Online monitoring method for partial discharging of 500 KV cross-linked cable
A technology of partial discharge and cross-linked cables, which is applied in the direction of testing dielectric strength, etc., to prevent sudden operating failures and achieve the effect of condition-based maintenance
Inactive Publication Date: 2012-05-30
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
View PDF4 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a method for separating different discharges in order to overcome the above-mentioned defects in the prior art. On-line partial discharge monitoring method for 500 kV cross-linked cables to detect the insulation defect of the running cable, prevent the sudden operation failure of the power cable, and achieve the purpose of condition-based maintenance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0012] The partial discharge signal and low-frequency synchronization signal obtained from the sensor are transmitted to the host (PDCheck) through the coaxial cable. The host performs preliminary processing on the data, extracts the waveform features, and connects with the network card (RJ45) of the portable computer through the network transmission line, optical fiber, and photoelectric converter, and then transmits the features to the computer, and then uses special software to classify, separate and discharge. recognition. Its diagnostic technology includes the following aspects: signal acquisition and transmission, signal feature extraction, expert system identification, fault diagnosis and equipment state estimation.
[0013] 1) First, the discharge pulse waveform is obtained from the device port by a high-speed broadband sampler through a specific sensor (current or voltage coupling), and the waveform characteristics (including characteristic time domain parameters and ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an online monitoring method for the partial discharging of a 500 KV cross-linked cable, comprising the following steps of: (1) signal collection and transmission: acquiring partial discharging signals and low-frequency synchronous signals by a sensor; (2) signal character extraction: carrying out primary processing on data by a host machine to extract a waveform character and then mapping character parameters corresponding to all waveforms on a character spectrogram; (3) expert system identification: classifying and separating discharging types and identifying the discharging modes by a computer processor; (4) carrying out fault diagnosis and equipment condition estimation by the computer processor to obtain the partial discharging data of the cross-linked cable. Compared with the prior art, the invention has the advantage that different discharging types are separated, on the basis, the collected data are analyzed and judged by using a fussy logic method to further remove noise interference and classify and identify the partial discharging type, and therefore, the insulation defect of an operating cable is discovered, the emergent operation fault of a power cable is prevented and a condition maintenance purpose is realized.
Description
technical field [0001] The invention relates to an on-line monitoring method for partial discharge, in particular to an on-line monitoring method for partial discharge of a 500 kilovolt cross-linked cable. Background technique [0002] Partial discharge is a symptom and main cause of insulation degradation in cross-linked polyethylene (XLPE) cables. The partial discharge of high-voltage and extra-high-voltage XLPE insulated power cables is closely related to its insulation status. The change of partial discharge indicates that there are defects in the cable insulation that may endanger the safe operation life of the cable. Therefore, accurate measurement of the partial discharge of XLPE insulated power cables is important. The most intuitive, ideal and effective way to judge the quality of cable insulation. The on-site installation quality of 500kV joints is crucial to the safe operation of the entire cable system. The cable accessories are installed on site, and the manuf...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 金刚
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO