Method and system for determining current-carrying capacity of three-core cable laid in cable duct

A three-core cable, the technology of determining the method, applied in the field of electric power, can solve problems such as poor heat dissipation conditions

Active Publication Date: 2013-04-17
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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Problems solved by technology

However, formula (1) is a calculation formula in the case of free air without direct sunlight. Since the heat dissipation conditions of cables in cable trenches are obviously worse than those in free air, the calculation of the ampacity of cables in cable trenches based on formula (1) is obvious. will be higher than the test results

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  • Method and system for determining current-carrying capacity of three-core cable laid in cable duct
  • Method and system for determining current-carrying capacity of three-core cable laid in cable duct
  • Method and system for determining current-carrying capacity of three-core cable laid in cable duct

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0029] As mentioned in the background technology section, the ampacity calculated by formula (1) will be significantly higher than its real value, because the main difference between cable trench laying and free air laying is that the medium around the cable is different (one is a semi-closed place placed in the soil Cable trench, one is free air), and the medium around the cable will obviously affect the thermal resistance of the medium around the cable per unit length, and then affect the current carrying capacity I of the cable, and the thermal resistance of the medium around the cable per unit length is mainly related to the temperature in the cable trench. In order to calculate the ampacity of the three-core cable laid in the cable trench as accurately as possible, the present invention solves...

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Abstract

The invention provides a method and a system for determining the current-carrying capacity of a three-core cable laid in a cable duct. The method comprises the following steps: acquiring related parameters of the cable duct; determining integrated environment temperature and cable duct temperature rise; determining cable duct temperature according to the integrated environment temperature and the cable duct temperature rise; correcting thermal resistance of media around the cable in unit length according to the cable duct temperature; and determining the current-carrying capacity of the cable according to the corrected thermal resistance of the media around the cable in the unit length and the related parameters of the cable. The method and the system effectively solve a problem that the current-carrying capacity of the cable in the cable duct is calculated to be obviously high in the prior art, and can accurately determine the current-carrying capacity of the cable laid in the cable duct.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for determining the ampacity of a three-core cable laid in a cable trench. Background technique [0002] Compared with laying methods such as direct burial, pipe penetration and cable tunnel, the cable trench laying method has the advantages of low investment, less land occupation, flexible direction and can accommodate more cables, increasing the number of cable loops, no need for manholes, and convenient cable entry and exit. It is widely used in 10kV distribution cables. [0003] Ampacity is one of the most important parameters of cable lines, and its accurate calculation is of great significance to the design and operation of power cables. The power design department selects cables and designs cable lines according to the ampacity, and the operation department controls the load of the cable lines according to the ampacity. [0004] The calculatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 余兆荣牛海清孙广慧张群峰赵继光张尧麦灿波陈燕萍李光明韩存赖景飞
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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