Traveling wave amplitude attenuation theory-based transmission line fault positioning method
A technology of transmission lines and attenuation theory, applied in the direction of fault location, fault detection according to conductor type, information technology support system, etc., can solve the difficulty of realization, increase the weight and maintenance cost of the traveling wave double-ended positioning device, and the high-frequency component is fast and other problems, to achieve the effect of simple fault location method, easy calculation and verification, and overall simplification
Active Publication Date: 2019-01-15
HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0003] Traveling wave double-terminal positioning needs to accurately obtain the absolute time of the traveling wave head, so the traveling wave double-terminal positioning device usually uses a high-precision GPS clock, and the accuracy needs to be within 100ns. However, the transient traveling wave generated by the fault point has a continuous spectrum. In the step signal, the high-frequency component is fast and the low-frequency component is slow, so that the high-frequency component arrives at the measurement point first, and the low-frequency component arrives at the measurement point later, which brings difficulties to the accurate calibration of the arrival time of the traveling wave head. In addition, the GPS clock Accurate time synchronization leads to complex algorithms, high calculation costs, difficulty in implementation, and poor applicability. The installation of a high-precision GPS module in the traveling wave positioning device not only increases power consumption, but also complicates the device system, greatly increasing the speed of traveling wave double-ended positioning. Unit weight and maintenance costs
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[0029] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.
[0030] see figure 1 , a transmission line fault location method based on the traveling wave amplitude attenuation theory, which can use the principle that the amplitude of the traveling wave is exponentially attenuated during the transmission process on the line to judge the fault point of the transmission line. The specific steps are:
[0031] S1. Install traveling wave monitoring equipment at the substations at both ends of the transmission line, and at the same time install traveling wave monitoring equipment at any position of the transmission line;
[0032] S2. When a fault occurs, compare the polarity of the main wave head of the traveling wave circuit collected by the traveling wave monitoring equipment at both ends of the transmission line and the tra...
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The invention provides a traveling wave amplitude attenuation theory-based transmission line fault positioning method. According to the method, transmission line fault points can be judged by utilizing a principle that amplitudes of traveling waves are continuously attenuated like indexes in propagation process on lines, so that the method is simple and convenient, line traveling wave monitor devices are integrally simplified, the feasibility is higher, the fault positioning method is simpler and calculation and verification are easy.
Description
technical field [0001] The invention relates to the technical field of transmission line fault location, in particular to a transmission line fault location method based on traveling wave amplitude attenuation theory. Background technique [0002] At present, the traveling wave location of line faults is divided into traveling wave single-ended or double-ended positioning methods. The single-ended method is based on the time when the traveling wave at the fault point reaches the traveling wave positioning device on the line for the first time and the time when the traveling wave arrives at the device after reflection, as well as the traveling wave on the line. The propagation speed of the fault point is used to calculate the distance from the fault point to the traveling wave locating device. Since the refraction and reflection of the traveling wave at the characteristic impedance change is relatively complicated, it cannot be used in many line structures and fault conditions...
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Login to View More IPC IPC(8): G01R31/08
CPCG01R31/085Y04S10/52
Inventor 赵海龙林盾徐钟祝王录亮庞松岭林桃贝张小店
Owner HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST