A single-ended traveling wave fault location method

A technology of fault distance measurement and single-ended traveling wave, which is applied in the direction of the fault location, etc., can solve the problems of difficult identification and impracticality of the wave head, and achieve the effect of increasing the reliability of distance measurement, speeding up the distance measurement speed and reducing the chance of error

Active Publication Date: 2017-12-29
湖北泽丰电力设计有限公司
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Problems solved by technology

[0008] The present invention provides a single-end traveling wave fault location method, which is a method for directly finding the reflected wave of the fault point and the reflected wave of the opposite end busbar, which meets the demand for fast and accurate location of the fault point and can solve the current single-ended traveling wave fault The impractical problem caused by the ranging technology is not easy to identify the wave heads

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  • A single-ended traveling wave fault location method
  • A single-ended traveling wave fault location method
  • A single-ended traveling wave fault location method

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Embodiment approach

[0064] 1), installing a traveling wave acquisition and processing device 5 at the substation bus bar 2 at one end of the line 1;

[0065] 2) Install a suitable series component of capacitor 6 and resistor 7 at the bus bar at the other end of the line; choose the capacitance range of 10pF-1μF, less than 10pF will make the waveform change insignificant, and greater than 1μF will affect the reactive power balance of the line, which may cause no Too much work.

[0066] 3) When a fault occurs on the line 1, the fault wave 4-1 sent by the fault point 3, the fault wave 4-2 propagates to both ends of the line, and refraction occurs at the bus bars at both ends, and the traveling wave acquisition and processing device 5 Record the waveforms of each wave, and directly find out the first arriving wave 4-1 and a wave 4-2-2 with obvious difference in waveform characteristics. Using the arrival time of the wave head of these two waves, the distance can be accurately measured. The arrival ...

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Abstract

A single-ended traveling wave fault location method, which uses electrical components that can change the characteristics of the traveling wave waveform at the opposite end bus to change the characteristics of the reflected wave waveform of the opposite end bus, making it significantly different from other traveling wave waveforms ; When the reflected wave is passed back to the reference end, the traveling wave acquisition and processing device at the reference end will record the waveform, because there is a significant difference between the reflected wave waveform of the opposite end bus and other waveforms, it can be directly obtained from multiple Find the reflected wave of the opposite-end bus in the waveform; bring the time data corresponding to the first wave and the reflected wave of the opposite-end bus into the corresponding ranging formula, and the ranging can be completed. A single-end traveling wave fault location method of the present invention adopts the method of marking the reflected wave of the opposite end, and directly identifies the reflected wave of the bus at the opposite end from the numerous wave head information at the traveling wave acquisition and processing device end, and uses the wave head information The distance measurement is completed, and the operation is simple and convenient. It does not require complicated calculation and transformation, and can be used independently.

Description

technical field [0001] The invention discloses a single-end traveling wave fault ranging method, which belongs to the technical field of electric power system relay protection. Background technique [0002] Failure of power transmission lines will not only affect human industrial production and daily life, but also endanger the safe and stable operation of the power system in severe cases. Fault location technology based on traveling waves is an important method for precise and fast fault location of transmission lines. Single-ended traveling wave fault location technology is a kind of traveling wave fault location technology, its principle is simple, easy to implement, and low cost. However, under the existing conditions, it is difficult to distinguish the reflected wave of the fault point and the reflected wave of the busbar at the opposite end and the healthy line. [0003] Chinese patent "Fault Location Method Based on Single-End Ranging" (CN102253315A), the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 邓长征彭永康邱立赵习武肖东
Owner 湖北泽丰电力设计有限公司
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