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Introduce to Busbar System :

In electrical power distribution, a bus may be an antimonial strip or bar, generally housed within switchgear, panel boards, and busway enclosures for native high current power distribution. they’re conjointly wont to connect high voltage instrumentality at electrical switchyards, and low voltage instrumentality in battery banks.


The descriptor of a bus is buses. To be fair, many dictionaries do list busses as an alternate descriptor of a bus. however, it seems therefore seldom that the majority folks would read it as a writing system error. The buses begin running early within the morning. the interior bus carries knowledge at intervals the motherboard. External buses carry knowledge to peripherals and different devices connected to the motherboard. The lines or pins of a bus square measure of 3 types: Address – the parts pass memory addresses to at least one another over the address bus.

A station bus theme is an appointment of the overhead bus bar and associated change instrumentation in an exceeding station. The operational flexibility and responsibleness of the station greatly rely upon the bus theme.

The first demand of any station style is to avoid a complete ending of the station for the aim of maintenance, or thanks to a fault somewhere out on the road. a complete ending of the station means that the entire ending of all the lines connected to the station.

The Different Types of Bus Bar :

  • Single bus bar.
  • Single bus bar system with sectionalization.
  • Double bus bar with a single breaker.
  • Double bus bar with double circuit breakers.
  • Breakers and a half with two main buses.
  • Main and transfer bus bar.
  • Double bus bar with bypass isolator.
  • Ring bus.


Single Bus Bar :

As the name suggests, it consists of one bus-bar and everyone the incoming and outgoing lines are connected thereto. The chief benefits of this kind of arrangement ar an occasional initial value, less maintenance, and straightforward operation. However, the principal disadvantage of the one bus-bar system is that if repair is to be done on the bus-bar or a fault happens on the bus, there’s an entire interruption of the availability. This arrangement isn’t used for voltages extraordinary 33kV. The indoor 11kV sub-stations usually use single bus-bar arrangement.



Fig: Single Busbar

Maintenance of any fuse needs conclusion of the corresponding circuit/line and maintenance of the bus needs a whole conclusion of the bus. A bypass switch across the breaker ought to be used for maintenance of the corresponding breaker. Circuit protection is disabled during this case.

Single bus bar system with sectionalization :

In this sort of bus arrangement, the fuse and analytic switches area unit used. The isolator disconnects the faulty section of the bus, therefore protects the system from complete ending. this kind of arrangement uses one addition fuse that doesn’t a lot of increasing the price of the system.


Set single-Single-Busbar

Fig: Sectionalized Single Busbar

The single terminus configuration is that the only and least pricey of all configurations. This configuration wants less installation area and it’s merely swollen. Single bus configurations don’t appear to be thought of reliable systems which they need to entirely be enforced in substations where high responsibility isn’t required, like large transmission yards. responsibility and accessibility of this technology area unit improved by increasing and sectionalizing the bus.


Double Bus Bar With a Single Breaker :

An extra-time connects every main bus and is commonly closed, granting extra flexibility operative. A fault on one bus wants isolation of the bus whereas the circuits square measure fed from the choice bus.



Fig: Double Busbar

The double bus single breaker theme is dearer and desires extra installation house than the one bus configuration. it’s common to look out this theme with an extra transfer bus in EHV transmission substations.


Double Bus Bar With Double Breaker :

For transfer operation, one ought to initial shut the bus mechanical device electrical fuse then shut the isolator related to the bus to wherever the feeder would be transferred then open the isolator related to the bus from wherever the feeder is transferred. Lastly, once this transfer operation, he or she ought to open the bus mechanical device breaker.



Fig: Double Busbar Double Breaker

This configuration utilizes two buses and a pair of breakers per circuit. every buses unit ordinarily energized ANd ANy circuit is removed for maintenance whereas not an outage on the corresponding circuit. Failure of one of the two buses won’t interrupt a circuit as a result of all of the circuits is fed from the remaining bus and analytic the unsuccessful bus. Substations with the double bus double breaker arrangement want doubly the instrumentation owing to the only bus theme, however, unit very reliable. Load deed between buses is achieved by shifting circuits from one bus to the alternative. This theme is commonly found in EHV transmission substations or generating stations.


Breakers and a Half With Two Main Buses :

The breaker-and-a-half configuration, generally used at extra-high-voltage stations, consists of 2 buses, every commonly energized. Electrically connected between the buses area unit 3 circuit breakers and, between every 2 breakers, a circuit.


Fig: Half With Two Main Buses

In this arrangement, 3 circuit breakers area unit utilized in a bay for 2 freelance circuits; therefore, every circuit shares the common center electrical fuse, thus their area unit one.5 circuit breakers per circuit. The breaker-and-a-half configuration provides for electrical fuse maintenance, since any breaker may be far from service and isolated while not interrupting any circuit. to boot, faults on either of the most buses cause no circuit interruptions. Failure of an electrical fuse leads to the loss of 2 circuits if a standard breaker fails and just one circuit if an outdoor breaker fails. it’s vital to balance circuits within the bays, for instance, supply lines coming back into the right-hand facet of bays and cargo lines feat the left-hand facet of bays.


Main and Transfer Bus Bar :

The conductor arrangement uses bus mechanical device that connects the uninflected switches logic gate breaker to the conductor. The bus mechanical device is additionally used for transferring the load from one bus to a different just in case of overloading.


Fig: Main Busbar

The transfer bus is energized and additionally, the isolator nearest the transfer bus of the breaker to be maintained is closed.

The electrical device to be maintained is presently opened, isolated and removed for maintenance.

The circuit to lower place maintenance is transferred to the transfer bus.

In the main and transfer bus configuration, the protective relay theme is the type of advanced as a result of the requirement of the extra time to handle each situation for the maintenance of the opposite electrical device.

This bus theme is further costly than the one bus configuration, however, is further reliable and may be merely expanded.

The modification procedure is subtle for the upkeep of Associate in Nursing electrical device. Failure of a breaker or fault on the bus finishes up in Associate in Nursing outage of the whole station.

once no Tie CB is a gift, for maintenance of an electrical fuse, the transfer bus is energized by closing the isolator switches to the transfer bus.

Then the electrical fuse to be maintained is opened and isolated on each side. Circuit protection is disabled during this maintenance arrangement.

Double Bus Bar With Bypass Isolator :

This is a mixture of the double bus system and main bus and transfer bus system. In Double Bus System with Bypass Isolators either bus will act as main bus and second bus as transfer bus.


Fig: Double Baipass Isolator

It permits breaker maintenance while not interruption of power that isn’t attainable in a very double bus system, however, it provides all the benefits of the double bus system. It, however, needs one further isolator for every feeder circuit and introduces slight complication in system layout. Still, this theme is best for an associate optimum economy of the system, and it’s the most effective wonderful alternative for the 220-kilovolt system.


Ring Bus :

In the ring bus configuration, as a result of the name implies, the circuit breakers area unit connected to create a hoop, with isolators on all sides of each breaker. Circuits terminate between the breakers and each circuit is fed from all sides.


Fig: Ring Busbar

Any of the circuit breakers are going to be opened and isolated for maintenance whereas not interruption of service.

This theme has smart operational flexibility and high reliableness. If a fault happens throughout this configuration, it’s isolated by tripping a breaker on all sides of the circuit.

By tripping two breakers, alone the faulted circuit is isolated whereas all the alternative circuits keep in condition.

The main disadvantage of the ring bus system is that if a fault was to occur, the ring is split that may end in two isolated sections. every one of these two sections won’t have the proper combination of providing and product circuits.

This can be somewhat avoided by connecting the provision and product circuits facet by facet.