A cable insulation data online acquisition and processing system

Abstract

An online cable insulation data acquisition and processing system, including the monitored cable, is characterized in that: the control circuit at least includes: a data acquisition terminal, including a zero-sequence signal acquisition module and an insulation signal acquisition module; a data processing end, including amplitude acquisition and processing module and phase acquisition and processing module; and a central processing unit, the input terminals of which are respectively connected to the output terminals of the amplitude acquisition and processing module and the phase acquisition and processing module. Through this cable insulation data online acquisition and processing system, the online monitoring of the cable insulation state is realized, and the cable insulation state can be detected online, which avoids the disadvantages of the prior art that require power failure for cable insulation detection, and is helpful for timely The cable insulation fault was found to ensure the safe and reliable operation of the cable.

Description

technical field [0001] An on-line acquisition and processing system for cable insulation data belongs to the technical field of cable fault detection. Background technique [0002] Cable is an indispensable transmission device in the power industry. The quality of cable insulation is the key factor affecting the safe and reliable operation of cables. In the actual operation of cables, most cable failures are caused by the deterioration of cable insulation. The structure of the cable generally includes an external insulation layer and a shielding layer. When the insulation layer is damaged, the insulation performance of the cable will decrease. The time between the cable and the grounding terminal can be equivalent to grounding resistance and grounding capacitance. When the performance of the cable decreases, the verticality of the grounding resistance and grounding capacitance will change. [0003] The existing cable insulation test method is to inject a large voltage into ...

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Problems solved by technology

[0003] The existing cable insulation test method is to inject a large voltage into the shielding layer to test the insulation performance of the cable after the shielding layer and the grounding terminal are disconnected. Since the cable is in operation, the shielding layer must be grounded, and the phase shielding layer must be grounded. The voltage value of the injected voltage cannot exceed 50V. Therefore, in the prior art, the insulation performance of the cable cannot be tested online. It must be carried out after the cable is powered off. Once the cable is powered off, it will affect the power consumption of a large number of users. even cause immeasurable economic losses

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