Types of Busbar Scheme & Substation

Types of Busbar scheme

 Single busbar

 Double busbar with one breaker per circuit.

 Double busbar with two breakers per circuit.

 Main and transfer bus

 Ring bus

 Breaker and a half arrangement

 Mesh arrangement etc.

Structural arrangement

1.    Design of towers and beams

2.    Fabrication drawings of tower & beams

3.    Tower foundation and their designs

4.    Design of equipment supporting structure

a)    CT

b)    CVT

c)    LA

d)    Bus Post Insulator

e)    Isolator

f)     Wave Trap

g)    Circuit Breaker

5.    Equipment supporting structure fabrication drawings

a)    CT

b)    CVT

c)    LA

d)    Bus Post Insulator

e)    Isolator

f)     Wave Trap

g)    Circuit Breaker

6.    Details of foundation bolts

a)    Equipment Structure

b)    Gantry Structure

7.    Design of equipment foundations & foundation details

8.    Cable trench layout

9.    Cable trench section details

10. Cable trench road crossings

11. Marshalling box foundation

12.   Sump pit

Types of substation: 

The substations can be classified in several ways including the following:

i)             Classification based on voltage levels e.g.:

ii)            AC Substation: EHV, HV, MV, LV; HVDC substation

iii)           Classification-outdoor or indoor.

iv)           Outdoor substation is under open sky. Indoor substation is

v)            inside a building.

vi)           Classification based on configuration, e.g.:

a.    Conventional air insulated outdoor substation or

b.    SF6 Gas Insulated Substation (GIS)

c.    Composite substations having combination of the above two.

vii)         Classification based on application.

a.    Distribution substation

b.    Switchyard in Generating Station

c.    Switching substation (without power transformers)

d.    Sending-end substation

e.    Receiving substation

f.     Factory substation

g.    Compensating substation e.g. having static var compensation etc.

Features of a AC Substation & HVDC subsation

An AC Substation has following parts:

 AC Switchyard

 Control Building

 DC Battery System and LT Distribution System

 Mechanical, Electrical and other auxiliaries

 Civil works.

An HVDC substation has following main parts:

 AC Switchyard

 Converter Transformers

 AC Filter banks

 Valve Halls

 AC Switchyard, Smoothing Reactor, DC Filters

 Mechanical, Electrical and other auxiliary systems