Cable running safety evaluating method

Abstract

The present invention is cable running safety monitoring method, evaluation method and device, and belongs to the field of cable running safety monitoring technology. The cable running safety monitoring method is to monitor overheat of cable wires and send alarm based on the preset fixed threshold and trend threshold. The cable running safety evaluation method includes recording cable surface temperature, environment temperature and cable current value regularly, establishing cable surface temperature regression model, predicting cable surface temperature trend, and performing the mathematic analysis on the predicted value and the measured value residual error to evaluate the cable running status. The present invention also proposes equipment comprising temperature measuring element, data transmission line, data acquiring circuit module, data converting circuit and computer. The present invention has temperature measuring precision up to 0.5 deg.c, fast storing and other advantages.

Description

[0001] This application is a divisional application with application number: 200510011911.5, application date: June 10, 2005, and title of invention: a monitoring and evaluation method and device for cable safety operation. Technical field: [0002] The invention belongs to the technical field of cable safety operation monitoring, and in particular relates to a cable safety operation monitoring and cable safety operation evaluation method and a device thereof. Background technique: [0003] High-voltage cables are frequently used in modern industrial enterprises and play a huge role in industrial and agricultural production, but the probability of cable accidents is increasing year by year. Once a cable safety accident occurs, the light one will be cut off, the production will be stopped for maintenance, and the serious one will cause a serious fire accident. The consequences are very serious, and the repair work is also extremely difficult. The economic loss caused by it can...

AI Technical Summary

Problems solved by technology

The biggest advantage of the infrared sensor is non-contact measurement, so it has good safety. Its disadvantages are complex structure, poor anti-interference ability, and high environmental requirements; thermocouple transmission signals need to use special compensation lines, and the transmission distance should not be too long. It is not suitable for cable temperature monitoring; the thermistor is usually platinum resistance, and generally needs to use three-wire transmission, balanced bridge output, the transmission distance should not be too long, and the ability to resist interference is poor; semiconductor PN junction and temperature control Thyristor type sensors are also not suitable for monitoring the temperature of cables

[0006] Therefore, although a variety of temperature measurement methods have been applied to the temperature measurement of the outer wall of the cable, the overheating phenomenon of the cable has the characteristics of high concealment, slow early temperature rise, and difficult detection.

Under normal circumstances, from the overheating of the cable head to the occurrence of the accident, the whole process develops slowly and takes too long, and the early temperature rise is not obvious, so it is difficult to monitor effectively with existing measurement methods

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