jj102 electrical technology chapter 3 three phase systems [compatibility mode]

Prepared By:Sheilani Binti ShaariDepartment of Electrical Engineering/PKB

Course Learning Outcome (CLO)

Upon completion of this course, students should be able to:

Department of Electrical Engineering PKB

Apply the principles of three phase systems, balanced load, star and delta type of connection to solve electrical circuit correctly.

CONTENT

1.INTRODUCTION2.3 PHASE SYSTEM3.DIFFERENCE 3 PHASE & 1 PHASE


3.DIFFERENCE 3 PHASE & 1 PHASE4.3 PHASE LOAD CONNECTION

5.3 PHASE POWER

LEARNING OUTCOMES

General Objective (GO)Student should be able to understand the basic principles of a three phase system.


principles of a three phase system.

Specific Objectives(SO)Student should be able to:1.Define three phase system with diagram. 2.Differentiate between three phase system and single phase system

3.State three phase supply consists of three phase conductors.

Generation System Transmission System Distribution System

INTRODUCTION


11kv 132kv 415v

240v

Three phase Single phase

INTRODUCTION

3Phase System Is 3 separate coil

conductors which


conductors which 120o apart

Produce 3 voltage source with same magnitude but different phase 120o.

Three-phase system have 3 phase conductor or live wire :

INTRODUCTION


1. Red Phase, R2. Yellow Phase, Y3. Blue Phase, B

R

Y

B

0

120

240

3 SYSTEM


R

YB emf is generated using 3 conductor

conductors have the

R

Y B

conductors have the same coils and rotating at a constant speed

3 SYSTEM


the emf generated has the same three-emf amplitude or peak value with phase shift

R YB

peak value with phase shift of 120 and same frequency.

Dge

EER EY EB

0sinmE omE 120sin

3 SYSTEM


EmER EY EB

0 120 240

Waveform of 3 System

o

mE 240sin

sinmR EE =)120sin( omY EE =

)240sin( omB EE = emf

3 SYSTEM


)240sin(mB EE = Em

ER EY EB

0 120 240

Equations of 3 System

emf

EER EY EB om

omR

EE

EE

120

02

=

=

3 SYSTEM


EmER EY EB

0 120 240

omB

omY

EE

EE

2402

1202

=

=

Equations of 3 System represent in a form of phase

3 SYSTEM 1 SYSTEMDefinition: Definition:

DIFFERENT 3 & 1 SYSTEM


Definition:System with 3 live cabels from supply to load : Red phase(R), Yellow phase (Y) and Blue phase (B).

Definition:System with 2 cable connecting from source to load: Life cable (L) and neutral cable (N).

3 SYSTEM 1 SYSTEMConnection: Connection:



Connection: Connection:

240v

L

N

Load

R

Y

B

N

415v

240v

3 SYSTEM 1 SYSTEMWaveform: Waveform:



Waveform: Waveform:V

240

0

90

180

415

V

R Y B

0120 240

1. Transmission system

2. Supply power to

APPLICATIONS OF 3 SYSTEM


2. Supply power to large factories

3. Starting the 3 machines.

More economical due to less construction and maintenance costs

ADVANTAGES OF 3 SYSTEM


conductor used is smaller, thus the needs of copper can be reduced.

Easy to installed due to smaller and lighter cable used.



Therefore the smaller structures supporters can be used and the distance between the supporters can be relatively long.

The characteristics of 3 equipment have a better operating starting due to its stable and fixed power.



to its stable and fixed power.

Electrical energy supplied is higher than 1.

Most large motors used for induction motor 3 can stand alone without the additional equipment such as



the additional equipment such as capacitors, centrifugal switches or other additional circuits

The output Production and equipment quality of work for 3 system is better than 1 because of



system is better than 1 because of the higher efficiency and power factor .

CONTENT

1.INTRODUCTION

2.3 PHASE SYSTEM

3.DIFFERENCE 3 PHASE & 1 PHASE


3.DIFFERENCE 3 PHASE & 1 PHASE

4.3 PHASE LOAD CONNECTION5.3 PHASE POWER

LEARNING OUTCOMES

General Objective (GO)Student should be able to understand the basic principles of a three phase system.


principles of a three phase system.

Specific Objectives(SO)Student should be able to:

1. State that three phase loads can be connected in delta or star.

2.State balanced star and delta connection.

3.Determine the power in three phase system.

CONTENTS

3PHASE LOAD CONNECTION STAR CONNECTION 3PHASE VOLTAGE AND CURRENT


3PHASE VOLTAGE AND CURRENT

DELTA CONNECTION 3PHASE VOLTAGE AND CURRENT

3PHASE POWER APPARENT POWER, REAL POWER AND REACTIVE POWER

3 LOAD CONNECTION

Load on each phase is usually balanced.

The connections have 4 conductor

3 live wire and 1 neutral wire:


3 live wire and 1 neutral wire:

Red Line, R

Yellow Line,Y

Blue Line, B

Neutral line, N

3 LOAD CONNECTION

There are 2 methods of load connection in 3 system


DELTA ( ) STAR ( Y )

RLoad

STAR CONNECTION


N

Y

B

Load

LoadLoad

Line Voltage (VL)

voltage that measure between 2 life

STAR CONNECTION


voltage that measure between 2 life wire.

- ERY , EYB dan EBR

Phase Voltage (VP)

STAR CONNECTION


Voltage that measure between life and neutral wire

- ERN , EYN dan EBN

VL = ERB VL = EYRVP = ERN

R

Load

STAR CONNECTION


VL = EYR

VL = EBY

VP = EBN VP = EYN

N

Y

B

Load

LoadLoad

Voltage Formula

STAR CONNECTION


Line Voltage = 3 Phase VoltageVL = 3 VP

Line Current (IL)

Current that flow in line

STAR CONNECTION


Current that flow in line

- IR , IY and IB

Phase Current (IP)

STAR CONNECTION


Current that flow in phase

- IPR , IPY and IPB

RLoad

IL = IR IP = IPR

STAR CONNECTION


N

Y

B

Load

Load

Load

IL = IY

IL = IB

IP = IPB

IP = IPY

Current Formula

STAR CONNECTION


Line Current = Phase CurrentIL = IP

Example

3 ballance load STAR connection have 10

STAR CONNECTION


3 ballance load STAR connection have 10resistance and 0.019H inductance. The supplyvoltage is 415V, 50Hz. Calculate:i. Line voltage,ii. Phase voltage,iii. Line current andiv. Phase current

RDELTA CONNECTION


B

Y

Load

Load

Load

VL

DELTA CONNECTION


VL

VL

VPVL

Y

Load

Load

Load

Voltage Formula

DELTA CONNECTION


Line Voltage = Phase VoltageVL = VP

IL = IRIP = IPR

DELTA CONNECTION


Y

Load

Load

Load

IL = IYIP = IPY

IL = IB

IP = IPB

Current Formula

DELTA CONNECTION


Line Current = 3 Phase CurrentIL = 3 IP

Example

3 ballance load DELTA connection have 10

DELTA CONNECTION


3 ballance load DELTA connection have 10resistance and 0.019H inductance. The supplyvoltage is 415V, 50Hz. Calculate:i. Line voltage,ii. Phase voltage,iii. Line current andiv. Phase current

3 POWER

Power in 3 phase is the same as insingle phase


3 types three phase power:1. Apparent Power,

2. Active / Real Power and

3. Reactive / Reactance Power

APPARENT POWER

Single Phase :

PPP IVS = VA


3 Phase :

VA

PxSS 33 =PPIV3

LLIV3=

=

REAL POWER

Single Phase :WcosPPP IVP =


3 Phase :

W=

PxPP 33 =cos3 PPIVcos3 LLIV=

REACTIVE POWER

Single Phase :VARsinPPP IVQ =


3 Phase :

VAR=

PxQQ 33 =

sin3 LL IVsin3 PPIV=

SQ

sinPPP IVQ = PPP IVS =

POWER TRIANGLE


S

P

Q

=3Q sin3 LLIV

=3P cos3 LLIVcosPPP IVP =

=3S LLIV3

Example

Calculate:

3 POWER


Calculate:

i. Apparent power,

ii. Real power,

iii. Reactive power

for both connections in previous example.


SOLVE PROBLEMS(Q1 Q13)

NEXT:CHAPTER 4


BASIC PRINCIPLE OF ELECTROMAGNETIC

jj102 electrical technology chapter 3 three phase systems [compatibility mode]

Documents

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single phase system

phase supply

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blue phase b

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