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CASE STUDY OF SUB-STATION DESIGN FOR COPACT AIS.

-By

Pravinchandra Mehta

(Member IEEE & CIGRE)

Trainer, Advisor & Consultant

CEO Persotech Solutions,Vadodara.

.

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AGENDA

Introduction

Sub-Station design for lesser land.

Options available

Case studies-experience

Recommendations/Conclusion

Q & A

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INTRODUCTION Electricity is now essential

commodity in developing and even in under developed countries.

Role of Design of substation is not only to take care the technology being used, standards adopted and safety but also it is supposed to take care the fund ( CAPEX and incurring for maint ) without compromising need of customers.

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SUB-STATION DESIGN

Design of sub-station is an art of science.Selection of

bus switching scheme, technology of equipments etc

plays important role in expenditure incurred during

installation and maintenace, easiness in construction,

and maintenance,expertise required, training required

etc.

All such aspects should be kept into consideration while

design the SS for under developed countries /SS in rural

areas.

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General aspects of SS design where land

requriement is low.

When high reliability is required 2 or more bus

system is used

Where lower reliability can be afforded , on the

contrary cost saving is more imp in that case,

single bus is preferred.

When the station is required to accommodate in

smaller area, two options can be thought

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Solution for less land requirement

Gas Insulated switchgear (GIS)

Mixed technology switchgear (MTS)

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Other solution

Other option possible is compact

AIS substation

One such case study is

presented here to share

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CRITERIEON FOR SELECTING

COMPACT AIS

Requirment of land is less.

Cost is less compared to GIS

Ease of installation and maintenance

Lesser handling of SF6 gas ( possibility of

harming environmental is less)

Lesser training required for personnel.

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CASE STUDY –WEST AFRICAN

UTILITY COMPACT AIS Here the case study is shared for SS of

Liberia ( West Africa) having following

requirements

4 nos of 66kV line bays

2 nos of 66/11kV transformer bays

1 66kV bus with sectionalizer

2 nos of 66kV spare bays

Entire need is fulfilled in a switchyard with area

60x35 m each 66kV bay has width of 8.0 m

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Layout of substation

Layout Plan of substation

Layout Section of substation

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Some photographs

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Conclusion

Selection of technology with respect to the

available financial and human resources should

be made.

Compact AIS is more economical than GIS or

MTS.

Easy for construction

Easy for Maintenance

Lesser training to engineers /operators required

Study of VFTO is eliminated ( which is required

in case of GIS )

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References CIGRE papers on Sub-Station and HV

equipment.

Manual of Substation published by CBIP

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THANKS 4 patience.

I am thankful to CBIP for giving me the chance

to express my views.

Thanks to all my colleagues and friends for

their support.

Thanks to all august gathering here.

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DO VISIT : www.persotechsolutions.com

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