Device, system and method for measuring leakage current of high-voltage direct-current cable

Abstract

The invention discloses a leakage current measuring device for a high-voltage direct-current cable. The leakage current measuring device comprises a current measuring module and a loop protection module, wherein the first end of the loop protection module is connected with a tested high-voltage direct-current cable; the first end of the loop protection module is also connected with the first end of the current measurement module, and the second end of the loop protection module is connected with the second end of the current measurement module; the second end of the current measurement moduleis grounded; the current measuring device is used for measuring the leakage current of the measured high-voltage direct-current cable; and the loop protection module is used for protecting the currentmeasurement module from being damaged. The embodiment of the invention further discloses a corresponding measurement system and method, and by implementing the embodiment of the invention, the leakage current of the high-voltage direct-current cable can be measured in real time during the pre-identification test of the high-voltage direct-current cable, the safety and stability of the measurementprocess are effectively improved, and the evaluation of the insulating property of the high-voltage direct-current cable during the pre-identification test is facilitated.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a leakage current measurement device, system and method of a high-voltage direct current cable. Background technique [0002] With the continuous development of the field of power transmission, HVDC transmission lines have the advantages of low cost, low loss, and no reactive power, and have been widely used in long-distance power transmission. As an important part of the DC transmission system, high-voltage DC cables can operate safely for the stability of the high-voltage transmission network. Therefore, in order to assess and verify the long-term operating performance of high-voltage cable products, generally after the development test and type test are completed, a pre-qualification test of up to 12 months will be carried out before commercial operation. [0003] During the prequalification test long-term voltage test, the leakage current mea...

AI Technical Summary

Problems solved by technology

However, in the process of implementing the present invention, the inventors found that the prior art has at least the following problems: due to the long pre-qualification test time, accidents such as test voltage fluctuations, commutation or cable breakdown may occur, resulting in damage to the measuring instrument, Seriously affect the smooth progress of leakage current measurement and the accuracy of measurement results

Existing technology does not provide a good assurance of the stability of leakage current measurements and the safety of test instruments during pre-qualification testing

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