Method and system for measuring cable load carrying capacity
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A technology of cable load and measurement method, applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve the problem of large error of load carrying capacity data and so on
Inactive Publication Date: 2015-03-25
GUANGZHOU POWER SUPPLY CO LTD +1
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[0004] Based on this, it is necessary to provide a cable load ampacity measurement method that can accurately measure the cable load ampacity for the problem of large
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no. 1 example
[0023] see figure 1 , is the flow chart of the first embodiment of the method for measuring the cable load ampacity of the present invention;
[0024] Step S101: Measure the air temperature in the cable duct and the temperature of the cable conductor to obtain the measured value of the air temperature and the temperature of the cable conductor;
[0025] Specifically, an automatic temperature detector can be used to measure the air temperature in the cable duct and the temperature of the cable conductor, so as to obtain the measured value of the air temperature and the temperature of the cable conductor.
[0026] Step S102: Obtain the relevant parameters of the cable, including the first part of the parameters, the second part of the parameters, and the third part of the parameters; the first part of the parameters include the dielectric loss of the cable insulation layer, the thermal resistance of the cable outer sheath, the thermal resistance of the coal around the cable, Th...
no. 2 example
[0043] In order to further illustrate how the measuring method of cable load ampacity of the present invention is realized, the present invention is applied to cables as an example below for illustration; please refer to figure 2 , is the flow chart of the second embodiment of the method for measuring the cable load ampacity of the present invention;
[0044] Step 201: Measure the air temperature in the three-core cable duct and the cable conductor temperature to obtain the air temperature measurement value θ 0 And the cable conductor temperature value θ C ;
[0045] Step 202: Obtain relevant parameters of the three-core cable;
[0046] Specifically, the relevant parameters include the dielectric loss W of the cable insulation layer d , Cable insulation thermal resistance T 1 , Cable inner lining thermal resistance T 2 , Cable outer sheath thermal resistance T 3 , Coal thermal resistance T around the cable 4 , the AC resistance per unit length of the cable R, the ratio...
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Abstract
The invention provides a method and system for measuring cable load carrying capacity. The method comprises the steps that the air temperature and the temperature of a cable conductor in a cable pipeline are measured to obtain an air temperature measured value and a cable conductor temperature value; relevant parameters of a cable are obtained; the cable load carrying capacity is determined according to the air temperature measured value, the cable conductor temperature value and the relevant parameters of the cable; an average air temperature verification value in the cable pipeline is determined according to the cable load carrying capacity and the relevant parameters of the cable; an absolute value of a difference of the air temperature measured value and the average air temperature verification value is compared with a preset control error value, if the absolute value is smaller than the preset control error value, the cable carrying capacity is taken as final cable load carrying capacity; otherwise, the average air temperature verification value is taken as a new air temperature measured value, and the steps for determining the air temperature measured value are returned to. By the aid of the scheme, the cable load carrying capacity can be measured accurately, and the process is simple and convenient.
Description
technical field [0001] The invention relates to the technical field of cable operation data measurement, in particular to a method and system for measuring cable load ampacity. Background technique [0002] At present, cables are widely used in urban power grids because of their low investment in pipe laying, small footprint, and large capacity. Among them, the accurate calculation of the load ampacity of the cable is of great significance to the design of the power cable and the operation of the power system, which is usually reflected in: the power design department selects the cable according to the ampacity of the cable and the line Design, while the power operation department controls the load of the cable line according to the cable ampacity. Therefore, the calculation method of the cable ampacity plays an important role in the operation of the entire power system. [0003] However, the existing cable load ampacity measurement method is mainly calculated by the IEC (I...
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