electrical construction (ENG)

The mobile transformer method in Korea is used when a pole-mounted transformer is replaced or relocated, or the supply arrangement changes: a mobile transformer (vehicle-mounted) supplies low-voltage customers temporarily while the existing transformer is replaced dead. Customers are carried by the mobile unit and workers handle a dead transformer, so connecting the mobile unit and … 더 읽기

The bypass cable method in Korea connects the source and load sides of the work section with a bypass cable to keep power flowing, then separates the work section’s jumpers by live-line work so the section can be worked dead. Unlike the temporary switch method, customers inside the work section stay supplied, which makes the … 더 읽기

The temporary switch method in Korea applies when there is no load within the work section and an outage of that section is acceptable: a temporary switch is installed on the load side so only the work section is made dead, and the work proceeds without a wider outage. Switching and jumper cutting and reconnection … 더 읽기

The mechanized space expansion method in Korea installs a lift drive unit on an energized high-voltage distribution line to move the existing conductors aside, creating working space for tasks such as pole replacement and pole-top changes without an outage. Because conductors are spread by machine rather than by hand, how firmly the unit is installed … 더 읽기

Non-contact indirect live-line work in Korea lets a live-line crew work on energized high-voltage lines and equipment using smart sticks and other indirect tools, so no part of the worker touches live parts: cutting and compressing conductors, replacing cut-out switches (COS), connecting drop leads and replacing faulty suspension insulators. Working without an outage means skipping … 더 읽기

Transmission line completion inspection in Korea covers the testing, pre-use inspection, charging and energization, and completion inspection needed to close out a transmission project. Transmission lines center on towers and long spans, so visual items such as sag, ground clearance, span length and tower assembly and painting make up much of the inspection, and communication … 더 읽기

Underground transmission cable laying preparation in Korea covers everything done before cables go into ducts and tunnels: material inspection, safety, cable work preparation, tunnel preparation, duct continuity tests and, for HVDC projects, submarine cable route surveys. Whether pulling day succeeds is largely decided by section-by-section tension calculations, the cable transport plan and route surveys. This … 더 읽기

Underground transmission cable laying in Korea covers installing ducts, testing their continuity and pulling underground transmission cables into ducts and tunnels; on HVDC projects it also includes laying submarine cables. Missing the bending radius, entry speed or tension limit during pulling damages insulation, and inadequate allowance for thermal movement in tunnels causes problems in service. … 더 읽기

Transmission cable construction in Korea covers underground structures, duct continuity tests, cable pulling, jointing and line earthing to install transmission cables in ducts and tunnels. The stages share names with distribution cable work, but 154 kV and 345 kV cables are heavy and large, making transport limits, pulling tension and joint sealing far more demanding. … 더 읽기

Distribution line completion inspection in Korea covers the testing, pre-use inspection, charging and energization, and completion inspection needed to close out a distribution project. Distribution lines run close to roads and buildings, so conductor height and sag, clearances to structures and trees, and circuit checks on underground switches are at the center of inspection. This … 더 읽기