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Method for predicting corrosion life of transmission line hardware in coastal regions

A transmission line and life prediction technology, which is applied in the field of electric power engineering, can solve problems such as lack of power fittings, and achieve the effects of strong practicability, high accuracy, and fast time

Active Publication Date: 2013-05-08
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for predicting the corrosion life of power transmission line fittings in coastal areas, which can quickly and accurately predict the corrosion life of power fittings in coastal areas. Corrosion life of the region, so that timely measures can be taken to prevent the power failure and tripping of the transmission network caused by the disconnection fault of the transmission line

Method used

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  • Method for predicting corrosion life of transmission line hardware in coastal regions
  • Method for predicting corrosion life of transmission line hardware in coastal regions
  • Method for predicting corrosion life of transmission line hardware in coastal regions

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Determine the target of fittings for transmission lines in coastal areas to be predicted, take samples from fittings that have been replaced on the transmission line or take samples from fittings of the same type that have not appeared red rust for more than 8 months after leaving the factory, and use a wire cutting machine to remove samples from fittings Cut a 1cm×1cm square piece with a galvanized layer on one side of the surface;

[0022] (2) A copper wire is connected to the back side of the galvanized side of the sample piece cut out in step (1), and epoxy resin is used to connect the copper wire together with the side of the sample piece connected to the copper wire encapsulation. The copper wire is connected to the other end of one end of the sample piece as a terminal and protrudes from the epoxy resin and is made into a working electrode for electrochemical testing;

[0023] (3) After the epoxy resin used in step (2) to encapsulate the sample piece is cure...

Embodiment 2

[0036] Steps (1) to (4) are the same as in Example 1;

[0037] (5) Take 100 grams of analytically pure NaCl and 1,000 grams of deionized water with a resistivity above 18 MΩ·cm. Add the analytically pure NaCl to the deionized water gradually, so that the mass fraction of NaCl is equal to the standard salt spray test concentration of the analytically pure NaCl content of 50g / L±5g / L to prepare a simulated salt spray solution;

[0038] Steps (6) to (8) are the same as in Example 1;

[0039] (9) Obtain the average annual rainfall days τ of the location of the transmission line fittings in the coastal area to be predicted from the meteorological department described in step (4), the unit is day;

[0040] (10) Apply the following formula to calculate the mid- and long-term average annual corrosion depth rate V of the transmission line fittings in coastal areas to be predicted in step (1), in μm / year:

[0041] V = τ 365 ...

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Abstract

The invention discloses a method for predicting corrosion life of transmission line hardware in coastal regions. The method comprises the following steps: (1) sampling hardware replaced from a transmission line; (2) connecting a copper wire, and packaging an epoxy resin; (3) cleaning the outer surface of the sample; (4) calculating the annual average value of chlorine ion content in local rainwater; (5) preparing a simulated salt fog solution; (6) testing the sample in a three-electrode system electrolytic cell; (7) drawing a potentiodynamic polarization curve; (8) testing to obtain the simulated salt fog corrosion current density; (9) acquiring the annual average rainfall days; (10) calculating the medium / long-term annual average corrosion depth rate; (11) measuring a thickness average value of a galvanizing layer; and (12) acquiring the residual corrosion life of the galvanizing layer. According to the method, the traditional restriction is broken, and the galvanizing thickness on the surface of the hardware is measured, so that the corrosion rate and life of the transmission line hardware in coastal regions is evaluated, and rapidness and accuracy are realized and the practicality is high.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to a method for predicting the corrosion life of metal fittings of power transmission lines in coastal areas. Background technique [0002] The high-voltage transmission line is the carrier for transmitting current in the power grid, and it is mainly composed of towers, wires and fittings. Among them, fittings are indispensable metal accessories for connecting, fixing and supporting wires and towers, wires and insulators, and play an important role in transmitting mechanical loads, electrical loads or some kind of protection. The transmission line has been running in the open air for a long time, and it is generally plagued by corrosion problems. As the fittings of the connecting parts, due to the large number of corner gaps, the large tensile stress, and the vibration of the wires during operation, the contact parts are fretting and worn, resulting in...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N17/02
Inventor 陈军君李明胡波涛王军陈红冬
Owner STATE GRID HUNAN ELECTRIC POWER
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