Double-sampling rate distribution network line fault point positioning method based on traveling wave method

A double sampling rate, line fault technology, applied in the direction of the fault location, etc., can solve the problems of high sampling rate, small fault traveling wave amplitude, and not widely used, so as to reduce the sampling time window, increase the trigger speed, The effect of reducing the amount of calculation

Inactive Publication Date: 2019-06-21
SHANGHAI JIAO TONG UNIV
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  • Claims
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Problems solved by technology

However, the complex line structure and numerous branches of the distribution network lead to small fault traveling wave amplitude and large attenuation distortion, which makes it difficult to locate distribution network faults.
However, the current fault traveling wave detection device usually uses the traveling wave amplitude as the fault criterion, which leads to misjudgment and missed judgment of the fault, and it is difficult to obtain a better fault traveling wave recording waveform; The sampling rate of the equipment is high, and the hardware performance of the equipment is high, and it is not widely used in the case of low-cost control of the distribution network

Method used

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  • Double-sampling rate distribution network line fault point positioning method based on traveling wave method
  • Double-sampling rate distribution network line fault point positioning method based on traveling wave method
  • Double-sampling rate distribution network line fault point positioning method based on traveling wave method

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Embodiment

[0034] Step S1, according to the phase current data measured by the low sampling rate measuring equipment, to image 3 For example, take the power frequency cycle P=0.02s, the time interval Q=0.005s, and calculate the correlation degree K between the corresponding first phase current waveform I1 and the second phase current waveform I2 from t=0;

[0035] Step S2, determine the size of the correlation degree K and the set threshold 0.99. If K>0.99, it is judged that the fault does not occur, return to step S1, and set t=t+0.005(s); if K≤0.99, record the fault occurrence period T: (t+0.02) to (t+0.025), for The waveform of the high-sampling-rate measuring device during the T period is recorded and stored.

[0036] Step S3, process the phase current waveform collected by the high-sampling-rate measurement device that starts the wave recording, to Figure 4 As an example, the arrival time T of the initial traveling wave at nodes 1 to 6 is obtained 1 ~T 6 with traveling wave po...

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Abstract

The invention discloses a double-sampling rate distribution network line fault point accurate positioning method based on a traveling wave method. The method is characterized by carrying out phase correlation calculation on a phase current waveform collected by a low sampling rate measuring device; when a fault is determined to generate, starting a wave recording function of a high sampling rate measuring device; and then, processing the phase current waveform collected by the high sampling measuring device, and carrying out accurate positioning of fault points according to a D-type travelingwave method. An unreliable problem of traditional amplitude triggering wave recording is solved through carrying out correlation coefficient calculation on waveform data. The correlation calculation is only performed on low sampling rate data, which effectively reduces a calculation amount and improves a fault wave recording triggering speed. Simultaneously, the adopted high sampling rate measuring device has a small sampling time window and does not depend on a large storage capacity so as to effectively reduce cost of a distribution network detecting device.

Description

technical field [0001] The invention relates to a fault diagnosis method for a distribution network line, in particular to a method for locating a fault point of a distribution network line with a double sampling rate based on a traveling wave method. Background technique [0002] With the continuous development of the economy, users have increasingly higher requirements on the quality of power supply. As the part of the power grid that directly interacts with users, the distribution network has a major impact on the user's power consumption experience, and the fault location of the distribution network is particularly important. At present, the domestic distribution network mostly adopts the neutral point non-effective grounding method, the topology structure is complex, and there are many branches; the ground fault current is small, and the fault location is difficult. With the improvement of people's requirements for distribution network automation level, it is more urge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 刘亚东李科君罗林根钱勇盛戈皞江秀臣
Owner SHANGHAI JIAO TONG UNIV
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