Special lead wire for transmission cable tower arrester test

Abstract

The invention discloses a special lead for a test on a lightning arrester of a power transmission cable tower. The special lead comprises a lead body; the lead body comprises a lead conductor, wherein an insulating layer covers the lead conductor, a copper wire mesh shielding layer is twisted outside the insulating layer, a protective layer covers the copper wire mesh shielding layer and heat-shrinkable tubings are respectively arranged at the two ends of the protective layer; one end of the lead conductor is connected with a clamp, and the other end of the lead conductor is connected with a conductor plug; the copper wire mesh shielding layer at one side of the conductor plug is connected with an extraction plug of the copper wire mesh shielding layer. The special lead is characterized in that a layer additional copper wire mesh shielding layer covers the protective layer, and an additional protective layer covers the additional copper wire mesh shielding layer; the additional copper wire mesh shielding layer is shorter than the lead conductor, and discharging distances are set between the two ends of the additional copper wire mesh shielding layer and the two ends of the lead conductor; the two ends of the additional protective layer is integrally and hermetically connected with the protective layer; a ground wire is drawn out of the additional copper wire mesh shielding layer. The lead is good in shielding effect and is unlikely to be interfered, and the test is more accurate and reliable.

Description

technical field [0001] The invention relates to a connection device used in the test of power equipment in a power system, in particular to a special lead wire for the test of a power transmission cable tower lightning arrester. Background technique [0002] As an important device to protect lines and cables from lightning overvoltage and operating overvoltage damage, the lightning arrester for transmission lines has received more and more attention. , in parallel with the cable line. During normal operation, the arrester does not conduct (only microampere-level leakage current flows). When the overvoltage acting on the arrester reaches its operating voltage, the arrester conducts, and releases the overvoltage energy through a large current, and the overvoltage The voltage is limited to a certain level. After releasing the overvoltage energy, the arrester returns to its original state, thus ensuring that the cable line is not damaged by the overvoltage. [0003] In order ...

AI Technical Summary

Problems solved by technology

[0005] However, the special lead for the above-mentioned patent application has poor shielding effect, is easily disturbed, and affects the accuracy of test results.

Moreover, the thin connection between the fixture and the lead conductor is prone to breakage, and the service life is short; in addition, the main body of the lead wire and the test instrument for testing cannot be fixed, and because the main body of the lead wire is very heavy, it will lead out the plug to the copper mesh shielding layer. , The conductor plug will cause pulling, which will also cause unreliability or even damage to the connection

Images