Method for judging power grid fault occurrence reason based on calculation of transition resistance

A technology for transition resistance and power grid faults, applied in the fault location, detecting faults by conductor type, measuring electricity, etc.

Pending Publication Date: 2022-05-13
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the actual operation process, because the location of the fault on the grid line is random, it is not easy to determine the location of the fault, and it is difficult to install a wave recording device at the fault to obtain a transition resistance image

Method used

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  • Method for judging power grid fault occurrence reason based on calculation of transition resistance
  • Method for judging power grid fault occurrence reason based on calculation of transition resistance
  • Method for judging power grid fault occurrence reason based on calculation of transition resistance

Examples

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Effect test

example 1

[0040] In this example, the method for judging the cause of the grid fault based on the calculation of the transition resistance includes the following steps:

[0041] S1: Obtain the transient voltage and current at both ends of the first fault line when a fault occurs, for example, obtain the wave recording data of the substation at both ends of the fault line, which records the transient voltage at both ends of the first fault line when the fault occurs current. figure 1 shows the voltage recording data u at one end of the first fault line M (t), figure 2 shows the voltage recording data u at the other end of the first fault line N (t). Based on the distributed parameter model, the transient voltage and current distribution on the fault line is calculated.

[0042] S2: Determine the search step size, and generate multiple fault points to be determined on the fault line.

[0043]S3: Based on the instantaneous phase consistency of the transient voltage and current on the...

example 2

[0048] In this example, the method for judging the cause of the grid fault based on the calculation of the transition resistance includes the following steps:

[0049] S1: Obtain the voltage recording data at both ends of the second fault line when the fault occurs, such as Figure 4 and Figure 5 shown. in, Figure 4 shows the voltage recording data at one end of the second fault line, Figure 5 The voltage recording data at the other end of the second fault line is shown.

[0050] S2: Determine the change trend of the transition resistance according to the wave recording data, Figure 6 The change trend of the transition resistance of the second fault line is shown.

[0051] S3: Determine the cause of the grid fault. If the change trend of the transition resistance is a rapid decrease in resistance, the cause of the fault is external force damage. If the change trend of the transition resistance is no obvious mutation, the cause of the fault is lightning.

[0052] S4: ...

example 3

[0056] In this example, Figure 7 It shows the transition resistance values ​​of 36 sampling points of the third fault line when the fault occurs when the frequency is 1200 Hz. ignoring Figure 7 post-judgment of spike interference in Figure 7 The change trend of the transition resistance is shown. At the 0th sampling point, the resistance value of the transition resistance is about 180Ω; at the 6th sampling point, the resistance value of the transition resistance is about 90Ω; at the 12th sampling point, the resistance value of the transition resistance is about 30Ω; at the 18th sampling point At the 24th sampling point, the transition resistance is about 20Ω; at the 30th sampling point, the transition resistance is about 15Ω; at the 36th sampling point, the transition resistance is The resistance is about 15Ω. Then, in the first 0.01s after the fault occurs, the resistance value change rate of the transition resistance is 15000Ω / s, and the drop rate is greater than 500Ω...

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Abstract

The invention provides a method for judging a power grid fault occurrence reason based on calculation of transition resistance. The method comprises the following steps: acquiring recording data at two ends of a fault line when a fault occurs, and calculating the change characteristic of transition resistance along with time; and judging the cause of the power grid fault according to the change trend of the calculated transition resistance, if the change trend of the transition resistance is that the resistance is rapidly reduced, determining that the fault cause is insulation pollution breakdown, and if the change trend of the transition resistance is initially small and has no obvious change, determining that the fault cause is lightning stroke. The method has the beneficial effects that the cause of the fault of the power transmission line of the power grid can be simply, conveniently and quickly determined, so that the fault can be quickly handled.

Description

technical field [0001] The invention relates to the field of electrical engineering, specifically, a method for judging the cause of a grid fault based on calculating transition resistance. Background technique [0002] In the short-circuit faults of power lines, metallic short-circuits only account for a relatively low proportion. Most of the current at the short-circuit point flows through the resistance of the intermediate substance and connects with the earth or other connections. The common ones are arc resistance, metal pole grounding resistance, and phase conductors. Contact resistance with the earth, resistance of other intermediate substances such as trees, etc. [0003] Arc resistance generally appears in instantaneous faults of power lines, so it is the most common. At the same time, short-circuit fault arc is an extremely complex random physical phenomenon, and it is very difficult to calculate accurately. Faults caused by different reasons, shorted by different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 陈力罗建何潜孙晓勇寇菁悦
Owner STATE GRID CORP OF CHINA
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