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Power cable intermediate joint temperature calculating method

A technology for intermediate joints and power cables, applied to thermometers, thermometers using electric/magnetic elements that are directly sensitive to heat, and electric devices, etc., can solve problems such as the inability to calculate the temperature of intermediate joints, and improve calculation accuracy and accuracy Sexuality, easy real-time monitoring, avoiding the effect of on-site measurement

Active Publication Date: 2016-01-06
POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the IEC60287 standard, only the body conductor temperature of the cable can be calculated, and the intermediate joint temperature cannot be calculated.

Method used

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  • Power cable intermediate joint temperature calculating method
  • Power cable intermediate joint temperature calculating method
  • Power cable intermediate joint temperature calculating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] see figure 2 , figure 2 A sectional view of the field cable loop and a schematic diagram of the installation of the field temperature sensor in this embodiment are shown. The test cable is a single single-core XLPE cable (hereinafter referred to as XLPE cable), which is laid in a tunnel. The tunnel is a left-right symmetrical structure with a total of eight floors: the first and second floors are 220kV cables, the third to fifth floors are 110kV cables, the sixth to eighth floors are 10kV cables, and the fourth floor is an intermediate joint. The cable in the intermediate joint is an aluminum conductor , the remaining layers of cables are copper conductors, and the ambient temperature is 14.1°C.

[0074] Refer to Table 1 for the dimensions and specifications of the three- to five-layer cables.

[0075]

[0076] Table 13 ~ 5-layer cable size specification table

[0077] During the on-site measurement, temperature sensors 1 to 9 were installed on the skins of 110...

Embodiment 2

[0177] 1. Basic conditions

[0178] 1. Cable structure

[0179] ZC-YJLW02-Z127 / 2201×1600mm 2 Cable structure parameters

[0180]

[0181] 2. Operating status

[0182] Line type: three-phase alternating current

[0183] Voltage level: 220(kV)

[0184] Frequency: 50(Hz)

[0185] 1 circuit in total

[0186] The current loop is the first loop

[0187] 3. Cable laying method and environmental conditions

[0188] Laying method: tunnel laying

[0189] Medium temperature: 25(℃)

[0190] no direct sunlight

[0191] 4. Cable arrangement, phase, grounding method, location information

[0192] Arrangement: triangular arrangement

[0193] Phase: 0 (degrees), 120 (degrees), 240 (degrees)

[0194] Grounding method: cross interconnection

[0195] 2. Calculation of cable rated current carrying capacity

[0196] According to the cable composition, the material and geometric properties of each component unit of the cable, consult the IEC60287 standard to obtain the relevant par...

Embodiment 3

[0299] The difference between this embodiment and Embodiment 2 is: the cable laying method is pipe laying, the correction coefficient k=1.24, and the obtained: θ 1 =20.1°C, θ 2 = 17.8°C.

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Abstract

The invention discloses a power cable intermediate joint temperature calculating method, and belongs to the technical field of cable monitoring. The method comprises the following steps: A, consulting an IEC60287 standard, obtaining correlation parameters needed for calculating the current-carrying capacity of a cable, a current-carrying capacity load current value I3 of the load, a body skin temperature measuring value theta 2' of the cable, and an ambient temperature theta 0; B, obtaining a correction coefficient k, and obtaining a correction formula; C, according to correlation parameters, introducing the I3 into the correction formula, and inversely calculating a conductor temperature rise delta theta higher than the ambient temperature; D, according to the theta 2' and the delta theta, solving a body conductor temperature theta1' of the cable; and E, according to the ambient temperature theta 0 and the body conductor temperature theta 1', solving a joint skin temperature theta 2 and a joint conductor temperature theta 1 by use of a joint temperature calculation formula. According to the invention, the correction coefficient k is introduced so that the precision of calculating the current-carrying capacity of the cable by means of the IEC 60287 standard is improved. The intermediate joint temperature calculation method is also brought forward, and the method can accurately calculate the joint conductor temperature and the joint skin temperature, facilitates real-time monitoring of the intermediate joint and well supplements the IEC 60287 standard.

Description

technical field [0001] The invention relates to a method for calculating the temperature of an intermediate joint of a power cable, which belongs to the technical field of cable monitoring. Background technique [0002] With the rapid growth of power consumption and the progress of urban network transformation, the number of high-voltage cables in the power grid is increasing, and the reasonable operation of power cables has become the guarantee for the safe and economical operation of the power grid. The cable constituent material is divided into two parts: one is the conductor, and the other is the insulator. The function of the conductor is to conduct current, so the conductor will generate heat, and the greater the current, the more severe the heat. The heat generated by the conductor is proportional to the square of the current. The insulator itself will not generate heat, but the insulator is wrapped outside the conductor, and the heat generated by the conductor will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/00
Inventor 刘哲王炜李占岭
Owner POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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