Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy

A technology for cross-linked polyethylene and insulated cables, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inaccurate aging life of cross-linked polyethylene insulated cables, aging failure of cross-linked polyethylene insulation, etc., and achieve the reduction of test Effects of Result Error, Accuracy Improvement, and Evaluation Error Reduction

Inactive Publication Date: 2016-08-17
FAR EAST CABLE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional cable life evaluation method is to establish the Arrhenius model through the accelerated thermal aging test, and extrapolate the aging life time at the actual operating temperature of the cable based on the aging life measured at a higher temperature, but this accelerated aging test Only the influence of "heat" factors on the aging process of cable insulation is considered, and cable insulation will be affected by factors such as heat, electricity, stress, chemicals, moistur

Method used

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  • Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy
  • Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy
  • Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy

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Embodiment 1

[0032] See figure 1 , figure 2 with image 3 , the aging life evaluation system of cross-linked polyethylene insulated cables for smart energy in this embodiment includes an AC power supply 1, a line resistance 2, a high temperature resistant power supply connection line 3 and an air aging oven 4; a sample holder 41 is arranged in the air aging oven 4; The sample holder 41 includes a slot 41-1 and a sliding fixture 41-2 slidably fixed in the slot 41-1. Epoxy resin shields are arranged around the inner wall of the air aging oven 4 .

[0033] The aging life assessment method includes the following steps:

[0034] Step 1: For the single-core cable sample to be evaluated (structure such as image 3 shown) for pretreatment, peel off the outer sheath at one end of the cable, adjust the sliding clamp according to the outer diameter of the cable sample, fix the processed cable sample on the sample holder 41, and fix 3 samples to be evaluated on each sample holder 41 Cable sample...

Embodiment 2

[0039] See Figure 4 with Figure 5 , a method of this embodiment is basically the same as that of embodiment 1, the difference is: as Figure 5 As shown, the cable sample to be evaluated is a three-core cable.

[0040] In Step 1, two cable samples to be evaluated are fixed on each sample holder 41 .

[0041] In step 2, metal copper wires are used in advance to connect the three conductors 5 of each cable sample to be evaluated together, and then the AC power supply is connected, and any metal shielding layer on the three insulated cores of the cable sample to be evaluated is selected to be grounded. The three conductors 5 and the metal shielding layer 7 are respectively connected in parallel by using high temperature resistant connecting wires 3 .

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Abstract

The invention discloses a method and a system for evaluating the ageing life of a crosslinked polyethylene insulating cable for smart energy. The method comprises the following steps: accelerating a thermal ageing life estimation test, and introducing an electrical ageing factor in the thermal ageing life estimation test. According to the method and the system, electricity is introduced on the basis of a single factor thermal ageing estimation test, that is, the thermal ageing test is accelerated on a cable test specimen, and meanwhile a rated working voltage is applied to an insulating layer of the cable test specimen, so that the simulated ageing test conditions are in better accordance with an ageing process in a practical operating process of cable insulation; therefore, the evaluated life value which is more close to the actual life of the cable can be obtained; the method and the system have more guidance meaning on the transformation and replacement of a cable project engineering.

Description

technical field [0001] The invention relates to a method and system for evaluating the aging life of cross-linked polyethylene insulated cables for smart energy. Background technique [0002] At present, the service life of cables stipulated in the industry is only an evaluation value. If the evaluation value is small, it will cause premature cable replacement and waste capital. If the evaluation value is too large, it will cause accidents due to failure to replace cables in time, posing safety hazards. . Therefore, it is of great economic benefit and practical significance to accurately evaluate the service life of cables. [0003] The traditional cable life evaluation method is to establish the Arrhenius model through the accelerated thermal aging test, and extrapolate the aging life time at the actual operating temperature of the cable based on the aging life measured at a higher temperature, but this accelerated aging test Only the influence of "heat" factors on the ag...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N3/00
CPCG01N17/00G01N3/00
Inventor 陈东陆正荣张鹏周锋兰阳灿路文贤查波
Owner FAR EAST CABLE
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