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Method for simulating white crystalline rust on the ground wire when the ground wire of 500kv transmission line melts

A technology for ice melting of ground wires and power transmission lines, which can be used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., and can solve the problems of complex operation and danger.

Active Publication Date: 2018-02-02
GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is more complicated and dangerous to obtain the above-mentioned rust directly from the ground

Method used

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  • Method for simulating white crystalline rust on the ground wire when the ground wire of 500kv transmission line melts
  • Method for simulating white crystalline rust on the ground wire when the ground wire of 500kv transmission line melts
  • Method for simulating white crystalline rust on the ground wire when the ground wire of 500kv transmission line melts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] experiment material:

[0032] a. There are more than 80 steel strands GJ-80, each with a length of 1.2m;

[0033] b. Multiple pieces of parallel groove clamps (also called: CH clamps);

[0034] c. Acetic acid;

[0035] d. 1 pH tester;

[0036] e. 1 portable crimping pliers;

[0037] f. DC steady current source 30A 1 set, 100A 1 set;

[0038] g. One DC digital voltmeter.

[0039] 1. Obtain 6 sets of crimping units (see Table 1 below for specific crimping conditions), connect the 6 sets of crimping units in series and short-circuit with the DC steady current source to form a circuit.

[0040] Table 1 The crimping conditions of each group of crimping units

[0041]

[0042] Remark:

[0043] The above-mentioned "mold clearance" refers to: during the crimping process, the crimping dies are not clamped, and there is a gap between the crimping dies.

[0044] The above-mentioned "length after crimping" refers to the length after the crimping pliers and the conductor ...

Embodiment 2

[0069] experiment material:

[0070] a. There are more than 80 steel strands GJ-80, each with a length of 1.2m;

[0071] b. Multiple pieces of parallel trench clamps;

[0072] c. Mouth alkali;

[0073] d. 1 pH tester;

[0074] e. 1 portable crimping pliers;

[0075] f. DC steady current source 30A 1 set, 100A 1 set;

[0076] g. One DC digital voltmeter.

[0077] The biggest difference between this embodiment and Example 1 is that alkali is used to configure the alkaline solution, and in the electrification test, the alkaline solution is used to supply the clamp and its adjacent steel strands, and finally the clamp and its pressure are observed. Fewer white crystals appear at the end of the wire.

Embodiment 3

[0079] experiment material:

[0080] a. There are more than 80 steel strands GJ-80, each with a length of 1.2m;

[0081] b. Multiple pieces of parallel trench clamps;

[0082] c. hydrochloric acid;

[0083] d. 1 pH tester;

[0084] e. 1 portable crimping pliers;

[0085] f. AC transformer 1000A 1 set;

[0086] g. 1 AC digital voltmeter.

[0087] The biggest difference between this example and Example 1 is that an AC source is used for the energization test, and it is finally observed that there are fewer white crystals appearing at the contact parts between the clamp and the steel strand.

[0088] Summary of test results:

[0089] Comprehensively the test result of above-mentioned embodiment 1 to 3 can know:

[0090] 1. The effect of crimping quality on the resistance ratio before and after temperature rise:

[0091] The crimped clamp (clamp 1) has a resistance ratio of 0.30 before temperature rise and a resistance ratio of 0.31 after temperature rise;

[0092] The re...

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Abstract

The invention discloses a method for simulating ice melting of a ground wire of a 500kV power transmission line to generate white crystal rust. The method is characterized by comprising the following steps: step 1, preparing: obtaining a cable clamp and steel strands; pressing one cable clamp and the end parts of the two steel strands to form one group of pressing unit; and obtaining an acidic solution; and step 2, electrifying: carrying out short-circuit connection between the pressing unit and a direct-current power source to form a circuit; coating the acidic solution on the cable clamp and the adjacent steel strands, and starting the direct-current power source to continuously electrify the loop to the pressing unit and raising the temperature; continuously electrifying for 4-8 hours; and after electrifying, generating the white crystal rust on the adjacent steel strands. The method disclosed by the invention is relatively safe and convenient to operate, and can be used for relatively rapidly generating the white crystal rust which is similar with the field ground wire in component, so that researchers can conveniently develop corresponding researches and analysis.

Description

technical field [0001] The invention belongs to the field of DC deicing methods for overhead ground wires of 500kV transmission lines, and in particular relates to a method for simulating the ground wires of 500kV power transmission lines to generate white crystal corrosion when the ground wires are DC deiced. Background technique [0002] The 500kV transmission line refers to the use of 500kV voltage level to transmit electric energy. Compared with the 220kV transmission line, the relative investment per kilometer of the 500kV transmission line, the relative cost per kilowatt-hour of power transmission per 100 kilometers, and the consumption of metal materials are average. There is a substantial reduction, and the utilization rate of line corridors has been significantly improved; it is based on the many advantages of 500kV transmission lines that long-distance power transmission is mostly completed by transmission lines with a voltage level of 500kV or higher. The overhead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 易永亮陈如龙程孟
Owner GUIYANG BUREAU OF CHINA SOUTHERN POWER GRID CO LTD EHV TRANSMISSION CO