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A fault identification method for direct lightning strikes on transmission lines based on phase distinction and s-transformation

A transmission line and fault identification technology, which is applied to detect faults and fault locations according to conductor types, and can solve problems such as differences in characteristic parameters of feature extraction methods

Active Publication Date: 2020-02-07
国网重庆市电力公司万州供电分公司 +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the lightning current online monitoring system, the installation position of the sensor and the monitoring method are different, resulting in different transient current waveforms, and the current waveform is affected by the impact corona effect differently under different propagation distances. The feature quantity extraction methods and their feature parameters are different

Method used

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  • A fault identification method for direct lightning strikes on transmission lines based on phase distinction and s-transformation
  • A fault identification method for direct lightning strikes on transmission lines based on phase distinction and s-transformation
  • A fault identification method for direct lightning strikes on transmission lines based on phase distinction and s-transformation

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Effect test

Embodiment 1

[0088] see figure 1 , image 3 with Figure 4 , a power transmission based on phase distinction and S-transform theory

[0089] The line direct lightning strike fault identification model mainly includes the following steps:

[0090] 1) The three-phase transmission lines are respectively recorded as A-phase transmission lines, B-phase transmission lines and C-phase transmission lines. The direct lightning strike faults of three-phase transmission lines are divided into one-phase faults, two-phase faults and three-phase faults.

[0091] Further, a one-phase fault means that only one phase of the transmission line fails in the event of a lightning strike. The two-phase fault refers to the failure of two-phase transmission lines in the case of lightning strikes. Three-phase fault means that in the case of lightning strike, all three-phase transmission lines fail.

[0092] 2) Different electrical parameters and fault generation conditions are set in the EMTP-ATP simulation s...

Embodiment 2

[0157] see figure 2 A method for identifying a direct lightning strike fault on a transmission line using the transmission line direct lightning strike fault identification model based on phase distinction and S-transform theory mainly includes the following steps:

[0158] 1) A differential ring sensor is respectively installed on the pole tower at the upper end of the insulator of the three-phase transmission line. The three-phase transmission lines are respectively A-phase transmission lines, B-phase transmission lines and C-phase transmission lines. The differential ring sensors are respectively used to monitor the lightning current signals of A, B and C three-phase transmission lines.

[0159] II) The measured lightning current signal is recorded and stored through a multi-channel synchronous high-speed acquisition card. The multi-channel synchronous high-speed acquisition card records 0-t after the transmission line triggers a lightning strike 0 A, B, and C three-pha...

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Abstract

The invention provides a power transmission line direct lightning fault identification method based on a phase type distinguishing and S conversion theory. The method comprises the following steps of1) through a differential ring sensor, acquiring the lightning current signal waveform of a three-phase line; 2) calculating three-phase current energy and extracting characteristic quantities T1 andT2; 3) through the characteristic quantities T1 and T2, carrying out preliminary classification on a direct lightning fault; 4) carrying out S conversion on a time-domain lightning current waveform and extracting characteristic quantities T3 and T4; and 5) through the characteristic quantities T3 and T4, carrying out further classification on the direct lightning fault and determining a fault type. According to the lightning current, the direct lightning fault type of a power transmission line can be accurately identified.

Description

technical field [0001] The invention relates to the field of fault monitoring and identification of power systems, in particular to a fault identification method for direct lightning strikes on transmission lines based on phase distinction and S transformation. Background technique [0002] The lightning monitoring signal can be obtained directly by collecting the measured signal of the actual online monitoring system, or by using the simulation model to simulate different types of direct lightning strike faults. According to the performance or characteristic information contained in the measured signal, the identification of the fault type can be realized, and the staff in the electric power department can be helped to formulate corresponding emergency repair measures, which belongs to a technical application in the field of online monitoring. [0003] At present, in the power system, although scholars at home and abroad have carried out a lot of research work on the fault ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 陈莉波王剑飞何志满蒋新川张聪誉王秦谢春林万晖米彦姚陈果李成祥
Owner 国网重庆市电力公司万州供电分公司
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