national grid five mile road station project exhibit e-1

National Grid Exhibit E-1: Description of Transmission Facility Five Mile Road Substation Project Article VII Application

National Grid

Five Mile Road Station Project

Exhibit E-1

Description of Proposed Transmission Facility

National Grid Exhibit E-1: Description of Transmission Facility Five Mile Road Substation Project Article VII Application

TABLE OF CONTENTS

Section Page

EXHIBIT E-1: DESCRIPTION OF PROPOSED TRANSMISSION FACILITY

E-1.1 Overview of Current Transmission Facilities ......................................................... 1

E-1.2 Description of Proposed Facilities .......................................................................... 3

E-1.2.1 Introduction....................................................................................................... 3

E-1.2.2 Proposed Station ............................................................................................... 3

E-1.2.3 Proposed Transmission Line Modifications ..................................................... 7

TABLES

Table E-1-1: Existing Conductor and Shieldwire Information ............................................................. 2

Table E-1-2: Proposed Conductor and Shieldwire Information ......................................................... 11

National Grid 1 Exhibit E-1: Description of Transmission Facility Five Mile Road Station Project Article VII Application

EXHIBIT E-1: DESCRIPTION OF PROPOSED TRANSMISSION

FACILITY

E-1.1 Overview of Current Transmission Facilities

The Homer City – Stolle Road Line 37(“Line 37”) is a 200 mile 345 kV transmission line owned in

part by both New York State Electric & Gas Company (“NYSEG”) and National Grid that was

certified by the New York State Public Service Commission (“Commission” or “PSC”) under

Article VII of the Public Service Law (“PSL”) and was placed into service in 1978. The National

Grid-owned portion of the line, a 37.5 mile section, begins at Structure 1 at the south side of

Cattaraugus Creek in the Town of Yorkshire and continues south, traversing the towns of Machias,

Franklinville, Humphrey, Hinsdale and Portville (all within Cattaraugus County) and terminates at

NYSEG Tower C-42 in the Town of Genesee, Allegany County, New York.

There are 264 structures along the National Grid portion of Line 37, consisting of five (5) steel

monopoles, fifteen (15) lattice towers and 244 wood structures. Of the fifteen steel lattice towers,

three are suspension flex towers and twelve are dead-end square base towers; the square base towers

are used on all heavy angles (greater than 20°). The wood structures use two-pole H-frames for all

tangent structures and three-pole structures for all “light” angles (less than 20°). All structures are

single circuit construction on the National Grid portion of Line 37 except for one section consisting

of three double-circuit steel monopole, located approximately 5 miles south of the proposed Five

Mile Station Site where the 37 line crosses Olean Creek and State Highway 17/Interstate 86; the

Homer Hill – Bennett Road Line 157 115 kV line is the second circuit in this section. The 345 kV

right-of-way (“ROW”) in the vicinity of the proposed station is a 130 foot wide easement with Line

37 offset 10 feet west of the ROW centerline.

The Gardenville – Homer Hill Line 152 (“Line 152”), a 65.5 mile 115 kV transmission line built in

1967, originates at the Gardenville Station in the Town of West Seneca, Erie County, New York and

terminates at the Homer Hill Station located in the Town of Olean, Cattaraugus County, New York.

Line 152 traverses the towns of West Seneca, Orchard Park, Boston, Concord, Sardinia, Yorkshire,

Machias, Franklinville, Humphrey, Hinsdale, Allegany and Olean. The 620 structures on this

transmission line are primarily double-circuit steel lattice towers. The second circuit carries the

Gardenville - Arcade Line 151, a 115kV transmission line, for approximately 35 miles from the

Gardenville Station to the Arcade Station in Yorkshire, New York. From the Arcade Station, the

second circuit carries the Arcade-Homer Hill Line 167, a 115kV transmission line, for

approximately 30 miles to Homer Hill Station. The flex towers are used for the tangent structures


and the square base towers are used to support the line angles. There are only 36 single circuit

structures on the impacted 115kV circuits. As the existing flex towers reach the end of their service

life, they are replaced with two-pole, double-circuit, wood davit-arm suspension structures.

As part of the proposed Project, the Arcade – Homer Hill Line 167 (eastern circuit) and the

Gardenville – Homer Hill Line 152 (western circuit) 115 kV lines will be modified. The right-of-

way (“ROW”) for the double circuit 115 kV tower line at the Project site is a 90 foot-wide easement,

with the structures located on the ROW centerline.

The 345 kV ROW and the 115 kV ROW are adjacent to each other at the Project site and since the

land which was purchased for the station borders the west side of the 115 kV ROW to the west, no

additional land must be purchased for the transmission line work.

The existing conductor and shieldwire information for all three transmission circuits in the vicinity

of the Project site are shown in Table E-1-1 below:

Table E-1-1: Existing Conductor and Shieldwire Information

Homer City - Stolle Road Line 37

Conductor Shieldwire

Code Name: ‘Bunting’ -

Type Bundled 1192.5 KCM 45/7 ACSR (2

per bundle)

2-7/16” EHS, Steel

Bethanized1

Diameter 1.302 in. 0.435 in.

Weight/Foot 1.344 lb./ft. 0.399 lb./ft.

Design Tension at NESC2 Heavy

Initial

10,000 lbs. per sub /20,000 lbs.per

phase

6,000 lbs.

Rated Breaking Strength (“RBS”) 32,000 lbs. 20,800 lbs.

1Extra High Strength Steel, or “EHS”.

2 National Electrical Safety Code, or “NESC”.


Gardenville– Homer Hill Line # 152/ Arcade – Homer Hill Line # 167


Code Name ‘Oriole’ -

Type 336.4 MCM 30/7ACSR 2-3/8” HSS



Design Tension at NESC Heavy

Initial

4,700 lbs. Unknown

RBS 17,300 lbs. 10,800 lbs.

E-1.2 Description of Proposed Facilities

E-1.2.1 Introduction

National Grid proposes to construct i) a new 345kV/115kV transmission station; ii) two new 345kV

transmission loops, each approximately 250 feet long, to extend from the station to the existing 345

kV Homer City – Stolle Road Line 37; and iii) four new 115 kV loop connections, each

approximately 650 feet long, to extend from the new station to the two existing 115 kV transmission

lines (collectively, the “Five Mile Road Station Project” or the “Project”). The proposed station and

transmission loops will be constructed, owned, operated and maintained by National Grid. The

station is proposed to be located on an 18.9 acre parcel at 4580 Five Mile Road in the Town of

Humhrey, Cattaraugus Couty, New York. The station will be located directly to the west of three

existing transmission lines: the 345 kV Homer City–Stolle Road Line 37; the 115 kV Gardenville–

Homer Hill Line 152; and the 115 kV Arcade–Homer Hill Line 167. The Homer City–Stolle Road

Line 37 will be split between Structure 171 and Structure 172 to source the new station. The station

will help support the 115 kV system in the Southwest Region by supplying power to the

Gardenville–Homer Hill Line 152 and the Arcade–Homer Hill Line 167; these lines will be split

between double circuit Structures 547 and 548.

E-1.2.2 Proposed Station

The proposed station is to be constructed on an 18.9-acre parcel owned by National Grid.

Approximately 14 acres of the parcel will be graded for the new station. The station footprint will


consist of a fenced area covered with crushed stone measuring approximately 468 feet by 421 feet

(approximately 4.4 acres). The following equipment and structures will be installed within the fence

line: (i) electrical transformers, conductors, breakers, switches, and instrument transformers mounted

on steel structures placed on reinforced concrete foundations; (ii) a control house containing

protective relaying, double-circuit power systems, remote monitoring and communications systems;

(iii) the 345 kV and 115 kV terminal structures and the 115 kV intermediate strain bus support

structures; and (iv) a 60 foot tall monopole microwave tower constructed for communication

purposes directly south of the control house.

The station will consist of two sections: the 345 kV section and the 115 kV section. The two

sections will be connected by a 345 kV/115 kV power transformer. The 345 kV section will be fed

from the Homer City–Stolle Road Line 37 and will consist of a 4 breaker ring bus. Eight air core

shunt reactors (two per phase and two spares) will be connected to the bus. The 345 kV section

feeds the power transformer, which in turn feeds the 115 kV section. The 115 kV section consists of

three bays of a breaker and half bus design, two bays of which will have three breakers and the third

bay consisting of two breakers with space for a future third breaker if needed for expansion. Two of

the bays will feed the Gardenville–Homer Hill Line 152 and Arcade–Homer Hill Line 167

transmission lines, while the third bay will be connected to the transformer on one side, providing a

position for a future transmission line tie on the other. A 25.4 MVAr three phase capacitor bank will

also be connected to the bus.

The station will be divided into redundant power, control and protection systems which will require

redundant conduits and in-ground cable trenches to enhance reliability.

The tallest structures within the station fence line will be the two 345 kV terminal structures, where

the Homer City–Stolle Road Line 37 will “loop in and loop out” of the station. These terminal

structures will be 95 feet high. The next tallest structure will be the approximately 60 feet tall

microwave tower and 115 kV terminal structures.

A crushed stone access road approximately 200 feet long by 20 feet wide will also be constructed

from Five Mile Road into a parking/turn-around area adjacent to the south side of the station. The

parking/turn-around area will also be covered with crushed stone and will measure 300 feet long by

60 feet wide.

Landscaping will consist of a berm which will be constructed along the south boundary of the parcel

to provide screening. The berm will be planted with assorted trees and shrubs. Other areas will be

seeded to provide soil stabilization.


The following describes the equipment and structures in more detail. Plans for this station and

transmission work are illustrated in Exhibit 5.

The Power Transformer will be a single unit with the following ratings: 268/358/448 MVA,

13.8/120/345 kV Load Tap Changer. The transformer will be supported on a reinforced

concrete foundation. The transformer contains approximately 32,000 gallons of mineral oil

used for insulation. Containment will be constructed around the transformer of sufficient

volume to retain the transformer’s entire contents in the event of a catastrophic spill.

The four 345 kV circuit breakers will be independent pole operated, SF6 gas breakers. Each

circuit breaker will contain approximately 365lbs. of SF6 gas (total 1,460 lbs.).

The nine 115 kV circuit breakers will be gang-operated, SF6 gas breakers. Each circuit

breaker will contain approximately 125 lbs. of SF6 gas (total 1,125 lbs.).

There will be 345 kV and 115 kV disconnect switches supported by galvanized steel

structures. The 345 kV disconnects will be motor operated, while the 115 kV disconnects

will be manually operated.

Strain bus consisting of dual 2500 KCM all-aluminum cable will run between the 115 kV

terminal structures and will include an intermediate support structure of the same design as

the terminal structures. The strain bus loading within the station will follow the same

standards as the transmission line design loads.

Rigid bus will be utilized within the bays to connect the various breakers, transformer and

other equipment. The bus will be four-inch and six-inch diameter aluminum tube. The bus

will be designed to the requirements of Institute of Electrical and Electronics Engineers

(“IEEE”) Standard 605-2008 “Guide for Design of Substation Rigid-Bus Structures.”

The IEEE standards will be utilized in the electrical design of the proposed station. One of

the most frequently utilized IEEE standards is IEEE C37, which includes numerous sub-

categories that will cover the equipment within the proposed station. NERC standards will

also be applied to the station.

The microwave tower will be approximately 60 feet tall, consisting of a galvanized steel


monopole construction.

The terminal or take-off structures for both the 345 kV and 115 kV transmission lines

entering the station will be of an “A” frame construction using galvanized steel with

reinforced concrete foundations. The expected structure height will be 95 feet for the 345 kV

structures and 70 feet for the 115 kV structures. The terminal structures will be designed to

incorporate supports for the appropriate disconnect switches. These structures will be

designed in accordance with the NESC using the same loadings as described under the

transmission facilities. NESC specifies both the minimum structural loads to determine the

required structural capacity and the clearances to energized parts and wires. Typical

requirements defined by the NESC include clearances to ground, adjacent transmission lines,

railroads, buildings and other facilities.

Approximately eight lightning masts consisting of galvanized steel tubular poles on concrete

foundations, will provide protection for the equipment from lightning strikes. Five of the

masts will measure 95 feet tall and three will measure 70 feet tall. Additional lightning

protection will be provided by rods on the terminal structures and microwave tower.

The control building will be approximately 32 feet wide by 120 feet long by 20 feet high, and

will be constructed to house the various relays and controls for the station as well as the AC

& DC power panels and the DC batteries. The building will be separated by a wall into two

sections to house two independent and redundant protection systems in conjunction with the

exterior systems. The control building will be an approximately 20 foot high metal-framed,

metal-sided building on a reinforced concrete foundation. The insulated metal walls and roof

will have a high-performance, corrosion-resistant coating. Due to favorable soil conditions,

it is expected that the foundation will consist of reinforced concrete footings and foundation

walls designed to extend below the four foot-deep frost line. The building floor will consist

of a reinforced concrete slab-on-grade with an internal trench system to accommodate a

portion of the cable system running to the panels. Additional cables will be located in

overhead trays. The building will be heated and cooled to maintain an optimal temperature

range for the equipment housed within it. Building design loads will exceed the

requirements of the Building Code of New York State and American Society of Civil

Engineers (“ASCE”) ASCE/SE7-10 Minimum Design Loads for Buildings and Other

Structures. Loading shall include wind, snow and earthquake, as well as all building dead

and live loads. The following summarize the major basic design loadings:

o Occupancy Classification –Use Group U (Utility and Miscellaneous)

http://www.asce.org/Product.aspx?id=2147487569

http://www.asce.org/Product.aspx?id=2147487569


o Occupancy Category– Building Category: Category IV (Essential Facilities)

o Wind: Basic wind speed– 120 miles per hour (mph)

o Snow: Basic snow load – 40 pounds per square foot

o Ice: 0.75 inches with 40 mph concurrent wind gust speed

o Seismic (earthquake): Site Class – D, spectral response acceleration for short period

(Sms) – 0.145g and spectral response acceleration for 1 second (Sm1) – 0.053g

The steel chain link fence surrounding the station will be eight feet high, including seven feet

of fabric and one foot of barbed wire. The fence will be either galvanized steel or aluminum.

Security cameras will be installed along the perimeter of the fence line and on the control

building.

A 300 kilowatt diesel generator will be installed to provide emergency power should the

normal power supply be interrupted. This unit is self-contained and contains a diesel storage

tank within the unit. This tank is protected from leakage with secondary containment

measures.

The switches, bus and other electrical equipment will be supported from galvanized steel

structures with reinforced concrete foundations. The breakers will be supported at-grade on

reinforced concrete foundations. Design loadings including earthquake, wind, ice, short

circuit, dead and live loads will be determined during final design utilizing the ASCE

Manuals and Reports on Engineering Practice Number 113 – Substation Structure Design

Guide.

A concrete trench system will be installed within the station yard to route the cables from the

control building to and between the various pieces of equipment. Redundant (or duplicate)

trench systems will be installed. In locations where the volume of cables is smaller, cable

will be buried below grade using plastic or steel conduits.

Provisions have been made in the station layout to allow for future expansion: (i) space is included

within the existing parcel for a second power transformer, if needed; (ii) one open position is

included should a new 115 kV transmission line be required; and (iii) space has been reserved should

a new 115 kV bay be required in the future.

E-1.2.3 Proposed Transmission Line Modifications

The structure designs for the Project have been developed in accordance with the latest edition of the


NESC, the National Grid Transmission Line Design and Structure Loading criteria, and ROW

considerations such as ROW width, the location of existing facilities and environmental conditions.

The transmission line scope of work required for the new station will involve rerouting the Homer

City – Stolle Road Line 37 into and out of the station by attaching to the two 345 kV terminal

structures. The Arcade – Homer Hill Line 167 and Gardenville– Homer Hill Line 152 will be

rerouted into the low side of the station. All three circuits will “loop in and loop out” of the station

rather than rely upon a “radial tapping” method, meaning there will be full breaks in all of the

mainline conductors. Figures accompanying Exhibit 5 provide cross-sections of these proposed

structures within the Project ROW segments as well as figures representing each structure type

proposed to be installed.

The following scope of work is proposed on Homer City– Stolle Road Line 37:

Install Structure 171 ½, a new cor-ten steel three-pole dead-end pull-off structure (see Figure

5-11) set on three individual reinforced concrete caisson foundations on the centerline of the

existing mainline, approximately 150 feet south of existing Structure 171.

o Approximately 180 circuit feet of 2-Bundle ‘Bunting’ non-specular conductor and 2-

7/16” E.H.S. Shieldwires will be installed from Structure 171 ½ to the northern 345 kV

terminal station structure. See Table E-1-2 below for the proposed design tensions of the

new conductors and shieldwires.

o The preliminary design heights for the three steel poles of new Structure 171 ½ are one

seventy-five foot pole and two (2) eighty-five foot poles. These steel poles will be

supported by six to eight foot diameter reinforced concrete caisson foundations, set to a

depth of approximately twenty feet.

o Seventeen porcelain ball-and-socket insulators will be used on this dead-end structure.

Replace existing Structure 172, a wood two-pole H-Frame suspension structure, with a cor-ten

steel three-pole dead-end pull-off structure (See Figure 5-11) set on three individual reinforced

concrete caisson foundations.

o The western phase of the existing 345 kV mainline currently at Structure 172 is only 17

feet from the edge of Five Mile Road. To avoid placing a steel pole only 17 feet from the

edge of the pavement, new Structure 172 will be shifted to the east an additional 15 feet


based on a 1 degree line angle offset from Structure 173, which would be within the

structure’s design limits and require no modifications to Structure 173.

o Approximately 200 circuit feet of 2-Bundle ‘Bunting’ non-specular conductor and 2-

7/16” E.H.S. Shieldwires will be installed from new Structure 172 to the southern 345 kV

station terminal structure. See Table E-1-2 below for the proposed design tensions of the

new conductors and shieldwires.

o The preliminary design heights for the three steel poles of new Structure 12 are one

ninety foot pole and two one-hundred foot poles. These steel poles will be supported by

eight to ten foot diameter reinforced concrete caisson foundations, set to a depth of

approximately thirty feet.

o Seventeen porcelain ball-and-socket insulators will be used on this dead-end structure.

The existing mainline conductors and shieldwires between Structure 171 and Structure 172

will be removed from new Structure 171 ½ to new Structure 172, approximately 350 circuit

feet.

The following scope of work will be required for the Arcade – Homer Hill Line 167 and

Gardenville –Homer Hill Line 152:

Replace the existing double-circuit structures: Tower 546, a steel lattice flex tower, and

Structure 547, a wood two-pole H-frame structure, with two single-circuit galvanized steel

vertical dead-end structures (see Figure 5-9) set on individual reinforced concrete caisson

foundations on the mainline conductor centerlines.

o Install a total of four new single-circuit structures (see Figure 5-9), identified as Structure

546A (Circuit #152), Structure 546B (Circuit #167), Structure 547A (Circuit #170), and

Structure 547B (Circuit #169).

o Both circuits will take a 90 degree turn from the mainlines at the new vertical dead-end

structures on both the north and south ends of the station to reroute the lines to the west

(back) side of the station, where the 115 kV station terminal structures will be located.


Place two individual double-circuit galvanized steel davit arm dead-end structures set on

reinforced concrete caisson foundations (see Figure 5-10) perpendicular to the two 115 kV

station terminal structures.

o On the north end of the station, new double-circuit Structure 546-1 (see Figure 5-10) will

be located approximately 160 feet north of the station terminal structure.

o On the south end of the station, new double-circuit Structure 547-1 will be installed 260

feet south of the station terminal structure.

The preliminary design heights of all the new 115 kV structures will be eighty-five feet, set

on reinforced concrete caisson foundations with proposed depths of thirty feet for the double-

circuit structures and twenty feet for the single-circuit structures. These foundations will

range between six to eight feet in diameter.

The six 115 kV dead-end structures will utilize sets of ten porcelain ball-and-socket

insulators.

Two approximate 440 circuit foot spans of 795 ACSR 26/7 ‘Drake’ non-specular conductor

with 2-3/8” HSS Shieldwires will run from single-circuit Structures 546A & B to double-

circuit Structure 546-1 on the north end of the station. The new conductors and shieldwires

will then be routed from double-circuit Structure 546-1 to the northern 115 kV station

terminal structure. See Table E-1-2 below for the proposed design tensions of the new

conductors and shieldwires.

The existing approximate 600 circuit feet of conductor and static wires between Structure

546 and Structure 547 will be removed for both 115 kV circuits.

Generally, an individual caisson foundation involves excavating a hole approximately 8 to 10 feet in

diameter to a depth of approximately 15 to 25 feet in order to install a 6 to 8-foot diameter culvert in

a vertical position that serves as the form for the concrete foundations (see Figure 5-15).


Table E-1-2: Proposed Conductor and Shieldwire Information

Homer City – Stolle Road Line 37


Code Name: ‘Bunting’ -

Type Bundled 1192.5 KCM 45/7 ACSR

(2 per bundle)

2-7/16” E.H.S., Steel

Bethanized



Design Tension at NESC

Heavy Initial

6,000 lbs. per sub /12,000 lbs. per

phase

4,000 lbs.

RBS 32,000 lbs. 20,800 lbs.

Gardenville– HH 152/ Arcade – HH 167, Str. 546 A/B to Str. 547 A/B


Code Name ‘Drake’ -

Type 795 MCM ACSR 26/7 2-3/8” HSS



Design Tension at NESC

Heavy Initial

4,000 lbs. 2,500 lbs.

RBS 31,500 lbs. 10,800 lbs.

national grid five mile road station project exhibit e-1

Documents