2000 Busbar Differential Protection System. Differential overcurrent system with percentage restraint protection. Typical Busbar Arrangements. Single Busbar Double Busbar with Coupler Breaker and a Half Double Breaker Double Busbar with Transfer Bar Segregated Busbars with Coupler.

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BUS2000 Busbar Differential Protection System

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  1. BUS2000 Busbar Differential Protection System Differential overcurrent system with percentage restraint protection

  2. Typical Busbar Arrangements • Single Busbar • Double Busbar with Coupler • Breaker and a Half • Double Breaker • Double Busbar with Transfer Bar • Segregated Busbars with Coupler

  3. Typical Single Busbar Arrangement

  4. Typical Double Busbar with Coupler Arrangement

  5. Typical Breaker and a Half Arrangement

  6. Typical Double Breaker Busbar Arrangement

  7. Typical Double Busbar with Transfer Bar

  8. Typical Segregated Busbar with Coupler

  9. Types of Protection Schemes • Low Impedance • High Impedance • Medium Values • High Values

  10. Low Impedance Protection

  11. Saturation of the Auxiliary CTs • A. Primary Fault Current • B. Secondary Current from the Source CTs • C. Secondary Current in the Faulty CT • D. Differential Current

  12. Low Impedance Protection Current Detection + Second Criteria • Time-delayed Overcurrent Relays • Directional Overcurrent Relays • Restraint Overcurrent relays • CT Saturation Detectors

  13. High Impedance ProtectionScheme

  14. High Impedance Protection • WHERE: • RL= CONNECTION WIRES RESISTANCE • IF = SECONDARY RMS CURRENT VALUE IN TI3 • VR = DIFFERENTIAL RELAY VOLTAGE • VS = CT MINIMUM SATURATION VOLTAGE • VOP = OPERATION VOLTAGE • VR = IF x (2RL + RS) • VOP > VR Stability Criteria • VS > VOP Operation Criteria • TI3 Totally Saturated • RS CT Secondary Winding R Value

  15. Differential Overcurrent Relay with Percentage Restraint & Stabilizing Resistor

  16. BUS2000-External Fault

  17. BUS2000-Internal Fault

  18. BUS2000 - Differential Unit Block Diagram

  19. BUS2000-Sensitivity Algorithm (1)

  20. BUS2000-Sensitivity Algorithm (2)

  21. BUS2000-Sensitivity Algorithm (3)

  22. External Fault with CT Saturation

  23. BUS2000-Stability Algorithm

  24. BUS2000-Stability Limit

  25. BUS2000-Operation Characteristic

  26. BUS2000-Auxiliary CT. Magnetizing Curve of the Secondary Side

  27. BUS2000-Alarm Unit Block Diagram

  28. Breaker Failure Block Diagram

  29. Numerical Monitoring Module • Differential and Restraint Currents Metering Information • Full Human-Machine Interface (Keypad + Graphic Display) • IRIG-B Time Synchronization • Alarm Treatment • Differential Protection Outputs Status

  30. Numerical Monitoring Module (cont) • Oscillography Waveform Capture • Event Record • RS232 or fiber optics Communications • Configurable I/O • Undervoltage Supervision

  31. BUS2000-Single Busbar (6 feeders) Differential Protection

  32. BUS2000-Overcurrent and Breaker Failure (5 feeders) Protection

  33. BUS2000-Test Rack

  34. BUS2000-Numerical Monitoring Module

  35. External Connections Diagram of Single Busbar BUS2000 System

  36. BUS2000-Settings • K for Sensitivity • K and RE as low as possible • RE for CT requirements for Overvoltage Conditions

  37. Key Advantages • Flexibility • Independent setttings for K and RE done in the field without any additional changes • Wide Setting Range • Suitable for all kinds of installations • Measurement Units Supervision • Current Circuits Supervision

  38. Key Advantages (cont’d) • Single-Three Phase Breaker Failure • Test Rack Independent from the protection • Easy Commisioning (accesible terminal blocks) • Suitable for updating of old Substations • Operating Principles well proven in the field • Numerical Monitoring Module

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