EN.SURE Power Cable DTS System

The Luna EN.SURE power cable DTS system is an optical fiber-based temperature measurement system designed to monitor underground T&D power cables and overhead transmission lines. Using an optical fiber embedded in the power cable, or installed externally, the EN.SURE system can continuously monitor and predict power cable load, cable core temperature over single-ended lengths of up to 40 km per system.

The EN.SURE power cable DTS system provides a continuous temperature profile over the entire length of the sensor cable with a resolution better than 1°C, offering superior hot spot detection on underground T&D power cables and overhead transmission lines over distances of up to 40 km. This distance can be increased to 70 km by choosing our unique Long Range EN.SURE DTS system.

By combining the EN.SURE system with our class-leading RTTR software, the DTS system can calculate the cable conductor temperature in real-time to predict cable load (Real-Time Thermal Rating), thereby allowing the operator to run the cable above nominal capacity for peak emergency situations.

A Mean Time Between Failures of 40+ years

A power cable DTS system must be very reliable and in this regard, the EN.SURE system is exceptional. The controller has no moving parts, it is immune to electromagnetic disturbances, and it has an MTBF of 40+ years, ensuring reliable temperature monitoring in even the toughest environments.

The self-diagnosing features free you from worrying and allow you to focus on other important tasks.


  • Superior hotspot detection along the whole sensor cable
  • Flexible and direct connection to management systems such as SCADA (link)
  • Up to 16 individual channels enabling one unit to cover complex infrastructure
  • Temperature resolution better than 1 °C
  • Maintenance-free and simplified outdoor installation capability
  • Real-time Thermal Rating (RTTR) software calculation engines based on IEC, AEIC, and IEEE standards
  • Mean Time Between Failures of 40+ years

When choosing a power cable DTS system from Luna, you not only buy the most reliable DTS hardware on the market but also our decade-long expertise in power cable and transmission line temperature monitoring. We partner with you from the initial planning phase, over installation and commissioning and when everything is running, we can offer service agreements to ensure your DTS solution operates smoothly for years to come.

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En.SURE20, EN:SURE40, EN.SURE60, EN.SURE80 Monitoring ranges 2 km, 4 km, 6 km, 8 km (per channel)
EN.SURE100, EN.SURE120, EN.SURE140 Monitoring ranges 10 km, 12 km, 14 km (per channel)
EN.SURE160, EN.SURE180, EN.SURE200, EN.SURE300 Monitoring ranges 16 km, 18 km, 20 km, 30 km (per channel)
EN.SURE200SM, EN.SURE300SM, EN.SURE400SM Monitoring ranges 20 km, 30 km, 40 km (per channel)
Internal Optical Channels 1, 2, 3, 4, 6, 8, 9, 12, 16 (options)
Spatial Resolution 1 m

Communication/SCADA Interfaces

Programmable Inputs 4 (optional up to 40)
Programmable Outputs (potential-free) 10 (optional up to 106)
Analogue Outputs 4-20 mA (external, optional)
Communication Protocols MODBUS, DNP3, IEC60870, IEC 61850 (options)
External Sensor Inputs Pt100(2x), Current 0-20 mA (2x), Voltage 0-10 V (2x) (option)

Communication/SCADA Interfaces

Communication Interfaces Ethernet TCP/IP (2x), RS232, USB

Mechanical Data

Controller 19" rack/3 rack height units
Dimensions (HxWxD) 13.1 x 48.3 x 33.8 cm
Weight 13 kg

Electrical Data

Operating Voltage (DC Controller) DC nom. 12 ...48 V (max. 10 ... 60 V DC)
Mains Voltage (AC Controller) Ac 100 ... 240 V or DC 110 ... 220 V
Power Consumption (DC Controller) <25 W (max. 45 W/60°C)

Optical Data

Optical Connector E2000/APC
Laser Classification Class 1M (EN60825-1)
Fiber Type, Multimode - Ranges 2 ...20 km Gradient index 50/125 µm multimode
Fiber Type, Singlemode - Ranges 20 ... 40 km SM 9/125 µm singlemode

Environment Conditions

Storage Temperature -35 ... + 75°C
Operating Temperature -10 ... +60°C
Humidity (non condensing) ≤95% rel.
Protection Class (IEC 60529) IP51

Type Tests

TÜV Rheinland (Germany) and
VdS Schadenverhütung GmbH (Germany) as far as required
Electrical safety IEC/UL 61010-1, IEC 61140
EMC EN61326-1, EN61000-6-2,3,-4-2,3,4,5,6,8,11
-3-2,3, EN 50130-4, EN 55011, FCC 47 CFR Ch.1 Part15, Environmental testing IEC 60068-2-6,14,27,30,64, RoHS directive, WEEE directive, Low voltage directive