Online monitoring and evaluation method and system for shielding effectiveness of shielding layer of communication cable

Abstract

The invention discloses an online monitoring and evaluation method and system for the shielding effectiveness of a shielding layer of a communication cable. The method comprises: on the basis of a cable segmented frequency sweeping measuring method, fault identification and positioning of a cable shielding layer are carried out; with a loop impedance measurement method, the state of a grounding resistor of the cable shielding layer is determined; comprehensive analysis and reverse evaluation of the shielding effectiveness of the cable are carried out by using an algorithm. According to the invention, reasonable quantitative evaluation of the shielding effectiveness, which can not be evaluated easily in the prior art, of the shielding layer of the communication cable is realized; and a problem of the safety field of the communication cable shielding is solved. Meanwhile, with measurement of various cable physical parameters, systematic, holistic and complementary evaluation of the cableshielding layer is realized.

Description

technical field [0001] The invention belongs to the technical field of communication cable shielding, and more specifically, the invention relates to an online monitoring and evaluation method and system for the shielding effectiveness of a communication cable shielding layer. Background technique [0002] Communication cables refer to cables used for short-distance audio communication and long-distance high-frequency carrier digital communication and signal transmission. They are widely used in communication line transmission, instrumentation, electric power and other important fields. Usually, communication cables have a shielding layer, which enhances the mechanical strength of the cable on the one hand, and plays the role of shielding electromagnetic signals on the other hand, so as to ensure the information security of line communication. In the field of communication, especially in applications with high requirements for information security, it is usually required to ...

AI Technical Summary

Problems solved by technology

However, because the capacitive signal is too single and the amount of information on the status of the carrying cable is limited, it is difficult to locate and analyze the cable in a complex environment.

At the same time, due to the mismatch of the input impedance of the transmission line in the signal source, the measurement accuracy is low and the error is large

In addition, this method cannot accurately estimate the attribute information such as the length of the cable and whether the characteristic impedance of the cable changes.

[0005] The prior art provides a method for evaluating the status of the cable shielding layer by monitoring the power of the frequency-sweeping reflected signal, but on the one hand, the evaluation of the shielding effectiveness of the cable shielding layer is not comprehensive enough, and it can only be judged whether the cable shielding layer is damaged or not. The grounding condition of the cable shielding layer; on the other hand, when the fault of the cable shielding layer is judged by measuring the power, the fault location cannot be directly realized

[0006] The static full shielding method of the communication cable disclosed in the prior art can realize the static full shielding of the cable shielding layer during the cable deployment process, but cannot realize the dynamic monitoring of the shielding state

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