Everything about Cathodic Protection Rectifier totally explained
Cathodic Protection Rectifiers are
AC powered
electrical equipment that provide
direct current for
impressed current cathodic protection systems.
Rectifier units are often custom manufactured and equipped with a variety of features, including oil cooling, automatic output adjustment, various type of electrical
enclosures, remote monitoring, remote output adjustment, an
AC electrical outlet, selectable AC input setting, three phase AC input.
Cable Connections
The rectifier output DC negative terminal is connected to the structure to be protected by the cathodic protection system.
The rectifier output DC positive cable is connected to the auxiliary
anodes.
The AC power cables are connected to the rectifier input AC cable terminals.
Output Adjustment
The output of the rectifier is usually determined by a cathodic protection expert to optimize the level of protection on the target structure. Many rectifiers are designed with tap on the
transformer windings and jumper terminals for connection of jumper bars. The jumper bars or tap bars are moved between taps to vary the voltage output of the rectifier unit.
Rectifiers for water tanks and used in other applications are made with
solid state circuits to automatically adjust the operating voltage to maintain a target current output or structure-to-electrolyte
potential.
Meters
Analog or
digital meters are often installed to show the operating voltage (DC and sometime AC) and current output. Typically a
shunt circuit composed of a
calibrated
resistor and
voltmeter is used for current output measurement.
Further Information
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