LIOS EN.SURE Distributed Power Cable Monitoring

As demand for electricity continues to rise, so does the challenges for power companies and power grids. To overcome one of the main factors of optimization of underground power transmissions and distribution installations we designed EN.SURE – with a temperature resolution better than 1°C and real time thermal rating you can safely utilize the existing network capacity to its maximum.

If you want to use your cables effectively and not have to worry about thermal soil resistivity, power line arrangement, adjacent cables, and others sources dispatching heat the LIOS EN.SURE is the perfect solution. Maximum applicable current load is no longer impossible, because with our technology and a simple optical fiber along the cable route, you can now monitor temperature in real time along the entire cable.

With our power cable monitoring system and powerful software it is possible to get a very detailed temperature read every few centimeters and store all this data for further analysis. In case of a failure, our system is still able to monitor the installation due to a built-in redundancy, offering an economic solution with less down-time and constant surveillance. Our Real Time Thermal Rating solution furthermore provides the operator with the ability to predict the behavior of the transmission system upon major changes made to its initial operation conditions.

When choosing a temperature monitoring system from NKT Photonics, you will be assisted from start to finish with your project and we will turn your project into a perfect solution. The passive and maintenance-free fiber optic sensor cable which is the basis for the EN.SURE real time condition monitoring solution can either be integrated directly inside an insulated high voltage underground cable (for instance FIMT, fiber in metal tube), mounted externally on the cable jacket, or installed in a separate duct close to the power cable. We will of course help you find the optimal solution for your project.


  • 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 (RRTR) software calculation engines based on IEC, AEIC, and IEEE standards

LIOS EN.SURE has a broad range of industrial applications offering maximization of resources, operational safety and cost-effectiveness in installations like transmission, distribution underground network, power transformers, and overhead transmission lines.

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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