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A square-wave pulse power supply for the positioning of cable intermediate joints

A cable intermediate joint, square wave pulse technology, applied in the direction of electric pulse generator circuit, energy storage element to generate pulse, electrical components, etc. Inaccurate positioning of the intermediate joint, etc., to achieve the effect of obvious features, short reed recovery time, and high signal-to-noise ratio

Active Publication Date: 2021-11-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a square wave pulse power supply for the positioning of the cable intermediate joint, which is used to solve the existing method because the existing square wave pulse power supply cannot produce a steep square wave edge and The technical problem of inaccurate positioning of the cable intermediate joint due to the low pulse amplitude

Method used

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  • A square-wave pulse power supply for the positioning of cable intermediate joints
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  • A square-wave pulse power supply for the positioning of cable intermediate joints

Examples

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Effect test

Embodiment 1

[0042] A square wave pulse power supply for the positioning of cable intermediate joints, such as figure 1 As shown, it includes: high-voltage module, high-voltage resistor, transmission line, relay control module and relay; wherein, the output end of the high-voltage module is connected to the input end of the relay control module and the transmission line respectively through the high-voltage resistor, and the output end of the transmission line is connected to the relay The reeds are connected, and the output terminal of the relay control module is connected with the pull-in coil of the relay;

[0043] The high-voltage module is used to output the adjustable DC voltage of the kilovolt level, power the relay control module, and charge the transmission line; specifically, in the process of positioning the middle joint of the cable, due to the serious attenuation and deformation of the traveling wave when the cable length is long, Considering that the input pulse waveform is a...

Embodiment 2

[0053] A method for positioning the middle joint of a cable using the square wave pulse power supply described in Embodiment 1 of the present invention, such as image 3 As shown, when using the square wave pulse power supply in Embodiment 1 to locate the intermediate joint of the cable, it is also necessary to cooperate with data acquisition devices such as an oscilloscope. In this embodiment, a four-section cable three-section joint test platform is built. The four-section cable body is a wave impedance 50Ω cable, and its length is 75m, 55m, 30m, 44m respectively. The intermediate joint is simulated by 75Ω coaxial line, and the length of each joint is 0.4m. An external 500MHz oscilloscope collects reflected waveforms through a 300V, 10MΩ, 3.9pF probe. Output square wave pulses with different modes and steep falling edges generated by the square wave pulse power supply to the cable to be tested. Since the impedance between the cable connector and the cable body is discontinu...

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Abstract

The invention discloses a square wave pulse power supply for the positioning of the intermediate joint of the cable. Combining with the actual situation of the transmission and attenuation of the traveling wave in the cable, the output of the square wave pulse is controlled by fast switching of different frequencies on the relay, and the output The square wave pulse has a steep edge, so that the reflected wave at the joint has the obvious characteristics of a pair of positive and negative peak signals, which is convenient for the identification of the reflected wave at the joint. In addition, the power supply uses a high-voltage module to output kilovolt-level adjustable DC voltage, and obtains a higher signal-to-noise ratio by increasing the input pulse amplitude, which alleviates the problem of serious attenuation of traveling waves when the cable length is long. Use the power supply for the positioning of the middle joint of the cable, and collect the reflected wave reflected by the pulse output by the power supply at the middle joint of the cable. So as to realize the accurate positioning of the cable connector.

Description

technical field [0001] The invention belongs to the field of electric equipment, and more specifically relates to a square-wave pulse power supply for the positioning of intermediate joints of cables. Background technique [0002] Compared with overhead lines, cable channels have high power supply reliability and are less affected by external factors such as force majeure. At present, more and more power transmission and distribution projects choose cables as an underground transmission method. With the popularization of cable lines and the extension of cable paths, the number of intermediate joints is also increasing. The cable intermediate joint is the weak link in the inspection of the cable channel. During the construction acceptance process, the power supply operators will install warning piles at the intermediate joint in order to facilitate the search for the joint position. Although this method can play a certain role in positioning, once the warning pile is artific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M9/02H02M1/32H03K3/53
CPCH02M1/32H03K3/53
Inventor 李柳霞吴昊谦林福昌张钦李化刘毅
Owner HUAZHONG UNIV OF SCI & TECH
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