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Testing method for aging factor of 110 kV cross-linked cable

A technology of cross-linked cables and aging factors, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of popularization and application restrictions, relatively large influence of cable length, and too long test time requirements, so as to prevent material waste , to achieve the effect of reliable grid materials and test results

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The recovery voltage method mainly has two disadvantages that can be avoided: one is that it is greatly affected by the length of the cable, and the second is that the test time is too long; In the process, it needs to be compared with the core cable. Another thing is that this method cannot distinguish the concentrated defects and distributed defects of the cable. These shortcomings have caused great restrictions on the promotion and application of these two methods.
However, the evaluation of 110kV cross-linked cables by isothermal relaxation current method has not been reported yet.

Method used

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  • Testing method for aging factor of 110 kV cross-linked cable
  • Testing method for aging factor of 110 kV cross-linked cable
  • Testing method for aging factor of 110 kV cross-linked cable

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Embodiment

[0047] like figure 1 As shown, the test method of the aging factor of 110kV XLPE cable includes the following steps:

[0048] (1) Pretreatment of the cable:

[0049] Strip the outer shielding layer at both ends of the cable, and clean the dirt left during the stripping process with absolute ethanol.

[0050] (2) Electromagnetic shielding at both ends of the cable is carried out with a retractable aluminum foil bellows:

[0051] (3) Polarize the cable: insulate one end of the cable reliably, connect the conductor at the other end to the positive pole of the high-voltage DC power supply for polarization, and ground the outer metal shield. The polarization time is 1800s.

[0052] (4) Short-circuit the cable instantaneously;

[0053] (5) Using the isothermal relaxation current method to test the polarization current I generated by the interface between amorphous and crystal 2 and the polarization current I generated by metal salts and hydrated ions in the interface due to agin...

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Abstract

The invention discloses a testing method for an aging factor of a 110 kV cross-linked cable. The testing method comprises the following steps of: (1) pretreating the cable; (2) performing electromagnetic shielding on the two ends of the cable; (3) polarizing the cable; (4) performing transient short-circuiting on the cable; (5) testing polarization current I2 generated by an amorphous and crystal interface and polarization current I3 generated by metal salt and hydrated ions in the interface caused by aging by using a constant temperature relaxing current method and recording values of I2 and I3 of different moments t; (6) calculating time constants tau 2 and tau 3 corresponding to the polarization current I2 and I3 respectively; and (7) calculating the aging factor according to a formula. According to the method provided by the invention, residual life of the cable can be obtained under the condition of not referring to the operation history of a laid cable, the test result is more reliable, and more accurate guidance is provided for reconstruction work of an urban power grid.

Description

technical field [0001] The invention relates to the field of cable testing, in particular to a testing method for the aging factor of 110kV cross-linked cables. Background technique [0002] The research on the remaining life of high-voltage XLPE cables has always been the focus of people's attention. In my country, cross-linked polyethylene insulated power cables have been used for many years, and the number of 110kV cross-linked cables with a running time of more than 10 years has also been large. Taking Guangzhou as an example, the length of 110kV cross-linked cables with a running time of more than 10 years There are hundreds of kilometers, and these cables come from different manufacturers and different laying conditions and operating conditions, etc., the current quality and life status are also different. Accurately knowing the quality status of these cables is of great significance to the safe operation of the power grid and future power grid planning, but it is diff...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 刘刚周凡黄云胡倩楠
Owner SOUTH CHINA UNIV OF TECH
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