A pre-alarm system and method for the ablation status of the protective layer of electric wires and cables

Abstract

The invention discloses a pre-alarm system and method for the ablation status of the protective layer of electric wires and cables. The conductive layer is arranged between the buffer layer and the protective layer, and the conductive body is distributed on the outer side of the protective layer according to the unit length and used to collect the corresponding length of the protective layer in sections. Capacitive current, the probe passes through the buffer layer, the sheath is connected to the detection layer and is used to conduct the capacitive current and sense the discharge arc between the sheath and the buffer layer, the detection layer includes a surge protection module connected to the probe, and a surge protection module Parallel detection modules, the surge protection module is used to suppress the surge current generated by the instantaneous discharge between the buffer layer and the conductor, the information processing device includes an information transmission module connected to the detection module, a control module connected to the information transmission module, In the warning module connected with the control module, the conductive layer obtains the capacitive current of the protective layer and transmits it to the detection layer to obtain early warning information for judging the cable ablation status. Improve work efficiency and accuracy.

Description

technical field [0001] The invention belongs to the technical field of electrician detection, and in particular relates to an early warning system and method for ablation status of a cable protective layer. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity is increasing, and cables are playing an increasingly important role in power generation, distribution, and power supply. Along with the large-scale and high-frequency use of cables, ablation of the cable protective layer, which is highly concealed and difficult to detect, often occurs. At the same time, there are more and more major accidents caused by the ablation of the cable protective layer. [0003] The Chinese patent with publication number CN110389283A discloses a cable buffer layer ablation state detection system and detection method. The system includes a detection module, a communication module, a state analysis platform and an alarm module. ...

AI Technical Summary

Problems solved by technology

But it has the following problems: firstly, the partial discharge phenomenon of the cable is a slowly developing process, and its discharge frequency is low at the beginning of the ablation phenomenon, and the partial discharge detector of the prior art cannot provide continuous detection. On the one hand, it is also difficult to implement due to the constraints of the specific environment; secondly, the leakage current in the ungrounded part of the cable middle shield is limited by the barrier of insulating materials such as the outer sheath, and it is extremely weak on the surface of the cable. Under the environment in the well, the existing technology relies on the detection of the shielding layer from both ends of the cable to calculate the leakage current value, including the corresponding detection method, which is also difficult to implement; finally, the protective layer of the cable is ablated from the corrugated aluminum sheath and The detachment of the buffer layer begins until it develops to the protective layer in the radial direction. The prior art is limited to using the distance between the corrugated aluminum sheath and the buffer layer to judge the ablation of the cable buffer layer. The aging condition of the protective layer that occupies an important position in the cable insulation fault is combined to make a comprehensive judgment, which cannot provide a reliable criterion for the early warning of the ablation status of the cable protective layer

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