Comprehensive on-line monitoring and fault early warning system for high-voltage cable

Abstract

The invention discloses a comprehensive on-line monitoring and fault early warning system for a high-voltage cable. The system comprises an independent power supply module, a data acquisition module,a data edge calculation and transmission module and a fault early warning module; the power supply module supplies power to the whole device in a mode of combining a solar cell panel and a high-capacity lithium battery pack; the data acquisition module can realize on-line monitoring of a cable work well lid, a water level and gas; the data edge calculation and transmission module and the fault early warning module collect and process cable operation data; tiny hidden dangers in cable operation can be found through continuous data monitoring, so that operation and maintenance personnel can handle the hidden dangers in time, the cable operation and maintenance difficulty is reduced, and operation safety of the cable is ensured. The monitoring device is wide in application range, can help theoperation and maintenance personnel to discover operation defects of the high-voltage cable in time, greatly reduces the operation and maintenance cost, shortens the fault power failure time, and maintains the stability of a power grid.

Description

technical field [0001] The invention relates to the fields of electric power industry, power cable equipment, cable on-line monitoring and the like, in particular to a comprehensive on-line monitoring and fault early warning system for high-voltage cables. Background technique [0002] In order to adapt to the construction of urban power grids and the development of modern enterprises, to ensure the safety and reliability of power supply systems, and to beautify the environment and save land for line corridors, the original criss-cross overhead transmission networks in cities are gradually being replaced by underground cable power supply systems. As the proportion of cable lines in transmission lines is getting higher and higher, the tasks of cable operation and maintenance personnel are becoming more and more onerous. The traditional manual cable operation and maintenance methods are not only costly, but also cannot detect cable operation defects in time, which can no longer...

AI Technical Summary

Problems solved by technology

As the proportion of cable lines in transmission lines is getting higher and higher, the tasks of cable operation and maintenance personnel are becoming more and more onerous. The traditional manual cable operation and maintenance methods are not only costly, but also cannot detect cable operation defects in time, which can no longer meet the requirements of cable operation and maintenance. Therefore, it is particularly important to realize the online monitoring of cables

[0003] However, in recent years, the development of high-voltage cable online monitoring technology at home and abroad is relatively slow, and the scope of promotion is relatively narrow, mainly because there are three major problems in this technology

[0004] (1) The power supply problem of the device cannot be solved

At present, there are two power supply methods for the cable online monitoring system: low-voltage power supply and current transformer. The low-voltage power supply can only be used for cables laid in tunnels, which greatly limits the application range of the equipment. Limited to the operating condition of the cable, if the cable load is low and the operating current is small, the system cannot operate normally

[0005] (2) Lack of an accurate and effective cable fault prediction technology

The ultimate purpose of the cable online monitoring system to collect real-time data such as current, temperature, and environmental parameters is to evaluate the cable operating status, find hidden dangers and defects in the cable, and predict cable faults. However, the accuracy of existing cable fault prediction technologies is not high. Reliability is not guaranteed

[0006] (3) There is no data transmission method with low power consumption, high coverage, and high security suitable for cables

At present, there are two main transmission methods in the power transmission system. One is to use wireless public traffic GPRS, CDMA or 4G transmission, which is suitable for long-distance transmission, but lacks a security control mechanism, and information security is at risk. At the same time, uploading a large amount of information data requires a large Working power supply; the other is through wired OPGW optical cable transmission, which has the characteristics of strong anti-interference and low loss, but the cost is high, and a full-scale optical fiber network needs to be laid

The high-voltage cable online monitoring equipment is generally installed outdoors, which cannot meet the work requirements of the above two methods for a long time

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