Fault positioning method for transmission line

A fault location and transmission line technology, applied in the field of power system, can solve problems such as reducing positioning reliability, affecting fault location accuracy, traveling wave wave head measurement error, etc., to achieve the effect of ensuring reliability and accuracy
CN101776725BInactive Publication Date: 2011-07-20SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Publication Date
2011-07-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a fault positioning method for a transmission line and belongs to the technical field of power systems. The fault positioning method comprises the following steps: arranging a Rogowski coil-based broadband core-through traveling wave detection device on the high-voltage transmission line; acquiring a current traveling wave signal of a three-phase line; performing singular value detection by applying the phase mode conversion and wavelet mode maximum principle; accurately identifying the traveling wave line mode wave head, and accurately determining the wave head arrival time by using a GPS high-precision clock; and measuring the wave speed of real-time traveling wave mode on line according to different wave head time difference information to realize accurate faultpositioning. The fault positioning method has the advantages of effectively avoiding two main factors influencing the traveling wave fault positioning precision, along with high positioning precisionand accurate and reliable fault positioning result.
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Description

technical field

[0001] The invention relates to a method in the technical field of electric power systems, in particular to a fault distance measurement method for transmission lines. Background technique

[0002] After a fault occurs on a high-voltage transmission line, a transient traveling wave running to both ends will be generated at the fault point. When the transient traveling wave encounters an inhomogeneous medium during propagation, refraction and reflection will occur. Using the fault information contained in the transient traveling wave, theoretically accurate fault location can be achieved. Scholars and experts at home and abroad have done a lot of research on traveling wave ranging technology. By installing traveling wave detection devices on the secondary side (low voltage side) of voltage and current transformers in substations, various methods based on single-ended or double-ended methods can be used. This positioning algorithm completes fault distance meas...

Claims

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