Low-voltage distribution line online impedance detection method and device
A low-voltage power distribution and detection method technology, applied in the field of power systems, can solve problems such as difficult to correctly obtain actual line loss, uncertain factors, and complex implementation, so as to improve power supply reliability, reduce fault occurrence, and simple implementation Effect
Active Publication Date: 2020-12-29
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
For the impedance of the distribution line, it is usually obtained through the analysis of the line power loss at present, but this type of method is complicated to implement, and there are uncertain factors in the line loss analysis, it is difficult to correctly obtain the actual line loss, and the analysis of the line power loss The resulting impedance is only an estimate, so the accuracy is not high
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[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.
[0030] like figure 1 As shown, the steps of the online impedance detection method for low-voltage distribution lines in this embodiment include:
[0031] S1. Obtain the voltage and current signals of the target distribution line monitored by the electric energy meter in real time, and calculate the voltage and current change rate within the specified time period;
[0032] S2. Determine the loop impedance value of the target distribution line according to the calculated voltage change rate and current change rate;
[0033] S3. Obtain the loop impedance value obtained within the specified time period, obtain the loop impedance change trend of the target distribution line, and evaluate the impedance change state of the target power distribution line according to t...
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The invention discloses a low-voltage distribution line online impedance detection method and device. The method comprises the steps: S1, obtaining voltage and current signals, monitored by an electric energy meter in real time, of a target distribution line, and calculating voltage and current change rates in a specified time period; S2, determining a loop impedance value of the target distribution line according to the calculated voltage change rate and current change rate; and S3, obtaining a loop impedance value obtained in the specified time period, obtaining a loop impedance change trendof the target distribution line, and determining an impedance change state of the target distribution line according to the loop impedance change trend. The method can achieve the online detection ofthe impedance of the low-voltage distribution line, achieves the real-time evaluation of the impedance change state of the distribution line, and has the advantages of being simple in implementationmethod, low in needed cost, good in real-time performance, high in detection precision and efficiency and the like.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for detecting the online impedance of a low-voltage distribution line. Background technique [0002] In the power system, smart meters are usually used to measure and count the electric energy of low-voltage distribution lines. After a long period of use, low-voltage distribution lines will gradually have problems such as line aging or equipment aging. Transmission faults affect the stability and reliability of power transmission. In order to ensure the stability and reliability of distribution lines, special fault monitoring equipment is usually set up to monitor line aging or equipment aging faults. However, this method is not only costly and complicated to operate, but also can only be detected after the fault occurs. For the fault of the line, it is impossible to predict the occurrence of the fault and deal with it in time, and the occurrence of the...
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Login to View More IPC IPC(8): G01R27/02
CPCG01R27/02Y04S10/52
Inventor 黄瑞余敏琪刘谋海贺星吴志勇杨茂涛柳青苏玉萍
Owner STATE GRID HUNAN ELECTRIC POWER