Adaptive reclosing method based on travelling wave segmentation principle for mixed line

A hybrid line, reclosing technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc. Determine the fault point, line section and other problems, achieve the effect of broad application prospects, improve power supply reliability and system operation stability

Inactive Publication Date: 2011-07-13
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the overhead line-cable hybrid line, the conventional reclosing method cannot pre-judge the line section where the fault point is located, so the reclosing action behavior is not selective
For this reason, the recloser had to be deactivated in many places, which obviously greatly reduced the power supply reliability of the hybrid line

Method used

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  • Adaptive reclosing method based on travelling wave segmentation principle for mixed line
  • Adaptive reclosing method based on travelling wave segmentation principle for mixed line
  • Adaptive reclosing method based on travelling wave segmentation principle for mixed line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Use M and N to represent the two ends of the hybrid line, use P to represent the connection point between the cable and the overhead line, the MP segment to be the cable, the NP segment to be the overhead line, and F to represent the fault point. Cable section length L C =21.7km, length L of overhead lines O = 30km, the propagation speed v of the transient traveling wave in the cable C =171.99km / ms, the propagation speed v of transient traveling wave in the overhead line O = 293.91 km / ms. use t M and t N Respectively represent the absolute time when the initial traveling wave surge of the line fault reaches the M-terminal and N-terminal buses, ΔL represents the distance measurement margin, and ΔL=0.5km. Assuming that the hybrid line MN fails at time t=0, the fault point F is located in the cable section, and the distance from it to the M end is 10km.

[0016] Use the first method to achieve:

[0017] Step 1. Calculation

[0018] Step 2, measure...

Embodiment 2

[0026] Embodiment 2: use M and N to represent the two ends of the hybrid line, use P to represent the connection point between the cable and the overhead line, the MP segment to be the cable, the NP segment to be the overhead line, and F to represent the fault point. Cable section length L C =21.7km, length L of overhead lines O = 30km, the propagation speed v of the transient traveling wave in the cable C =171.99km / ms, the propagation speed v of transient traveling wave in the overhead line O = 293.91 km / ms. use t M and t N Respectively represent the absolute time when the initial traveling wave surge of the line fault reaches the M-terminal and N-terminal buses, ΔL represents the distance measurement margin, and ΔL=0.5km. Assuming that the hybrid line MN fails at time t=0, the fault point F is located in the overhead line section, and the distance from it to the N terminal is 22.6km.

[0027] Use the first method to achieve:

[0028] Step 1. Calculation

[0029] ...

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Abstract

The invention provides an adaptive reclosing method based on travelling wave segmentation principle for a mixed line. The method comprises the following steps: (1) using M and N to represent the two ends of the mixed line, using tM and tN to respectively represent the absolute time at which the initial travelling wave surge of the line fault reaches the M-end bus and the N-end bus, computing the difference deltaTp of the time at which the travelling wave of the fault reaches the two ends of the line when the P point has fault and using the difference deltaTp as the reference value, wherein the M end is the cable end and P is the joint of a cable and an overhead line; (2) computing the difference deltat of tM and tN when the line has fault; (3) judging the fault section according to whether deltat is greater than deltaTp or not; and (4) when the fault point is in the overhead line section, a line protection device starts reclosing after the line fault is eliminated, or the line protection device closes reclosing. The method has the beneficial effects of realizing adaptive reclosing of the mixed line and improving the power supply reliability and has broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of power system protection, in particular to an adaptive reclosing method for hybrid lines based on the principle of traveling wave segmentation. Background technique [0002] With the development of modern urban construction, the city's electricity load continues to increase, and the existing overhead lines can no longer meet the needs of urban development, and the criss-cross overhead lines also affect the overall image of the city. Therefore, replacing the original overhead line power supply with cable network power supply has become an inevitable trend in the development of urban power grids. With the continuous transformation and upgrading of the urban power grid, the urban cable network is gradually developing to a voltage level of 110kV and above. Because the investment cost of high-voltage cables is quite high, most of the paths that can use overhead lines generally do not use simple cable power sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
Inventor 陈平
Owner SHANDONG UNIV OF TECH
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