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Calculation method of real-time current-carrying capacity of cable connector

A cable joint and flow calculation technology, applied in the field of double-layer iterative algorithm based on electromagnetic-thermal coupling, can solve problems such as less consideration of electromagnetic loss, metal conductivity, etc., and achieve the effect of improving accuracy, accurate calculation results, and accurate calculation structure

Inactive Publication Date: 2017-01-11
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] At present, when calculating the temperature field of the cable, the electromagnetic loss and the change of the metal conductivity with the temperature are rarely considered. In practice, in order to estimate the current carrying capacity of the cable more accurately through the temperature, these factors cannot be ignored.

Method used

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  • Calculation method of real-time current-carrying capacity of cable connector
  • Calculation method of real-time current-carrying capacity of cable connector
  • Calculation method of real-time current-carrying capacity of cable connector

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Embodiment Construction

[0027] see figure 1 , taking the 8.7 / 15kV YJV 1×400 XLPE power cable cold-shrinkable straight-through joint as an example, a three-dimensional model of the cable joint was built in COMSOL; and the tetrahedron element was used to mesh the cable joint model. After division Participate in the schematic diagram of the grid division figure 2 . In order to strengthen the convergence in the iterative calculation process and improve the calculation accuracy, the grid division adopts the division method of uneven grid division, that is, the area where the temperature gradient of the model changes greatly, such as the conductor and the shielding layer, is divided into dense grids, and other The area is appropriately enlarged.

[0028] see image 3 , according to the flow chart, firstly by the initial ambient temperature T(0) and the formula Calculate the electrical conductivity of the conductor and the copper material of the shielding layer separately (σ represents the conductivit...

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Abstract

The invention discloses a calculation method of a real-time current-carrying capacity of a cable connector. The calculation method comprises: firstly, carrying out cable connector modeling in COMSOL; subdividing a model by utilizing tetrahedron non-uniform subdivision; furthermore, carrying out simulation calculation on the model by utilizing an electromagnetic-thermal coupling double-layer iterative algorithm; obtaining temperature distribution of a cable when considering influences, caused by temperature, on the electric conductivity of a cable conductor; simulating the temperature distribution of the cable under different current-carrying capacities; finally, backstepping the size of the current-carrying capacity of the cable at the moment by applying a current-carrying capacity calculation formula.

Description

technical field [0001] The invention relates to a method for inverting the actual carrying capacity of a cable according to the temperature of the cable, in particular to a double-layer iterative algorithm based on electromagnetic-thermal coupling. Background technique [0002] With the wide application of high-voltage power cables in the process of urban power grid transformation in my country, the number of intermediate joints used to connect two sections of cables has also increased significantly. However, many years of operating experience in power systems have shown that due to irregularities in the manufacture of cable joints or harsh laying environments, the internal contact resistance is often too large. Cases of cable disconnection, short circuit, explosion and even major fire accidents are not uncommon. Therefore, an effective method is needed to monitor the ampacity and temperature of the cable. [0003] The principle of detecting cable ampacity through temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23Y02E60/00
Inventor 李巍巍刘凤莲张海星陈洪波杨帆方欣吴天宝张宗喜王锐白欢马啟潇罗杨茜玥
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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