Power transmission line single end fault range finding method
A fault location and transmission line technology, which is applied to the fault location, detects faults by conductor type, and measures electricity, etc., can solve the problems affecting the power supply recovery time of fault lines, low fault location accuracy, and difficulty in finding fault points. The effect of speeding up the restoration of power supply, reducing comprehensive economic losses and reducing the burden of line inspection
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Embodiment 1
[0221] The present invention provides a single-end fault location method of a transmission line. The fault location method uses the sequence component method to set the voltage change of the transmission line as a quadratic function, and the known voltage, current and unit impedance of the transmission line head end Calculate the voltage of the short-circuit fault point and the distance from the short-circuit fault point to the head end. The fault location method is used for single-phase ground short circuit, two-phase ground short circuit, two-phase phase-to-phase short circuit and three-phase short circuit in a three-phase system.
[0222] (1) Under the single-phase-to-ground short-circuit situation, the single-phase-to-ground short-circuit fault model is as follows figure 1 As shown, the fault distance calculation formula is:
[0223]
[0224] in, is the phase voltage at the head end of phase A, is the phase voltage at the head end of phase B, is the phase voltage...
Embodiment 2
[0235] Based on Embodiment 1, the accuracy of simulating single-ended fault location by simulation:
[0236] (1) Establish a simulation model such as Figure 5 As shown, it includes a distributed parameter line module, a system power supply module, a three-phase circuit short-circuit fault generator element and a three-phase voltage-current detection module.
[0237] For distributed parameter line modules: the parameters R, L, and C of the line are evenly distributed along the line, and generally cannot be treated as concentrated parameter components, and some parameters are still functions of frequency. When studying short circuit and power flow, only power frequency positive sequence and zero sequence parameters are needed, which can be found in the manual or calculated. MATLAB simulation toolbox provides two kinds of mathematical models of power transmission and distribution lines, respectively is lumped parameter U type chain model and distributed parameter Bergeron mathe...
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