Optical fiber asynchronous triggering-based high-speed rail substation-used cable partial discharge positioning device

Abstract

The invention discloses an optical fiber asynchronous triggering-based high-speed rail substation-used cable partial discharge positioning device, which comprises a high-frequency current sensor, a partial discharge acquisition module, a triggering and communication module and a data analysis module, wherein the partial discharge acquisition module adopts digital filtering and amplification conditioning, partial discharge signals sensed by the high-frequency current sensor are subjected to analog-to-digital conversion, the data are then transmitted to an upper computer through the triggering and communication module, and synchronous data are calculated by data analysis by upper computer software, and partial discharge positioning is carried out. The triggering signals sequentially triggerthe acquisition devices through the optical fiber, the acquisition devices sequentially acquire partial discharge signals, the signals are then transmitted to the upper computer through the optical fiber, the upper computer can realize ns-level synchronization accuracy of the acquired data after compensation based on inherent delay between acquisition devices, and thus, partial discharge positiondiagnosis can be carried out.

Description

technical field [0001] The invention belongs to the technical field of electric cable partial discharge detection, and in particular relates to a cable partial discharge positioning device for high-speed railway substations based on optical fiber asynchronous triggering. Background technique [0002] Partial discharge is one of the important parameters for detecting insulation degradation of high-voltage power cables. It is particularly important to be able to detect correctly and have fault location. There are two main types of partial discharge location. One is the traveling wave method, which detects the original signal of partial discharge and The time difference of the signal after the signal goes back and forth is used to calculate the partial discharge position. The other is to detect the signal at both ends of the discharge source at the same time, and calculate the discharge position according to the time difference of the two synchronous signals; the traveling wave ...

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Problems solved by technology

[0002] Partial discharge is one of the important parameters for detecting insulation degradation of high-voltage power cables. It is particularly important to be able to detect correctly and have fault location. There are two main types of partial discharge location. One is the traveling wave method, which detects the original signal of partial discharge and The time difference of the signal after the signal goes back and forth is used to calculate the partial discharge position. The other is to detect the signal at both ends of the discharge source at the same time, and calculate the discharge position according to the time difference of the two synchronous signals; the traveling wave method only needs one device, and the method is simple, but On-site detection has large electromagnetic interference and small partial discharge signals, and the returned signal is easily overwhelmed by background noise, making it difficult to locate. The key to double-ended synchronous acquisition and positioning lies in the synchronization accuracy of the two devices, so most double-ended synchronous acquisition and positioning mainly lies in How to improve the synchronization accuracy of the device

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