A choice of anodes

Cathelco offer a choice of anodes according to the requirements of different types of wind turbines. Stand-off disc anodes are typically used for monopile structures where the bracket can be mounted on the transition piece. As the anode is at a distance from the structure the need for a di-electric shield is eliminated. In other cases linear surface mounted anodes can be used where the backing shield provides di-electric protection.

Stand-off anodes are circular with current emitting faces made from mixed metal oxide on a titanium substrate. The surface mounted anodes are made with tubular elements mounted on an ABS plastic backing sheet. They are all rated to a depth of 140 metres.

turbine-anodes

Zinc reference electrodes

These reference electrodes have a zinc element mounted on an integral backing shield with a rear gasket allowing compression around the column. They are fitted using self snapping torque nuts for easy installation. The torque nuts also isolate the stud, avoiding current passing through it and preventing localised overprotection.

turbine-Zinc-reference-electrodes

Silver/silver chloride reference electrodes

These are mainly used to monopile structures because they are highly accurate and more stable at higher negative potentials. The system monitors the potential gradient between two electrodes which are mounted on a bracket fixed to the transition piece.

silver-chloride-reference-electrodes

Self snapping torque nuts for easier installation

Cathelco have devised a self-snapping torque nut system which speeds up the installation process and ensures that anodes and reference electrodes are securely attached at the correct level of torque.

The upper section of the bolt head shears off at the predetermined torque leaving the lower section intact. The second bolt head can be used to remove the anode or reference electrode at a later date, if required.

1.Double headed self torquing snap-nut on stud.
1.Double headed self torquing snap-nut on stud.
2. Nut is tightened using ordinary wrench. 
Top section breaks off when correct torque is achieved.
2. Nut is tightened using ordinary wrench. Top section breaks off when correct torque is achieved.
3. The lower head allows the anode to be removed when replacement is necessary.
3. The lower head allows the anode to be removed when replacement is necessary.