A method for on-line insulation monitoring and line selection of resonant grounding system
A line selection method and resonant grounding technology, applied in information technology support systems, testing dielectric strength, fault location, etc., can solve the problems of small active component of grounding current and reduced accuracy, and achieve high accuracy, simple implementation, and improved The effect of sensitivity
Inactive Publication Date: 2017-08-11
刘宝稳
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Problems solved by technology
The active component of the ground current is relatively small, which greatly depends on the accuracy of the measuring equipment, especially when the power grid is grounded with high resistance. The ground current is even smaller. The accuracy of this method will also be greatly reduced.
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[0027] In order to make the technical means, creative features, technical solutions, advantages and effects of the present invention more clear, the detailed implementation and specific operation process are given below in conjunction with the drawings in the embodiments of the present invention. figure 1 It is the equivalent schematic diagram of a single-phase grounding fault in a resonant grounding system. The power grid has n feeders, and the i-th G E The ground fault of the grid, the neutral point of the grid is grounded through the arc suppression coil, as shown in the figure L is the equivalent inductance of the arc suppression coil, G L is the equivalent parallel conductance, for the adjustable arc suppressing coil G L =0, remember that the parameters of the power grid line to ground are asymmetrical. The implementation of the present invention can directly obtain the grid bus zero-sequence voltage signal from the secondary side of the PT, and obtain the feeder zer...
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The invention discloses an online insulation monitoring and line selecting method for a resonant grounded system. By means of the method, insulation parameters of all feeder lines can be precisely measured online, and the sensitivity of judging single-phase earth faults is improved; when a power grid has the single-phase earth faults, fault lines are found out through changes of the insulation parameters of the feeder lines; under a full-compensation state of an arc suppression coil, whether the faults are eliminated can be judged by monitoring the insulation parameters of the feeder lines. The method eliminates the influence of the asymmetry degree of parameters of the power grid on measurement of the insulation parameters of the feeder lines, eliminates the influence of transition resistance on fault phase selection, eliminates the influence of resonance overvoltage of the arc suppression coil on the judgment of whether the faults are automatically eliminated, and solves the technical problems of power grid insulation monitoring, fault line selection, fault recovery judgment and the like. The realizing mode is simple, precision is high, and normal operation of the system is not affected.
Description
technical field [0001] The invention relates to a measurement and control method of electrical technology, in particular to a technique for measuring insulation parameters of a feeder line in a resonant grounding system and identifying a faulty line. Background technique [0002] Because the arc suppressing coil can generate inductive current, it can greatly reduce the capacitive current of the ground fault, and has the effect of extinguishing the ground arc. Reliability of distribution network operation. In order to improve the compensation accuracy of the capacitive current, the arc suppression coil needs to measure the insulation parameters of the power grid in real time to meet the requirements of tracking compensation. However, the arc suppression coil can only measure the total capacitance of the grid line and the total conductance of the insulation, and can do nothing for the insulation parameters of the feeder. [0003] When the resonant grounding system is in norm...
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IPC IPC(8): G01R31/08G01R31/12
CPCY04S10/52
Inventor 刘宝稳高慧会
Owner 刘宝稳