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Small-current earth fault switch-selecting and sectioning method for power system

A technology of small current grounding and fault line selection, applied in directions such as fault locations, to achieve the effects of large amplitude, abundant transient signals and wide application

Inactive Publication Date: 2004-12-15
SHANDONG KEHUI POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

imposes limitations on all steady-state based methods

Method used

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  • Small-current earth fault switch-selecting and sectioning method for power system
  • Small-current earth fault switch-selecting and sectioning method for power system
  • Small-current earth fault switch-selecting and sectioning method for power system

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Embodiment Construction

[0033] The present invention can respectively realize fault line selection and segmenting functions by various methods, and can be a special device with a single function, and can also share a software and hardware platform with other devices, such as a distribution network automation system and a feeder outlet protection device.

[0034] The following are respectively described:

[0035] 1. Line selection method for single-phase ground fault of power station:

[0036] Utilizing the invention can compare the fault information of each outgoing line to realize fault line selection as in the traditional method. attached Figure 6 Shown is a schematic diagram of its device structure, where the dotted line part is an optional part. Each data acquisition unit DAU is responsible for detecting different lines, and uploads the detection data to the CPU unit for centralized processing. The processing results can be displayed locally or uploaded to remote scheduling in various forms. ...

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Abstract

The related information of the transient zero sequence voltage and the transient zero sequence current caused by the fault are chosen as the reference for selecting the detective line and the subsection. The judgement is based on the components with the capacitive constraint relation in the transient zero sequence voltage and current caused by the fault. The defective line and the subsection are determined based on the reactive power and the direction in the transient signals. The invention is suitable to the system in which the neutral point is not connected to the ground, the arc-extinguishing coil is connected to the ground and the high-ohm resistor is connected to the ground. The invention possesses the features of no influence of the flash trouble and the self-determination without need of the defective information of other lines.

Description

technical field [0001] A method for line selection and segmentation of small current ground faults in power systems, relating to a method for line selection and segmentation of single-phase ground faults in medium-voltage distribution networks with ungrounded neutral points, grounded arc suppressing coils, or high-impedance grounding systems, especially involving A single-phase grounding protection method for small current grounding systems with its own characteristics. Background technique [0002] Most of my country's power distribution system adopts neutral point ungrounded or resonant grounded (arc suppression coil grounded) 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 fault li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 薛永端徐丙垠陈羽李京冯祖仁
Owner SHANDONG KEHUI POWER AUTOMATION
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