For second Year class Lecturer's name:Ramazan Tyfor ...cbook.epu.edu.iq/uploads/pdf/EPU1654.pdf ·...

Ministry of Higher Education and Scientific research

Department of: Electrical Power

Erbil technology Institute

University of Polytechnic

Subject: Electric Network

Course Book For second Year class

Lecturer's name:Ramazan Tyfor Mahmood BSc,

Academic Year: 2018/2019

Electric installations

Directorate of Quality Assurance and Accreditation نیایی تی رایه به ڕێوه به ری ڵد خشین به متمانه و ۆج

Ministry of Higher Education and Scientific research Course Book

1. Course name Electric Networks2. Lecturer in charge Ramazan Tyfor Mahmood 3. Department/ College Electrical Power4. Contact e-mail:ramazantyfor @yahoo.com Tel: (optional)5. Time (in hours) per week Theory: 2 , Practical: 2 6. Office hours 6 hours /week7. Course code8. Teacher's academic profile My first job was a Technical Trainer in Electric installations-

Lab at Arbil technology institute after two years as lecturer inElectric installations first year and second year at electric deparment and electric technogy first year at machine deparment for seven years .and from 2003 to 2007 at Kirkuk technical institute as lecturer in Electric installations second year and electric drawings. from 2008-2015 for 8 years also I was the head of and as lecturer in Electric Maintenance work shop. And right now as a lecturer in Erbil technical institute in electrical power with Eletric networks as lecturer.

9. Keywords Generation ,transmission ,distribution, power correction and protection of electrical energy.Electric Cables

10. Course overview: The students will be able to understand the generation ,transmission ,distribution, power correction and protection of electrical energy. ,also they will be able to do mechanical calculation such as span, sag ,tension finally effect of wind and ice calculations electric network subject is talking abut three important issues which are generation of power,then transmission ,distribution of electrical energy , generation is concerned we will talk about the types of energies such as thermal power stations ,hydro power stations nuclear power stations constructions methods of their operation , advantage and disadvantagesof each . they will understand the impotence of voltage regulation ,power factor improvement in addition to equitant circuit of transmission line by both methods of T & Π11. Course objective: The aim of this subject is to get the students be familiar about generation , transmission and distribution of electrical energy , the minimising the electrical losses by choosing a proper conductor , span ,sag for an economical method of distribution ,also they will be able to choose a proper position for power stations also a path of lines so that the cost is convenient , the students can calculate the parameters of transmission lines (resistance , inductance and capacitance) voltage regulation calculations Also thy can draw the vector diagrams of different lines(short, medium and long),then finding the sending end voltages currents ,powers ,power factors also the receiving voltages currents ,powers ,power factor



12. Student's obligation: The student half to attend two hours theory every week in addition of two more exra hours practically in the laboratory after each experiment he should be able to answer the discussion which concludes several questions in a weekly report which carries 10 marks during The year ,after words they mut be ready for a monthly quizzes for both theatrical and practical lecturers. 13. Forms of teaching: ectures are prepared and printed and given to the students before The lecturers ,then during the lecturer it will be shown on power point using the data show In some lecture numerical examples are solved using white board by the students one by One 14. Assessment scheme Assessment scheme for the students during the year will be done as following : The grade of the subject is divided onto several sections as follows

First semester exam theory 20

First semester exam practical 10

First semester Quizzes, attendance, and class activities 5

First semester Practical reports 1 5

Total 50

Final exam theoretical exam 25

Final exam practical exam 25

Total grade or mark 100

15. Student learning outcome: During studying the subject the students will be familiar with the different types an

methods for Power generation including thermal power generation , hydropower generation ,and finally nuclear method of power generation , the he will be able to know the advantage ,disadvantage of each , methods o f power transmission using radial and ring main methods ,the student will be familiar to calculate the different types of losses then efficiency , voltage drops , voltage regulation , power factor

improvement for different type of loads Resistive ,inductive and capacitive loads


Ministry of Higher Education and Scientific research 16.course reading list of references:

At the end of the course the student will have sufficient knowledge about power system Course Reading List and References Main references Useful references Magazines and

review (Internet)1-Electrical Power Transmission & Distribution.

1- The Transmission & Distribution of Electrical Power/H.cotton,H.barbar

1. www.circuits today.com

2.Acourse in Transmission & Distribution./s.k.GIRDAR-S.M. DHIR

مجيد يوسف ابراهيم/الكهربائية القوى -هندسة2بغداد التكنولوجيا معهد-النظري شبكات ملزمة-3

جيلناي . محمود د الكهربائية القوى - هندسة4

2.www.4share .com

3.Acourse in Electrical power/M.L.SONI

4.Acourse in Electrical power/M.L.SONI

3.www.freebookspot.com

Principles of power systemsV.K Mehta

17. The Topics: Lecturers,name

18. Practical Topics (If there is any)Scientific content of the subject: practical experiments are :

1 - Different messuring devices explaning2 - Single phase circuit with different loads ( R,XL,XC)

3 -Three phase transformer loading by A three phase star –connected balanced resistive load.4 -Three phase transformer loading by A three phase star –connected unbalanced resistive load.5 - Three phase transformer loading by A three phase delta –connected balanced resistive load.6 -Three phase transformer loading by A three phase delta –connected unbalanced resistive load.7-Three phase transformer loading by A three phase star –connected balanced inductive load.8- Three phase transformer loading by A three phase star –connected unbalanced inductive load.


Ministry of Higher Education and Scientific research 9-Three phase transformer loading by A three phase delta –connected balanced inductive load.10 - Three phase transformer loading by A three phase delta –connected unbalanced inductive load.11-Three phase transformer loading by A three phase star –connected balanced capacitive load.12- Three phase transformer loading by A three phase star –connected unbalanced capacitive load.

13-Three phase transformer loading by A three phase delta –connected balanced capacitive load.14 - Three phase transformer loading by A three phase delta –connected unbalancedcapacitive load 15-Current transformers (CT).16- load curve &calculation of energy, average power, maximum power, load factor17-Calculation of capacitances of A transmission line model ( open circuit )18- (Short circuits) for transmission line model .19-Power factor improvement.20-Resistive load test for transmission line star connection.21--Inductive loading of A three phase transmission line model star connection.22--Capacitive loading of A three phase transmission line model star connection.23-Resistive load test for transmission line delta connection.24--Inductive loading of A three phase transmission line model delta connection.25--Capacitive loading of A three phase transmission line model delta connection26-Synchronization of a three phase generator and external network.27- Auto recovery of a power system.28- different type of relays29- visiting a thermal power plant30- Visiting a hydro power lines.

19. Examinations:



Q1/ Draw the load curve for following consumers on apower plant during 24 hours and find:

1- total energy 2- avarge energy 3- maximum demand 4- load factor

(20marks)

Q2/ Fill only ( 5 ) five of the following blanks

1 -TheTurbine types are ---------, water turbin ,----------- ,-------------

2 - Medium transmission lines length ---- to ---- km and long transmission lines length above----- km.

3 - The duties of O.H.T.L insulators are ------------------- and ----------------- the conductors

4 – The advantages of Electrical energy ----------,------------,----------------,-----------------

5 - The Types of Aluminium Conductors use in transmissions lines-------,------------,-----------,------

6 - Distribution high voltages --------,--------KV and distribution low voltages . ------- ,--------- V.

(30marks)

Q3 – A // An O.H.T.L, same level as shown below calculate ( Sag , vertical sag , clearance ( C ) )

(15 marks)


Academic year: 2017 – 2018

Ministry of Higher Education& Scientific Research

Erbil Polytechnic University

Erbil Technology Institute

Class: Second

Subject: Elec .Networks

Time:Two hours

Date: / 3 /2018

90MW0 MW50MW40MW30MW20MWLoad

20----2416 ---2012 ---1610 ---- 126 -----100 ----6Time

Ministry of Higher Education and Scientific research Q3 – B // Answer only one branch:-

1- Draw and discuss the effects of transposition for long transmission lines

2 – Find the inductance ( L ) of the two bundle O.H.T.L if ( r = 1.515 cm )

(15marks)

Q4 / In the fig shown three phase double circuits O.H.T.L calculate( Dm , inductance ( L )

if ( Ds = 0.195m ) (20marks)

(( With my best wishes ))

Rmazan.T.Mahmood

Lecturer



Q1// النموذجية الجوبة

Energy = 6x20 + 4x30 +2x40 + 4x50 + 4x0 +4x90 = 880MWh

Average load = 600/24 =36.66 MW

Maximun demand = 90 MW

Load factor = average / maximum = 36.66/ 90 = 0.407

Q2//

1- Steam , water , gas , wind2- 80 to250 , above250km3- Isolation of the conductor , Holding the conductor

4- Economical, Easy to handle, Flexible, Easy to operate5- AAC, AAAC, ACSR , ACAR, AACSR6- 11,33 kv , 220 , 380 v

Q3 – A // An O.H.T.L, same level as shown below calculate ( Sag , vertical sag , clearance ( C ) )

(15 marks

wt =√( wc + wi )2+ww2 = wt =√ (0.7+ 0.1)2+0.62 = 1 Kg/m

S= ( wL2 / 8T) =[( 1 x 300 2 ) / (8 x 2250) ] = 5 m

clearance ( C ) = 25 - 5 = 20 m

cos Ø = 0.8/1= 0.8

Vertical sag = S cos Ø = 5x0.8= 4m



Q3 – B // Answer only one branch:-

1- Draw and discuss the effects of transposition for long transmission lines

2 – Find the inductance ( L ) of the two bundle O.H.T.L if ( r = 1.515 cm )

1//

2 //



Q4//

L = 0.2 ℓn Dm / DS)

L = 0.2 ℓn 4.4 / 0.195) = 0.2 x 3.11 = 0. 623 mH/km



Q2/ A// An O.H.T.L three phase 3 insulators if (V3 = 7.4 kv ,V2 = 6.126 kv ,effeicincy (η ) = 86%)

Calculate ( V1 , ratio of shunt to self capacitance ( m ) , VLine ) (10marks)

B // DC ring distributors shown calculate currents in each sections with diagram.

( I , I AB , I CD , I DE , I EA and VD )

(15marks)

Q3/ A // Answer only one branche :- (10marks) 1- Draw the diagram for Electric power systems from Generation to Consumer (Load).

2- Types of Electrical Power stations.



Ministry of Higher Education &Scientific Research



Class:Second


Time:Two hours

Date: / 6 /2018

Ministry of Higher Education and Scientific research B // Answer only one branche :- (15marks)

1- The loads are supplied from a same source calculate ( Pt , Qt , St , cos Øt )

No. load Power factor Cos Ø Sin Ø Type

1 20 KW 0.8 0.6 lag

2 50 KVA 0.6 0.8 lead3 80KVA 1 0 unity

2- Three phase motor ( 80kw ) connected the condencers banks in dalta with the motor

400V,50HZ Increase power factor from (cos Φ1= 0.8 to cos Φ2 = 0.9 ) . Find ( C ) value

Q4/A // In the fig shown below find ( I1 , ΔV12 , V2 ) (10 marks)

I1

V1=254V Z12 = 6- j3 Z23 = 2.4 + j1.8

I2 = 6A I3 = 3A

cosØ= 0.6 lead cosØ= 0.8 lag

SinØ = 0.8 SinØ = 0.6


1 2 3

Ministry of Higher Education and Scientific research B // Choose the correct answer of the following :- (20 marks) 1- The inductance of a single phase two wire line is given a- 0.1 + 0.4 ln (D/r) mH/km b- 0.05 + 0.4 ln (r/D) mH/km c- 0.05 + 0.2 ln (r/D) mH/km 2- Which of the following is not the transmission voltage in Kurdistan ?a- 64 Kv b- l32kV C - 33kV

3- The voltage across the third unit of a suspension type insulator?

a - V3 = V1 (1 +3 m+ m 2 ) b- V3 = V1 (1 + 3m +2m2) C - V3= V1 (3 + 4m+ m2)

4- A 300 km transmission line carrying power at 400 kV is known asa-short transmission line b-long transmission line C- midium transmission line

5- The Sag of Overhead transmission lines equala- S= w2 L / 8T b- S= wL2 / 8T C- S= wL / 8T2

6- The ratio of voltage regulation%100

a- Vreg = Vr –Vs / Vs b- Vreg = Vs –Vr / Vr C- Vreg = Vs +Vr / Vr

7- It used to step down the current of power system to a lower level to be measured by small rating Ammeter

a- circuit breker b- Voltage Transformer (V.T.) C- Current Transformer (C.T.)

8- The terminals which connect the consumer’s terminals to the distributors called

a- Distributors b- Feeders C- Service mains

9- Which of the following is usually not the generating voltage ?a- 6.6 kV b- 11Kv c- 9.9 kV

10 - usually ( 10) number of insulator discs used for transmission line voltage isa- 11 kV b- 33 kV c- 132 kV

(( With my best wishes ))

Ramazan.T.Mahmood

Lecturer



Q1/ Draw the load curve for following consumers on apower plant during 24 hours and find

1- total energy 2- avarge energy 3- maximum demand 4- load factor (20marks )

Q2/ A// Answer only two branches :- (20marks )

1 – Draw the low voltage (L.V.) distribution system .

2 - Difference between Isolator and Circuit Breaker. 3 - Types of Electrical Power stations.

4- The Types of Aluminium Conductors use in transmissions lines.

B // Find the capacitance rate ( C) for three phase load( 5KW , 400v ) for

power factor correction from cosØ1= 0.75 To cosØ2 = 0.90 (10marks )

Q 3 / A// From the Power triangle complet the following laws .

(10marks )



Ministry of Higher Education &Scientific Research



Class:Second


Time:Two hours

Date: / 9 /2018

50MW20MW60MW40MW20MWLoad

20----2416 ---2012 ---- 168 -----120 ----8Time

Ministry of Higher Education and Scientific research B // Find the inductance ( L ) of the Four bundle O.H.T.L if ( r = 1.14 cm )

(15marks )

Q4 / A // Draw the Bus-Bar types Arrangements (10marks )

B // DC distributor shown . Find the currents in each sections ( I , I CD , I DE , I EB ).

(15marks )

) صباحي الول (الدور النموذجأية الجأوبة

Q1//



Q2 / A

Efficiency = V phase / 3 v3 = V phase / 3 x 7.4 = % 86

V phase = 3 x 7.4 x % 86 = 19.092kv

VL= √ 3 V phase = √ 3 x19.092 = 33 kv

vphase = V1 + v2 + v3

19.092 = V1 + 6.126 + 7.4 ******* V1 = 19.092 - 13.526 = 5.566 KV

V2 = V1(1 + m ) ******** 6.126 = 5.566 ( 1+m)

6.126 = 5.566+5 .566 m m = (6.126 - 5.566 ) / 5.566 = 0.1

Q2/ B



Q3/ A

1- -1- Thermal Power Station

2- 2-Hydro-electric power 3-3-Nuclear

4-4-Gas Power Station5-5-Diesel Power Station

Q3/B

No. load Power factor Cos Ø Sin Ø Type

1 20 KW 0.8 0.6 lag

2 50 KVA 0.6 0.8 lead3 80KVA 1 0 unity

P1 = 20 KW S 1 = P1/0.8=20/0.8=25KVA Q1 = S1 Sin Ø1 = 25 x0.6 =15 KVAR

P2 = S2 cos Ø2=50x0.6=30KW Q2=Ssin Ø2= 50x0.8=40KVAR , S2 = 50KVA

Q3 = 0 S3= P3 =80KW

Pt = P1 + P2 + P3 = 20 + 30 + 80 = 130 KW

Qt = Q 1 + Q2 - Q3 = - 15 + 40 +0 = 25 KVAR

St = [Pt2 + Qt2 ]1/2 = [ 1302 + 252] = 132.4 KVA


http://www.electrical4u.com/thermal-power-generation-plant-or-thermal-power-station/


cos Øt = Pt / St = 130/132.4 = 0.98

Q4/A

I3 = 3( cos Ø – j sin Ø ) = 3( 0.8 – j 0.6 ) = 2.4 – j 1.8 A

I2 = 6( cos Ø + j sin Ø ) = 6( 0.6 + j 0.8 ) = 3.6 + j 4.8 A

I1 = I2 + I3 = 6 + j 3 A

ΔV12 = I1 xZ12 = [6 + j 3 ] [6- j3] = 45 V

V2 = V1 - ΔV23 = 254- 45 = 209 V

Q4/ B

1- a 2- a 3- a 4- b 5- b 6- b 7- c 8- c 9- c 10 – c



) صباحي الثاني (الدور النموذجأية الجأوبة

Q1/ Tptal loads = 8x20 + 4x40 + 4x60 +4x20 + 4x50 = 840 kwh

Avarge = 840 /24 = 35 kw --- max load = 60 kw -- load factor = 35/60= 0.58

Q2/ A- 1-

Low voltage (L.V.) distribution system

2-

Isolator Circuit Breaker

1- off load device 1- on load device2- operated manually 2- operate automatically3- low capacity 3- high capacity

3--1- Thermal Power Station2-Hydro-electric power

3-Nuclear 4-Gas Power Station5-Diesel Power Station


http://www.electrical4u.com/thermal-power-generation-plant-or-thermal-power-station/

Ministry of Higher Education and Scientific research 4 –

Symbols of different types of AL conductorsAAC (All Aluminium Conductor) خطوط ابراج قصیرة

AAAC (All Aluminium Alloy Conductor)ACSR (Aluminium Conductor Steel Reinforced) اكثر استخداما

ACAR (Aluminium Conductor, Aluminium Reinforce)AACSR (Aluminium Alloy Conductor Steel Reinforced)احسن نوعیة

Q2/B

Q3/ A

Q3 / B



Q4/ A

Q // Draw the Bus-Bar types Arrangementsسؤال

B/

20. Extra notes:Here the lecturer shall write any note or comment that is not covered in this template and he/she wishes to enrich the course book with his/her valuable remarks.21. Peer review داچوونه ڵ هاوه ی وه ێپ This course book has to be reviewed and signed by a peer. The peer approves the contents of your course book by writing few sentences in this section.(A peer is person who has enough knowledge about the subject you are teaching, he/she has to be a professor, assistant professor, a lecturer or an expert in the field of your subject).

رسبووکه م ئه ت ده ۆک ت یر سه وه کادیمیه ئه ڵێکی هاوه ن لیه له ێب رسه کانی ته بابه ڕۆکی ناوه و ێبکر و بکات ند سه په که ۆکت ک یه ووشه ند جه رسه ڕۆکی ناوه شیاوی ر سه له ێبنووس بکات ر سه له واژووی و که ۆک .

ت هه زانیاری که یه سه که و ئه ڵ هاوه رسه ر سه له ێب ستا له زانستی ی پله بیت ده و که ۆک ت نه متر که ۆمام ێب .


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