Test method for testing cross interconnection performance of cable on laying site

Abstract

The invention provides a test method for testing the cross interconnection performance of a cable on a laying site, and the method comprises the steps: setting a test power supply, and enabling the test power supply to serve as a power supply for the performance test and loop resistance measurement of a cable metal sheath cross interconnection grounding system; applying a three-phase power frequency alternating current to a cable core of the cable metal sheath cross-connected grounding system by using a three-phase alternating voltage outputted by the test power supply, and measuring an induced voltage and a circulating current of a metal sheath in the cable metal sheath cross-connected grounding system so as to test the performance of the cable metal sheath cross-connected grounding system; and applying the DC voltage output by the test power supply to two ends of the cable metal sheath cross interconnection grounding system, and measuring the loop resistance of the cable metal sheath cross interconnection grounding system. According to the invention, the problem that the cross interconnection performance test of 110kV and above cable lines is difficult to implement on a laying site is solved, the system performance can be detected on site, and stable, reliable and safe power supply is ensured.

Description

technical field [0001] The invention relates to the technical field of electric equipment inspection, and more specifically, relates to a test method for inspecting cross-connection performance of laying field cables. Background technique [0002] With the rapid development of my country's electric power industry, especially the development and transformation of urban power grids, high-voltage and extra-high-voltage power cables have been widely used. At this stage, the cable metal sheath of 110kV and above extra-high voltage cables often adopts a cross-connection grounding method. [0003] The cross-interconnection grounding system of the cable metal sheath is very important. Defects such as wrong wiring or poor contact may cause cable breakdown. Therefore, it is necessary to effectively test the performance of the cable metal sheath cross interconnection grounding system. However, due to the lack of suitable test power supply and test methods when inspectors inspect the ...

AI Technical Summary

Problems solved by technology

However, due to the lack of suitable test power supply and test methods when inspectors inspect the performance of the cable metal sheath cross-connection grounding system in the current power equipment, especially at the construction site, resulting in the failure of the cable metal sheath cross-connection grounding system Performance is difficult to verify in cable applications, which will affect the reliability and safety of power supply

In addition, the cable metal sheath cross-connection grounding system has multiple connections. Measuring the loop resistance can prevent the protective layer from being miswired or welded or poorly connected. However, due to the lack of suitable power supply for on-site construction, it has not been implemented

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