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Method for faulty orientation and subsection of power system low current grounding

A low-current grounding, power system technology, applied in fault locations, electrical components, emergency protection circuit devices, etc., to achieve the effect of wide application, easy detection, and abundant transient signals

Inactive Publication Date: 2008-06-18
SHANDONG KEHUI POWER AUTOMATION
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Problems solved by technology

imposes limitations on all steady-state based methods

Method used

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  • Method for faulty orientation and subsection of power system low current grounding
  • Method for faulty orientation and subsection of power system low current grounding
  • Method for faulty orientation and subsection of power system low current grounding

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Embodiment Construction

[0035] The whole system to realize the segmentation function consists of three parts: terminal equipment distributed on each detection point of the line, central processing unit and communication system located in the substation. The terminal equipment is responsible for real-time monitoring of the change of the zero-sequence current of the line, extracting the zero-sequence current signal of the adjacent detection point after a fault occurs, and calculating its maximum correlation coefficient ρ M . After receiving the information reported by each terminal device, the central processing unit determines the faulty section and sends out an alarm signal. Then manually or automatically remote control the corresponding switch to isolate the fault and restore the power supply of the healthy line.

[0036] Attached below Figure 1-3 Further explain the structure and working process of the system.

[0037] figure 1 Shown: It is a typical system structure. The whole detection syst...

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Abstract

A sectionalizing and location method of the small current grounding fault of the power system relates to the detecting field of the grounding fault of the power system. The invention is characterized in that the maximum correlation coefficient of two transient zero sequence current signals after filtration is calculated, the related information of the transient zero sequence current between two neighboring detecting points caused by faults is utilized as the basis of the fault sectionalizing and the voltage transformer does not need to be assembled, the fault section is determined according to the maximum correlation coefficient of the transient zero sequence current of the neighboring detecting points. The method has the advantages of the higher amplitude of the transient signal than that of the stationary signal and easy detection, no influence from the grounding mode of the neutral points of the system, occurrence of the transient process during each breakdown of the insulation at the flashing failure and more rich transient signal and wide application, only need of the current signal, and no need of the voltage transformer on the detecting points.

Description

technical field [0001] The invention belongs to the field of detection and processing of grounding faults in power systems. In particular, it relates to a segmental positioning method for a single-phase grounding fault of a medium-voltage distribution network in a neutral point ungrounded, grounded through an arc suppressing coil, or a high-resistance grounded system. Background technique [0002] Most of the power distribution systems in my country adopt the neutral point ungrounded or resonant grounded (grounded through the arc suppression coil) treatment. Due to the small fault current and the unstable grounding process caused by arc light, single-phase ground fault detection has been difficult to solve completely. [0003] In the neutral point ungrounded power grid, when the single phase is grounded, the power frequency zero-sequence current of the faulty line is equal to the sum of the capacitive currents of all healthy lines to the ground, and the direction is from th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H7/26
Inventor 徐丙垠薛永端许立强孙波马士聪
Owner SHANDONG KEHUI POWER AUTOMATION
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