Technologies
Remote TRU monitoring for isolated CP assets.
Satellite-enabled transformer rectifier unit monitoring for cathodic protection systems. The platform measures TRU output voltage, output current, supply health, interruption and restoration state, instant-off potential where fitted, alarm conditions, and Myriota telemetry-ready asset data for remote CP infrastructure.
Remote TRU Monitoring Method
Measure TRU Output
Measure rectifier output voltage and output current to confirm the TRU is delivering cathodic protection current within the expected operating envelope.
Check Supply Health
Monitor local controller supply, enclosure state, communications status, watchdog activity, and other site health indicators.
Control Off Window
Where the interrupter option is fitted, local firmware controls the off interval and captures instant-off data without relying on instantaneous satellite timing.
Report Remotely
Package voltage, current, off-potential, restoration state, alarms, and sequence data into compact payloads for Myriota satellite telemetry.
Press once to run a remote TRU output and restoration check.
The sequence below shows an operator initiating a remote TRU monitoring check. The field unit confirms output voltage and current, executes a locally controlled off-window where fitted, captures the instant-off reading, verifies restoration, and sends the result snapshot through the Myriota satellite network.
Operator starts a controlled TRU status, output and restoration check from the remote dashboard.
Command packet is uplinked, relayed and delivered to the remote TRU monitoring package.
The field unit samples output, supervises the off-window locally, and confirms CP current restoration.
Normal CP on
Off-window active
Output values, instant-off reading, restoration result and alarm flags are prepared for telemetry.
How The TRU Monitoring System Operates
The monitoring system connects at the transformer rectifier unit and measures the normal operating output of the cathodic protection power supply. Output voltage and current are sampled locally to confirm that the asset is delivering CP current within the expected range.
Where the interrupter option is fitted, the local controller executes the programmed off-window and captures instant-off potential data without depending on instantaneous satellite timing. The field unit is responsible for restoring CP output after the defined interval.
The platform evaluates output state, restoration confirmation, low supply, watchdog activity, communication status, enclosure condition, missed schedule events and alarm flags that may indicate TRU or CP circuit issues.
Processed measurement data is compressed into compact telemetry payloads for remote Myriota satellite reporting, allowing long-term trending, exception-based maintenance and stronger CP performance records between field visits.
IOUT
ALARM
Field-ready architecture for TRU output monitoring.
- Measures TRU output voltage and output current using isolated sensing suitable for CP assets.
- Supports locally controlled interruption and instant-off capture where the interrupter option is fitted.
- Confirms CP current restoration after a programmed off-window or diagnostic sequence.
- Reports controller supply, communications state, watchdog status, enclosure condition and fault flags.
- Packages processed operating data into telemetry-ready payloads for remote satellite reporting.
- Designed for long-term monitoring of isolated cathodic protection assets where manual inspection is costly or infrequent.
Local Control And Safe Restoration
The satellite link is used for remote command, schedule updates and result return. Time-sensitive interruption and restoration logic stays inside the field unit so the TRU package can complete the test sequence without relying on real-time network control.
For production deployments, the monitoring and interrupter package should be engineered with manual bypass, maximum-off timing, watchdog supervision, surge protection, thermal validation and site-specific electrical review.
The intended operating principle is simple: monitor continuously, interrupt only within controlled limits, restore CP current automatically, then report the measured result and any exception flags.
Manual Bypass
Allows CP continuity and service access if the monitoring or interrupter package needs to be isolated.
Watchdog Logic
Supervises the controller and restores output after defined limits or abnormal firmware conditions.
Maximum-Off Timing
Constrains the interruption window so the system does not leave the CP output offline after a test.
Reference TRU Monitoring Capability
The current reference concept is based on a 12 V controlled, isolated-gate-drive solid-state architecture for TRU monitoring and off-potential testing.
0–50 VDC
Reference TRU output voltage design range.
0–50 A
Reference TRU output current design range.
12 VDC
Nominal control supply input for local controller and telemetry package.
+15 / -5 V
Reference isolated MOSFET gate-drive rail arrangement.
Telemetry Payload
Each completed monitoring or interruption sequence can be compressed into a small telemetry payload for satellite transmission. The payload is intended to support remote trending, exception response, alarms and maintenance planning.
TRU Output
Output voltage, output current and operating state measured at the rectifier.
Instant-Off Data
Off-potential reading captured during the locally controlled interruption window where fitted.
Restoration Status
Confirmation that CP output returned after the programmed off-window or diagnostic check.
Status Flags
Low supply, missed restore, watchdog event, thermal concern, communications fault, overrange and alarm indicators.
Field Test Procedure
Site And TRU Review
Confirm the site ID, TRU rating, CP operating condition, work authority, enclosure requirements, isolation, surge protection and bypass provisions.
Install Monitoring Package
Connect voltage sensing, current sensing, control supply, reference inputs where required, antenna and telemetry hardware using approved installation methods.
Measure Normal Output
Record TRU output voltage, output current, controller supply and communications status under normal cathodic protection operation.
Run Controlled Off Test
Where fitted, execute the programmed local interruption interval and capture instant-off data within the configured measurement window.
Confirm Restoration
Verify that TRU output current has returned after the off-window and flag any missed restoration, low current or abnormal output condition.
Transmit Result
Queue the processed measurement values, restoration state, sequence number and alarm flags for Myriota satellite telemetry or local retrieval.
Measurement Interpretation
The monitoring system is intended to support TRU and cathodic protection asset assessment in accordance with operator procedures and integrity management programs.
Measured values should be interpreted alongside standard CP field measurements such as pipe-to-soil potentials, ON/OFF surveys, interference testing, station inspection records and TRU maintenance history.
Output trends, instant-off readings, restoration confirmations and alarm flags are operational indicators for trending and remote condition assessment rather than standalone certification measurements.
Alarm thresholds and acceptance criteria should be defined by the pipeline operator, asset owner or governing cathodic protection standard applicable to the installation.
Typical Field Applications
Transmission Pipelines
Remote TRU status monitoring, output confirmation and instant-off data capture for hard-to-access CP stations.
Tank Farms And Anode Beds
Ongoing monitoring of rectifier output, CP current restoration and abnormal load changes across distributed CP assets.
Remote Infrastructure
Satellite-enabled TRU assurance for mines, rail corridors, remote pipelines and locations where manual inspection is costly.
TRU Monitoring Record
A complete TRU monitoring record should include site ID, TRU ID, output voltage, output current, controller supply, instant-off reading where captured, restoration state, telemetry sequence number and any alarm or validity flags.
Plan A Remote TRU Pilot
Talk with us about TRU compatibility, sensing requirements, Myriota telemetry configuration, dashboard payloads and a pilot installation for isolated cathodic protection assets.