69 kV Capacitor Bank EPC Solution for NGCP’s Visayas Grid

Samar and Leyte in the eastern Visayas include load-end areas supplied through long-distance 69 kV transmission lines, contributing to low-voltage conditions and load curtailment risks. To strengthen local voltage support, NGCP planned 5 MVAR, 69 kV capacitor banks at the Bobolosan, Tolosa, and Himayangan substations, together with associated circuit breakers and grid connection works. Sieyuan Electric was awarded the EPC contract for the three installations.

• Accelerated project schedule — The priority site required a significantly shortened execution window, placing tight constraints on design, manufacturing, logistics, construction, and commissioning.
• First use of a prefabricated modular solution — The project represented NGCP’s first use of a prefabricated modular solution for this type of capacitor bank station. Design clarification, technical reviews, and drawing approvals therefore had to progress within a compressed timeframe.
• Integration with an operating grid — The new capacitor banks had to be connected to existing 69 kV lines while meeting requirements for protection, safety, and grid acceptance, with minimal disruption to network operations.
• Multi-site EPC execution — The three sites were executed in parallel, involving manufacturing in China, international transportation, local construction, and commissioning across multiple project interfaces.

• Factory-integrated modular solution — Protection, control, and auxiliary systems were integrated into prefabricated modules, with factory testing and pre-acceptance completed before shipment. This reduced on-site installation and wiring work and supported faster deployment.
• Integrated EPC execution — Sieyuan coordinated engineering, procurement, manufacturing, logistics, civil interfaces, installation, commissioning, and energization through an integrated project execution plan.
• Parallel execution and technical coordination — Milestones were aligned with the required energization dates, while a structured technical issue register and approval process supported timely resolution of design and interface requirements.
• Controlled testing and energization — System inspection, secondary-circuit verification, protection testing, integrated commissioning, and phased energization supported safe integration with the existing grid.

• 15 MVAR of reactive compensation — Three 69 kV capacitor bank stations provide a total reactive compensation capacity of 15 MVAR, strengthening voltage support across the Samar and Leyte networks.
• Short delivery lead time — The priority Bobolosan station was completed and energized within six months, supporting the project’s accelerated implementation schedule.
• Reduced on-site work — Factory integration and pre-shipment testing reduced site installation and wiring requirements, while parallel execution supported efficient deployment across multiple locations.