UM3+™ Underground Line Sensor

Increase Visibility of Underground Circuits

Sentient Energy’s UM3+ is an intelligent underground sensor with substation-class measurement, computing and processing capabilities. The UM3+ is a powerful sensor designed to be a platform for a set of applications, installed and configured.

UM3 line monitor.

The UM3+ is an important element of Sentient Energy’s Grid Analytics System™, which consists of the MM3™ and ZM1™ overhead sensors, UM3+ underground sensors, and the Ample® Analytics Platform. The solution provides utilities with increased distribution system visibility to improve reliability and enable data-driven operational decision making.

UM3+ Line Sensor Features

Powerful Sensing

Sensing and measurement capabilities for the UM3+ include fault detection, highly accurate load and fault magnitude, and waveform capture. It’s also equipped with GPS for location, and a GPS/PPS level precision clock for highly accurate time-stamping, thereby allowing collating waveforms with those from other devices to perform a thorough post-event analysis.

Deployment Versatility

The UM3+ can monitor three to twelve phases to support a range of underground installations including pad mounted transformers, pad mounted switch cabinets, ring main units (RMUs), and above grade vaults. Power harvesting technology generates all the power the UM3+ needs from the magnetic field surrounding one conductor carrying as little as 12A. This power harvesting eliminates the need for AC power or battery maintenance. For locations where there is already a 100-240VAC supply available, Sentient Energy provides an AC adapter that can be used instead of line harvesting.

Advanced Network Communications

The UM3+ supports cellular, mesh or a combination of both communication networks, and is wirelessly configurable allowing parameters to be adjusted as needed. Operating system and application software can also be upgraded wirelessly to streamline sensor management.

UM3+ Line Sensor Applications

Fault Detection & Location

The UM3+ uses advanced fault detection algorithms to sense system faults on underground lines in real-time, communicating fault information immediately to the utility control center for integration with SCADA, DMS or OMS systems. With more precise fault location information, operators can dispatch crews to the correct location, significantly reducing patrol time and outage duration.

Person in a hard hat working on underground lines.
Green metal housing for UM3 line monitor and lines.

Interruption & Disturbance Analysis

Equipped with high resolution waveform capture capability at a rate of 256 samples per cycle, the UM3+ captures and records waveforms of faults and line disturbances. Complete waveform data for faults is immediately available in Ample, and waveform data for disturbances is stored locally on the UM3+ and is available to download to Ample analytics software when needed. Understanding the root causes of power system interruptions essential for improving distribution grid reliability.

System Status Monitoring

The UM3+ Log-I app continually measures current for load monitoring purposes. This collected data is processed on the device and critical information such as alerts, daily peaks, and averages are reported to Ample analytics software.

Screenshot of graphs showing load current.

Download Product Data

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