1. Strategic planning for Nablus power system
Prepared by:
Aya Kamal Alawneh
Amal Nazzeh Allan
Presented to:
Dr. MAHER KHAMMASH

2. Our project is to make a load flow study and analysis for MojeerAldeen& Aljam3a and Kamal jomblat (Nablus) Electrical Network using ETAP software
to improve the power factor
to reduce the electrical losses in the network
to increase the capability of the transformers and the transmission lines

3. Outlines Electrical Network Improvements
Protection Analysis
Future planning for connection point
Optimization electrical network
Electrical Network Improvements

4. Nablus electrical network

5. 1.1 Simulation For Mojeer Al deen Network fed
Electrical Network Improvements
1.1 Simulation For Mojeer Al deen Network fed
from Quseen
1.1.1 FOR MAXIMUM CASE
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
7.597
2.616
8.03
94.55Lag
Apparent Losses:
0.098
0.631
∆P%
1.29
Max. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
7.8
2.8
8.2
88.8 lag
Apparent Losses:
0.122
0.71
∆P%
1.56

6. Electrical Network Improvements
V% Mojeer Al deen Network
from Quseen(max)
1.05 Vnominal <V<1.1 Vnominal

7. Electrical Network Improvements
PF for Mojeer al deen from Quseen
Max case

8. Electrical Network Improvements
1.1.2 FOR MINIMUM CASE
we reduce the loads to 40% from the original case
Min. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.8
1.015
3.131
94.59 lag
Apparent Losses:
0.015
0.054
∆P%
.541
Min. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.902
1.476
3.255
89.14 lag
Apparent Losses:
0.017
0.058
∆P%
0.586

9. Electrical Network Improvements
1.1.3 The economical study
∆∆P=∆Pbefore,cap - ∆Pafter,cap ∆∆P:saving in real power losses ∆Pbefore,cap : real power losses before adding capacitor ∆Pafter,cap : real power losses after adding capacitor
Z∆p=∆∆p*T*100 Z∆p : annual saving in real power cost
T max =the time of max loss = 3800 h
100:cost per MWh($/MWh)
Kc=C*Qc Kc :cost of capacitor C: cost of capacitor per KVAr($/KVAr) Qc: capacitor KVAr

10. Electrical Network Improvements
Fixed Cap=4000($/MVAr).
Regulated Cap= ($/MVAr) Zc =0.22*Kc Zc :annual capacitor running cost 0 .22: maintenance & life time of capacitor (depreciation factor) ∆Z=Z∆p-Zc ∆Z: annual saving S.P.B.P=investment(capacitors initial cost)/ total annual saving S.P.B.P < 2year →→→project is visible S.P.B.P > 2year →→→project is not visible

11. Electrical Network Improvements
Economical for Mojeer al deen from Quseen
Max case
∆∆P=saving in real power losses
==∆Pbefore-∆Pafter= Z∆p= annual saving in real power cost
==∆∆p*T*100==
T=the time of max loss
$/MWH=100
Kc=cost of capacitor= cost of capacitor per KVAr * capacitor KVAr Kc=0 .55* *10000 =8100$ Zc= annual capacitor running cost ==0.22*Kc=1782 $/ year
∆Z= annual saving =Z∆p-Zc= ==7338
Which is > good design
S.P.B.P =Kc/∆Z =8100/7338=1.1 year which is feasible

12. 1.2 Simulation For Mojeer Al deen Network
Electrical Network Improvements
1.2 Simulation For Mojeer Al deen Network
Fed from Sara
1.2.1 FOR MAXIMUM CASE
Max. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
8.3
2.49
8.211
95.94
Lag
Apparent Losses:
0.18
0.4
∆P%
2.1
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
8.200
2.398
8.544
95.98Lag
Apparent Losses:
0.110
0.398
∆P%
1.34

13. Electrical Network Improvements
V% Mojeer Al deen Network
from Sara(max)

14. Electrical Network Improvements
PF for Mojeer al deen from Sara
Max case

15. Electrical Network Improvements
1.2.2 FOR MINIMUM CASE
Min. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
3.163
0.839
3.272
96.67Lag
Apparent Losses:
0.016
0.059
∆P%
.506
M. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
3.227
0.857
3.338
96.66 lag
Apparent Losses:
0.018
.061
∆P%
0.558

16. Electrical Network Improvements
1.3 Simulation For Aljam3a and Kamal jomblat Network fed from Quseen
1.3.1 FOR MAXIMUM CASE
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
5.38
2.38
6.397
92.82Lag
Apparen t Losses:
0.290
0.478
∆P%
5.4
Max. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
5.747
3.082
6.521
88.12
Lag
Apparent Losses:
0.333
0.528
∆P%
5.8

17. Electrical Network Improvements
V% Aljam3a and Kamal jomblat Network
in Quseen (max) V%
1.05 Vnominal <V<1.1 Vnominal

18. Electrical Network Improvements
P.F Aljam3a and Kamal jomblat Network
From quseen

19. Electrical Network Improvements
Economical for Aljam3a and Kamal jomblat from Quseen
Max case
∆∆P=saving in real power losses
==∆Pbefore-∆Pafter= Z∆p= annual saving in real power cost
T=the time of max loss
$/MWH=100
==∆∆p*T*100=
Kc=cost of capacitor= cost of capacitor per KVAr * capacitor KVAr Kc= * *10000= =6040$ Zc= annual capacitor running cost ==0.22*Kc= 1329 $/ year
∆Z= annual saving = ==15011
Which is > good design
S.P.B.P =Kc/∆Z = = 4.8 months which is feasible

20. Electrical Network Improvements
1.3.2 FOR MINIMUM CASE
Min. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.593
0.955
2.763
93.83
Lag
Apparent Losses:
0.057
0.091
∆P%
.2.1%
Min. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.902
1.476
3.255
89.14 lag
Apparent Losses:
0.089
.098
∆P% 3%

21. Chapter(1) :Electrical Network Improvements
1.4 Simulation For Aljam3a and Kamal jomblat Network FED from Sara case
1.4.1 FOR MAXIMUM CASE
Max. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
6.245
1.776
6.493
96.19
Lag
Apparen t Losses:
0.330
0.524
∆P%
5.2
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
6.063
1.042
6.447
98.69
Lag
Apparent Losses:
0.296
0.488
∆P%
4.6

22. Electrical Network Improvements
V% Aljam3a and Kamal jomblat Network
in Sara (max) V%

23. Electrical Network Improvements
P.F Aljam3a and Kamal jomblat Network
From Sara

24. Electrical Network Improvements
1.4.2 FOR MINIMUM CASE
Min. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.504
0.595
2.574
97.29
Lag
Apparen t Losses:
0.047
0.075
∆P%
1.87
MIN. load case results without improvement MW
Mvar
MVA
% PF
Swing Bus(es):
2.9
0.87 3
96.19
Lag
Apparent Losses:
0.055
0.087
∆P%
1.89

25. For mojeer al deen Max. load case results with improvement MW Mvar MVA
Quseen
network
Sara
network
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
7.597
2.616
8.03
94.55Lag
Apparent Losses:
0.110
0.398
∆P%
1.34
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
8.200
2.398
8.544
95.98Lag
Apparent Losses:
0.098
0.231
∆P%
1.29

26. For Aljam3a and Kamal jomblat
Quseen
network
Sara
network
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
5.38
2.38
6.397
92.82Lag
Apparen t Losses:
0.296
0.488
∆P%
5.4
Max. load case results with improvement MW
Mvar
MVA
% PF
Swing Bus(es):
6.063
1.042
6.447
98.69
Lag
Apparent Losses:
0.290
0.478
∆P%
4.6

27. Comparison between the Quseen and Sara networks
Quseen network
Sara network
Its fed from Sara connection
Its has a high p.f due to transfer loads from Quseen to Sara connection point
So the p.f increase and lower losses than the Quseen network
-Its fed from Quseen connection point
-It has low P.F
& higher Losses

28. Optimization of the electrical network
2.1 Replacing transformers
The table below shows the values
of apparent power
and the load factor before and after the replacing:
Summary
 Apparent Losses for mojeer al deen

29. Optimization electrical network
2.2 : Operation mode of medium voltage distribution feeders:
Medium voltages (MV) are radialy..
We construct ring network to insure back-up connections to improve the reliability of the system. .
In MOJEER ALDEEN network we should construct rings for all four main feeders (on 6.6kv) after the switch gear ,between every two adjacent feeders
The main transmission line is ACSR
( cross sectional area120) Carries an electric current up to 395A.

30. Optimization electrical network
But at worst condition they carry currents as the following

31. Optimization electrical network
Ring between ALM3AJEN and ALDARDOK feeder:
Ring between ALENJELE and ALITHAD feeder:

32. Ring between ALMAHKAMA and ALENJELE feeder
Summary
Ring between ALMAHKAMA and ALENJELE feeder

33. Optimization electrical network
2.3 Design substation
Suggestion for Location of substation

34. Optimization electrical network
The main purpose of substation mainly feds hospitals and north region (Aseera Al Shmalia) and it is near the loads and it decreases losses so the current reach the customer in good quality also to improve ring system

35. Optimization electrical network
This figure shows the configuration of substation

36. Future planning for connection point
Electrical Network Supply
Nablus are fed from 4 connection point by Israel Electrical Company (IEC), At 33KV as following:
Sara
Carracon
Transformer
(33-11KV) 10MVA
Al jam3a
 Mojeer Al deen
(33-11KV)
5MVA
Nablus
1.Asker (odeleh & Almeslekh)
30MVA
2.Sara 40MVA
3 .Innab 7MVA
4 .Howwara 20 MVA

37. Element of sara connection point
Transmission Line
There are two type of conductor:
1.ACSR 150mm2
2.XLPE cables 240mm2
The resistance and reactance of XLPE and ACSR in table below
(A) Transmission Line Data
MV Cable XLPE
Resistance (Ω/Km)
0.0975
Reactance (Ω/Km)
Length (Km)
3.7
Resistance (Ω)
Reactance (Ω)
MV overhead line ACSR
0.223
0.257
4.7
1.0481
1.2079

38. Future planning for connection point
4.1 Strategic planning for the network .
Power (W)consumption in last ten year

39. Future planning for connection point
Load Flow Results
we can summarize the forecasted results, total generation, demand , loading., percentage of losses, and the total power factor for the maximum case in future ten years in Nablus network as in tables below:

40. Future planning for connection point

41. Future planning for connection point
4.2 Recommended and solution
So Nablus connection point (sara) will include four 161/33KV transformers (each of 45MVA
Nablus network will fed from 161/33KV Sara connection point which consist of 4*45MVA capacity and 9 outgoing feeders
After three years around (2015) all connection points will be cancellation
So we suggest another connection point gives 20 MVA to fed the network .
Adding to previous four connection points
The connection point in 2013 will be full .

42. Future planning for connection point

43. Protection Analysis Why protection system is needed
Personnel saifty against electrical hazards .
Avoid equipment stress(thermal,electrical,mechanical damages) .
make network stability .
Clear electrical faults and maintain service continuity
Short cct calculation :
In our project we use Etap program to calculate the maximum currents for three regions East , MEDIUM and WEST loads .and we get the required short cct current from NEDCO

44. Protection Analysis Selection of circuit breaker :
I C.B ≥ K safty*Imax load K safty=1.3
V C.B ≥ Vsystem
I breaking capacity ≥ 1.2 Is.c
Selection of instrument transformer :
Potential transformer : Vs= 110v but V p≥ V source
Current transformer : Is=5 A but I p≥ 1.1Imaxload

45. Protection Analysis and Design
To make differential protection for the power transformer as the following figure:

46. Protection Analysis and Design
The relay which we used is (inverse time relay )
 The aim of the protection in our project is how to achive selectivity between cct breakers
The following eqn is to calculate the setting (T)time of each relay
T=t0/K
T: setting time
t0 :operating time
K: factor depend on the type of the relay curves

47. Protection Analysis and Design
t0 :operating time

48. Thank We thanks Dr.maher khammash
We thanks NEDECO for cooperation with us especially for :
Eng. Shadia Qamheye
Eng.Allam Abd Alfattah
Eng.Samah Alnamer