Failure analysis of extra-high voltage (EHV) hot sticks

Booker, J. R.

doi:10.1109/elinsl.2004.1380692

Cited by 2 publications

(1 citation statement)

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“…978-1994, SaskPower experienced two flashovers of "clean" FRP hot sticks during cold weather live-line work under steady-state 230kVac system conditions in February and December 2012 and in common with SaskPower, Manitoba Hydro experienced two separate live-line tool flashover events in 1997 and 2002 at 500 kVac. These four incidents led to a series of tests at IREQ, Kinectrics and UQAC to investigate factors that may have contributed to the flashovers [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional FEM electrical field calculation for FRP hot stick during EHV live-line work

Ghassemi

Farzaneh

Chisholm

2014

IEEE Trans. Dielect. Electr. Insul.

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In February and December 2012, SaskPower experienced two flashovers of "clean" Fiberglass-Reinforced Plastic (FRP) hot stick during cold weather live-line work under steady-state 230 kV ac system conditions. As for SaskPower, Manitoba Hydro had two separate live-line tool flashover events, in 1997 and 2002. Clean-fog tests and nonuniform wetting tests at Hydro-Quebec Research Institute (IREQ), and cold-fog tests at Kinectrics and UQAC were carried out to explain these flashovers. The laboratory tests demonstrated that inadvertent contamination of clean tools at a very light level ( ) of Equivalent Salt Deposit Density (ESDD) likely reduced voltage withstand capability of FRP hot sticks, particularly under freezing conditions. The flashover mechanism was identified when surfaces become fully wetted by the environment or surrounding fog. However, the source of moisture in field flashovers well below 0°C, i.e. as low as -19°C, was not identified. This study is based on laboratory tests and on using available pollution flashover models to explain the results. In this paper, the main objective is to determine the potential and electric field distribution along a FRP hot stick under dry condition and non-uniform wetting. A commercial software, COMSOL Multiphysics TM , based on the finite element method (FEM), was used for the three-dimensional modeling and simulations. The results obtained will be useful to improve knowledge on the determination of discharge initiation conditions based on electric field distributions along a FRP hot stick.Index Terms -Electrical field calculation, FRP hot stick, live-line work, flashover, freezing condition.

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