Electrical Grids in the Philippines
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Questions and Answers

What is the standard voltage for transmission lines in the Visayas and Mindanao grids?

  • 138 kV (correct)
  • 230 kV
  • 115 kV
  • 69 kV
  • How tall are the typical lattice towers or steel poles for 138 kV transmission lines?

  • 5-10 meters
  • 10-15 meters
  • 21-29 meters (correct)
  • 30-40 meters
  • What type of towers are used for 69 kV transmission/subtransmission lines?

  • Medium-size poles
  • Steel poles
  • Lattice towers
  • Hframe towers (correct)
  • Where are 60-138 kV transmission lines typically located according to the National Transmission Corporation (TransCo)?

    <p>Visayas</p> Signup and view all the answers

    In which regions are medium-size poles and Hframe towers commonly used?

    <p>Visayas and Mindanao</p> Signup and view all the answers

    What is the highest voltage level used in the Philippine transmission grids?

    <p>500 kV</p> Signup and view all the answers

    How are the Luzon and Visayas Grids interconnected?

    <p>Via a 350 kV HVDC line</p> Signup and view all the answers

    What voltage level do off-grid islands in the Philippines typically operate at?

    <p>69 kV</p> Signup and view all the answers

    Who operates and maintains the transmission system and related facilities in the Philippines?

    <p>National Grid Corporation of the Philippines (NGCP)</p> Signup and view all the answers

    What voltage levels are typically found in distribution networks in the Philippines?

    <p>7.97/13.8 kV or 20/34.5 kV</p> Signup and view all the answers

    Which grid in the Philippines remains isolated until a planned HVDC link completion?

    <p>Mindanao Grid</p> Signup and view all the answers

    What is the standard supply voltage for homes and small businesses and industries?

    <p>230 V</p> Signup and view all the answers

    Where are nonstandard voltages like 350 kV used?

    <p>HVDC Leyte-Luzon transmission line and submarine cable</p> Signup and view all the answers

    Which type of transformer supplies voltage to large commercial/industrial consumers?

    <p>3-phase transformer</p> Signup and view all the answers

    How are the 254/440 V lines usually connected?

    <p>Directly to a single building</p> Signup and view all the answers

    Which company's distribution network in Cebu uses the 13.2/23 kV voltage?

    <p>VECO</p> Signup and view all the answers

    What is the voltage supplied to high rise buildings?

    <p>127/220 V</p> Signup and view all the answers

    What is the standard voltage used mostly for distribution by Meralco in its coverage area?

    <p>20/34.5 kV</p> Signup and view all the answers

    Where is the 7.97/13.8 kV distribution voltage commonly used?

    <p>Both A and B</p> Signup and view all the answers

    What type of poles are typically used for the 20/34.5 kV distribution network?

    <p>Medium-size poles</p> Signup and view all the answers

    Where are step-down transformers normally mounted in the distribution networks?

    <p>On poles</p> Signup and view all the answers

    What is the standard voltage used for wind farms to collect power from each turbine?

    <p>7.97/13.8 kV</p> Signup and view all the answers

    In what locations are smaller poles typically used in the distribution networks?

    <p>Narrow streets</p> Signup and view all the answers

    What is the purpose of the distribution feeder recloser?

    <p>Interrupting overload and fault current</p> Signup and view all the answers

    Which component of the electrical distribution system is responsible for redirecting or cutting off power flows for load balancing?

    <p>Circuit-breaker switches</p> Signup and view all the answers

    What do protective equipment in the distribution system include?

    <p>Lightning arresters and fuses</p> Signup and view all the answers

    What is the purpose of primary circuits in the electrical distribution system?

    <p>Carrying power from substations to local load areas</p> Signup and view all the answers

    What do distribution transformers do in the electrical distribution system?

    <p>Reduce voltage for customers</p> Signup and view all the answers

    Where are services in the electrical distribution system typically found?

    <p>Extending from substations to load areas</p> Signup and view all the answers

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