Not all power lines forming the grid, their segments and lands where the structures stand were acquired, designated, and built by NAPOCOR, TransCo, or NGCP some transmission lines, power line segments or structures (towers, poles, including replacement structures) were built by private companies, especially those originating from power plants such as the Subic-MSPP Transmission Line. The transmission system and related facilities are operated and maintained by the National Grid Corporation of the Philippines (NGCP), and owned by the National Transmission Corporation (TransCo), a government-owned company spun off from the National Power Corporation (NAPOCOR/NPC) which used to operate, maintain, and own the country's power grid until March 1, 2003. Off-grid islands with multiple power sources (local power plants and offshore power barges) have transmission systems operating at 69 kV. The Luzon and Visayas grids are interconnected through the 350 kV DC HVDC Leyte-Luzon transmission line, while the Mindanao Grid remains isolated until the completion of a HVDC link from Cebu to Lanao del Norte. Luzon Grid uses voltages of 69 kV, 115 kV, 230 kV, and 500 kV, while the Visayas and Mindanao grids use 69 kV, 138 kV, and 230 kV. The transmission grid, operating at 69 kV, 115 kV, 138 kV, 230 kV, and 500 kV, is divided into three grids, the Luzon Grid, the Visayas Grid, and the Mindanao Grid.
The grid frequency is at 60 Hz, the same as with North America, Taiwan and west Japan, but different from most of Southeast Asia which uses 50 Hz. The Philippine power grid is divided into a transmission, sub-transmission, and distribution sector. An under-construction Hermosa-San Jose 500 kV transmission line, which intersects with the 230 kV line mentioned before on Calumpit, Bulacan portion of the viaduct, can be seen along the viaduct. The distribution voltages are stepped down to 230 V single-phase for household consumption commercial and light industrial users are generally supplied at 127/220 or 254/440 V three-phase.Ī segment of the Hermosa-Duhat-Balintawak (Quezon) 230 kV transmission line along Candaba Viaduct of North Luzon Expressway in Apalit, Pampanga. Lines usually have one to three conductors strung on poles, and usually has a neutral line six or more wires usually occur on lines carrying multiple circuits from a substation.
Lines are usually mounted on steel, concrete or wood poles, and feed onto distribution substations and large industrial customers.ĭistribution networks operate 6.28, 7.97/13.8, 13.2/23 and 20/34.5 kV, but the most common is 7.97/13.8 kV.
In between the transmission and distribution networks is the sub-transmission network, operating at either 69 kV or 115 kV. The number of transmission structures in the Philippines (towers and poles) are approximately 27,473 structures and number may be increased as more structures are constructed. 500 kV: Bulk transmission voltage in Luzon, using quadruple-bundle conductors.230 kV: Main transmission voltage in Luzon, and bulk transmission voltage in Visayas and Mindanao.Usually single-conductor, some double-bundle 138 kV: Main transmission voltage in Visayas and Mindanao.Generally used for sub-transmission (see below) 115 kV: Used in parts of Ilocos for transmission.
The transmission network in the Philippines uses a mix of lattice towers and steel, concrete or wood poles, the latter common on power lines placed along road or railroad rights of way in urban areas and on lines where most of their portions have lower clearance between the ground, buildings, and vegetation and the line. It is intended to be a guide for mapping power lines from aerial imagery and on-the-ground observation. This page aims to coordinate the efforts of mapping electricity-related objects in the Philippines.
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