A post-measurement simulation identification method for internal and external faults of double-circuit transmission lines on the same pole based on lumped parameter t-model

A technology of centralized parameters and transmission lines, which is applied in the direction of fault location, measuring electricity, measuring devices, etc., can solve the problems of long data window, difficult capture of traveling wave signal, non-repeatable limitation, etc.

Active Publication Date: 2015-12-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the protections widely used in double-circuit lines on the same pole include the inside and outside protection based on the power frequency quantity and the traveling wave head. However, in order to obtain the required power frequency component, the inside and outside protection based on the power frequency quantity still needs a filtering algorithm. Naturally, a very long data window is required; the difficulty of capturing and non-repeatability of traveling wave signals based on traveling wave head protection inside and outside the zone limits the reliability of traveling wave protection

Method used

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  • A post-measurement simulation identification method for internal and external faults of double-circuit transmission lines on the same pole based on lumped parameter t-model
  • A post-measurement simulation identification method for internal and external faults of double-circuit transmission lines on the same pole based on lumped parameter t-model
  • A post-measurement simulation identification method for internal and external faults of double-circuit transmission lines on the same pole based on lumped parameter t-model

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: This method is applied to 500kV AC double-circuit transmission lines on the same pole (transmission system structure such as figure 1 As shown), the frequency-variable line model is adopted, and the total length of the line is 300km. After the phase model transformation, the same-vector α-mode network of double-loop lines on the same pole is as follows figure 2 shown.

[0052] A single-phase ground fault occurs 100km away from terminal M in the positive direction (such as figure 1 middle k 1 point), the transition resistance is 100Ω.

[0053] When a fault occurs on the double-circuit transmission line on the same pole, within a short time window, the actual measurement of the same vector of points M and N at the first and last ends of the transmission line α Modulus voltage u M , u N and current i M , i N , and then analyze the network characteristics of the same vector α modulus inside and outside the same-pole double-circuit transmission li...

Embodiment 2

[0059] Embodiment 2: This method is applied to 500kV AC double-circuit transmission lines on the same pole (transmission system structure such as figure 1 As shown), the frequency-variable line model is adopted, and the total length of the line is 300km. After the phase modulus transformation, the double loops on the same pole have the same vector α Model network such as figure 2 shown.

[0060] An IAG fault occurs 200km away from the M terminal in the double-circuit line area on the same pole (such as figure 1 middle k 2 point), the transition resistance is 100Ω.

[0061] The sampling frequency is 20kHz, the short time window is 2ms, and the data length is measured N 1 =40. According to the same method as in Example 1, the actual measurement of the same vectors of M and N at both ends of the double-circuit transmission line on the same pole α Modulus voltage u M 、u N and current i M 、i N , by the equation , and the simulation calculation obtains the N-side...

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Abstract

The invention relates to a simulation-after-test identification method for internal and external faults of a same-pole double-circuit power transmission line based on a lumped parameter T model, belonging to the technical field of relay protection of electric systems. The simulation-after-test identification method comprises the steps of: when a fault is produced on the same-pole double-circuit power transmission line, in a short time window, actually measuring same-vector alpha mode voltages mu M and mu N and currents iM and iN on the points M and N at the head and tail ends of the power transmission line; then analyzing the properties of internal and external same-vector alpha mode networks of the same-pole double-circuit power transmission line, listing out an equation by a Kirchhoff current principle of the lumped parameter T model, and calculating the current at the side N of the tail end of the power transmission line by equation simulation; and then calculating a related coefficient r of a simulated current waveform and an actually measured current waveform at the side N of the tail end, and identifying the internal and external faults of the same-pole double-circuit power transmission line according to the related coefficient r. According to the simulation-after-test identification method, the internal and external faults are identified by a simulation-after-test time domain algorithm; and the simulation-after-test identification method has the advantages of quick and accurate identification of the internal and external faults, no influence from transition resistors, high sensitivity, good reliability and the like.

Description

technical field [0001] The invention relates to a post-measurement simulation identification method for internal and external faults of double-circuit transmission lines on the same pole based on a concentrated parameter T model, and belongs to the technical field of electric power system relay protection. Background technique [0002] At present, the protections widely used in double-circuit lines on the same pole include the inside and outside protection based on the power frequency quantity and the traveling wave head. However, in order to obtain the required power frequency component, the inside and outside protection based on the power frequency quantity still needs a filtering algorithm. Naturally, a very long data window is required; the difficulty of capturing and non-repeatability of traveling wave signals based on traveling wave head protection inside and outside the zone limits the reliability of traveling wave protection. Because the model-based time-domain prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08
Inventor 束洪春梁琴琴董俊邬乾晋
Owner KUNMING UNIV OF SCI & TECH
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