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D e p t . o f E l e c t r i c a l & E l e c t r o n i c s E n g i n e e r i n g

A m r i t a S c h o o l o f E n g i n e e r i n g , A m r i t a U n i v e r s i t y , E t t i m a d a i C o i m b a t o r e , T

a m i n a d u

, I n d i a

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DESIGN OF ELECTRICAL SYSTEMS FORLARGE PROJECTS

Course Plan

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COURSE PLAN

Academic Year 2012-13

Department Electrical & Electronics Engineering

Programme B Tech

Semester VI

Course Code EEE352

Course Title Design of Electrical Systems

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COURSE PLAN

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MODULE-I General introduction, Gathering specific data,

Adoption of

design parameters for the particular project,

Selection of basic design philosophies,

detailing the electricalsystem, Preparation of as erected drawings &

design-manuals

Maximum demand estimation-Demand factor for HV motors,

Calculation of MD on the MCCs

MD estimation for an entire Load-Centre Substation & MSS,Statutory inspectors approach towards MD-estimation

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COURSE PLAN

INTRODUCTION SYMBOLS &

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MODULE-II Sizing of transformer capacity on the basis of MD calculation,

Consideration & constraints in the sizing of transformer CBratings, split bus arrangement

Sizing of power, distribution transformer capacity, Techno-economic studies on selection of transformer sizes, Sizing oftransformer to meet HV motor, starts & voltage dips

Short Circuit Calculations, SC analysis, Standards, Passive &dynamic reactances to be considered, reactance multipliers for1st cycle diagram for SC analysis of 415V System

The computation of AC component of fault current,determination of DC component of the fault current & totalfault current IEC Equations, Impact of CB status on fault levels

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COURSE PLAN

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MODULE-III Selection of cable size, continuous rating of cables, thermal

ampacity of cables

Short time short circuit rating of cables, Mechanical withstandof SC forces

Techno-economic consideration in selection of cables, SC

withstand capacity of 1.1 kV cable

Voltage drops in 415V motor, feeders & voltage drop basedampacity,

The use of copper cables for motors of rating less than 7.5

kW

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INTRODUCTION

Introduction

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What are Large Projects ?

Source : DOES for LP by N Balasubramanian

What are Large Projects ??

Connected Load : 10-100 MW

INTRODUCTION

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What is LV/MV/HV/EHV/UHV ?

LV MV HV EHV

INTRODUCTION

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Plant Sub-Station SLD

415V/230VLoads

415V

LV

Bus

HV Motors & DTs

HV Bus

11or

6.6 or

3.3or

1.1kV

HV

11or

6.6 or

3.3or

1.1kV

MSS

EHV/HV

66/11kV

11or

6.6 or

3.3 or

1.1kV

EHV

66kV

EB Grid

EHV/HVPower

Transformer

LCSS-1 HV Bus

PLCEquipments

11kV/415V

Distribution

Transformer

PMCC

PCC

MCC

APFCCapacitors

MCC

MV

Motor-1

MV

Motor-2

LCSS-2 HV Bus

HV

Motor-1

HV

Motor-2

INTRODUCTION

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SLD of 11kV/400V Sub-Station

Source : Principles of Power System [ S Chand ] by V K Mehta

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SLD of 11kV/400V Sub-Station

INTRODUCTION SYSTEM

REPRESENTATION

CONTROL

STRATEGY

SIMULATION

STUDY

EXPERIMENTAL

STUDY CONCLUSION REFERENCES

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SLD of 11kV/400V Sub-Station

INTRODUCTION SYSTEM

REPRESENTATION

CONTROL

STRATEGY

SIMULATION

STUDY

EXPERIMENTAL

STUDY CONCLUSION REFERENCES

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Configuration & Location of EB Sub-Station

Small & Medium Power Demand:

Through OH radial feeder from nearest substation

Large Power Demand: EB establishes a new EHV station near the project

DOES 4 LP / Pg.2

INTRODUCTION

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Location of Plant Sub-Station

Periphery of plant area :

Adv. EHV OH lines doesnt run over theplant area

Within the plant area :[ GIS SS ] EB to plant periphery :

EHV OH line

At periphery :

EHV OH line termination + EB metering

point From peripheryPlant SS :

EHV UG Cable feeders

DOES 4 LP / Pg.2

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Plant Sub-Station SLD

415V/230V Loads

415V

LV

Bus

HVMotors &

DTsHV Bus

HV

6.6 or 11or 3.3 kV

MSS

33/11kV

EHV

33kV

EB Grid

EHV/HVPower

Transform

er

LCSS-1 HV Bus

PLCEquipments

11kV/415V

Distribution

Transformer

PMCC

PCCAPFC

Capacitors

MCC MV Motors

LCSS-2 HV Bus

HVMotor-1

HV

Motor-2

DOES 4 LP / Pg.2

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Plant Sub-Station SLD

EB GridEHV/HV Power

Transformer

LCSS-1 HV Bus

PLCEquipments

11kV/415V

Distribution

Transformer

PMCC

PCCAPFC

Capacitors

MCC MV Motors

LCSS-2 HV Bus

HV

Motor-1

HV

Motor-2

DOES 4 LP / Pg.2

4 HV Cables

Choice of location of Load-Centre-substation so that:

LCSSs are located close to the load groups

To limit the cost of HV cabling & cable galleries

INTRODUCTION

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Plant Sub-Station SLD

Choice of location of Load-Centre-substation so that:

LCSSs are located close to the load groups

To limit the cost of HV cabling & cable galleries

DOES 4 LP / Pg.2

INTRODUCTION

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And hence we can define

PCC : Power Control Centre Main MV Switch board connected to the secondary of the

distribution transformer

From this, MCCs & large 415V motors of P>150kW are fed

MCC : Motor Control Centre From this 415V motor rated up to 150kW are fed

SSB : Sub Switch Board or DB: Distribution Board (or)Sub-Distribution Board Incoming SF or CB &

Outgoing switch fuse feeders connected rather than motor-feeders

PMCC : Combined Power & Motor Control Centre

DOES 4 LP / Pg.2

INTRODUCTION