Method for monitoring and evaluating safe operation of cable and device thereof

Abstract

The invention is the monitoring and judging method of safe running of the cable and its equipment. The characteristics are: the said monitoring method through the pre-set fixing threshold and trend threshold sends the alarming information of the overheating situation of the cable core in time; the said judging method is according to the cable surface temperature, the ring temperature and the current value automatically stored to establish the cable surface temperature regression model and forecast the operation trend of the cable surface temperature and promote the judgment through the mathematical analysis of the difference between the forecasting value and the tested value. The invention also provides the device composed of the corresponding thermometric component, the data transmitting wires, the data collecting circuit assembly, the data converting circuit and the computer. The invention has fast storing performance, timely monitoring and stable judging.

Description

Technical field: [0001] 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: [0002] 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 cannot be underestimated. According to relevant statistics, there have been more than 140 cable thermal safety accidents in various power plants in my country in the past 20 years, of which 75 occurred in 7 years from 1986 to 19...

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

[0005] 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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