Gunnar Stranne Busbar protection REB 670 Rio de Janeiro April 23-25, 2006 ABB Power Technologies AB
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4 REB 500 is enabled for use with IEC61850 communication
Benefits of REB 670 outstanding features 5 Very fast, minimum operating time 10 ms Extremely stable for external faults Additional sensitive differential protection Smart open CT detection One or two protection zones and check zone Phase segregated Very low CT requirements Any CT ratio difference can be accommodated Settings entered directly in primary amperes The I/O is flexible and extendable Easy extension
Application Areas for REB 670 Differential protection, BFR & Non-Dir OC Protection for: Busbars Meshed corners, T-protection 6
Pre-configured REB 670 Ready To Use Three-phase versions REB 670-A20 for 4 bays 2 zones REB 670-A31 for 8 bays 2 zones Single phase and summation three-phase versions REB 670-B20 for 12 bays 2 zones REB670-B21 for 12 bays 2 zones REB670-B31 for 24 bays 2 zones 7
REB 670 Preconfigured Versions 3-Phase Version Two measuring zone BFR, OC, EnFP & AR 4 or 8 bays 1-Phase Version Two measuring zones 8 BFR, OC, EnFP & AR 12 or 24 bays One terminal per phase Summation
Three-Phase Terminal - 4-8 Bays - Double Zone REB 670 A31 2 Zones (A & B); 8 Bays Application Areas: Smaller Buses (up to 8 CTs per zone) Single Busbar Stations (with Transfer Bus) 1½ Breaker Stations Double Busbar Stations (with Transfer Bus) Zone Interconnection included in the design No switching of CT secondary circuits 9
REB 670 3-Phase - Basic applications Diff & CBF M/G Auto-Transformer Generator/Motor Capacitor Reactor 10
REB 670 3- Phase - BBP, BFP & EnFP for single buses ZB Single Busbar up to 4/8 feeder bays Single Bus with bus tie CB up to 3/7 feeder bays on each side ZB 11 H type station with bus-section CB or sectionalizing disconnector Alternative CT Location ZB T connections
REB 670 3- Phase - BBP, BFP, EnFP for 1½ CB stations ZB 1½ Breaker Stations up to 4 diameters 12 ZB 1½ Breaker Stations up to 8 diameters
REB 670 3- Phase - BBP, BFP & EnFP for Double CB stations ZB Double Breaker Station up to 8 feeders Alternative CT Location 13
REB 670 1- Phase - BBP, BFP & EnFP for double buses ZB Double Bus with bus-coupler CB and up to 6/7 feeder bays ZB Transfer Bus Transfer Bay Isolator replica in REB 670*1.0 by configuration 14 Double Busbars with bus coupler CB and Transfer Bus up to 6/7 feeder bays Optional Measuring Point
Scheme Layout for Double Busbar; 2 Zones/7 feeders 700 ABB EQUIPMENT INCLUDED in the PANEL: 1 pcs 3 phase, Busbar protection terminal REB 670*1.0 - two differential zones - check zone - eight CB failure relays - eight OC feeder backup protection (EnFP) - internal disconnector replica logic - internal individual bay tripping logic - disconnector status supervision 15
Single-Phase Terminal REB670 B21/B31; 12/24 Bays- Double Zone REB 670; Ph-L1 2 Zones (A & B); 24 Bays REB 670; Ph-L2 2 Zones (A & B); 24 Bays REB 670; Ph-L3 2 Zones (A & B); 24 Bays Application Areas: Bigger Buses (up to 12/24 bays per zone) Single Busbar Stations (with Transfer Bus) 1½ Breaker Stations Double Busbar Stations (with Transfer Bus) Load Transfer is included into the design 3 Terminals required for complete scheme LDCM available to share binary IO No switching of CT secondary circuits 16
REB 670 1- Ph; BBP, BFP & EnFP for single buses ZB Single Bus up to 12/24 feeder bays Single Bus with bus-section disconnector up to 12/24 feeder bays (i.e. 12+12; 16+8 etc.) ZB ZB Single Bus with bus-section CB, up to 11/23 feeder bays (i.e. 12+11; 10+13 etc.) 17 Single Bus with bus-section CB up to 11/23 feeder bays on each side
REB 670 1- Phase - BBP applications for 1½ CB stations ZB 1½ Breaker Stations up to 6 / 12 diameters ZB 1½ Breaker Stations up to 12 / 24 diameters 18
REB 670 1- Phase - BBP, CBF & EnFP for 1½ CB Stations! ZB Bus Diff, CB Fail & EnFP 1½ Breaker Stations up to 4/8 diameters 19
REB 670 1- Ph; BBP, BFP & EnFP for Double CB stations ZB Double Breaker Station up to 6 / 12 feeders ZB Double Breaker Station up to 12 / 24 feeders Alternative CT Location 20
REB 670 1- Ph; BBP, BFP & EnFP for double buses ZB Double Bus with bus-coupler CB up to 22/23 feeder bays 21 Isolator replica in REB 670*1.0 by CAP 531 Configuration Optional Measuring Point
REB 670 1- Ph; BBP, BFP & EnFP for double bus & transfer ZB Transfer Bus Combined Bus-Coupler & Transfer Bay ZB Transfer Bay Bus-Coupler Bay 22 Transfer Bus Double Busbars with Transfer Bus up to 22/23 feeder bays Isolator replica in REB 670*1.0 by CAP 531 Configuration
Scheme Layout for Double Busbar; 2 Zones/22 feeders 700 ABB EQUIPMENT INCLUDED in the PANEL: 3 pcs 1 phase, Busbar protection terminal REB 670*1.0 - two differential zones - check zone - 24 CB failure relays - 24 OC feeder backup protection (EnFP) - internal disconnector replica logic - internal individual bay tripping logic - disconnector status supervision 23
REB 670 1-Phase version - for double buses Main 1 Reserve 1 Main 2 Reserve 2 Four Zone Double Bus with two bus-coupler CBs and two bus-section CBs and up to 20/21 feeder bays on each station side. BBP, BFP & EnFP included Main 1 Reserve 1 Main 2 Reserve 2 Four Zone Double Bus with two BC-CBs one BS-CB and one sectionalizing disconnector with up to 18-20 feeder bays in the whole station 24 Optional Measuring Point
REB 670 1-phase version summation transformers REB 670; 1 Ph 2 Zones (A & B); 24 Bays + N times Buses up to 24 bays per zone Single Busbar 1½ Breaker Systems Double Busbar Same applications possible as for 1Ph solution Software Driven Zone Selection Cost effective Solution 25 N 8
REB 670 Allocation of Software Functionality 26 Zone Selection Dynamic Software CT switching (i.e. no switching in CT secondary circuits neither interposing CTs are required) Easy adaptation to different substation layouts such as: single or double bus (with transfer bus), one-and-half or double breaker, etc. Simple adaptation to buses with only one set of CTs in the bussection or bus-coupler bays Selective BBP & BFP tripping for every bay Merging of the two differential zones when required (i.e. during load transfer in double busbar stations) Disconnector and/or circuit breaker status supervision Differential Zones High speed tripping for internal faults. Typical operating time 12 ms Complete stability for through faults, with heavy CT saturation, and a maximum remanence in the CT core at auto-reclosing Low CT requirement, only 2 milliseconds to saturation needed for correct operation Intelligent detection for open or shorted CT secondary circuits and settable blocking of differential protection zone Sensitive differential protection stage for power systems with limited earth-fault current
REB 670 Software Structure / Function Blocks Zone Selection Primary Switchgear Objects Status (i.e. disconnector and breakers) Bay (Interface towards one Primary Bay) Zone Interconnection (Merging of two zones when required) Differential Zones Zone A (Id>, OCT, Sensitive Id>) Zone B (Id>, OCT, Sensitive Id>) Check Zone (Id>) 27 One Basic Function in AFL, Hidden connections exist
Differential Protection in REB 670 Very fast, minimum operating time 10 ms Extremely stable for external faults Completely phase segregated measurement Differential algorithm not dependent on the number of connected feeders Very low CT requirements, only 2 ms before CT saturation Any CT ratio difference can be accommodated Settings entered directly in primary amperes I d [Primary Amps] I d =I in Operate region Diff Oper Level Sensitive Oper Level 28 s=0.53 I in [Primary Amps] Differential protection operation characteristic
Sensitive Differential Protection in REB 670 Used in low impedance earthed power system or in other special applications It has the following characteristics: Freely settable characteristic with time delay possibility Automatically blocked for heavy ph-to-ph faults External release via binary signal (i.e. from open delta voltage, transformer neutral point current, etc.) I d [Primary Amps] I d =I in Operate region Diff Oper Level Sensitive Oper Level 29 s=0.53 Sensitive differential protection I in [Primary Amps] Differential protection operation characteristic en04000260.vsd
Open CT detection for REB 670 Slow and Fast Open CT detection Settable influence of slow and fast open CT logic: Off (switched off) Block (differential protection) Supervise (Doesn't block, just increase minimum differential operation level as shown below) I d [Primary Amps] I d =I in Operate region OCT Logic Supervision Level Diff Oper Level Sensitive Oper Level 30 s=0.53 Sensitive differential protection I in [Primary Amps] Differential protection operation characteristic en04000260.vsd
Check Zone in REB 670 Independent check zone available Can be switched off (default setting) Freely settable which CTs shall be connected to check zone Provide stability in case of problem with disconnector auxiliary contacts ( stuck contacts or wiring problems) I d [Primary Amps] Operate region 31 Oper Level s=0.0-0.90 (settable) I out [Primary Amps]
Zone Supervision in REB 670 Two new types of Diff Zone supervision are available Id> traditional supervision of differential current level with settable time delay(i.e. can be used as alarm or for automatic reset of OCT condition) Iin> incoming current supervision, without time delay (i.e. can be used to trigger DR for external faults) 32
Disconnector/CB supervision & alarming For every disconnector/cb status is determined from the status of aux contacts (i.e. a & b contacts) Two schemes available depending on philosophy, a or b or both Position of a disconnector/cb can be forced to OPEN or CLOSED by a parameter setting 33
User Features in REB 670 (3-Ph & 1-Ph) Easy to set, configure, install & use Pre-configured for most typical substation layouts Bay connection matrix built-in (large HMI) Switchgear Status Matrix (large HMI) 34
Bay-Connections & Switchgear Status Matrices 35 User Settable Bay Name Internally Used Bay FB Connections to internal zones User Settable Switchgear Names Switchgear Object Status
Breaker Failure Protection Complete breaker failure protection with: 1ph and/or 3ph starting Re-trip after a set time delay Backup trip / bus-strip (i.e. second time delay) Short reset time of 15ms Trips CBs via busbar disconnector replica Integrated station wide trip logic available from Zone Selection 36
Phase Overcurrent function 4 3I> I F Four, non-directional phase overcurrent stages Each stage can be Definite- or Inverse time delayed. 19 IEC/ANSI curves Logarithmic inverse Tailor made curve is available Each stage can be separately blocked with second harmonic 4 th stage can be used for end fault protection 37
End Fault Protection CB=Clearing Boundary Busbar Protection CT=Measuring Boundary Busbar Protection Feeder Protection Feeder Protection When feeder CB is open, stop measuring boundary at the open CB contacts in order to avoid over-trip and activate fast OC protection to trip 2006-04-20 remote Gunnar Stranne end Aonly 38 Over-Trip Zone Under-Trip Zone When feeder CB is open, extend measuring boundary to the open CB contacts in order to avoid under-trip
Autoreclosing Function Only used in certain markets in order to try to re-energize the bus after BBP trip One AR function per Differential Zone is available 39
Summary - REB 670 busbar protection 40 Complete and fast differential protection (10-12ms) One or two protection zones and check zone Extremely stable for external faults Additional sensitivity Low CT requirements - open CT detection any CT ratio Advanced zone selection & integrated zone interconnection Disconnector and/or CB position supervision & alarming CB failure and 4-stage backup overcurrent protection Disturbance and event recording Preconfigured versions with flexible and extendable I/O Easy extension