Sheath Circulation Online Monitor

Overview: The metal sheath of single-core cables generally adopts cross-connection double-ended grounding or single-ended direct grounding operation mode. Under normal conditions, the induced voltage from the metal sheath to the ground is only tens of volts, with induced current from a few amperes to over ten amperes. Power cables mostly use solid insulation cables, and there are many reasons causing cable deterioration, including electrical deterioration, thermal deterioration, chemical deterioration, mechanical deterioration, theft, etc. For high-voltage cables, the shielding layer can only be single-point grounded. If the cable sheath is damaged due to chemical, mechanical and other reasons, it will cause cable failure, threatening the safe operation of the power system. The sheath circulation online monitoring system monitors the induced voltage and circulation current of the cable metal sheath in real time, providing an important basis for cable operation and maintenance, with the characteristics of real-time, accuracy, and reliability.