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Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement

A partial discharge detection and oscillatory wave technology, applied in the direction of testing dielectric strength, etc., can solve the problems of reflected signal distortion, partial discharge location difficulty, and reflection signal not collected, and achieve high positioning accuracy and simplified partial discharge location algorithm Effect

Active Publication Date: 2014-09-03
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Due to the limitations of single-ended detection, when the cable length is long, the reflected signal collected by the system is seriously distorted or the reflected signal cannot be collected, making it difficult to locate partial discharges. Therefore, the single-ended system can only detect partial discharges within a certain length The cables are tested for partial discharge, and the single-ended system has a certain error in the measurement of the cable length

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  • Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement
  • Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement

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Embodiment Construction

[0028] The working principle of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 Shown is the overall structural block diagram of the embodiment of the cable oscillatory wave partial discharge detection system of the present invention. The system includes a cable to be tested, an air-core inductor, a 30KV programmable high-voltage DC power supply, a high-voltage electronic switch without partial discharge, and a programmable wide-range partial discharge calibration. Instrument, signal acquisition subsystem, host computer. When the system is working, the circuit connection is as follows: 30KV program-controlled high-voltage DC power supply is connected with the air-core inductor and high-voltage electronic switch without partial discharge, the air-core inductor is connected with the tested cable and the high-voltage voltage divider, and the high-voltage voltage divider is connected w...

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Abstract

The invention discloses an oscillation wave partial discharge detection system for a cable based on double-end asynchronization. In a double-end asynchronization data acquisition mode, the system is characterized by comprising a cable to be detected, and an oscillation wave generation device, signal acquisition sub-systems, a program control wide-range partial discharge calibrator and an upper computer, which are respectively connected with the cable to be detected, wherein under the control of the upper computer, the oscillation wave generation device generates a damping oscillation wave; the signal acquisition sub-systems which are arranged at two ends of the cable transmit waveform and data measuring values which are acquired to the analysis software of the upper computer; and the analysis software performs centralized processing and analysis, judges whether partial discharge is generated, and determines the partial discharge amount, so that testing of the partial discharge of the cable is realized. The system has the advantage that: by adoption of a double-end measurement method, the testing accuracy and positioning accuracy of the partial discharge are greatly improved.

Description

technical field [0001] The invention relates to a cable oscillation wave partial discharge detection system based on asynchronous double-terminal measurement. It is suitable for partial discharge detection and defect location of cables. Background technique [0002] With the needs of the development of the power system and the improvement of users' requirements for the reliability of power supply, the reliability of high-voltage power equipment operation has received more and more attention. However, the insulation problem of cables in the power grid has become more and more prominent, which seriously affects the power supply. Improved reliability. The study found that the partial discharge of the cable is closely related to its insulation condition, and the change of the partial discharge indicates that the cable insulation may have defects that endanger the safe operation of the cable. Therefore, many experts and scholars at home and abroad and some international power a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 喇元田立斌田李超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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