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Fault line selection device for distribution line of small-current grounding system

A technology of small current grounding and fault line selection, applied in emergency protection circuit devices, measuring devices, measuring electricity and other directions, can solve problems such as the inability to meet the requirements of digital substations

Active Publication Date: 2010-06-02
北京衡天北斗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing devices can meet the application requirements of traditional substations. However, with the development of substation technology and the emergence and promotion of digital substations, the communication in substa

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  • Fault line selection device for distribution line of small-current grounding system
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  • Fault line selection device for distribution line of small-current grounding system

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] figure 1 A block diagram of a distribution line fault line selection device according to an embodiment of the present invention is shown.

[0036] The distribution line fault line selection device 100 for the small current grounding system distribution line includes a converter 102 , a data collector 104 , a central processing unit 106 and a communication interface device 108 . The converter 102 is connected with the zero-sequence current transformer 1022 , converts the large current from the zero-sequence current transformer 1022 into an analog voltage signal, and outputs the analog voltage signal to the data collector 104 . The data collector 104 is used to convert the analog voltage signal from the converter into a digital voltage signal, store it in a data memory, and output it to the central processing unit 106 after a fault occurs. The central processi...

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Abstract

The invention provides a fault line selection device for a distribution line of a small-current grounding system. The fault line selection device comprises a converter, a data collector, a central processing unit and a communication interface device, wherein the converter is connected with a zero-sequence current transformer and used for converting large current from the zero-sequence current transformer into analog voltage signals having predetermined values and outputting the analog voltage signals to the data collector; the data collector is used for converting the analog voltage signals from the converter into digital signals, storing the digital signals in a data memory and outputting the digital signals to the central processing unit after a fault occurs; the central processing unit is used for processing the digital signals from the data collector, judging the fault line and outputting judgment results to the communication interface device; and the communication interface device is used for outputting the judgment results.

Description

technical field [0001] The invention relates to the technical field of power system fault line selection, in particular to a fault line selection device for power distribution lines of a small current grounding system. Background technique [0002] Single-phase ground fault detection in small current system has always been a difficult problem in the theory and technology of power system relay protection. When a single-phase ground fault occurs in a small current system, the power frequency fault current is the leakage current of the circuit to ground capacitance, the current value is small, and the fault characteristics are not obvious. Moreover, when the small current system is in normal operation, the unbalanced current is relatively large. Therefore, the existing fault line selection method based on power frequency current is difficult to accurately distinguish between fault current and unbalanced current, and cannot correctly select the line. But on the one hand, the s...

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Application Information

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IPC IPC(8): H02H7/26G01R31/02
Inventor 齐天来刘崇静
Owner 北京衡天北斗科技有限公司