A Fault Location Method Based on Lightning Overvoltage Slope Transformation Characteristics
A lightning strike overvoltage and fault location technology, which is applied in the direction of fault location, measurement of electrical variables, and fault detection according to conductor type, can solve the problems of low maintenance efficiency of distribution lines, unsimple operation and calculation, and high labor cost consumption, etc., to achieve The effect of improving the intelligence level of the power grid, improving accuracy, and saving labor costs
Active Publication Date: 2022-05-20
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0009] The invention provides a fault location method based on the characteristics of lightning overvoltage steepness transmission to solve the problems in the prior art that the operation and calculation are not simple enough, the labor cost is too large, the accuracy of fault location is low, and the power distribution line maintenance The problem of low efficiency
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
[0057] see Figure 1 to Figure 4 , the present invention is based on the premise that there is lightning overvoltage on the three-phase transmission and distribution line, and provides a fault location method based on the characteristics of lightning overvoltage steepness transmission. The method includes the following steps:
[0058] Setting several voltage monitoring sensors on the three-phase transmission and distribution line to monitor the voltage of the three-phase transmission and distribution line in real time;
[0059] Inject a voltage signal into the position x of the three-phase power transmission and distribution line, and find the position y and the position z in the interval [y, x] and the interval [x, z] adjacent to the position x two of the voltage monitoring sensors, and start recording the characteristic quantity of each of the voltage monitoring sensors;
[0060] calculating and recording the steep attenuation coefficients γ and δ of the injected voltage si...
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 provides a fault location method based on the characteristics of lightning overvoltage steepness transmission. A voltage monitoring sensor is installed on the line, a voltage signal is injected into a certain place on the line, and the endpoints of the intervals on both sides of the position are found to calculate the injected voltage. The steepness attenuation coefficient of the propagation of the signal in the interval on both sides of the position; when a lightning overvoltage occurs, find out the maximum steepness of the lightning overvoltage wave head and the corresponding position, and calculate the propagation of the lightning overvoltage signal in the interval on both sides of the position The steepness attenuation coefficient; according to the steepness attenuation coefficient obtained before and after the lightning strike fault, the section of the lightning strike point is judged; the distance between the lightning strike point and the voltage monitoring sensors on both sides is calculated, and the precise position of the lightning strike point is judged. The present invention utilizes the change of lightning strike overvoltage steepness within a certain time interval and the change of steepness attenuation coefficient before and after lightning strike fault, can accurately and quickly locate the lightning strike fault position on the line, reduces the workload of operation and maintenance operators, and improves the power supply reliability.
Description
technical field [0001] The invention relates to the technical field of lightning location for power transmission and distribution lines in a power system, in particular to a fault location method based on the characteristics of lightning overvoltage steepness transmission. Background technique [0002] As an important part of the power grid system, transmission lines have received more and more attention and attention in recent years with the development of smart grid construction. Installing various condition monitoring equipment on transmission line towers is the basic work of building intelligent transmission lines. At present, the construction of power grids in various places also regards it as the main development direction. [0003] Lightning is one of the main factors that endanger the safety of power systems. Lightning is extremely harmful to the safe operation of transmission lines, often causing insulator flashover accidents. Lightning strikes on transmission and d...
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 Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 刘红文张恭源赵现平柴晨超张春丽张扬
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST