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Actual current-carrying capacity calculating method of underground laid power distribution line cable

A technology for power distribution lines and underground laying, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve problems such as unsightly appearance, large space occupation, and impact on the safety of power systems.

Inactive Publication Date: 2019-03-19
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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Problems solved by technology

In the past, the distribution lines were all overhead, which took up a lot of space and were not beautiful, and were gradually replaced by underground laying.
[0003] Laying cables underground is convenient for installation, but it is not conducive to maintenance and inspection, and has a certain impact on the safety of the power system

Method used

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  • Actual current-carrying capacity calculating method of underground laid power distribution line cable

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Embodiment Construction

[0026] The specific implementation of a method for calculating the actual ampacity of cables for underground distribution lines of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the actual current carrying capacity calculation method of the underground laying distribution line cable of the present invention comprises the following steps:

[0028] Step (1): Collect the temperature T of the cable core through a temperature sensor 1 , ambient temperature T 2 , collecting the working voltage of the cable through a voltage sensor;

[0029] Step (2): Calculate the AC resistance value R of the cable according to the temperature signal of the cable core AC ;

[0030] Step (3): Calculate the loss factor λ of the cable metal sheath 1 ;

[0031] Step (4): Calculate the loss factor λ of the cable armor layer 2 ;

[0032] Step (5): Calculate the thermal insulation resistance value R of the c...

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Abstract

The invention provides an actual current-carrying capacity calculating method of an underground laid power distribution line cable. The actual current-carrying capacity calculating method comprises the following steps that 1, cable core temperature, environment temperature and working voltage are acquired; 2, an alternating-current resistance value of the cable is calculated; 3, a metal sheath loss factor of the cable is calculated; 4, an armor layer loss factor of the cable is calculated; 5, an insulating thermal resistance value of the cable, an inner protective layer thermal resistance value and an outer protective layer thermal resistance value are calculated; 6, a thermal resistance value of the cable is calculated; 7, the actual current-carrying capacity of the cable is calculated. By adopting the actual current-carrying capacity calculating method of the underground laid power distribution line cable, the actual current-carrying capacity of the cable is calculated according to parameters of the cable and acquired temperature and voltage information, appropriate working current is selected, and accordingly the reliability and security of the cable in work are improved.

Description

technical field [0001] The invention belongs to the technical field of cable ampacity calculation, and in particular relates to a method for calculating the actual ampacity of an underground power distribution line cable. Background technique [0002] With the continuous development of science and technology, people's living standards are getting higher and higher, and the demand for electricity is also increasing. In the past, the power distribution lines were all overhead, which took up a lot of space and were not beautiful, and were gradually replaced by underground laying. [0003] Laying cables underground is convenient for installation, but it is not conducive to maintenance and inspection, and has a certain impact on the safety of the power system. Therefore, it is necessary to take corresponding detection measures to effectively detect the working state of the cable. The calculation of the actual carrying capacity of the cables laid underground can better select th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G06F17/10
CPCG01R31/00G06F17/10
Inventor 黄霆张乐张敏
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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