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Urban power cable double-end fault ranging method based on VMD-Hilbert transformation

A technology for power cable and fault distance measurement, which is applied in the direction of fault location, measuring electricity, and measuring devices, can solve the problems of difficult determination of wave velocity, difficult prediction of zero-mode propagation characteristics, and large distance measurement error, so as to avoid distance measurement error, Effects of Good Engineering Practice Value

Inactive Publication Date: 2019-01-11
JIANGSU ELECTRIC POWER CO +1
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Problems solved by technology

[0003] At present, traveling wave ranging is widely used on overhead lines, but in power cables, the wave velocity is difficult to determine, and the zero-mode propagation characteristics are difficult to predict
If the signal analysis method and ranging formula of traditional traveling wave ranging are directly used in urban cables, the ranging error will be large

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  • Urban power cable double-end fault ranging method based on VMD-Hilbert transformation
  • Urban power cable double-end fault ranging method based on VMD-Hilbert transformation
  • Urban power cable double-end fault ranging method based on VMD-Hilbert transformation

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Embodiment Construction

[0021] Embodiments of the present invention will be given below in conjunction with the accompanying drawings, and the technical solutions of the present invention will be further clearly and completely described through the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them.

[0022] Such as figure 2 Shown, a kind of urban cable double-ended fault location method based on VMD-Hilbert transformation, comprises the following steps:

[0023] (1) Point M at the head end and point N at the end represent the measurement points at the first and last ends of the cable, and point F represents the fault point; after a fault occurs in the power cable line, the original current traveling wave signals at the point M at the head end and the point N at the end are respectively extracted , and then perform phase-mode transformation on it to obtain the original line-mode current fault traveling wave signal, denot...

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Abstract

The invention discloses a urban power cable double-end fault ranging method based on VMD-Hilbert transformation. The fault ranging method comprises the following steps: detecting an initial wave headof a fault traveling wave line mode through synchronous measuring devices arranged on both ends of a power cable; demarcating a wave head arrival moment by using a time-frequency diagram obtained by the VMD-Hilbert transformation; performing polarity screening on the wave head reflected by a fault point by using a modular maximum value; and obtaining the distance of the fault point by derivation according to the wave head arrival moment and a known power cable line length. According to the urban power cable double-end fault ranging method disclosed by the invention, a VMD-Hilbert transformation signal analysis method and a double-end traveling wave fault ranging method are combined and applied to power cable lines. Meanwhile, only a linear mode signal that is attenuated and weakened in a propagation process needs to be measured, and the used fault ranging formula used is not affected by the wave velocity. The ranging error caused by the uncertainty of the wave velocity in the power cable and a zero-mode component measurement thereof are avoided. The urban power cable double-end fault ranging method has a good engineering practice value in the power cable lines.

Description

technical field [0001] The invention relates to a double-terminal fault distance measurement method for urban power cables at the time of arrival of fault traveling waves. Background technique [0002] In the construction of urban power grids, it is gradually becoming a trend for power cables to replace overhead lines. Compared with overhead lines, they have the advantages of no need for ground space, high power supply reliability, and low possibility of electric shock. They are especially suitable for urban power supply. The power cable lines in the urban power grid have the characteristics of not long distances and are more used for fixed power distribution between two places. However, underground power cables are inconvenient to repair. Once a fault occurs, the fault needs to be removed in time according to the measured fault distance to avoid affecting the safe and stable operation of the line. [0003] At present, traveling wave ranging is widely used in overhead lines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 刘波滕松王丹梁睿
Owner JIANGSU ELECTRIC POWER CO
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