A method for determining the temperature of a cable conductor
A cable conductor and determination method technology, applied in thermometers, thermometers using electrical/magnetic components directly sensitive to heat, using electrical devices, etc. Set the temperature measurement results and other issues to achieve the effect of simple principle and fast calculation
Active Publication Date: 2017-02-15
STATE GRID CORP OF CHINA +1
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[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
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[0049] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0050] The overall flow chart of estimating the cable conductor temperature based on the cable resistance provided by the present invention is as follows: figure 1 shown, including the following steps:
[0051] (1) Establish a quaternary linear regression model for the voltage, current, active power, reactive power and resistance at the beginning and end of the cable line:
[0052] Under normal circumstances, the voltage phase angle difference between the first and last ends of the cable line is not large, and the transverse component of the voltage drop can be ignored. It is approximately considered that the voltage loss is equal to the longitudinal component of the voltage drop. The expression is as follows:
[0053]
[0054] In the formula: P 0 , Q 0 Respectively, the active power and reactive power at the head ...
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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 a 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 city scale and the rapid development of economic construction, the urban cable rate has increased significantly, the voltage level of cable lines has continued to increase, and the transmission energy has continued to increase. The operation management, monitoring and maintenance of power cables have become more and more 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 range. Once overloaded, the conductor temperature will rise sharply, accelerating the aging of the insulation, causing the leakage current to increase and the temperature to continue to rise. High, it may cause insulation breakdown and even fir...
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IPC IPC(8): G01K7/16
Inventor 李建芳宋晓辉张瑜
Owner STATE GRID CORP OF CHINA