Английская Википедия:Concepcion–Clark Transmission Line

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Шаблон:Short description Шаблон:Multiple issues Шаблон:Infobox power transmission line The Concepcion–Clark Transmission Line (kənˌsɛpsiˈoʊn–klɑrk trænˈsmɪʃən laɪn)

(abbreviated as 8LI1CON-CLK, 8LI2CON-CLK, CCTL or in pole's reference tags; 8LI1CON-CL1 and 8LI1CON-CL2) is a 230,000 volt, double-circuit transmission line in Tarlac and Pampanga, Philippines that connects Concepcion Substation of National Grid Corporation of the Philippines (NGCP) and Clark Substation of Clark Electric Distribution Corporation (CEDC).

History

The Concepcion–Clark Transmission Line went into service on August 24, 2008. It was built to ensure a reliable supply for Texas Instruments in Clark. It is operated and maintained by the privately owned National Grid Corporation of the Philippines (NGCP) since January 15, 2009, and previously by government-owned National Transmission Corporation (TransCo). It is also owned by TransCo since its completion in August 2008. Line 1 was energized at 69kV on July 11, 2008, and line 2 on August 24, 2008, and were later uprated to their current voltage of 230kV on December 9 and November 30, 2009, respectively.

Route description

The Concepcion–Clark Transmission Line passes through the municipalities of Concepcion and Bamban in Tarlac and the city of Mabalacat in Pampanga. It is located within the service area of NGCP's North Luzon Operations and Maintenance (NLOM) District 6 (South Central Plain).

The transmission line starts at Concepcion Substation, parallels with San Manuel–Concepcion–Mexico transmission line, turns right upon entering Subic–Clark–Tarlac Expressway (SCTEx) and run parallel into the said expressway until Clark North Exit. It then intersects with San Manuel–Concepcion–Mexico line before passing through Concepcion Exit. Between Concepcion and New Clark City exits, line 2 of the transmission line passes through Seaoil gas station and CityMall SCTEx while line 1 passes through PTT gas station. Upon approaching New Clark City exit and passing through Sacobia River, the line will utilize the western side of SCTEx. It again utilize both sides of the expressway after passing the said river, continues straightforward and exits the expressway. At the exit of the lines, the ground wires had a marker balls. This is because the line is located near the Clark Airport and airspace. CAAP informs NGCP to place marker balls in near Clark Airport, and ends at Clark Substation.

Technical description

The transmission line consists of 185 steel poles which are used from its entry to SCTEx until its approach to New Clark City exit and after Sacobia River to Clark North Exit, 20 lattice towers from Concepcion Substation until its entry to SCTEx, upon passing through New Clark City exit and Sacobia River and at its terminus at Clark Substation, and 2 portal towers at the power line's intersection with San Manuel–Concepcion–Mexico transmission line totaling to 207 transmission structures. Lattice towers have six insulators, with each side carry both circuits, while steel poles separates the transmission line's lines 1 and 2 as the portion of a power line that uses poles utilize both sides of SCTEx and each pole have three insulators. Steel poles can either have a flag (suspension and anchor variants) or triangle tower designs. It is a double-circuit, unbundled power line and originally had a voltage of 69kV before being energized to its current voltage of 230kV.

The steel poles are made of galvanized steel and they have a height of 40-70m tall. It is installed on base or foundation of the steel pole (pedestal). The installation of structures takes less than 2 months, while the completion of a right of way (ROW) or portion of a transmission line which involves structures are all installed or placed on lands already acquired and designated where they are located on that ROW depends on the power line portion's amount of structures. First, on a land where the steel pole will be located, the precast concrete foundation laid underground and a cement is added to create the pole's pedestal. Second, the pedestal laid ground, then backfill up some of remaining holes between the gap. Third, the poles were laid in three to six segments, the butt segment (the lowermost), mid segment which are between the butt and top segments, and the top segment. The top segment is where a steel crossarm placed for suspension steel poles with flag design. Fourth, the insulators were attached.

Lattice and portal towers are also erected by segments and made of steel like steel poles. Lattice towers have four pedestals forming on a square shape, erected by segments and the top segment has crossarms on both sides, and portal towers used to intersect the line with San Manuel–Concepcion–Mexico transmission line have four pedestals and on a shape of a letter "T" (reference code is (8LI1CON-CL2)032A) and (8LI2CON-CL2)032A). The insulators are placed on crossarms on both sides of the lattice tower's top segment and horizontal lattice crossarm of a portal tower. The steel poles' design is based on Hermosa–Duhat–Balintawak transmission line.

The name of the structures' design used on the transmission line are: Ben (flag anchor steel pole), Alyssa (triangular suspension steel pole), Cabadbaran (flag suspension steel pole), and Lexi (lattice tower). The abbreviation of these design is: FD (flag design), TD (triangular design), APD (anchor pole design), LTD (lattice tower design), and PTD (portal tower design).

Electrical Information of Concepcion–Clark Transmission Line

Current	Volts	Heading	Bundle	Amps	Number of structures
not measured	230,000	South and West	Single	not measured	207 (185 steel poles, 20 lattice towers, and 2 portal towers)

Insulator information

Type of steel pole or lattice tower	Height	Weight	Insulator
Suspension steel pole (triangle and asymmetrical)	40-70m tall	7+ tons	3 braced line post insulators made of 21 porcelain discs placed in triangular position. The support of overhead ground wire (OHGW) is the steel point on top and attached by clamp.
Suspension steel pole (flag)			3 braced line post insulators made of 14-21 porcelain discs facing in one direction and forming the pole a flag shape, and a steel crossarm used to support the overhead ground wire (OHGW) at the steel pole's top segment.
Anchor steel pole (flag)			Horizontal dead-end insulators made of 15 porcelain discs with 3 horizontal porcelain insulators at the center.
Suspension lattice towers			3 vertical insulators consisting of 14 porcelain discs.
Anchor lattice towers			3 dead-end horizontal insulators with 15 porcelain discs.
H-frame anchor steel poles			4 vertical pole-mounted porcelain insulator with 14 porcelain discs and horizontal dead-end insulators with 15 discs.

Gallery

• A portion of the transmission line near Concepcion Exit.

  A portion of the transmission line near Concepcion Exit.

• Portion of the transmission line's line 2 passing through Seaoil gas station and CityMall SCTEx in Concepcion, Tarlac.

  Portion of the transmission line's line 2 passing through Seaoil gas station and CityMall SCTEx in Concepcion, Tarlac.