Rectifier Troubleshooting
How to interpret zero output, voltage-only output, current-only changes, blown components, tap settings, and abnormal output trends.
Cathodic Protection Rectifiers
Rectifiers are the control point for many impressed current cathodic protection systems. A rectifier inspection is not just a meter reading; it is a check of power conversion, circuit continuity, current delivery, control settings, anode-bed loading, and whether the system behavior matches the protected structure.
Rectifier Authority Pages
Rectifier Efficiency
How DC output power, AC input power, panel meters, and kilowatt-hour meter data fit together in a rectifier efficiency check.
Rectifier Output
How to read and verify DC voltage, DC current, shunts, taps, polarity, and output adjustments without mistaking panel readings for proof of protection.
What a Rectifier Reading Can and Cannot Prove
A rectifier reading proves that the power source is producing some measurable DC output at the time of inspection. It does not, by itself, prove that all protected structures satisfy a cathodic protection criterion, that current is distributing correctly, or that every anode branch is active.
Good interpretation compares rectifier output with structure-to-electrolyte potentials, instant-off data, anode lead currents, historical output, RMU values, circuit resistance, and known system configuration.
Core Rectifier Inspection Items
- AC supply condition, breaker status, and enclosure safety.
- DC output voltage and DC output current.
- Tap settings, polarity, coarse/fine adjustments, and automatic-control settings where present.
- Shunt rating, meter accuracy, and independent DVM verification.
- Anode-bed circuit resistance and branch-current balance.
- RMU or remote monitoring agreement with field readings.
- Evidence of overheating, corrosion, loose conductors, failed surge protection, or damaged cabinet components.