Processing method of power cable temperature on-line monitoring data

A power cable and monitoring data technology, applied in the field of processing power cable temperature on-line monitoring data, can solve the problems of complex cable structure, low accuracy, lack of versatility of the "temperature field" model, etc., to prevent power outages and fire accidents, Improve accuracy and generality

Active Publication Date: 2013-05-01
HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY +2
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  • Abstract
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  • Claims
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Problems solved by technology

Due to the complex structure of the cable, the various materials, the manufacturing process of each manufacturer is very different, and the way of laying the cable and the environment in which the cable is located are also quit

Method used

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  • Processing method of power cable temperature on-line monitoring data
  • Processing method of power cable temperature on-line monitoring data
  • Processing method of power cable temperature on-line monitoring data

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Embodiment Construction

[0024] The technical solutions of the present invention are described below with reference to the accompanying drawings.

[0025] like figure 1 As shown, the online temperature monitoring data of the power cable is processed according to the following specific calculation steps:

[0026] (1) Uniform natural sampling: The surface temperature value of the cable head collected at a certain time is taken as a time domain sampling signal value, and the sampling period is , set to collect the surface temperature data of the cable head every equal time, the sampling frequency is , the sampled temperature function yes The sampling process is completed by multiplying the rectangular sampling pulse sequence with the actual continuous function of the surface temperature of the cable head:

[0027] ;

[0028] (2) Fast Fourier Transform (FFT): Fast Fourier transform the sampled discrete temperature signal function to obtain the spectral function of the discrete temperature signa...

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Abstract

The invention discloses a processing method of power cable temperature on-line monitoring data; through the analyses on main factors affecting the cable surface temperature, the interference components are filtered away for the obtainment of a temperature change rate curve of cable surface without the main interference factors; according to the temperature change rate curve, the cable temperature abnormalities are captured; the processing method of the power cable temperature on-line monitoring data is a new method for processing cable temperature monitoring values; with the adoption of the new method, no temperature field models of cable interior and exterior spaces are established; a data sampling model is rapid to respond; the sampled data precision is high; the waveform is not distorted; the parameters of cable structure, material, environment, laying way and the like are not required to be defined; the frequency domain filtering is performed on the data of the cable surface temperature values for the removal of affection caused by the diurnal temperature change; according to a wave superpositioning formula, the affection of the annual temperature change is removed; and therefore, the generality is better, the precision of judgment on the cable temperature abnormalities by a cable temperature on-line monitoring system can be improved, and the occurrence of power failure and fire accidents resulting from cable head overheating is effectively prevented.

Description

technical field [0001] The invention relates to a method for processing power cable temperature online monitoring data, and belongs to the technical field of power equipment online monitoring. Background technique [0002] Due to the particularity of the power cable (hereinafter referred to as the cable) itself, especially the insulation performance of the intermediate joint part is the weakest, this is the most concentrated part of the cable fault. During the operation of the cable, many faults are gradually formed by the development of tiny defects. During this gradual process, accompanied by abnormal heating, the temperature of the defect point is abnormally increased. Through continuous and uninterrupted monitoring of the temperature of the cable, the early overheating fault of the cable can be detected in advance, the probability of the cable fire can be effectively reduced, the early prediction of the cable overheating fault can be realized, and the problem can be prev...

Claims

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Application Information

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IPC IPC(8): G01K3/00
Inventor 许明生沈明吴晓飞
Owner HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY
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