bus2000 busbar differential protection system - ge digital energy
TRANSCRIPT
1
Industrial Systems
BUS2000 Busbar Differential Protection SystemDifferential overcurrent system with
percentage restraint protection
2
Industrial Systems
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
Industrial Systems
Typical Single BusbarArrangement
4
Industrial Systems
Typical Double Busbarwith Coupler Arrangement
5
Industrial Systems
Typical Breaker and a Half Arrangement
6
Industrial Systems
Typical Double BreakerBusbar Arrangement
7
Industrial Systems
Typical Double Busbarwith Transfer Bar
8
Industrial Systems
Typical Segregated Busbarwith Coupler
9
Industrial Systems
Types of Protection Schemes
–Low Impedance–High Impedance
• Medium Values• High Values
10
Industrial Systems
Low Impedance Protection
11
Industrial Systems
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
12
Industrial Systems
Low Impedance Protection Current Detection + Second
Criteria–Time-delayed Overcurrent Relays–Directional Overcurrent Relays –Restraint Overcurrent relays–CT Saturation Detectors
13
Industrial Systems
High Impedance ProtectionScheme
14
Industrial Systems
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
Industrial SystemsDifferential Overcurrent Relay with Percentage Restraint & Stabilizing
Resistor
16
Industrial Systems
BUS2000-External Fault
17
Industrial Systems
BUS2000-Internal Fault
18
Industrial Systems
BUS2000 - Differential Unit Block Diagram
19
Industrial Systems
BUS2000-Sensitivity Algorithm (1)
20
Industrial Systems
BUS2000-Sensitivity Algorithm (2)
21
Industrial Systems
BUS2000-Sensitivity Algorithm (3)
22
Industrial Systems
External Fault with CT Saturation
23
Industrial Systems
BUS2000-Stability Algorithm
24
Industrial Systems
BUS2000-Stability Limit
25
Industrial Systems
BUS2000-Operation Characteristic
26
Industrial Systems
BUS2000-Auxiliary CT. Magnetizing Curve of the Secondary Side
27
Industrial Systems
BUS2000-Alarm Unit Block Diagram
28
Industrial Systems
Breaker Failure Block Diagram
29
Industrial Systems
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
Industrial Systems
Numerical Monitoring Module (cont)
– Oscillography Waveform Capture– Event Record– RS232 or fiber optics Communications– Configurable I/O– Undervoltage Supervision
31
Industrial Systems
BUS2000-Single Busbar(6 feeders) Differential Protection
32
Industrial Systems
BUS2000-Overcurrent and Breaker Failure (5 feeders) Protection
33
Industrial Systems
BUS2000-Test Rack
34
Industrial Systems
BUS2000-Numerical Monitoring Module
35
Industrial Systems
External Connections Diagram of Single Busbar BUS2000
System
36
Industrial Systems
BUS2000-Settings–K for Sensitivity–K and RE as low as possible–RE for CT requirements for
Overvoltage Conditions
37
Industrial Systems
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
Industrial Systems
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