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A method for local overheating risk identification of distribution network cable lines

A cable line and identification method technology, which is applied in the field of local overheating risk identification of distribution network cable lines, can solve problems such as insulation aging shortening life, insulation medium strength decline, fire, etc., and achieves simple calculation, good practicability, and easy operation Effect

Active Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology

With the development of the economy, the power load continues to increase, and the operating environment of the power cable is becoming more and more complex. When the temperature of the cable in operation exceeds the specified value, the strength of the insulation medium inside the cable line will decrease, and the light one will cause insulation aging and shorten the life. In severe cases, the insulating material will be melted, causing a metal short circuit and causing a fire

Method used

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  • A method for local overheating risk identification of distribution network cable lines
  • A method for local overheating risk identification of distribution network cable lines
  • A method for local overheating risk identification of distribution network cable lines

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Embodiment Construction

[0057] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] The invention provides a method for overheating risk identification of distribution network cable lines, which is to obtain the A, B, and C three-phase voltage and current information at the head and end switches of the distribution network cable line in the historical time period before the current moment, and calculate the cable line The real-time impedance average value in this time period is used to mine the fluctuation law of the real-time impedance average value of the cable line in this time period, and according to the distribution network overheat risk identification rules, the local overheat risk identification of the distribution network cable line is carried out.

[0059] The flow of the distribution network cable overheating risk identification method provided by the present invention is as follows: f...

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Abstract

The invention relates to the technical field of power distribution network risk analyzing and controlling, in particular to a method for identifying power distribution network cable line local overheating risks. The method comprises the step of acquiring A, B and C three-phase voltage and current information at a head end switch position and a tail end switch position at present and a historical time range of a power distribution network cable line, the step of calculating a real-time impedance mean value of the cable line in the time range, the step of finding the fluctuation law of the real-time impedance mean value of the cable line in the time range, and the step of identifying the power distribution network cable line local overheating risks according to the impedance judgment criterion and the correlation relation between impedance change and cable line temperature rising. According to the method, the power distribution network cable line local overheating risk identification can be effectively achieved. The method has the advantages that practicability is good, and calculation and operation are easy. References are provided for power grid operating personnel to operate and maintain the cable line and self-healing control of the cable line.

Description

technical field [0001] The invention relates to the technical field of distribution network risk analysis and control, in particular to a method for identifying local overheating risks of distribution network cable lines. Background technique [0002] At present, the proportion of power cables in the urban distribution network is increasing, and it has become an indispensable power transmission and distribution equipment. With the development of the economy, the power load continues to increase, and the operating environment of the power cable is becoming more and more complex. When the temperature of the cable in operation exceeds the specified value, the strength of the insulation medium inside the cable line will decrease, and the light one will cause insulation aging and shorten the life. In severe cases, the insulating material will melt, causing a metal short circuit and causing a fire. Therefore, in order to more accurately and effectively judge whether there is over...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCY04S10/54Y04S10/50
Inventor 盛万兴宋晓辉张瑜贾东梨
Owner STATE GRID CORP OF CHINA
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