A New Type of Current Mining Device for Testing the Insulation of High-Voltage Cables by Ground Current Method

Aiming at using the ground current method to test the insulation of high-voltage cables, this paper studies a new device for collecting small currents when testing the insulation of high-voltage cables by the ground current method, which is used to monitor the insulation state of the outer sheath of the cable. The new low-current acquisition device uses flexible current clamps for current sampling, and the purpose of judging whether the high-voltage cable can operate safely is achieved by testing the circulating current of the sheath. Demonstration through analysis of domestic and foreign insulation outer sheath monitoring methods and their existing problems, a new type of monitoring device using flexible current clamp sampling and grounding circulation method measurement is designed, the development process and the structure of flexible current clamp are also discussed in detail. through a large number of practical verifications, we find that the new type of current mining device for testing the insulation of high-voltage cables by ground current method meets the technical requirements of the site and has application prospects.