Protective circuit verification

Verification of dielectric properties, limited to power frequency voltage withstand or HV test on power as well as control and protective circuits. 

The need of monitoring sacrificial CP systems is under discussion. Some authors state that sacrificial CP does not need monitoring, because the current is self-regulating. Others state that all CP installations are selfregulating to a certain extent and that verification is needed to make sure the system is not outside its region of abihty to provide protection current where and as much as it is needed. Because most sacrificial CP systems involve direct metallic contact between the steel and the sacrificial anode system, monitoring then requires special provisions. A possibility is to make parts of the system without anode-to-steel connections and to provide an external circuit that is normally connected, but may be switched open to allow current and depolarization measurements. Those parts should be representative for the whole system. 

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