Gunnar Stranne Busbar protection REB 670 protection REB 670 Gunnar Stranne 2 © A B B P o w e r T e c h n o l o g i e s A B 2006-04-20 Gunnar Stranne A 3 © A B B P o w e r T e c h

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ower

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2006-04-20 Gunnar Stranne A

©

Rio de JaneiroApril 23-25, 2006

Busbar protection REB 670

Gunnar Stranne

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REB 500 is enabled for use with IEC61850 communication

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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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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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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


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

700

ABB

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



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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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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

ABB

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


� 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


Operateregion

Diff Oper Level

I d [P

rimar

y A

mps

]

Iin [Primary Amps]

s=0.53

I d=I in

Sensitivedifferentialprotection

en04000260.vsd


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Operateregion

Diff Oper Level

I d [P

rimar

y A

mps

]

Iin [Primary Amps]

s=0.53

I d=I in

Sensitivedifferentialprotection

en04000260.vsd


� 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


� 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

Documents

Gunnar Stranne Busbar protection REB 670 protection REB 670 Gunnar Stranne 2 © A B B P o w e r T e c h n o l o g i e s A B 2006-04-20 Gunnar Stranne A 3 © A B B P o w e r T e c h