RTU-OF

Remote unit for OF cable supervision

Remote monitoring of oil pressure in oil-filled underground cables.

  • 8 inputs · 8 outputs
  • 4 analog inputs
  • Ethernet · LTE
Hardware Remote unit for OF cable supervision — RTU-OF

Oil-filled underground cables depend on pressure staying within range: an undetected leak degrades the insulation and can end in a costly failure. This remote unit is built on the same platform as the Telemetry RTU for MV substations and adds analog acquisition modules to read pressure transmitters, scaling from 4 to 32 sensors with no hardware change. It reports a drop as it happens, over the same protocol your SCADA already speaks.

  • Scalable

    From 4 to 32 sensors by adding analog acquisition modules to the RS-485 bus, with no change of unit or platform.

  • Redundant

    Cellular link with automatic fallback and UPS supply: events survive a network or power outage.

  • Compatible

    Native DNP3.0 and MODBUS: it joins the existing SCADA with no intermediate development.

  • Early detection

    A pressure drop is reported as it happens, before it degrades the insulation.

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01Technical specifications

Technical specifications

  • Inputs and outputs

    • 8 dry-contact digital inputs, 3.5 kV isolation, up to 50 VDC (220 VDC on request)
    • 8 dry-contact relay digital outputs, 100 V / 0.4 A
    • 4 built-in analog inputs (4-20 mA or 0-5 VDC)
    • Expansion up to 32 pressure sensors by adding analog acquisition modules (3 channels each) over the RS-485 bus
    • Pressure sensor supplied: PI transmitter 0-4 Bar, AISI 316 body, 1/4" NPT connection
    • Sensor: -40°C to 105°C temperature range, 8-30 VDC power, 2-wire 4-20 mA output

  • Connectivity and communications

    • 2 RS232 ports
    • 1 RS485 port (expansion bus for analog acquisition modules)
    • 1 10/100 Mbps Ethernet port
    • LTE cellular connectivity with automatic 3G/2G fallback, dual SIM
    • Optional multi-constellation GPS

  • Protocols and gateway

    • DNP3.0, IEC 60870-5-104 and MODBUS TCP as a slave toward the SCADA
    • MODBUS TCP, RTU and ASCII as a master toward the analog acquisition modules and other field devices
    • Protocol gateway: concentrates and converts MODBUS to DNP3.0 or IEC 104
    • Transparent TCP bridges for each serial port

  • Management and reliability

    • Local and remote configuration via web interface
    • Remote (OTA) or local USB firmware update
    • Integrated battery charger with automatic weekly test
    • 72-hour battery autonomy on power loss
    • Automatic alarm on battery failure, reported to the SCADA
    • IP65 enclosure, operating temperature -40°C to +85°C

02Main applications

Main applications

  • Pressure monitoring on oil-filled cables
  • Complex underground networks
  • High and medium voltage substations
  • Integration with existing SCADA systems
  • Predictive maintenance of critical assets
  • Expanding measurement points without replacing the existing RTU

Solutions using it

Where it is deployed

03Other products

Other products

Need this unit, or a variant of it?

We adapt inputs, outputs, protocols and operating logic to the requirement. Tell us what you need to solve.

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