Design of Dielectric Detector for FRP Hot Stick in EHV Live line Maintenance
01 Jun 2005-pp 2063-2066
TL;DR: In this paper, an approach to detect the dielectric condition of FRP Hot Stick in EHV high voltage cable whereas shutting down the power system is not necessary is presented.
Abstract: This paper presents an approach to detect the dielectric condition of FRP Hot Stick in EHV high voltage cable whereas shutting down the power system is not necessary. The radio frequency generating method is adopted by transmitting radio wave into the Electrodes. This instrument is small, easy to use and also inexpensive. Furthermore, the impurity level of dirt on high voltage insulator (non-ceramic type) will be analyzed by using the methods based on IEEE Std.978-1984 at 105 kV.DC. /305 mm. and OSHA Regulation 1910.269 Part J - live line tools. The frequency at 10-20 MHz is applied to FRP Hot Stick via Electrode1 and from FRP Hot Stick surface to Electrode 2. After that the results will be evaluated by testing in each condition of FRP Hot Stick, such as dry surface, hot surface, foil winding and conductor inserting. Finally, the watt loss will be examined and compared with the loss from humidity and Carbon tracking. The important components of this system are radio frequency generating unit, frequency stabilizing unit, frequency amplifier, FRP Hot Stick frequency counter, processing unit, and display unit.
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TL;DR: In this paper, the authors describe the live line work which was being done, the weather and the condition of the hot stick, and a series of tests were made to investigate factors which may have contributed to the flashover.
Abstract: In October 1997 Manitoba Hydro experienced the flashover of a FRP hot stick during live line work at 500 kV AC. The paper describes the live line work which was being done, the weather and the condition of the hot stick. A series of tests were made to investigate factors which may have contributed to the flashover. The adequacy of available tests for FRP hot sticks is discussed. The corrective measures which have been taken prior to resuming work of this type are described.
23 citations
24 Nov 2003
TL;DR: In this paper, a FRP hot stick was found to flash over during live line work at 550 kVac in 2002 and a second flashover occurred during live-line work at 650 kVAC in 2002, both occurred during work from the tower on "v" suspension insulators.
Abstract: In 1997 a FRP hot stick flashed over during live line work at 550 kVac. A rigorous maintenance program was instituted and all FRP hot sticks used in live line work must now withstand an annual dielectric test at 105 kVdc per 305 mm with the surface wet consistent with IEEE Std 978. More frequent electrical tests are made using a hand held tester and limits have been set for the hydrophobicity of the surface. In spite of these measures a second flashover a FRP hot stick occurred during live line work at 550 kVac in 2002. Both flashovers occurred during work from the tower on "v" suspension insulators, the first at a temperature near the freezing point and the second at a temperature well below freezing. In both cases the wind was blowing from the conductor to the worker. Our investigation is trying to establish an adequate explanation for these events as well as corrective measures. The work to date is summarized in this paper. Industry standards for limits of approach are based on the switching surge withstand of air gaps and should not be equated to the minimum safe leakage distance of FRP hot sticks.
16 citations
01 Jun 2005
TL;DR: In this article, a derivative state constrained optimal H2 integral servo problem for linear crane model systems via the constraints of the derivatives of state variables added to the standard constraints is studied.
Abstract: Study in this paper concerns the optimal H2 integral servo problems for linear crane model systems via the constraints of the derivatives of state variables added to the standard constraints. It is shown in the paper that the derivative state constrained optimal H2 integral servo problems can be reduced to the standard optimal H2 control problem. The main subject of the paper is to apply the results of derivative state constrained H2 integral servo theorem in crane system. The effect of our proposed controller with respect to mitigate an under damping for crane model system is also verified.
10 citations