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Cable conductor temperature determining method

A technology for determining the method of cable conductors, applied to thermometers, thermometers using electric/magnetic elements that are directly sensitive to heat, and using electrical devices, etc. Problems such as the influence of temperature measurement results

Active Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It is worth noting that the temperature measurement results of the cable outer sheath are easily affected by the external environment, such as: the temperature measured in a windy and windless environment will be different, which directly affects the accuracy of the conductor temperature calculation, the cable Structural and laying parameters also affect calculation results

Method used

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Embodiment Construction

[0049] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] The overall flow chart of the cable conductor temperature estimation based on the cable resistance provided by the present invention is as follows figure 1 Shown, including the following steps:

[0051] (1) Establish a four-element linear regression model of voltage, current, active power, reactive power and resistance at the head and end of the cable line:

[0052] Under normal circumstances, the voltage phase angle difference between the first and the end of the cable line is not large, and the horizontal component of the voltage drop can be ignored. It is approximated that the voltage loss is equal to the longitudinal component of the voltage drop. The expression is as follows:

[0053] ΔU = U 0 - U n = P n U n R X + Q n U n X X + ( P 0 U 0 - ...

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Abstract

The invention relates to the field of power system operation control technologies, and specifically relates to a cable conductor temperature determining method. The method comprises the following steps: (1) establishing a quarternary linear regression model of head and end voltage, current, active power, reactive power and resistance of a cable line; (2) determining the resistance of the cable line according to the quarternary linear regression model; (3) converting the resistance of the cable line into the resistance of a conductor of unit length; and (4) determining the temperature of a cable conductor. By adopting the method of the invention, the modeling of a complex heat transfer model or heat circuit model is avoided, measurement of the temperature of the outer sheath of the cable is not needed, and the impact of the external environment on the result of temperature calculation does not need to be considered. The method is based on a simple principle, is quick in calculation, and can provide a reference basis for overheat or overload risk identification and early warning.

Description

Technical field [0001] The invention relates to power system operation control technology, in particular to a method for determining the temperature of a cable conductor. Background technique [0002] With the expansion of the scale of cities and the rapid development of economic construction, the rate of urban cabling has increased significantly, the voltage level of cable lines has continued to increase, and the transmission energy has continued to increase. The operation, management, and monitoring and maintenance of power cables have become increasingly important. [0003] The temperature of the cable conductor is an important parameter of the cable. When the cable is running under the rated load, the conductor temperature is within the allowable value range. Once overloaded, the conductor temperature will rise sharply, accelerating the insulation aging, causing the leakage current to increase, and the temperature continues to rise High, it may cause insulation breakdown and ev...

Claims

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Application Information

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IPC IPC(8): G01K7/16
Inventor 李建芳宋晓辉张瑜
Owner STATE GRID CORP OF CHINA
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