Underground power cable current-carrying capacity online prediction system and method

A technology of power cable and prediction method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problem of inability to accurately predict the current carrying capacity of cables online, and achieve the effect of safe and reliable operation.

Inactive Publication Date: 2012-09-12
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0004] The real-time ampacity of the cable is a physical quantity closely related to the cable structure, the thermal conductivity of the surrounding soil, and the surface air. Neither of the above two methods can accurately predict the ampacity of the cable online.

Method used

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  • Underground power cable current-carrying capacity online prediction system and method
  • Underground power cable current-carrying capacity online prediction system and method
  • Underground power cable current-carrying capacity online prediction system and method

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Experimental program
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Embodiment Construction

[0043] The concrete steps of this embodiment are:

[0044] (1) First build an online prediction system for the current carrying capacity of underground power cables:

[0045] The underground power cable ampacity online prediction system is composed of a temperature sensor (1) for measuring air temperature, a wind speed sensor (2), a humidity sensor (3), a single-chip microcomputer system (4), and a dispatching host computer (6) of the power department ; The output ends of the temperature sensor (1), wind speed sensor (2), humidity sensor (3) are respectively connected to the corresponding input ends of the single-chip microcomputer system, and the single-chip microcomputer system is connected with the dispatching host ( 6) connected; the temperature sensor (1) and the wind speed sensor (2) are installed directly above the power cable, and the humidity sensor (3) is installed in the soil along the power cable;

[0046] (2) The specific steps of the online prediction method for...

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Abstract

The invention relates to an environment factor monitoring and finite element-based underground power cable current-carrying capacity online prediction system and an environment factor monitoring and finite element-based underground power cable current-carrying capacity online prediction method. The system consists of a temperature sensor used for measuring the air temperature, a wind speed sensor, a humidity sensor, a singlechip system and a scheduling host of a power department. The method comprises the step of predicting the current-carrying capacity of an underground power cable by combining temperature, wind speed, humidity and other data measured in real time with the calculation of a finite element temperature field. The system and the method have the advantages that: the system andthe method can accurately predict the current-carrying capacity of the underground power cable on line, so that the power department can develop the capacity of conveying electric energy to the greatest degree; meanwhile, the system and the method can avoid the resource waste phenomenon of wasting the talent on a petty job on the premise of guaranteeing safe and reliable operation.

Description

technical field [0001] The invention relates to an online prediction method for the ampacity of an underground power cable. Background technique [0002] Underground high-voltage power cables are the main form of urban power transmission and distribution lines. Due to their high installation costs and difficult maintenance, on the basis of ensuring their long-term safe and reliable operation, the current carrying capacity of high-voltage power cables should be reasonably determined to maximize Its ability to deliver electrical energy is of great importance to the power sector. [0003] At present, there are two methods for determining the ampacity of underground power cables. One is offline calculation, that is, according to the local soil properties and the highest temperature in the hottest month, according to IEC60287 or finite element calculation; the other is online calculation, through online Monitor the surface temperature of the cable, calculate the cable core tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 梁永春
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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