Fault processing method and system for overhead-cable hybrid line

A kind of fault handling method, technology of mixed line

Pending Publication Date: 2019-08-06
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the frequent transient faults of the overhead lines of hybrid lines, and the transient faults of internal lines of users are also prone to occur, if automatic reclosing is not used in this situation, the entire line will often be cut off for a long time, seriously affecting the reliability of power supply sex
On the other hand, the basis for not using reclosing switches for lines containing cables in the early stage is mainly to consider that when reclosing occurs in permanent faults, the fault current may cause cable damage and impact on the main transformer, but the current situation is very different

Method used

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  • Fault processing method and system for overhead-cable hybrid line
  • Fault processing method and system for overhead-cable hybrid line
  • Fault processing method and system for overhead-cable hybrid line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A schematic flow chart of a fault handling method for an overhead line-cable hybrid line provided by the present invention is as follows figure 1 shown, including:

[0061] When the overhead wire-cable hybrid line with the preset safety protection configuration fails,

[0062] For the anti-short-circuit current capability of the overhead line-cable hybrid line, select the strategy corresponding to the anti-short-circuit current capability of the fault line from the pre-built fault handling strategies for fault processing;

[0063] Among them, the overhead line-cable hybrid line includes: the overhead line and the cable line connected to the overhead line; the safety protection configuration is based on the short-circuit current resistance of the cable line and the main transformer connected to the overhead line-cable hybrid line; the fault handling strategy is based on The anti-short-circuit current capacity of the cable line and the main transformer should be configur...

Embodiment 2

[0071] against image 3 The overhead line-cable hybrid line shown implements the method described in this patent.

[0072] If the main transformer in substation 1 and the cables in the cable line area have strong short-circuit current resistance, then configure the current protection with three-level delay and differential coordination at the outgoing line C1, branch C2 and user (secondary branch) C5 of the substation. Troubleshooting with the cooperation of electrical protection and reclosing. Specifically: configure a circuit breaker at C1 with the functions of "three remotes", current protection and fault current reporting; configure a circuit breaker at C2 with "three remotes" functions, current protection and fault current reporting; at C5 Equipped with a circuit breaker, it has the functions of "three remotes", current protection and fault current reporting. The circuit breaker at C1 is equipped with delayed current quick-break protection and over-current protection, a...

Embodiment 3

[0076] Based on the same inventive concept, the present invention also provides a fault handling system for overhead wire-cable hybrid lines. Since the principles of these devices to solve technical problems are similar to the fault handling methods for overhead wire-cable hybrid lines, the repetitions will not be repeated. .

[0077] The basic structure of the system is as Figure 4 As shown, including: fault handling module;

[0078] Among them, the fault processing module is used to select the faulty line from the pre-built fault processing strategy for the short-circuit resistance capability of the overhead line-cable hybrid line when a fault occurs on the overhead line-cable hybrid line with the preset safety protection configuration. The strategy corresponding to the ability to withstand short-circuit current is used for troubleshooting;

[0079] Among them, the overhead line-cable hybrid line includes: the overhead line and the cable line connected to the overhead lin...

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Abstract

The invention provides a fault processing method and system for an overhead-cable hybrid line. According to the invention, when there is a fault in the overhead line-cable hybrid line with preset safety protection configuration, a strategy corresponding to the short-circuit current resistance of the faulty line is selected from pre-constructed fault processing strategies in allusion to the short-circuit current resistance of the overhead-cable hybrid line, wherein the safety protection configuration and fault processing strategies are configured based on the short-circuit current resistance ofa cable line and a main transformer. The method and system take into account of the difference of short-circuit current resistance of the main transformer and the cable line in a distribution network, carry out different safety protection configurations, effectively distinguish permanent faults and instantaneous faults by reasonably utilizing the advantages of distributed processing and centralized intelligent processing through the cooperation of relay protection and reclosing, and quickly realize the minimum range of fault isolation and the maximum range of power supply recovery.

Description

technical field [0001] The invention belongs to the technical field of security protection configuration and fault processing of distribution networks, and in particular relates to a fault processing method and security configuration of an overhead line-cable hybrid line. Background technique [0002] Overhead lines are generally used in traditional distribution networks. However, with the rapid development of power grids, laying cables can not only increase the transmission capacity of lines, reduce the scale of outgoing lines in substations, but also reduce the pressure on line channels and improve channel utilization. Simplify network wiring, therefore, the proportion of cable lines in the power grid is gradually increasing, combined with the original overhead lines, forming a phenomenon of more and more overhead line-cable hybrid lines in the distribution network. Existing studies on distribution network safety protection configuration and fault handling are mostly orien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/08H02H3/093
CPCH02H3/08H02H3/093H02H7/26
Inventor 李雅洁宋晓辉孟晓丽高菲李建芳张瑜赵珊珊常松
Owner CHINA ELECTRIC POWER RES INST
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