bus2000 busbar differential protection system · (6 feeders) differential protection. 32 industrial...
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Industrial Systems
BUS2000 Busbar Differential Protection SystemDifferential overcurrent system with
percentage restraint protection
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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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Typical Single BusbarArrangement
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Typical Double Busbarwith Coupler Arrangement
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Typical Breaker and a Half Arrangement
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Typical Double BreakerBusbar Arrangement
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Typical Double Busbarwith Transfer Bar
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Typical Segregated Busbarwith Coupler
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Types of Protection Schemes
–Low Impedance–High Impedance
• Medium Values• High Values
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Low Impedance Protection
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Saturation of the AuxiliaryCTs
• A. Primary Fault Current• B. Secondary Current from the Source CTs• C. Secondary Current in the Faulty CT• D. Differential Current
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Low Impedance Protection Current Detection + Second
Criteria–Time-delayed Overcurrent Relays–Directional Overcurrent Relays –Restraint Overcurrent relays–CT Saturation Detectors
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High Impedance ProtectionScheme
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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
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Industrial SystemsDifferential Overcurrent Relay with Percentage Restraint & Stabilizing
Resistor
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BUS2000-External Fault
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BUS2000-Internal Fault
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BUS2000 - Differential Unit Block Diagram
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BUS2000-Sensitivity Algorithm (1)
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BUS2000-Sensitivity Algorithm (2)
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BUS2000-Sensitivity Algorithm (3)
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External Fault with CT Saturation
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BUS2000-Stability Algorithm
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BUS2000-Stability Limit
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BUS2000-Operation Characteristic
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BUS2000-Auxiliary CT. Magnetizing Curve of the Secondary Side
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BUS2000-Alarm Unit Block Diagram
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Breaker Failure Block Diagram
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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
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Numerical Monitoring Module (cont)
– Oscillography Waveform Capture– Event Record– RS232 or fiber optics Communications– Configurable I/O– Undervoltage Supervision
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BUS2000-Single Busbar(6 feeders) Differential Protection
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BUS2000-Overcurrent and Breaker Failure (5 feeders) Protection
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BUS2000-Test Rack
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BUS2000-Numerical Monitoring Module
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External Connections Diagram of Single Busbar BUS2000
System
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BUS2000-Settings–K for Sensitivity–K and RE as low as possible–RE for CT requirements for
Overvoltage Conditions
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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
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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