Communication cable shielding layer remote grounding resistance measurement device and method

Abstract

The invention discloses a communication cable shielding layer remote grounding resistance measurement device and method. A sine wave signal generator module is configured to generate frequency-adjustable sine signals as a measurement signal source through a DDS technology; an adjustable power amplification module adjusts the size of transmission power of measurement signals according to actual needs; a current sampling module performs sampling and calculation on output current of the measurement signals, a current value of the measurement signals is finally obtained, and grounding resistance calculation is carried out; and a resistance calculation module uses an Ohm law to calculate and obtain the current resistance value through the obtained measurement current value and the power value.

Description

technical field [0001] The invention relates to a device and method for measuring the remote grounding resistance of a shielding layer of a communication cable. 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. [0003] In the private network communication network, it is of great significance to effectively monitor the grounding resistance of the cable shielding layer. [0004] First, ensure the security of information. In wired communication, the cable shielding layer is used to effectively block the electromagnetic wave emission from the inner core to the surrounding environment, and one of the important prerequisites for the shielding effect of the shielding layer is that the shielding layer is well grounded. [0005] Second, ensure communication quality and reliability. Electromagnetic interference from outside the cable ...

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Problems solved by technology

[0009] Common problems in monitoring grounding resistance by instrument method: 1) Real-time online monitoring cannot be realized; 2) Measurement accuracy is easily affected by human factors; 3) High traffic and labor costs caused by measurement

However, it does not monitor the grounding resistance of the shielding layer at the user end relative to the local end, which is concerned by cable maintenance personnel.

[0012] The invention patent number is "201510574308.1" based on the complex impedance measurement of the grounding performance monitoring device and method of the cable shielding layer, and invented a kind of online measurement of the complex impedance of the shielding layer to the earth, which can measure the aging, corrosion and non-open circuit damage of the shielding layer , to ensure the security of communication information, the device and method of the reliability of communication quality, its principle is to evaluate the integrity of the shielding layer by measuring the complex impedance between the shielding layer and the earth, when the shielding layer is damaged, it will cause The distributed impedance between the cable shielding layer and the ground at this position changes, so although it can monitor the integrity of the cable shielding layer and locate faults, it cannot measure the grounding resistance of the cable shielding layer at the user end to the earth at the telecom office end value, it is impossible to measure the ability of the cable shield to absorb noise or lightning energy

In other words, this patent also does not effectively monitor the remote grounding resistance index

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