A Fault Pole Selection Method Using Constructed Unbalanced Directional Voltage

A technology of balance and voltage, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of identifying interference and insufficient discrimination, and achieves the effect of simple algorithm, favorable for reliable pole selection, and simple logical structure
CN110632454BActive Publication Date: 2022-02-11KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Publication Date
2022-02-11

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Abstract

The invention relates to a faulty pole selection method utilizing structural unbalanced directional voltage, and belongs to the technical field of DC transmission line faulty pole selection. Firstly, read the measurement terminal voltage of the positive and negative bipolar lines obtained by the high-speed acquisition device at the measurement terminal; secondly, construct the unbalanced direction voltage for the obtained voltage, and calculate the attenuation energy according to the waveform of the unbalanced direction voltage, and then The energy of the unbalanced direction voltage attenuation of the positive line is compared with the energy of the unbalanced direction voltage attenuation of the negative line, and the fault pole is obtained according to the ratio. If the ratio is greater than 2, it is a positive line fault; if the ratio is less than 0.5, then It is a negative line fault; if the ratio is between 0.5 and 2, it is a two-pole line fault.
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Description

technical field

[0001] The invention relates to a faulty pole selection method utilizing structural unbalanced directional voltage, and belongs to the technical field of DC transmission line faulty pole selection. Background technique

[0002] HVDC transmission plays an important role in long-distance and high-power transmission due to its large transmission capacity, low line cost, and good control performance. Due to the long transmission distance of the HVDC transmission system, the transient harmonic content after the fault is rich, which makes the coupling effect between the poles of the transmission line significant. Inductive electric quantity is generated in the healthy pole circuit, which causes the protection malfunction of the healthy pole line, so it is particularly important to select the pole reliably. In the past, our pole selection was based on the simulation analysis of the coupling characteristics of the UHV DC bipolar transmission line and its influencing...

Claims

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