Flashover fault simulation device and simulation method for overhead lines under impulse voltage
A technology for overhead lines and impulse voltages, applied in fault locations, measuring devices, and detecting faults according to conductor types, can solve problems such as evaluation of flashover characteristics of insulation equipment, inability to be equivalent, and inability to reproduce the operation of the power grid to achieve guaranteed Effect of Flashover Fault Effectiveness
Inactive Publication Date: 2021-01-08
SICHUAN UNIV +1
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Problems solved by technology
Moreover, none of the above-mentioned fault simulation devices have simulated and studied the actual working conditions of icing flashover and tree branch flashover under the action of power frequency voltage and impulse voltage, and cannot reproduce the actual operation of the power grid. The effect of fault simulation is well equivalent to the actual situation, and it is difficult to accurately evaluate the flashover characteristics of insulating equipment (such as transmission lines, insulators, etc.) in the power grid
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Embodiment 1
[0049] The flashover fault simulation device of the overhead line under the impulse voltage provided by this embodiment, such as Figure 1 to Figure 3 As shown, it includes a power frequency voltage generation unit, an impulse voltage generation unit, a fault simulation unit 5 and a data collector 9; the power frequency voltage generation unit and the impulse voltage generation unit are used to apply power frequency voltage and impulse voltage to overhead lines, power frequency The high-voltage terminals of the voltage generating unit and the impulse voltage generating unit are respectively connected to both ends of the overhead line 4, the low-voltage terminals of the power frequency voltage generating unit and the impulse voltage generating unit are grounded, the high-voltage terminal of the fault simulation unit 5 is connected to the overhead line, and the low-voltage terminal is connected to the overhead line through The ground wire is grounded.
[0050] Such as figure 1 ...
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The invention discloses a flashover fault simulation device and simulation method for an overhead line under surge voltage. The flashover fault simulation method for an overhead line under surge voltage includes the steps: applying a power frequency voltage to the overhead line through a power frequency voltage generating unit to simulate a normal running state of the overhead line; and applying asurge voltage to the overhead line through a surge voltage generator to simulate the situation that the overhead line is subjected to lightning and the operation is overvoltage so as to reproduce theactual complex condition for operation of the overhead line, thus simulating the icing flashover or vegetation flashover fault situation of the overhead line under the double action of the power frequency voltage and the surge voltage, so that the flashover fault simulation method for an overhead line under surge voltage not only can provide basic data for flashover fault judgment, but also can accurately evaluate the flashover performance of power equipment, such as the overhead line and an insulator so as to provide reliable guarantee for normal running of the power line provides a reliableguarantee.
Description
technical field [0001] The invention belongs to the technical field of fault simulation in electric power engineering, relates to a fault simulation technology for vegetation flashover and icing flashover, in particular to a flashover (including vegetation flashover and icing flashover) of an overhead line under impulse voltage ) fault simulation device and simulation method. Background technique [0002] my country has a vast territory and power lines are widely distributed. It is very common for overhead lines to be surrounded by vegetation and insulators to be covered by ice and snow. The resulting vegetation flashover and ice flashover are also common line faults in this field. The common lightning and operating overvoltage also have a great impact on the transmission line, and it is easy to generate impulse voltage; under the impulse voltage, vegetation flashover and icing flashover are more likely to occur, resulting in short circuit of the line, interruption of power ...
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IPC IPC(8): G01R31/12G01R31/08
CPCG01R31/085G01R31/1272
Inventor 龚薇何珉周凯
Owner SICHUAN UNIV