Method for monitoring current-carrying capacity of power cable

A flow monitoring and power cable technology, applied in the field of power system monitoring, can solve problems such as uncertain equipment health status, inability to measure surge product effect, and failure to comprehensively collect voltage and calorific value, etc., to achieve the effect of improving accuracy

Active Publication Date: 2012-11-07
上海森首科技股份有限公司
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Problems solved by technology

[0005] The existing technology does not comprehensively collect voltage and current data to analyze the calorific value of the cable. Therefore, there are a large number of uncertain equipment health status; at the same time, there are also a large number of inte

Method used

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  • Method for monitoring current-carrying capacity of power cable
  • Method for monitoring current-carrying capacity of power cable
  • Method for monitoring current-carrying capacity of power cable

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Embodiment

[0032] Such as figure 1 Shown, a kind of power cable ampacity monitoring method, this method comprises the following steps:

[0033] Step 1: The sensor obtains the cable temperature monitoring data, equipment temperature data, site environment temperature data, voltage data, current data, uneven resistance data, skin effect data, dielectric loss data and uneven thermal resistance distribution data, and sends them to the processing device;

[0034] Step 2: The processor establishes based on the equipment temperature data, field environment temperature data, voltage data, current data, uneven resistance data, skin effect data, dielectric loss data and uneven thermal resistance distribution data combined with the basic data of cable engineering Heat balance finite element model. Among them, the basic data of cable engineering includes cable internal structure parameters, structural dimensions, cable material parameters and material correlation coefficients, while the data of th...

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Abstract

The invention relates to a method for monitoring the current-carrying capacity of a power cable, which comprises the following steps that: 1, a sensor sends acquired data to a processor; 2, according to the data, the processor combines cable engineering basic data to establish a heat balance finite element model; 3, a comparison module of the processor compares data of the heat balance finite element model and data of a cable temperature field model, if the data difference is greater than a threshold value, the step 4 is executed, and if the data difference is less than the threshold value, the step 5 is executed; 4, after the heat balance finite element model is corrected by a model correction module of the processor, the step 3 is executed again; and 5, the comparison module outputs the data of the heat balance finite element model and sends the data to a mode identification module to carry out dynamic mode identification and simultaneously, the current-carrying capacity analysis, the trend analysis, the surge summation effect analysis, the early warning and warning identification and the optimization of a power transmission and distribution scheme are carried out. Compared with the prior art, the method has the advantages of high measurement accuracy, more measurement data and the like.

Description

technical field [0001] The invention relates to a method for monitoring a power system, in particular to a method for monitoring the ampacity of a power cable. Background technique [0002] One of the important reasons for the cable failure of the power grid is the lack of effective online monitoring of the cable system. With the development of power grid transformation and construction work, the rate of urban underground cables continues to increase, and the use of power cables has increased significantly, making the monitoring, management, and maintenance of power cables more and more important. At the same time, with the load of power cables increased reliance on monitoring. The current carrying capacity of the power cable directly reflects the operating temperature of the cable conductor, and the operating conductor temperature is an important parameter of the cable. Generally, when the cable is running under the rated load, the core conductor temperature at this time ...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01K13/00
Inventor 曹春耕吴向平黄展峰
Owner 上海森首科技股份有限公司
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