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Cable aging treatment and monitoring method and device

A monitoring device and cable technology, which is applied to measuring devices, insulation/armored cable repair equipment, and electrical measurement. It can solve the problems of no partial repair, consumption of repair fluid, repair failure, etc., and achieves improved repair precision and improved repair. Efficiency, the effect of improving repair efficiency

Pending Publication Date: 2019-08-02
GAUSS ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Mainly for cables with severe overall aging. For local aging, it is impossible to judge whether there is local aging, or the location of local aging, which leads to blind aging repair and consumes a lot of repairing fluid
[0005] 2) The method of nano-filling slowly penetrates into the cable insulation layer under pressure. If the cable is 1 km, the penetration time may be as long as 8 hours to 12 hours, and even some cables with intermediate joints may have nano-liquids that cannot pass through, resulting in Cases where repair fails
[0006] 3) The current aging repair cannot track the repair status in real time during the repair process, and can only compare the dielectric loss or leakage current before and after the repair
Since the compared data is only for the overall insulation parameters of the cable, there is no technical means to obtain the effect of partial repair, such as the repair situation of a certain area

Method used

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  • Cable aging treatment and monitoring method and device
  • Cable aging treatment and monitoring method and device
  • Cable aging treatment and monitoring method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] to combine figure 1 , a cable aging management monitoring device, said device comprising:

[0050] central controller;

[0051] monitoring unit;

[0052] The cable under test;

[0053] The monitoring unit includes a signal acquisition system, a DDS signal generator, and a power amplifier;

[0054] The central controller is respectively connected with the signal acquisition system and the DDS signal generator; the DDS signal generator is connected with the power amplifier, and the tested cable is respectively connected with the signal acquisition system and the power amplifier.

[0055] The tested cable is assembled from the tested cable and a fixed-length standard cable. As a part of the tested cable, the standard cable has been calibrated in advance and can be considered as a stable constant, that is, it has a stable dielectric constant and length;

[0056] Specifically, the cable to be tested is connected in series with the standard cable, such as image 3 shown. ...

Embodiment 2

[0065] combine figure 2 , a cable aging management device, said device comprising:

[0066] Central controller, tested cable;

[0067] A monitoring unit, including a signal acquisition system, a DDS signal generator, and a power amplifier connected in sequence;

[0068] High frequency heating element;

[0069] Inflatable unit: contains relays and compressors connected in sequence;

[0070] Restoration liquid injection unit: includes repair liquid injection pumps, injection valves, flow monitors, and multi-phase synchronous valves connected in sequence;

[0071] The central controller is respectively connected to the monitoring unit and the inflation unit; the tested cable is respectively connected to the monitoring unit, the high-frequency heating element, and the repair liquid injection unit;

[0072] The power amplifier is connected with the high frequency heating element.

[0073] It should be noted that a solution is provided for the problem of slow penetration of th...

Embodiment 3

[0086] A method for cable aging management and monitoring, the method includes aging assessment, capable of evaluating the aging situation of cables, including the following steps:

[0087] S1: Assembling the cable to be tested with a fixed-length standard cable to form a tested cable, the standard cable has a stable dielectric constant and length;

[0088] S2: The output signal source of the DDS signal generator passes through the power amplifier and then passes through the tested cable;

[0089] S3: Obtain the calculated length L1 of the tested cable through the frequency domain analysis method of impedance spectrum or phase spectrum;

[0090] S4: Comparing the calculated length L1 of the tested cable with the actual length L0 of the tested cable, judge whether the cable is aging or judge the degree of cable aging: when L1=L0, the aging control cable does not appear aging phenomenon, when L1< At L0, the aging treatment cable has already experienced aging phenomenon, and the...

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Abstract

The invention provides a cable aging treatment and monitoring method, which is characterized by assembling a cable to be measured and a standard cable with fixed length into a tested cable, wherein the standard cable has a stable dielectric constant; outputting a signal source through a DDS signal generator, wherein the signal source passes through a power amplifier and then, passes through the tested cable; obtaining calculated length L1 of the tested cable through a frequency domain analysis method of impedance spectrum or phase spectrum or a time-domain reflectometry method containing powerenergy; and comparing the calculated length L1 of the tested cable and actual length is L0 of the tested cable. With the help of the standard cable and cable length calculation, the method not only can evaluate the aging condition of the cable to be measured, but also can monitor the aging repair process, and is a very reliable and economical method.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and relates to a method and a device for cable aging control and monitoring. Background technique [0002] Insulated power equipment, especially insulated cables, are widely used in distribution networks. A slight carelessness in the construction process of cables can cause scratches or cracks in the insulation layer, causing the insulated cables to be damp; It has the effect of damp, and the cable runs under high load conditions for a long time, which leads to premature aging of the cable. Once moisture or water enters the cable, it will penetrate longitudinally from the gap between the outer copper tape shield of the cable insulation and the gap between the conductors. In severe cases, the test results will not meet the standard and the power transmission will not be able to be delivered as scheduled. In light cases, under the action of water vapor under the action of a strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/00G01R23/16H02G1/16
CPCG01R31/1272G01R31/003G01R23/16H02G1/16
Inventor 张建尹娟王天兵李军
Owner GAUSS ELECTRONICS TECH
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