Cable conductor temperature estimation method based on distributed optical fiber online temperature measurement system
A technology of distributed optical fibers and cable conductors, which is applied in the directions of thermometers, thermometers, and optical radiation measurements with physical/chemical changes, and can solve the problems of insufficient accuracy, lag, and being easily affected by ambient temperature and measurement methods. The effect of high precision and practicality
Pending Publication Date: 2021-07-16
HONGTA TOBACCO GRP
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[0003] However, the current temperature measurement system has the following problems: First, most temperature measurement probes are indirect measurements, which are easily affected by the ambient temperature and measurement methods, and the accuracy is not high enough. Second, due to the existence of the thermal time constant of the cable, when the load current changes , it takes a while for the temperature of the cable conductor to reach a stable state, and the temperature rise of the cable skin also lags behind the temperature rise of the conductor, so the comprehensive conductor temperature calculation method considering the load current change, ambient temperature and cable skin temperature has strong practicability
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[0037] In order to facilitate those skilled in the art to understand and realize the present invention, the technical solution of the present invention is now further described in conjunction with the drawings and specific embodiments.
[0038] As shown in the figure, this embodiment uses the testo880 infrared thermal imager to measure the cable conductor at the 110kV cross-linked polyethylene cable joint of the incoming line of the substation, and records the temperature data every 1 minute, and the ambient temperature measured by the thermometer of the substation, The cable load current of the substation metering system and the cable skin temperature measured by the distributed optical fiber online temperature measurement system together constitute the data for cable conductor temperature prediction. Data collection according to production characteristics: 1) Tobacco rebaking workshop runs from November to early May of the next year, during which time the load of the entire f...
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The invention provides a cable conductor temperature estimation method based on a distributed optical fiber online temperature measurement system. The estimation method comprises the following steps: step 1, constructing a model data sequence; step 2, constructing a cable conductor temperature prediction model according to the data sequence in the step 1; and step 3, inputting the load current data, the environment temperature data and the cable skin temperature data of a test set into the model to estimate the temperature of the cable conductor. According to the method provided by the invention, the solution of a temperature transmission analytic expression between the cable conductor and the skin is avoided, the influence of the structural physical parameters of the cable is avoided, and the method has relatively high precision and practicability.
Description
technical field [0001] The invention relates to the technical field of real-time estimation of cable conductor temperature, and more specifically relates to a method for estimating the temperature of a cable conductor. Background technique [0002] Cables are widely used in the fields of power transmission and power supply and distribution. The conductor temperature of power cables during operation is an important basis for evaluating their current carrying capacity and safety. For this reason, many power companies and users have introduced optical fiber online temperature measurement systems in their substations to monitor the operating temperature of cables in real time. [0003] However, the current temperature measurement system has the following problems: First, most temperature measurement probes are indirect measurements, which are easily affected by the ambient temperature and measurement methods, and the accuracy is not high enough. Second, due to the existence of t...
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IPC IPC(8): G01K11/32G01J5/00G06N3/04G06N3/08
CPCG01K11/32G01J5/0096G06N3/08G06N3/045
Inventor 王洪帅段剑华郭文斌施绍兴张薇张如品朱力张宗兴
Owner HONGTA TOBACCO GRP