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Underground Electric Transmission Lines Ground...· PDF fileThe high-pressure, gas-filled (HPGF) pipe-type of underground transmission line (see Figure 1) is a variation of the HPFF pipe-type, described above. Instead of a dielectric oil, pressurized nitrogen gas is used to insulate the conductors. Nitrogen gas is less effective than dielectric fluids at suppressing electrical discharges and cooling.

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