What is impressed current cathodic protection system?

Impressed current cathodic protection system is also known as impressed current system, is in the same electrolyte around the protected structure auxiliary anode buried in the environment, through the power supply for auxiliary anode anode has been flow, in order to be protected as the cathode structure, power supply circuit, will direct current to the protected metal, make the protected metal into the cathode to the implementation of cathodic protection.