Underground Distribution Sensor

SEL RPMA Catalog
The SEL-8301 Underground Distribution Sensor is designed to optimize outage management and improve underground reliability. With a line current measurement accuracy of 1.5 percent, it allows for more effective switching decisions, letting you restore power to more customers.

Using a wireless RPMA network, the SEL-8301 sends fault, load current, and water depth information to your control center for efficient dispatching of repair crews and reduced outage durations. The flexible design makes the SEL-8301 ideal for underground vaults, pad-mounted switchgear and transformers, and high-rise distribution feeders and transformer rooms.


Features & Benefits:

Improved Underground Reliability

Reduce fault location time with the SEL-8301. Fault information and load data are sent via a wireless RPMA network to the central operations center for dispatching repair crew personnel. With accurate fault location, crews can focus on restoring power instead of patrolling lines.

Improve Operational Efficiency

Automatically measure and report the water level in a subsurface vault or manhole with the water depth sensor. The sensor enables the utility to accurately dispatch the right number of pump trucks to the vault. This ensures the vault is ready to enter upon repair crew arrival, reducing the time a repair crew is onsite.

Enhance Operator Decision Making

Sectionalize around the faulted cable section on feeders connected to medium-voltage pad-mounted switchgear and junction boxes. Accurate load data from the SEL-8301 helps operators to make switching and sectionalizing decisions during emergency conditions.

Accurate Fault Determination

Determine the fault type and prioritize repair efforts to improve system reliability. The SEL-8301 automatically adapts its trip threshold based on the measured load current to ensure good coordination. It monitors for system protection operations to distinguish between fault types, circuit outages, and normal system conditions.

Reliability in Harsh Subsurface Environments

The SEL-8301, SEL-8302 Current Transformer, and various accessories exceed the demanding requirements of underground applications and are suitable for harsh subsurface vault applications susceptible to flooding. With IP68 ingress protection, the SEL-8301 reliably operates in water up to 15 feet (4.5 meters) deep.

Remote Monitoring

Eliminate the challenges of locating and troubleshooting for faults in hard-to-reach subsurface applications, such as manholes and vaults. Monitor electric distribution circuits in high-rise buildings and large factory facilities. Utility personnel no longer need to enter a vault or structure to locate the fault. All sensor statuses can be viewed remotely from a centralized display.

TYPE Device Manufacturer, Platform Developer
PRODUCT CAPABILITIES Optimize Outage Management and Improve Underground System Reliability
RPMA Smart Grid





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