Design of Electrical Systems for Large Projects

INTRODUCTION

SYMBOLS & ABBREVIATIONS

IE RULES & REGULATIONS

DESIGN PROCEDURE

SUBSTATION EQUIPMENTS

Dept. of Elec trical & Electronics Engineering

CASE STUDIES

PROJECT COMMISSIONING

DESIGN OF ELECTRICAL SYSTEMS FOR LARGE PROJECTS INTRODUCTION



DESIGN PROCEDURE

Course Plan


CASE STUDIES


COURSE PLAN INTRODUCTION



DESIGN PROCEDURE


CASE STUDIES


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Academic Year

2012-13

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Department

Electrical & Electronics Engineering

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Programme

B Tech

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Semester

VI

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Course Code

EEE352

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Course Title

Design of Electrical Systems


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DESIGN PROCEDURE


CASE STUDIES


MODULE-I 

General introduction, Gathering specific data,Adoption of design parameters for the particular project,

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Selection of basic design philosophies, detailing the electrical system, Preparation of as erected drawings & design-manuals

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Maximum demand estimation-Demand factor for HV motors, Calculation of MD on the MCCs

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


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DESIGN PROCEDURE


CASE STUDIES


MODULE-II 

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Sizing of transformer capacity on the basis of MD calculation, Consideration & constraints in the sizing of transformer CB ratings, split bus arrangement Sizing of power, distribution transformer capacity, Technoeconomic studies on selection of transformer sizes, Sizing of transformer to meet HV motor, starts & voltage dips Short Circuit Calculations, SC analysis, Standards, Passive & dynamic reactances to be considered, reactance multipliers for 1st cycle diagram for SC analysis of 415V System The computation of AC component of fault current, determination of DC component of the fault current & total fault current IEC Equations, Impact of CB status on fault levels


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DESIGN PROCEDURE


CASE STUDIES


MODULE-III 

Selection of cable size, continuous rating of cables, thermal ampacity of cables

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

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Techno-economic consideration in selection of cables, SC withstand capacity of 1.1 kV cable

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Voltage drops in 415V motor, feeders & voltage drop based ampacity,

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

INTRODUCTION INTRODUCTION



DESIGN PROCEDURE

Introduction


CASE STUDIES


What are Large Projects ? INTRODUCTION



DESIGN PROCEDURE

What are ‘Large Projects’ ?? 

N O I T C U D O R T N I

Connected Load : 10-100 MW


CASE STUDIES


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



LV


DESIGN PROCEDURE

MV


HV

CASE STUDIES

EHV


Plant Sub-Station SLD INTRODUCTION




DESIGN PROCEDURE

MSS

HV

HV Bus

EHV

EHV/HV

11or

11or

66kV

66/11kV

6.6 or

6.6 or

11or

3.3or

3.3or

6.6 or

1.1kV

1.1kV


415V HV Motors & DT’s

1.1kV

LCSS-1

HV Bus


415V/230V Loads

PMCC

MCC

PCC

APFC Capacitors

11kV/415V Distribution

EB Grid

LV Bus

PLC Equipments

3.3 or

CASE STUDIES

Transformer

EHV/HV Power Transform er

MV HV Motor-1 LCSS-2

MCC

Motor-1 MV

HV Bus HV Motor-2

Motor-2

SLD of 11kV/400V Sub-Station INTRODUCTION



DESIGN PROCEDURE


CASE STUDIES



SYMBOLS SYSTEM & REPRESENTATION ABBREVIATIONS

IE CONTROL RULES & REGULATIONS STRATEGY

SIMULATION DESIGN PROCEDURE STUDY

EXPERIMENTAL SUBSTATION EQUIPMENTS STUDY

CASE CONCLUSION STUDIES

PROJECT REFERENCES COMMISSIONING


SYMBOLS SYSTEM & REPRESENTATION ABBREVIATIONS

IE CONTROL RULES & REGULATIONS STRATEGY

SIMULATION DESIGN PROCEDURE STUDY

EXPERIMENTAL SUBSTATION EQUIPMENTS STUDY

CASE CONCLUSION STUDIES

PROJECT REFERENCES COMMISSIONING

Configuration & Location of EB Sub-Station SYMBOLS & ABBREVIATIONS

INTRODUCTION

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

DESIGN PROCEDURE


Small & Medium Power Demand: 



Through OH radial feeder from nearest substation

Large Power Demand: 

EB establishes a new EHV station near the project

CASE STUDIES


Location of Plant Sub-Station INTRODUCTION

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DESIGN PROCEDURE


Periphery of plant area : 

N O I T C U D O R T N I


Adv. EHV OH lines doesn’t run over the plant area

Within the plant area :[ GIS SS ] 

EB to plant periphery : 

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At periphery : 

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EHV OH line EHV OH line termination + EB metering point

From periphery – Plant SS : 

EHV UG Cable feeders

CASE STUDIES




EHV

MSS

33kV

33/11kV


DESIGN PROCEDURE

HV 6.6 or 11 or 3.3 kV

HV Bus


HV Motors & DT’s PLC Equipments

CASE STUDIES

415V LV Bus


415V/230 V Loads

PMCC 11kV/415V LCSS-1

HV Bus

Distribution

PCC

APFC Capacitors

MCC

MV Motors

Transformer EB Grid

EHV/HV Power Transform er

HV Motor-1 LCSS-2

HV Bus HV Motor-2


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DESIGN PROCEDURE


CASE STUDIES


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 PLC

LCSS-1

HV Bus

Equipments

PMCC

11kV/415V

PCC

APFC Capacitors

MCC

MV Motors

Distribution

Transformer EB Grid

EHV/HV Power Transformer HV Motor-1 LCSS-2

HV Bus HV Motor-2

4 × HV Cables


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DESIGN PROCEDURE


CASE STUDIES


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

And hence we can define… INTRODUCTION


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CASE STUDIES


Main MV Switch board connected to the secondary of the distribution transformer From this, MCC’s & large 415V motors of P>150kW are fed From this 415V motor rated up to 150kW are fed

SSB : Sub Switch Board or DB: Distribution Board (or) Sub-Distribution Board  

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MCC : Motor Control Centre 

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DESIGN PROCEDURE

PCC : Power Control Centre 



Incoming SF or CB & Outgoing switch fuse feeders connected rather than motorfeeders

PMCC : Combined Power & Motor Control Centre

Design of Electrical Systems for Large Projects

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