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Career Point Cares
TOPIC-: Various Bus Bar Arrangement
Submitted by -:
Sharukh khan
Branch -: electrical
UID -: k11652
Semester-: 5th /3rd year
Submitted to-:
Mr. kamal Arora
HOD of Electrical
department
Career Point Cares
CONTENTS
CONDUCTOR USED FOR BUSES
SINGLE BUS WITH BUS SECTIONALISER
SINGLE BUS SYSTEM
DOUBLE BUS SYSTEM
DOUBLE BREAKER BUS SYSTEM
ONE AND A HALF BREAKER BUS SYSTEM
MAIN AND TRANSFER BUS SYSTEM
DOUBLE BUS SYSTEM WITH BYPASS ISOLATOR
RING BUS SYSTEM
Career Point Cares
CONDUCTOR USED FOR BUSES
All Aluminum conductor (AAC)
All Aluminum alloy conductor (AAAC)
Aluminum conductor with aluminum alloy
reinforced (ACAR)
Aluminum conductor with steel reinforced
(ACSR)
Career Point Cares
SINGLE BUS SYSTEM
Advantages-:
1.Simple in Design
2.Less Expenditure
Disadvantages-:
1.In case of bus fault or bus bar isolator fault or maintenance
total Substation is out of service.
2.In case of maintenance of transformer circuit breaker the
associated transformer has also to be shut-down. Similarly for
Line also.
In this arrangement, the single bus-bar is divided into
sections and load is equally distributed on all the
sections. Any two sections of the bus bar are connected
by a circuit breaker and isolators.
Career Point Cares
SINGLE BUS WITH BUS SECTIONALISER
Advantages:
1. One complete section can be taken out for Maintenance
without disturbing the continuity of other section.
2. If a fault occurs on one section of the Bus, that faulty
section alone will be isolated.
Disadvantages:
It will be a little more costly with the addition
of one isolator and some cases with Circuit
breaker, C.Ts and C&R panel.
Some advantages are realized if a single bus bar is sectionalized with circuit breaker.
If there are more than one incoming and the incoming sources and outgoing feeders
are evenly distributed on the sections as shown in the figure, interruption of system
can be reduced to a good extent.
Career Point Cares
DOUBLE BUS SYSTEM
Advantages:
Double Bus Bar Arrangement increases the flexibility of
system.
Disadvantages:
:The arrangement does not permit breaker maintenance
with out interruption
In double bus bar system two identical bus bars are used
in such a way that any outgoing or incoming feeder can
be taken from any of the bus.
Career Point Cares
DOUBLE BREAKER BUS SYSTEM
Advantages:
There is no need of bus coupler as because the operation
is done by breakers instead of isolator
Disadvantages:
Most expensive as it involves additional breaker, CT
Isolators etc for each circuit.
Career Point Cares
ONE AND A HALF BREAKER BUS SYSTEM
Advantages:
During any fault on any one of the buses, that faulty bus will be
cleared instantly without interrupting any feeders in the system
since all feeders will continue to feed from other healthy bus.
Disadvantages:
This scheme is much expensive due to investment for
third breaker.
This is an improvement on the double breaker scheme to effect
saving in the number of circuit breakers. For every two circuits
only one spare breaker is provided. The protection is however
complicated since it must associate the central breaker with the
feeder whose own breaker is taken out for maintenance.
Career Point Cares
MAIN AND TRANSFER BUS SYSTEM
Switching operation-:
1. First close the isolators at both side of the bus coupler breaker.
2. Then close the bypass isolator of the feeder which is to be transferred to
transfer bus.
3. Now energized the transfer bus by closing the bus coupler circuit breaker from
remote
4. After bus coupler breaker is closed, now the power from main bus flows to the feeder line
through its main breaker as well as bus coupler breaker viatransfer bus.
5. Now if main breaker of the feeder is switched off, total power flow will instantaneously shift
to the bus coupler breaker and hence this breaker will serve the purpose of protection for the
feeder.
6. At last the operating personnel open the isolators at both sides of the main circuit breaker to
make it isolated from rest of the live system.
Career Point Cares
DOUBLE BUS SYSTEM WITH BYPASS ISOLATOR
Advantages:
It permits breaker maintenance without interruption of
power which is not possible in double bus system but it
provides all the advantages of double bus system.
Disadvantages:
It however requires one additional isolator (bypass
isolator) for each feeder circuit and introduces slight
complication in system layout.
This is combination of the double bus system and main and
transfer bus system. In Double Bus System with Bypass
Isolators either bus can act as main bus and second bus as
transfer bus.
Career Point Cares
RING BUS SYSTEM
Advantages:
It provides a double feed to each feeder circuit, opening one breaker
under maintenance or otherwise does not affect supply to any feeder.
But this system has two major disadvantages.
1. Flexibility for breaker maintenance
2. Each breaker removable without disconnecting
load
3. Only one breaker needed per branch,
4. Each branch connected to network by two
breakers
5. All change-over switching done with circuit-
breakers & hence flexible.
Career Point Cares

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Template ppt power engg.

  • 1. Career Point Cares TOPIC-: Various Bus Bar Arrangement Submitted by -: Sharukh khan Branch -: electrical UID -: k11652 Semester-: 5th /3rd year Submitted to-: Mr. kamal Arora HOD of Electrical department
  • 2. Career Point Cares CONTENTS CONDUCTOR USED FOR BUSES SINGLE BUS WITH BUS SECTIONALISER SINGLE BUS SYSTEM DOUBLE BUS SYSTEM DOUBLE BREAKER BUS SYSTEM ONE AND A HALF BREAKER BUS SYSTEM MAIN AND TRANSFER BUS SYSTEM DOUBLE BUS SYSTEM WITH BYPASS ISOLATOR RING BUS SYSTEM
  • 3. Career Point Cares CONDUCTOR USED FOR BUSES All Aluminum conductor (AAC) All Aluminum alloy conductor (AAAC) Aluminum conductor with aluminum alloy reinforced (ACAR) Aluminum conductor with steel reinforced (ACSR)
  • 4. Career Point Cares SINGLE BUS SYSTEM Advantages-: 1.Simple in Design 2.Less Expenditure Disadvantages-: 1.In case of bus fault or bus bar isolator fault or maintenance total Substation is out of service. 2.In case of maintenance of transformer circuit breaker the associated transformer has also to be shut-down. Similarly for Line also. In this arrangement, the single bus-bar is divided into sections and load is equally distributed on all the sections. Any two sections of the bus bar are connected by a circuit breaker and isolators.
  • 5. Career Point Cares SINGLE BUS WITH BUS SECTIONALISER Advantages: 1. One complete section can be taken out for Maintenance without disturbing the continuity of other section. 2. If a fault occurs on one section of the Bus, that faulty section alone will be isolated. Disadvantages: It will be a little more costly with the addition of one isolator and some cases with Circuit breaker, C.Ts and C&R panel. Some advantages are realized if a single bus bar is sectionalized with circuit breaker. If there are more than one incoming and the incoming sources and outgoing feeders are evenly distributed on the sections as shown in the figure, interruption of system can be reduced to a good extent.
  • 6. Career Point Cares DOUBLE BUS SYSTEM Advantages: Double Bus Bar Arrangement increases the flexibility of system. Disadvantages: :The arrangement does not permit breaker maintenance with out interruption In double bus bar system two identical bus bars are used in such a way that any outgoing or incoming feeder can be taken from any of the bus.
  • 7. Career Point Cares DOUBLE BREAKER BUS SYSTEM Advantages: There is no need of bus coupler as because the operation is done by breakers instead of isolator Disadvantages: Most expensive as it involves additional breaker, CT Isolators etc for each circuit.
  • 8. Career Point Cares ONE AND A HALF BREAKER BUS SYSTEM Advantages: During any fault on any one of the buses, that faulty bus will be cleared instantly without interrupting any feeders in the system since all feeders will continue to feed from other healthy bus. Disadvantages: This scheme is much expensive due to investment for third breaker. This is an improvement on the double breaker scheme to effect saving in the number of circuit breakers. For every two circuits only one spare breaker is provided. The protection is however complicated since it must associate the central breaker with the feeder whose own breaker is taken out for maintenance.
  • 9. Career Point Cares MAIN AND TRANSFER BUS SYSTEM Switching operation-: 1. First close the isolators at both side of the bus coupler breaker. 2. Then close the bypass isolator of the feeder which is to be transferred to transfer bus. 3. Now energized the transfer bus by closing the bus coupler circuit breaker from remote 4. After bus coupler breaker is closed, now the power from main bus flows to the feeder line through its main breaker as well as bus coupler breaker viatransfer bus. 5. Now if main breaker of the feeder is switched off, total power flow will instantaneously shift to the bus coupler breaker and hence this breaker will serve the purpose of protection for the feeder. 6. At last the operating personnel open the isolators at both sides of the main circuit breaker to make it isolated from rest of the live system.
  • 10. Career Point Cares DOUBLE BUS SYSTEM WITH BYPASS ISOLATOR Advantages: It permits breaker maintenance without interruption of power which is not possible in double bus system but it provides all the advantages of double bus system. Disadvantages: It however requires one additional isolator (bypass isolator) for each feeder circuit and introduces slight complication in system layout. This is combination of the double bus system and main and transfer bus system. In Double Bus System with Bypass Isolators either bus can act as main bus and second bus as transfer bus.
  • 11. Career Point Cares RING BUS SYSTEM Advantages: It provides a double feed to each feeder circuit, opening one breaker under maintenance or otherwise does not affect supply to any feeder. But this system has two major disadvantages. 1. Flexibility for breaker maintenance 2. Each breaker removable without disconnecting load 3. Only one breaker needed per branch, 4. Each branch connected to network by two breakers 5. All change-over switching done with circuit- breakers & hence flexible.