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AB
B P
ower
Tec
hnol
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s A
B
2006-04-20 Gunnar Stranne A
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Rio de JaneiroApril 23-25, 2006
Busbar protection REB 670
Gunnar Stranne
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2006-04-20 Gunnar Stranne A
REB 500 is enabled for use with IEC61850 communication
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2006-04-20 Gunnar Stranne A
Benefits of REB 670 – outstanding features
� 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
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2006-04-20 Gunnar Stranne A
Application Areas for REB 670
� Differential protection, BFR & Non-Dir OC Protection for:
� Busbars� Meshed corners, � T-protection
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� 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
Pre-configured REB 670 Ready To Use
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� 3-Phase Version
� Two measuring zone
� BFR, OC, EnFP & AR� 4 or 8 bays
� 1-Phase Version
� Two measuring zones
� BFR, OC, EnFP & AR� 12 or 24 bays� One terminal per phase� Summation
REB 670 Preconfigured Versions
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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
Three-Phase Terminal - 4-8 Bays - Double Zone
No switching of CT secondary circuitsNo switching of CT secondary circuits
REB 670 – A312 Zones (A & B); 8 Bays
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2006-04-20 Gunnar Stranne A
Capacitor Reactor
REB 670 3-Phase - Basic applications Diff & CBF
M/G
Generator/MotorAuto-Transformer
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REB 670 3- Phase - BBP, BFP & EnFP for single buses
Single Bus with bus tie CBup to 3/7 feeder bays on each side
ZA ZBZA
Single Busbarup to 4/8 feeder bays
T connections
ZA
ZB
Alternative CT Location
H type station with bus-section CBor sectionalizing disconnector
ZA ZB
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REB 670 3- Phase - BBP, BFP, EnFP for 1½ CB stations
1½ Breaker Stationsup to 4 diameters
ZA
ZB
1½ Breaker Stationsup to 8 diameters
ZA
ZB
.. .
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REB 670 3- Phase - BBP, BFP & EnFP for Double CB stations
Alternative CT Location
Double Breaker Stationup to 8 feeders
ZA
ZB
.. .
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REB 670 1- Phase - BBP, BFP & EnFP for double buses
Isolator replica in REB 670*1.0 by configuration
Double Bus with bus-coupler CBand up to 6/7 feeder bays
ZB
ZA
.. .
Optional Measuring Point
Double Busbars with bus coupler CB and Transfer Busup to 6/7 feeder bays
ZB
ZA
Transfer Bus
Transfer Bay
.. .
.. .
.. .
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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
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Scheme Layout for Double Busbar; 2 Zones/7 feeders
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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
Single-Phase Terminal REB670 – B21/B31; 12/24 Bays- Double Zone
No switching of CT secondary circuitsNo switching of CT secondary circuits
REB 670; Ph-L32 Zones (A & B); 24 Bays
REB 670; Ph-L22 Zones (A & B); 24 Bays
REB 670; Ph-L12 Zones (A & B); 24 Bays
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REB 670 1- Ph; BBP, BFP & EnFP for single buses
Single Busup to 12/24 feeder bays
ZA.. .
Single Bus with bus-section disconnectorup to 12/24 feeder bays (i.e. 12+12; 16+8 etc.)
ZA ZB.. . .. .
Single Bus with bus-section CBup to 11/23 feeder bays on each side
ZA ZB.. . .. .
Single Bus with bus-section CB, up to11/23 feeder bays (i.e. 12+11; 10+13 etc.)
ZA ZB.. ... .
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REB 670 1- Phase - BBP applications for 1½ CB stations
1½ Breaker Stations up to 12 / 24 diameters
ZA
ZB
.. .
1½ Breaker Stationsup to 6 / 12 diameters
ZA
ZB
.. .
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REB 670 1- Phase - BBP, CBF & EnFP for 1½ CB Stations!
Bus Diff, CB Fail & EnFP1½ Breaker Stations up to 4/8 diameters
ZA
ZB
.. .
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Alternative CT Location
REB 670 1- Ph; BBP, BFP & EnFP for Double CB stations
Double Breaker Stationup to 6 / 12 feeders
ZA
ZB
.. .
ZA
ZB
Double Breaker Stationup to 12 / 24 feeders
.. .
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2006-04-20 Gunnar Stranne A Optional Measuring Point
REB 670 1- Ph; BBP, BFP & EnFP for double buses
Double Bus with bus-coupler CBup to 22/23 feeder bays
ZB
ZA
.. .
Isolator replica in REB 670*1.0 by CAP 531 Configuration
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REB 670 1- Ph; BBP, BFP & EnFP for double bus & transfer
Double Busbars with Transfer Busup to 22/23 feeder bays
ZB
ZA
Transfer Bus
Transfer Bay
.. .
.. .
.. .
Bus-Coupler Bay
ZB
ZA
Transfer Bus
Combined Bus-Coupler & Transfer Bay
.. .
.. .
.. .
Isolator replica in REB 670*1.0 by CAP 531 Configuration
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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
700
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Scheme Layout for Double Busbar; 2 Zones/22 feeders
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REB 670 1-Phase version - for double buses
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
Optional Measuring Point
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
Reserve 2
Main 2
Reserve 1
Main 1
.. ... .
Reserve 2
Main 2
Reserve 1
Main 1
.. ... .
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� 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
REB 670; 1 Ph2 Zones (A & B); 24 Bays
+ N + N timestimes
N N ≤≤≤≤≤≤≤≤ 88
REB 670 1-phase version summation transformers
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REB 670 Allocation of Software Functionality
� 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 bus-section 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
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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>)
One Basic Function in AFL,
Hidden connections exist
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� 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
Differential Protection in REB 670
Differential protectionoperation characteristic
Operateregion
Diff Oper Level
I d [P
rimar
y A
mps
]
Iin [Primary Amps]
s=0.53
I d=I in
Sensitive Oper Level
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� 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.)
Sensitive Differential Protection in REB 670
Differential protectionoperation characteristic
Operateregion
Diff Oper Level
I d [P
rimar
y A
mps
]
Iin [Primary Amps]
s=0.53
I d=I in
Sensitivedifferentialprotection
en04000260.vsd
Sensitive Oper Level
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Differential protectionoperation characteristic
Operateregion
Diff Oper Level
I d [P
rimar
y A
mps
]
Iin [Primary Amps]
s=0.53
I d=I in
Sensitivedifferentialprotection
en04000260.vsd
Sensitive Oper Level
� 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)
Open CT detection for REB 670
OCT Logic Supervision Level
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� 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)
Check Zone in REB 670
Oper Level
s=0.0-0.90 (settable)
Iout [Primary Amps]
I d [P
rimar
y A
mps
]
Operateregion
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� 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)
Zone Supervision in REB 670
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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
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� 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)
User Features in REB 670 (3-Ph & 1-Ph)
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Bay-Connections & Switchgear Status Matrices
User Settable
Bay Name
Internally Used Bay
FB
Connections to internal
zones
User Settable Switchgear
Names
Switchgear Object Status
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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
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Phase Overcurrent function
� 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
� 4th stage can be used for end fault protection
IF
3I>
4
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End Fault Protection
FeederProtection
BusbarProtection
FeederProtection
BusbarProtection
CT=Measuring Boundary
CB=Clearing Boundary
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 remote end only
When feeder CB is open, extend measuring boundary to the open CB contacts in order to avoid under-trip
Over-TripZone
Under-TripZone
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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
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Summary - REB 670 busbar protection
� 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