Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge
A cable intermediate joint and partial discharge technology, which is applied in the direction of testing dielectric strength, can solve the problem of inability to detect partial discharge of directly buried cables, and achieve the effect of convenient measurement
Active Publication Date: 2013-03-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF8 Cites 17 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to provide an on-line detection method for the partial discharge of the middle joint of the three-phase cross interconnection cable, so as to overcome the shortcomings that the partial discharge of the directly buried cable cannot be detected by the current detection of the partial discharge of the cable
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 Construction
[0030] like figure 1 As shown in the embodiment of the present invention, a method for on-line detection of partial discharge at the middle joint of a three-phase cross-interconnection cable, respectively uses a capacitance sensor 1 to connect the bolts of the cross-connection busbar in the three-phase cross-interconnection box 2, and the capacitive sensor 1 The coupled partial discharge pulse signal passes through the sensor cable 3 and the detection impedance 5. At the same time, a protective gap 4 is connected in parallel at both ends of the detection impedance 5. The signal is led to the outside of the interconnection box through the BNC head 6, and connected to the oscilloscope 8 through the measurement cable 7. , the oscilloscope 8 displays the detection result of the detection impedance 5 .
[0031] When detecting partial discharge in an actual power system, there will be interference transmitted from the ground wire and space to the cross interconnection line, which wi...
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 inspection method of three-phase cross interconnected electric cable intermediate head partial discharge. The online inspection method of the three-phase cross interconnected electric cable intermediate head partial discharge comprises the following steps of (1) connecting three capacitive sensors with bolts, (2) connecting the three capacitive sensors with cable cores, (3) connecting the cable cores with detecting impedance, (4) connecting three pieces of detecting impedance and the outer skin of sensor electric cables and connecting the three pieces of detecting impedance and the outer skin of the sensor electric cables with the ground, (5) connecting the three pieces of detecting impedance with protective gaps in parallel, (6) connecting the detecting impedance with bayonet nut connectors (BNC), (7) connecting the BNC connectors with a oscilloscope, and (8) judging whether the electric cables have partial discharge through the oscilloscope. The online inspection method of the three-phase cross interconnected electric cables intermediate head partial discharge has the advantages of being used in detection when the electric cables run online, free from influences on power supply of a circuit, enabling the capacitive sensors and the detecting impedance to be installed in a interconnection box, only three measuring electric cables to be led out of the BNC connectors on the outer wall of the interconnection box in measurement and the measurement to be convenient, being safe and reliable, enabling a user to observe graphic information of detection signals directly through the oscilloscope and being capable of judging whether the electric cables have the partial discharge.
Description
technical field [0001] The invention relates to an on-line detection method for the partial discharge of the middle joint of a three-phase cross-interconnection cable, in particular to a method for on-line detection of the partial discharge at the middle joint of a three-phase cross-interconnection cable with a capacitance sensor. Background technique [0002] At present, the on-line partial discharge detection of cables at home and abroad has developed from the traditional IEC60270 detection method to today's VHF (very high frequency) frequency band and even to the detection of UHF (ultra high frequency) frequency band, especially the detection of VHF (very high frequency) Detection is well established, but is based on the detection of pulsed current measuring coils in the vicinity of cable joints. For direct-buried cables, since only the cross-connection box is exposed on the ground, it is far away from the cable joint, and there is no good detection method. [0003] The ...
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 王伟陈胜科杨凯何东欣杜家振顾杰峰李富平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap