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Camarines Norte State College
College of engineering and Industrial Technology
Daet, Camarines Norte
Electrical Engineering Department
A design entitled
DESIGN OF DISTRIBUTION SYSTEM OF BIL SUBDIVISION
Is presented to the faculty of College of Engineering and Industrial Technology
In partial fulfillment to the requirements in our subject
Electrical Power Transmission and Distribution
( EE 22 )
By:
Bendrian Z. Babagay
Arjay N. Icatlo
Michael D. Limboy
Engr. Aileen S. SalvadorInstructor
March 2010
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PREFACE
This work is one of a requirement in the course Bachelor of Science in Electrical
Engineering
The designers become more exposed when it comes to designing a transmission
system, and hoping that this knowledge to improve more once they have a particular job.
The research paper includes the design of transmission and distribution lines for
different loads such as residential, commercial, institutional, and industrial loads.
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ACKNOWLEDGMENT
The designers would like to extend their greatest gratitude to the persons who help
bringing this design possible.
Their parents, who brought them into this earth and gave them life, for their
undying love and support
Their classmates, for their support, criticisms, and encouragement
Their instructress, for the ideas, guidance and motivation
Above all, the Almighty God, from who came all the wisdom and knowledge this
world possessed.
The designers
Bendrian Z. BabagayArjay N. Icatlo
Michael D. Limboy
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INTRODUCTION
Electrical phenomena are omnipresent in nature, so mankind started from simple
observations and slowly built his understanding of electricity. Since we all know that the
creation of the world exists in two occurrences, the day and night. Let us stress the time of
darkness, imagine the world without light at night. Ancient people lie on the discovery of
fire so that anyone creates an insight which will contribute to the discovery of electricity.
After electricity was on the zenith of study in everywhere in the world, the invention
of the different machine took place around 19th century. Large industry, motor vehicles
and other automatic and manually operated machine were now on top as proof of modern
civilization and technology. All of this invention was developed and improved through the
aid of electricity and if the latter is concern, we must know how to use and conserve it
wisely for the purpose of minimizing the cost of operation, maintenance and damage to
nature. The invention of transformer is the main reason of this study for isolating and
giving emphasis to the word substation. The word substation comes from the daysbefore the distribution system become a grid. Substation is used to step down the
incoming voltage supply so that the requirements of the domestic and industrial are met.
A reliable and stable supply of electric power is considered a necessity for
development. Nowadays, center of economic and commercial establishments in a certain
place consider electric power as the heart of their business. The design objective for the
substation is to provide as high level of reliability and flexibility as possible while satisfying
system requirements and minimizing total investment cost. With these ideas, the
researchers pave to install an Industrial Substation at Central Plaza area which is the
center of commercial industry in the province of Camarines Norte. It aims to distinguish
the convenience and effectivity as well as the continuity of power service between power
systems existing at Central Plaza and compared it to the above mentioned.
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DEFINITION OF TERMS:
AMPERE. The practical unit for measuring flow of current, when a one ohm resistance
is connected to one volt source, one ampere will flow.
AMPACITY. The current in amperes, which a conductor can carry continuously under
the conditions of use without exceeding its temperature rating
ASSEMBLY. A combination of all or of apportion of component parts included in an
electric apparatus, mounted on a supporting frame or panel, and properly
intertwined.
AUTOMATIC. Self-acting operating by its own mechanism when actuated by some
impersonal influence
BUILDING. A structure that stands alone or that is cut-off from adjoining structures by
firewalls with all openings therein protected by approved fire doors.
BUILDINGS, INSTITUTIONAL. Include school buildings, hospitals, museums,
display centers, government buildings and the like.
BUS. A conductor, a group of conductors, in the switchgear assemblies which serves
as a common connection for two or more circuits
CIRCUIT
CIRCUIT, BRANCH. The circuit conductors between the final overcurrent
device protecting the circuit and the outlet(s)
CIRCUIT BREAKER. A device designed to open and close a circuit by
non-automatic means and to open the circuit automatically on a
predetermined overcurrent without damage to itself when properly applied
within its rating.
COVERED. A conductor encased within material of composition or thickness that is not
recognized by the code as electrical insulation.
CUT-OUT. An assembly of a fuse supports with either, a fuse holder, fuse carrier, or
disconnecting blade.
DEMAND FACTOR. The ratio of the maximum demand of a system, or part of system,
to the total connected load of a system, to the total connected load of a system or
the part of the system under consideration.
DISCONNECTING MEANS. A device that, or group of devices, or other means by
which the conductors of a circuit can be disconnected from their source of supply.
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DROP. The voltage drop that occurs across a resistor due to current flow through the
resistor
DWELLING, MULTIFAMILY. A fixed, stationary, or portable self-contained, electrically
utilization equipment which words or symbols design to convey information or
attract attention
DWELLING, MULTIFAMILY. A building that contain three or more dwelling unit
ELECTRICAL SIGN. A fixed, stationary, or portable self-contained, electrically
utilization equipment which words or symbols design to convey information or
attract attention
ESTABLISHMENTS.
ESTABLISHMENTS, COMMERCIAL. Include department stores, stadiums
condominiums, convention centers, restaurants, etc. used for business or
profit.
ESTABLISHMENTS, INDUSTRIAL. A building or part of a building (other than
office or exhibit space) where persons are employed in manufacturing
processes or in the handling of materials, as distinguished from dwelling,
offices and like occupancies.
FEEDER. A circuit conductor between the service equipment, or the generator
switchboard of an isolated plant, and the final branch-circuit overcurrent device
FUSE. An overcurrent protective device with a circuit-opening fusible member which is
heated and severed by the passage of overcurrent through it
GROUND. A conducting connection, whether intentional or accidental, between
electrical circuit equipment and the earth
ILLUMINATION. Density of the luminous flux on a surface; it is the quotient of the flux
by the open area of the surface when the latter is uniformly illuminated.
INSTALATIONS. An assembly of electric equipment in a given location on designed
for coordinated operation, and properly erected and wired.
JOINT. A connection between two or more conductors
LIGHT. For the purpose of illumination, light is visually evaluated as radiant energy.
LOAD CENTER. A point at which the load of a given area is assumed to be
concentrated
LOAD, PEAK. The maximum load consumed or produced by a unit or group of units in
a stated period of time. It may be maximum instantaneous load or the maximum
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average load over a designated interval of time.
MAXIMUM DEMAND. The largest of all the demands which have occurred during the
specific period of time
OVERCURRENT. Any current in excess of the rated of equipment or the ampacity of a
conductor
PANELBOARD. A single panel or group of panel units designed for assembly in the
form of a single panel, including buses, automatic overcurrent devices to be place
in cabinet or cut-out box placed in or against a wall or partition and accessible only
from the front.
SPLICE. A joint between two wires which possesses mechanical strength as well as
good electrical conductivity
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SELECTION OF TRANSFORMERS:
Sample solution for transformer selection
Given:
Load density for different end users
Highly Urbanized cities and industrial
Estates
20-24 VA per square meters
Not highly urbanized cities 15-20 VA per square meters
Towns and Subdivisions 10-15 VA per square meters
Rural areas 3-10 VA per square meters
We are designing a subdivision we consider 10 15 VA per square meters.
The loads for residential is classified into 3 class the Class A, Class B, and Class C.
We assigned the lowest value of the bracket to the Class C which has less electricity
consumption, the highest value to class A with the highest electricity consumption, and for
the class B we assigned the average value.
Below are the VA per square meter of the different classification of residential loads:
Class A 15 VA/sq. mtrs.
Class B 12.5 VA/sq. mtrs.
Class C 10 VA/sq. mtrs.
Equipment 0001
No of customer served =13
Type of load = Class A (15VA)
Total Area =300 sq. mtrs.
For KVA demand
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For KW demand
For the size of transformer refer to Table 1
Since the demanded is 58,500 VA, it is between 50 and 75 KVA transformer then we
should select the highest one.
Table 1 Standard FLC of single-phase transformer.
KVA 120 V 240V 480V 600 V
1 833 4.17 2.08.. 1.67
1 1/2 125 6.25 313 2.5
2 16.7 8.33 4.17 3.33
3 25. 12.5 6.25 5
5 41.7 20.8 10.4 8.337 1/2 62.5 31.3. 15.6 12.5
10 83.3 41.7 20.8 16.7
15 125 62.5 31.3 25
20 167 83.3 41.7 333
25 208. 104 52.1 41.730 250 125 62.5 50
37 313 156 78 625
50. 417 208 104 833
75 625 313 156 125
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Other Computation
Equipment no 01
Number of costumer served Area
Class A 13 300
Industrial
KW Demand 46800 W
KVA Demand58500
VA
Recommended Transformer 75KVA
Equipment no 02
Number of costumer served Area
Class A 9 300
Class B 12 154
KW Demand 50880 W
KVA Demand63600
VARecommended Transformer 75KVA
Equipment no 03
Number of costumer served Area
Class B 24 154
Institutional 1 1549
KW Demand 56787 W
KVA Demand70984
VA
Recommended Transformer 75KVA
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Equipment no 04
Number of costumer served Area
Class C 43 72
KW Demand 24768 W
KVA Demand30960
VA
Recommended Transformer 37.5KVA
Equipment no 05
Number of costumer served Area
Class C 21 72
KW Demand 12096 W
KVA Demand15120
VA
Recommended Transformer 20KVA
Equipment no 06
Number of costumer served Area
Commercial 1 775
Commercial 3 590
KW Demand 30540 W
KVA Demand38175
VA
Recommended Transformer 50KVA
Equipment no 07
Number of costumer served Area
Class B 12 154
Class C 25 72
KW Demand 32880 W
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KVA Demand41100
VA
Recommended Transformer 50KVA
Equipment no 08,09,10
Number of costumer served Area
Industrial 1 6286
KW Demand 62860 W
KVA Demand78575
VA
Recommended Transformer 30KVA each
Equipment no 11
Number of costumer served Area
Institutional 1 1936
KW Demand 24781 W
KVA Demand
30976
VA
Recommended Transformer 37.5KVA
Equipment no 12
Number of costumer served Area
Institutional 1 500
street lighting 108
KW Demand 13152 W
KVA Demand16440
VA
Recommended Transformer 20 KVA
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Sample voltage drop computation
From the table on the cable hand book from Phelps dodge the constant reactance of
Aluminum conductor steel reinforced is 0.097 per km and the resistance is 0.000876
per km.
From the equation With a distance of 47.88 m from pole 002 to pole 003
For the current:
VA demand = 58500 VA
Sending Voltage = 230 volts
Substituting the values to the equation we have
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VOLTAGE DROP CO
Primary
Voltage DropNo of Wires Distance
KW
demandVoltage Current
L
Reac
Phase A 1 260.3 180000 7620 23.62 0.0
Phase B 1 370.1 175000 7620 22.97 0.0
Phase C 1 377.60 175000 7620 22.97 0.0
Secondary
Voltage Drop
No of
Wires Distance
KW
demand Voltage Curr
Equipment no 0001 From pole 002 to 004 1 89.0958500
VA230 254
Equipment no 0002 From pole 003A to003E
1 112.1963600
VA230 276
Equipment no 0003 From pole 004A to004C
1 72.2170984
VA230 308
Equipment no 0004 From pole 005 to006C
1 212.4830960
VA230 134
Equipment no 0005 From pole 007 to007C
1 101.2215120
VA230 65.
Equipment no 0006 From pole 008 to 009 1 28.0930540
VA230 132
Equipment no 0007 From pole 011 to011B
1 92.2832880
VA230 142
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Table 2.0 Resistance Rating per Miles
ACSR
ALUMINUM COPPER
EQUIVAL
ENT
AWG
MCM
RESISTANCE
AWG
MCM
AREA
Square
Inches
Ohms Per
Mile (61 %at
25 C)
6 0.021 8 3.56
5 0.026 72.82
2.24
4 0.033 6 2.24
4 0.033 6
3 0.041 5 1.78
2 0052 4141
1.41
2 0.052 4 1.12
1 0.066 3
1/0 0.083 2 0.885
2/0 0105 10.702
0.556
3/0 0.132 1/0 0.441
4/0 0.166 2/0
1197 1,680
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Table 2.1 Electrical Characteristics of Single Phase 60-Hz Distribution Transformers.
Size, Single Phase KVAImpedance Percent Z
Percent Voltage Drop through Transformerwith Full-load Current
Cu Loss % Core Loss %
97.5 % pf 80 % pf 50 % pfSingle-Phase Transformer, Voltage, Rating: 2400/4160 to 120/230
3 2.7 32.90 2.56 2.7 2.4 2.27 0.935 2.7 38.40 2.46 2.7 2.51 2.12 0.72
7.5 2.7 43.5 2.35 2.66 2.58 1.96 0.6410 2.7 45.9 2.29 2.66 2.62 1.88 0.57
15 2.8 51.6 2.21 2.71 2.76 1.74 0.5125 2.8 56 2.08 2.64 2.79 1.56 0.46
37.5 2.9 61.8 1.95 2.62 2.9 1.37 0.394
50 2.9 64.7 1.84 2.56 2.89 1.24 0.37275 3.5 69.4 1.99 2.94 3.45 1.24 0.37
100 3.5 69.9 1.96 2.93 3.45 1.2 0.37
Table 2.2Aluminum Conductor Steel Reinforced (ACSR)
NominalSectionalArea-mm
Number and SectionalArea-mm
TensionLoad kg
Weightkg/km
AmpacityConductor DCResistance at
12/km Aluminum Steel
19 6/2.0 1/2.0 698 76.12 180 1.5232 6/2.5 1/2.5 1400 128.6 230 0.899
58 6/3.5 1/3.5 1980 233.1 340 0.49790 6/4.2 1/42 2770 335.5 530 0.345
95 6/4.5 1/4.5 3180 385.2 530 0.301120 30/3.2 7/2.3 5550 573.7 600 0.233160 30/3.6 7/2.6 6990 732.6 730 0.182
200 30/2.9 7/2.9 8620 911.7 780 0.147240 30/3.2 7/3.2 10210 1110 900 0.12
330 26/4.0 7/3.1 10930 1320 1000 0.0888410 26/4.5 7/3.5 13890 1673 1100 0.0702
520 54/3.5 7/3.5 15600 1969 1380 0.0559610 54/3.8 7/3.8 18150 2320 1500 0.0474
STANDAR FUSE LINK AMPERE RATING
1,2,3,6,8,10,12,15,20,25,30,40,50,60,70,80,90,100,110,125,150,175,200,225,250,300,350,400,450,500,6
00,700,800,900,1000,1200,1600,2000,4000,5000,6000
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DESIGN FOR STREET LIGHTING
For the minor roads we were using a single sided lighting arrangement
For a minor road having one side arrangement, and road with of 8 meters, we
should use a 70 watts lamps and a luminaire spacing bracket of 10 40 but considered to
have a spacing of 15 meters. The mounting height will be 8 meters and the mast arm
length to be 1.5 meter.
Illustration:
For the rural highways we were using a single sided lighting arrangement
For rural highways having one side arrangement, the road with of 8 meters, we
should use a 150 watts lamps and a luminaire, we considered 20 meters as the spacing.
The mounting height will be 8 meters and the mast arm length will be 1.5 meters.
Illustration:
20.000 Meters
8.0
00Meters
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Table 3 Specification Guide for Roadway Lighting
Road
Classification
Road
Width,meters
Arrangement
Lamp
Wattage,watts
Luminaire
Spacing,meters
Mounting
Height,meters
Mast
Arm
Length,
meters
Express
10Twin central
250 25-35 12 1.5
15 250 20-35 12 3.0
30
Opposite
250 20-45 12 1.5
25 250 20-40 12 1.5
30 250 20-30 12 1.5
36 250 20-25 12 1.5
40 250 20-22 12 1.5
Major
10One-side
250 10-40 10 1.5
15 250 10-45 12 3.0
10Twin Central
150 20-37 10 1.5
15 250 20-43 12 3.0
20
Opposite
150 20-40 10 3.0
25 250 20-45 10 1.530 250 20-45 10 1.5
36 250 20-45 12 3.0
40 250 20-45 12 3.0
Collector
10One-side
150 10-40 10 1.5
15 250 10-50 12 3.0
10Twin Central
150 20-40 10 1.5
15 150 20-37 12 3.0
20Opposite
150 20-47 10 1.5
25 250 20-48 10 1.5
Rural Highway
8
One-side
150 10-38 8 1.5
10 150 10-37 8 3.0
15 150 15-38 10 3.0
10Twin Central
150 20-45 10 3.0
15 150 20-39 12 3.0
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20 Opposite 150 20-45 8 1.5
Minor
4
One-side
70 10-40 8 1.5
6 70 10-40 8 1.5
8 70 10-40 8 1.5
10 70 10-39 8 1.5
10 Twin Central 70 20-35 8 1.5
15 Staggered 70 10-20 8 1.5
15 Opposite 70 20-40 8 1.5
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SPECIFICATION FOR CONSTRUCTION:
1. General
All construction work shall be done in a thorough and workmanlike manner
in accordance with the Staking Sheets, Plans and Specifications, and the
Construction Drawing.
2. Distribution of Poles
In distributing of poles, large choice, closed grain poles shall be used for
transformers, dead-end, angle and corner poles.
3. Distribution Transformer
The transformer should be designed and manufactured with the latest
applicable provision of ANSI, NEMA, or any recognized equivalent standards.
The transformer shall be rated 13.2 kV primary 240 V secondary, 60 Hertz.
4. Lightning Arrester
Proper selection of an arrester type and rating shall involve the
consideration of the following criteria.
a) Rated voltage
b) Maximum continuous over voltage capacity
c) Protection absorption capability
d) Energy absorption capacity
e) Pressure relief capability
5. Cut-Out
Cut-out support should have the following
a) Joint less current path
b) Silver to silver contact
c) Copper alloy casting should be used on fusetube and bottom support
d) Interchangeable fusetube
e) Solid porcelain insulator with cemented steel rods on top, bottom and back
6. Taps and Jumper
Jumper in other loads connected to line conductor shall have sufficient
slack to allow free movement of the conductor. Where slack is not shown on
construction drawing it will be provide by at least two bonds in vertical plane, of one
in a horizontal plane, or the equivalent. In areas where Aeolian vibration occurs,
special measure to minimize the effect of jumper break shall be used as specified.
7. Splices and Dead ends
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Conductor shall be spliced dead end as shown on the construction drawing.
There shall be not more than one splice per conductor in any span and splicing
sleeves shall be located near conductor support. Maintain also 3050mm or more
separation between the splice and the conductor support. No splice shall be
located in grade 13 crossing span and preferable not in adjacent spans.
8. Guys and Anchors
Guys shall be placed before the conductor are strung and shall be
attached to the pole as shown in the construction drawing. All anchors and rods
shall be in line with the strain and shall be so installed that approximately 15cm of
the rod remain out of the ground. In cultivated fields or other location, as deemed
necessary, the projection of the anchor rod above earth may be increased to
maximum of 30cm to thoroughly tamp to the full depth. When a cone anchor is
used, the hole after the anchor has been set in place, shall be backfilled with
course crushed rocks for 60cm above the anchor, tamping during the filling with
the remainder of the hole to be backfilled and tampered with dirt.
9. Locknuts
A locknut shall be installed with each nut or other fastener on all bolts or
threaded hardware such as insulator pins, upset bolts, double arming bolts, etc.
10. Conductors
Conductor shall be handled with care; conductor shall not be stamped
on nor run over by vehicles. Each reel shall be examined and the wire shall be
inspected for cuts, kinks, or other injuries. Injured portion shall be cut and
conductor spliced. The conductors properly mounted on pulled over suitable
rollers or stringing blocks shall be carefully mounted on pole or cross arm if
necessary to prevent binding while stringing. The neutral conductor shall bemaintained on one side of the pole (preferable the road side) for tangent
construction and for angles not exceeding 30 degrees.
11. Hot Line Clamp and Connectors
Connectors and hot line clamps suitable for the purpose shall be installed
as shown on guide drawings. On all hot line clamp installations, the clamp
and jumper shall be so installed so that they are permanently bonded to the
load side of the line, allowing the jumper to be energized when the clamp is
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disconnected. This applies in all cases, even where the line layout is such that
the trip line is in actuality the main back to the power source. Do not install hot
line clamps directly to the power ACSR conductors. Use tapping armor rods on
top saddles. Before installing hot line clamp to the surface of tapping armor rods,
clean thorough by wire brushing and apply a suitable inhibitor to the area of the
tapping armor rod coming in all contact with the hot line clamp.
12. Lightning Arrester Gap Settings
The external gas electrodes of lightning arrester, combination arrester
cutout units, and the transformer moun ted arrester shall be adjus ted to
the manufacturer's recommended spacing. Care shall be taken that the
adjusted gap is not disturbed when the equipment is installed.
13. Conductor Ties
Ties shall be in accordance with Construction Drawings. Hot line ties shall
not be used at grade B crossings.
14. Sagging of Conductors
Conductor shall be sagged with the conductor manufacturer's
recommendations except that a maximum increase of 7.6cm of the
specif ied sag i n any span wi ll be acceptable but in no circumstances shall a
decrease in the specified sag be allowed.
15. Secondary and Service drops
Secondary conductors may be bare or covered wire or
multi-conductor service cable. Conductor for secondary under build on
primary lines is normally bare except in those instances where prevailing
conditions may limit primary span length to the extent that covered wire
or service cable type. Secondary and service drops shall be so installed as
not to obstruct climbing space. There shall not be more than one splice per
conductor in any span, and splicing sleeves shall not be located near the
conductor support. Maintain 3m or more separation between the splice
and the conductor support. Where the same covered conductors or
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service cables are to be used for the same secondary and service drop
they may be installed in one continuous run.
16. Ground
Ground rod shall be driven in undistributed earth in accordance with
the construction drawing. Where aluminum ground wire is used, it must be
terminated above ground at a galvanized ground rod or splice by a
compression connector to copper steel ground wire extension to the
ground rod of which the top of the ground rod shall be 30cm or more
below the surface of the earth. The ground wire shall be space two feet (2
ft) apart except for a distance of 2.40m above the ground rod and 2.40m
down from the top of the pole where they shall have at least two
connections from the frame case or tank to the multi-grounded neutral
conductor. The equipment shall be interconnected and attached to a
common ground wire.
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TECHNICAL SPECIFICATION
The National Grid Corporation of the Philippines (NGCP), Labo Branch
loc at ed at Talobatib, Labo, Camarines Norte will be the commercial source of the
distribution system of BIL Subdivision. This power source 69kV, three phase
line came from the said substation.
From the source there will be a process of stepping down the voltage from 69
kV to 13.2 kV down to 7620V to 240V. Through the distribution transformers
situated along the different strategic location within the subdivision premises.
Each distribution transformer wi ll have a specific number of consumers to be served.
This expanded radial type of distribution system will be effective enough to
meet the expansion and development requirements of BIL Subdivision for the
year to come. To effectively meet the said requirements, it shall conform to the
proper choice of equipment for the case of power distribution.
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Calculation of Primary Line Main Fuse Cutout No. 1 at Pole No. 1
Tabulation Load
Transfo rmer No. Pole No. A B C1 002 75
2 003A 753 004A 75
4 005 37.55 007A 20
6 009 50
7 011 50
8 007 309 007 30
10 007 3011 003D 37.5
12 010 20Total 180 175 175
Total KVA per phase:
Phase A: 180KVA
Phase B: 175KVA
Phase C: 175 KVA
Solving for the total KVA in the Feeder
KVAT = 3 (Highest KVA/)
= 3 (180)
KVA T = 540 KVA
Solving for Feeder Line Current
I = KVAT/ 3 (Primary Voltage)
= 540/3 (13.2)
I = 23.62 Amp.
For Fuse Rating:I t = ( I ) 3 0 0 %
= 23.62 (300%)I t = 70.86 Amp.
Use = 3 - 80 A Fuse cutout at pole No. 1
For the rating and lightning:
E L = 1 3 . 2 K V /3
= 7 . 6 2 K V
U s e 3 - 1 0 K V s t a t i o n t y p e L i g h t n i n g A r r e s t e r ,
1 2 7 m m d i s t a n c e f r o m b u s h i n g
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Calculation of Primary Line Fuse Cutout No. 2 at Pole No. 4
Tabulation Load
Transfo rmer No. Pole No. A B C1 002 75
2 003A 754 005 37.5
11 003D 37.5
Total 75 75 75
Total KVA per phase:
Phase A: 75KVA
Phase B: 75KVA
Phase C: 75 KVA
Solving for the total KVA in the Feeder
KVAT = 3 (Highest KVA/)
= 3 (75)
KVA T = 225 KVA
Solving for Feeder Line Current
I = KVAT/ 3 (Primary Voltage)
= 225/3 (13.2)
I = 9.84 Amp.
For Fuse Rating:I t = ( I ) 3 0 0 %
= 9.84 (300%)I t = 29.52 Amp.
Use = 3 - 30 A Fuse cutout at pole No. 4
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Calculation of Primary Line Fuse Cutout No. 3 at Pole No. 3
Tabulation Load
Transfo rmer No. Pole No. A B C3 004A 75
5 007A 206 009 50
7 011 50
12 010 20Total 75 70 70
Total KVA per phase:
Phase A: 75KVA
Phase B: 70KVA
Phase C: 70 KVA
Solving for the total KVA in the Feeder
KVAT = 3 (Highest KVA/)
= 3 (75)
KVA T = 225 KVA
Solving for Feeder Line Current
I = KVAT/ 3 (Primary Voltage)
= 255/3 (13.2)
I = 9.84 Amp.
For Fuse Rating:I t = ( I ) 3 0 0 %
= 9.84 (300%)I t = 29.82 Amp.
Use = 3 - 30 A Fuse cutout at pole No. 3
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Table of General Information
Transformer No Residential Load Commercial
Load
Institutional
Load
Industrial
LoadClass A Class B Class C
1 13
2 9 12
3 24 1
4 43
5 21
6 4
7 12 25
8 1
9 1
10 111 1
12 2
Total 22 48 89 4 4 1
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Tabulation of Connection IV Pole
Pole Residentia
Commerci
Institution
Industrial
001
002 5003 4
003-A 3
003-B 3
003-C 3
003-D 3 1
003-E 8
004 4
004-A 7004-B 11
004-C 6 1
005 8
005-A 7
006 5
006-A 7
006-B 6
006-C 6007 7 1
007-A 9
007-B 2
007-C 3
008 2
009 2
011 15
011-A 12
011-B 9
Total 153 4 2 1
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Summary of Total KVA
A. Residential Customers C. Commercial Customer
B. Industrial Customers
Transformer No.8 30
9 30
10 30
Total 90
Transformer No. KVA
1 75
2 75
3 50
4 37.5
5 20
7 50
Total 307.5
Transformer No. KVA
6 50
Total 50
D. Institutional Customer
Transformer No. KVA
3 25
11 37.5
12 20
Total 82.5
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Single Line Diagram of 500 KVA Substation
500 KVA 3 phase transformerprimary voltage 13200 voltssecondary voltage 7620 volts
80 A Main fuse cutout
3 phase 4 wireMain Feeder
Single Phase DistributionTransformer
Single Phase DistributionTransformer
Three phase DistributionTransformer
69KV Bus
Fuse cutout No. 230 A
Fuse cutout No. 330 A
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BILL OF MATERIALS
Construction of 8 poles with -3 phases primary lines and 7 poles with single phase
secondary lines.
Descriptions UnitPrice
NOOFITEMS
No ofPole
Extendedcost
Anchor, Expanding, 10,000 Lbs, 8 Way, GalvanizedSteel
1,422.96 6 8 68,302.08
Bolt, Carriage 3/8" X 4-1/2" 14.49 2 8 231.84
Bolt, Machine, 1/2" X 6" 34.11 2 8 545.76
Bolt, Machine, 5/8" X 12" 69.90 1 8 559.20
Bolt, Machine, 5/8" X 16" 114.66 2 8 1,834.56
Bolt, Single Upset, 5/8" X 12" 171.03 1 8 1,368.24Brace, Crossarm, 28" Steel or Wood (Each) 165.06 2 8 2,640.96
Brace, Crossarm, 60" - 18" Drop (Pair) 1,263.87 1 8 10,110.96
Insulator, Pin Type, Porcelain, ANSI Class 55 - 3 225.00 6 8 10,800.00
Nut, Lock, Mf Type, 3/8" 13.08 2 8 209.28
Nut, Lock, Mf Type, 1/2" 15.39 2 8 246.24
Nut, Lock, Mf Type, 5/8" 18.15 3 8 435.60
Rod, Armor, Preformed, For #2 ACSR, Single Set 357.24 7 8 20,005.44
Lag, Screw, 1/2" X 4" 24.00 8 8 1,536.00
Wire, Tie, Aluminum, Alloy, Soft, #4 AWG (Ft.) 7.26 9 8 522.72
Bolt, Oval Eye, 3/4" X 10" 267.93 6 7 11,253.06
Pin, Crossarm, Steel, 5/8" X 10-3/4" 732.45 6 7 30,762.90
Insulator, Spool, 1-3/4", ANSI Class 53 - 2 45.00 1 7 315.00
Washer, Round, 1-3/8" Dia. X 12 Ga. 13.08 2 7 183.12
Crossarm, Wood, 3-3/4" X 4-3/4" X 10' 3,990.00 1 7 27,930.00
Crossarm, Wood, 3-1/2" X 4-1/2" X 8' 2,595.60 1 7 18,169.20
Total 207,962.16
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Construction of 2 poles with -3 phase primary lines and single phase secondary lines. With
Pole Type Conventional, 20 KVA Transformer
Construction of 2 poles with -3 phase primary lines and single phase secondary lines. With
Pole Type Conventional, 37.5 KVA Transformer
Bolt, Machine, 5/8" X 12" 69.90 2 2 279.60
Washer, Square, Flat 2-1/4" X 2-1/4" X 3/16" 20.55 2 2 82.20
Connector, Compression, #1/0 - #2/0 ACSR Run To #1/0 - #2/0 199.74 4 2 1,597.92
Transformer, Pole Type, Conventional, 15 KVA 84,300.00 2 -
Transformer, Pole Type, Conventional, 20 KVA 104,147.19 2 -
Transformer, Pole Type, Conventional, 30 KVA 123,858.00 2 -
Transformer, Pole Type, Conventional, 37.5 KVA 138,747.00 1 2 305,621.22
Transformer, Pole Type, Conventional, 50 KVA 152,810.61 1 2 -Transformer, Pole Type, Conventional, 75 KVA 236,760.00 2 -
Clamp, Hot Line, #2 - #4/0 ACSR Main to #2 - #4/0 417.78 1 2 835.56
Connector, Split Bolt 534.15 1 2 1,068.30
Wire, Ground, Aluminum Ec. Grade, #4 (Ft.) 13.23 6 2 158.76
Cutout And Arrester Combination W/ Load Break 15,019.98 1 2 30,039.96
Cutout And Arrester Combination 12,101.04 1 2 24,202.08
Nut, Lock, Mf Type, 5/8" 18.15 2 2 72.60
Rod, Tapping, Preformed, For #2/0 ACSR 176.01 1 2 352.02
Total 58,689.00
Bolt, Machine, 5/8" X 12" 69.90 2 2 279.60
Washer, Square, Flat 2-1/4" X 2-1/4" X 3/16" 20.55 2 2 82.20
Connector, Compression, #1/0 - #2/0 ACSR Run To #1/0 - 2/0 199.74 4 2 1,597.92
Transformer, Pole Type, Conventional, 15 KVA 84,300.00 2 -
Transformer, Pole Type, Conventional, 20 KVA 104,147.19 2 208,294.38
Transformer, Pole Type, Conventional, 30 KVA 123,858.00 2 -
Transformer, Pole Type, Conventional, 37.5 KVA 138,747.00 1 2 -
Transformer, Pole Type, Conventional, 50 KVA 152,810.61 2 -
Transformer, Pole Type, Conventional, 75 KVA 236,760.00 2 -
Clamp, Hot Line, #2 - #4/0 ACSR Main to #2 - #4/0 417.78 1 2 835.56
Connector, Split Bolt 534.15 1 2 1,068.30
Wire, Ground, Aluminum Ec. Grade, #4 (Ft.) 13.23 6 2 158.76
Cutout And Arrester Combination W/ Load Break 15,019.98 1 2 30,039.96
Cutout And Arrester Combination 12,101.04 1 2 24,202.08
Nut, Lock, Mf Type, 5/8" 18.15 2 2 72.60
Rod, Tapping, Preformed, For #2/0 ACSR 176.01 1 2 352.02
Total 364,310.22
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Construction of 3 poles with -3 phase primary lines and single phase secondary lines. With
Pole Type Conventional, 50 KVA Transformer
Construction of 3 poles with -3 phase primary lines and single phase secondary lines. With
Pole Type Conventional, 75 KVA Transformer
Bolt, Machine, 5/8" X 12" 69.90 2 3 419.40
Washer, Square, Flat 2-1/4" X 2-1/4" X 3/16" 20.55 2 3 123.30
Connector, Compression, #1/0 - #2/0 ACSR Run To #1/0
- #2/0199.74 4 3 2,396.88
Transformer, Pole Type, Conventional, 15 KVA 84,300.00 3 -
Transformer, Pole Type, Conventional, 20 KVA 104,147.19 3 -
Transformer, Pole Type, Conventional, 30 KVA 123,858.00 3 -
Transformer, Pole Type, Conventional, 37.5 KVA 138,747.00 3 -
Transformer, Pole Type, Conventional, 50 KVA 152,810.61 3 -
Transformer, Pole Type, Conventional, 75 KVA 236,760.00 1 3 1,253.34
Clamp, Hot Line, #2 - #4/0 ACSR Main to #2 - #4/0 417.78 1 3 1,253.34
Connector, Split Bolt 534.15 1 3 1,602.45
Wire, Ground, Aluminum Ec. Grade, #4 (Ft.) 13.23 6 3 238.14
Cutout And Arrester Combination W/ Load Break 15,019.98 1 3 45,059.94
Cutout And Arrester Combination 12,101.04 1 3 36,303.12
Nut, Lock, Mf Type, 5/8" 18.15 2 3 108.90
Rod, Tapping, Preformed, For #2/0 ACSR 176.01 1 3 528.03
89,286.84
Bolt, Machine, 5/8" X 12" 69.90 2 3 279.60Washer, Square, Flat 2-1/4" X 2-1/4" X 3/16" 20.55 2 3 82.20
Connector, Compression, #1/0 - #2/0 ACSR Run To #1/0 -#2/0
199.74 4 3 1,597.92
Transformer, Pole Type, Conventional, 15 KVA 84,300.00 - -
Transformer, Pole Type, Conventional, 20 KVA 104,147.19 - -
Transformer, Pole Type, Conventional, 30 KVA 123,858.00 - -
Transformer, Pole Type, Conventional, 37.5 KVA 138,747.00 - -
Transformer, Pole Type, Conventional, 50 KVA 152,810.61 1 3 473,520.00
Transformer, Pole Type, Conventional, 75 KVA 236,760.00 1 3 -
Clamp, Hot Line, #2 - #4/0 ACSR Main to #2 - #4/0 417.78 1 3 835.56
Connector, Split Bolt 534.15 1 3 1,068.30
Wire, Ground, Aluminum Ec. Grade, #4 (Ft.) 13.23 6 3 158.76
Cutout And Arrester Combination W/ Load Break 15,019.98 1 3 30,039.96
Cutout And Arrester Combination 12,101.04 1 3 24,202.08
Nut, Lock, Mf Type, 5/8" 18.15 2 3 72.60
Rod, Tapping, Preformed, For #2/0 ACSR 176.01 1 3 352.02
Total 88,033.50
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Construction of 1 poles with -3 phase primary lines, With 3 - Pole Type Conventional, 30
KVA Transformer
Washer, Square, Flat 2-1/4" X 2-1/4" X 3/16" 20.55 2 1 41.10
Crossarm, Wood, 3-3/4" X 4-3/4" X 8' 3,210.00 1 1 3,210.00
Bolt, Carriage 3/8" X 4-1/2" 14.49 2 1 28.98Lag, Screw, 1/2" X 4" 24.00 4 1 96.00
Bolt, Double Arming, 5/8" X 14" 136.50 4 1 546.00
Connector, Compression, #1/0 - #2/0 ACSR Run To #1/0 #2/0 199.74 3 1 599.22
Connector, Split Bolt 534.15 3 1 1,602.45
Clamp, Hot Line, #2 - #4/0 ACSR Main to #2 - #4/0 417.78 3 1 1,253.34
Transformer, Pole Type, Conventional, 30 KVA 123,858.00 3 1 371,574.00
Conductor, Bare, ACSR #2, AWG. 6/1 (MTS.) 39.03 12 1 468.36
Insulator, Spool, 1-3/4", ANSI Class 53 - 2 45.00 3 1 135.00
Cutout And Arrester Combination W/ Load Break 15,019.98 3 1 45,059.94
Brace, Crossarm, 28" Steel or Wood (Each) 165.06 2 1 330.12
Bracket, Transformer, Secondary, W/ 1-3/4" Spool 511.89 2 1 1,023.78
Bracket, Cluster Type 511.89 2 1 1,023.78
Nut, Lock, Mf Type, 3/8" 13.08 2 1 26.16
Nut, Lock, Mf Type, 5/8" 18.15 2.00 1 36.30
Wire, Tie, Aluminum, Alloy, Soft, #4 AWG (Ft.) 7.26 6.00 1 43.56
Rod, Armor, Preformed, For #2 ACSR, Single Set 357.24 3.00 1 1,071.72
Total 424,889.73
Wires and poleswires
primary
Conductor, Bare, ACSR #2, AWG. 6/1 (MTS.) 39.03 1,100.00 42,933.00
secondary
Conductor, Bare, ACSR #2, AWG. 6/1 (MTS.) 39.03 1,200.00 46,836.00
Neutral
Conductor, Bare, ACSR #2, AWG. 6/1 (MTS.) 39.03 1,500.00 58,545.00
148,314.00
Pole
Primary
Pole, Steel, 35 ft. 23,000.00 391,000.00 391,000.00
Secondary
Pole, Steel, 30 ft. 15,000.00 165,000.00 165,000.00
556,000.00
Total Php2,589,955.33
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Some Computation of Individual Transformers:
Equipment No. 0011 (tap on the pole No. 010 institutional load (85% PF, 90% DF)
Pole No. Load Description KVA DF(%) MDKVA
010 Park and Street Lighting 34.4 90% 30.98
Calculations:
Use 1 37.5 KVA single transformer, tap at pole no. 010
Primary Voltage 13.2/7.62 KV
Secondary Voltage 115/230 V
For use cutout:
Use 1- 8 A fuse link @ 100 A fuse cutout