Low-current ground fault line selection device

A technology of small current grounding and fault line selection, applied in the electrical field, can solve the problems of low sensitivity and accuracy, and achieve the effect of an excellent human-computer interaction interface

Inactive Publication Date: 2013-12-11
江苏广识电气有限公司
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Problems solved by technology

A single fault branch line selection method based on a certain parameter has its own shortcomings, and due to the limitations of line selection theory and technology, the sensitivity and accuracy of the device are not high.

Method used

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  • Low-current ground fault line selection device
  • Low-current ground fault line selection device

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Embodiment Construction

[0008] The small current grounding fault line selection device of the present invention mainly adopts comprehensive line selection and continuous line selection technology, wherein the ungrounded system mainly adopts the phase method, and the grounded system uses the active power, fifth harmonic, and transient comprehensive analysis method, through A variety of line selection algorithms define the effective domain, and effectively integrate multiple algorithms to ensure the accuracy of line selection. In order to avoid misselection caused by the interference of the fault signal, the device also adopts a continuous line selection method, and re-collects data for analysis at regular intervals. As long as the fault does not disappear, the line selection calculation of the device will not stop.

[0009] Such as figure 1 As shown, after the zero-sequence voltage signal 1 of the busbar and the zero-sequence voltage signal 2 of each line pass through the PT / CT transformer 3 and the ...

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Abstract

Provided is a low-current ground fault line selection device. Active domains of various line selection methods are determined through the rough set theory, the line selection methods comprise the group amplitude comparison and phase comparison method, the harmonic amplitude comparison and phase comparison method, the wavelet method, the first half-wave method, the active component method, the energy method and the like, reliability quantitative evaluation is conducted on the fault line selection result obtained in each line selection method according to fault signal characteristics, all the line selection methods are integrated by applying the evidence theory, and advantage complementation among all the line selection methods is guaranteed to the maximum. In order to prevent fault signals from being interfered to cause mistaken selection, the device utilizes the continuous line selection method, data are recollected to be analyzed at intervals of a certain time, and line selection calculation of the device will not stop as long as faults do not disappear.

Description

technical field [0001] The invention relates to a wire selection device, in particular to a small current grounding fault wire selection device, which belongs to the field of electrical technology. Background technique [0002] The power supply systems of most distribution networks and large-scale industrial and mining enterprises in my country belong to the small current grounding system (that is, the neutral point is not grounded system, the neutral point is grounded through the arc suppression coil and the neutral point is grounded through the resistance system), and Most of them use the neutral point ungrounded system and the neutral point is grounded through the arc suppression coil. The advantage of the small current grounding system is that the single-phase grounding current is small, and the single-phase grounding does not form a short-circuit loop, and the power system safety regulations stipulate that it can continue to run for 1 to 2 hours. However, long-term grou...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 袁朋生孟献仪王浩先
Owner 江苏广识电气有限公司
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