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Electrical Bus System and Electrical Substation Layout

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Electrical Power System Engineering

Thursday, 30th August, 2012

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Electrical Bus System & Substation Layout
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Electrical Bus System

There are many different electrical bus system schemes available but selection of a particular scheme depends upon the system voltage, position of substation in electrical power system, flexibility needed in system and cost to be expensed.

The maincriteria’s to be considered during selectio of one particular Bus – Bar Arrangement Scheme among others

(i) Simplicity of system (ii) Easy maintenance of different equipments. (iii) Minimizing the outage during maintenance. (iv) Future provision of extension with growth of demand (v) Optimizing the selection of bus bar arrangement scheme so that it gives maximum return from the system.http://www.electrical4u.com/electrical-transmission/electrical-bus-system.php

19/03/2008

Electrical Bus System and Electrical Substation Layout

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Some very commonly used bus bar arrangement are discussed below

Single Bus System

Single Bus System is simplest and cheapest one. In this scheme all the feeders and transformer bay are connected to only one single bus as shown.Advantages of single bus system
This is very simple in design This is very cost effective scheme This is very convenient to operate

Disadvantages of single bus system

One but major difficulty of these type of arrangement is that, maintenance of equipment of any bay cannot be possible without interrupting the feeder or transformer connected to that bay.

The indoor 11KV switchboards havequite often single bus bar arrangement.

Single Bus System with Bus Sectionalizer

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.

Advantages of single bussystem with bus sectionalizer

If any of the sources is out of system, still all loads can be fed by switching on the sectional circuit breaker or bus coupler breaker. If one section of the bus bar system is under maintenance, part load of the substation can be fed by energizing the other section of bus bar.

http://www.electrical4u.com/electrical-transmission/electrical-bus-system.php19/03/2008

Electrical Bus System and Electrical Substation Layout

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Disadvantages of single bus system with bus sectionalizer

As in the case of single bus maintenance of equipment of any bay cannot be possible without interrupting the feeder or transformer connected to that bay. The use of isolator for bus sectionalizing does not fulfill the purpose. The isolators have operated‘off circuit’ and which is not possible without total interruption of bus – investment for bus-coupler breaker is

Double Bus System

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. Actually every feeder is connected to both of the buses in parallel through individual isolator as shown in the...