Circulation monitoring data collecting device of urban network cable

Abstract

The invention relates to a circulation monitoring data collecting device of an urban network cable. The circulation monitoring data collecting device mainly consists of an open-type current transformer, a communication module, a forward channel signal arranging unit, and a CPU (central processing unit) data collecting and processing unit. The circulation monitoring data collecting device is characterized in that the open-type current transformer is arranged in an open manner and is on an outgoing line of a cable sheath; the open-type current transformer is connected with the forward channel signal arranging unit; the forward channel signal arranging unit comprises a protective circuit, an isolating operational amplifier and a voltage compensation circuit; the forward channel signal arranging unit is connected with the CPU data collecting and processing unit, and the CPU data collecting and processing unit is connected with the communication module. The data of grounding induced circulation of the open-type current transformer of each cable is received; the data of the grounding induced circulation of the open-type current transformer of each cable is collected and transmitted to a microprocessor; the communication module is controlled to transmit an alarm message to a host computer when the situation that the grounding induced circulation exceeds the set grounding induced circulation limit value is found out, and various commands of the host computer are responded by wireless communication. Therefore, the system maintainability is simple, and the data is effectively collected to detect and judge a cable state.

Description

technical field [0001] The invention relates to a data acquisition device for cable circulation monitoring of an urban power grid, which belongs to a data acquisition and transmission device and is applied to the monitoring of cable circulation data of an urban power grid. Background technique [0002] At present, the research on the status monitoring of power cables basically takes the main insulation of the cable as the research object, but the research on the on-line monitoring of the insulation of the cable protective layer has been ignored. This online monitoring technology for main insulation cannot prevent the formation of main insulation defects and hidden dangers. This is the main drawback of current monitoring for main insulation. At the same time, there are still some shortcomings such as difficult technical realization and unsatisfactory practical application effect. [0003] Because many faults of power cables will be manifested as grounding induction circulat...

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Problems solved by technology

[0004] Since the structure of the high-voltage cable adopts a single-core structure, it will inevitably cause an induced voltage on the metal sheath from the electromagnetic principle. If the grounding method is improper, the induced voltage will form a large induced current on the metal sheath, which will It brings two major hazards to the cable transmission line: one is to greatly reduce the ability of the cable to transmit power (about one-third), and the other is to cause the metal sheath to heat up so that the main insulation is reduced and the normal operating life of the cable is shortened.

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