FISO Energy

 

Utility companies around the world are more than ever working to improve the management of the critical assets that are power transformers. Day to day operation supervision as well as lifetime temperature control can significantly optimize power transformer loading. Maximizing the performance of a transformer by monitoring its true temperature will reduce premature aging and allow for intelligent preventive maintenance planning, directly increasing the return on your investment.

 

 

FISO’s proposition to support the effort of utility companies is the Nortech Transformer Winding Hot Spot Temperature Monitoring System. Using proven Fiber Optic technology the Nortech system allows for direct, real-time, and long-term monitoring of power transformers, providing smarter dynamic substation and power grid management.

 

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NORTECH FIBER OPTIC TRANSFORMER WINDING HOT SPOT MONITORING

 

 

The Nortech Fiber Optic System


  

  • Reliable & Cost Effective Hot Spot Solution
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  • IEC Compliant EasyDisk Sensor Installation
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  • Leak-Free Tank Wall Optical Interface
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  • User-Friendly Installation and Operation
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  • Nortech Client PC Software for easy configuration and monitoring
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    The TPT-62 Fiber Optic Temperature Sensor with the EasyDisk

     


    The TPT-62 family of fiber-optic temperature probes employs industry standard 62.5µm core OM1 optical fiber for vastly improved optical, mechanical, and reliability properties over legacy 200µm core (1st generation) optical fiber sensors.

     

    The EasyDisk sensor tip assembly ensures IEC60076-2 Annex E compliant installation and enables quick insertion of the probes into the spacers within the windings of the transformer.

     


      

      

     

                         

     

     

     


    EasyDisk Key Features:

     

  • EasyDisk installed by FISO prior to shipping
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  • Yellow Spiral Wrap Cable locked on the EasyDisk
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  • Total sensor tip protection
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  • Quick and easy installation in the spacer without adhesive
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  • Optimal location of the sensor tip on the conductor allowing direct and accurate readings
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  • Increased robustness and protection during all the manufacturing processes
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  • TPT-62 and EasyDisk (NOMEXTM material) assembly tested to be fully immune to EMI
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    The Nortech Fiber Optic Monitors 

     

     

                               EasyGrid LTEasyGrid

    EasyGrid                                                                                                      EasyGrid LT

     

     

    The Nortech family of temperature monitors are provided in two classes: The EasyGrid is a full featured model, while the EasyGrid LT is a more compact model and very cost-effective in low channel count monitoring applications.

     

     

    Nortech Monitor Key Features:


  • Up to 18 optical channels
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  • 1 System Relay, for independent system fail safe alarm
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  • 0, 8 or 16 form C fully programmable relays
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  • 1 Analog Output for each optical channel
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  • Modbus, IEC61850, DNP3.0, Modbus TCP-IP, IEC 60870-5-104 communication protocols
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  • Large display screen (Colour Touch screen on the EasyGrid)
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  • Internal data storage and removable media storage (SD Card) for easy data export
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  • Operation Auto-Diagnostic & measurement Auto-Correct
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  • Easy front panel wiring
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    The Fiber Optic GaAs principle and the temperature sensor

     

     

    The measurement principle is based on white light absorption/transmission by a GaAs (gallium arsenide) semiconductor. The effects of temperature variations on this semiconductor are well known and predictable. As the temperature of the semiconductor changes, the semiconductor’s transmission spectrum (i.e. the light that is not absorbed) shifts also. At any given temperature there will be a wavelength at which the transmission jumps from essentially 0% to 100%. This jump is called the absorption shift, and the relationship between the specific wavelength where the absorption shift takes place and temperature is predictable.

     

     

    The sensor consists of a tiny GaAs semiconductor crystal bonded to one end of a well-polished optical fiber.

     

    White light launched from the monitor into the optical fiber travels through to the GaAs crystal, passes through it while being partially absorbed, and then is reflected back to the monitor by a mirror at the very tip of the sensor. Light reflected back to the monitor is coupled into an optical spectrum analyzer which then measures the optical power transmission versus wavelength. The position of the absorption shift is determined by the monitor using a proprietary signal analysis algorithm and is then correlated to the temperature of the GaAs crystal.

     

     

    Furthermore, since the semiconductor will not change over time, all sensors are interchangeable with no need for calibration or entry of factors when swapping sensors. For the same reason monitors never need recalibration after they leave the factory, while used under normal operating conditions.


     

    Nortech Accessories


     

    CFO External extension Cable
    Polyurethane external fiber optic cable for harsh environments. ST connectors for trouble-free installation. High quality assembly.
      ph012_easyplate EasyThrough
    3/8” NPT, oiltight, stainless steel mating. High pressure and high temperature resistant. Preinstalled on EasyPlate.
    pdf See datasheet   pdf See datasheet

    ph013_external_ext_cable EasyPlate/EasyRing
    Interface plate specifically designed for oil filled applications. Leak-free design. Long term reliability.
      ph014_oil_imm_ext_cable EasyCover
    Stainless steel Nema enclosure. Protects ST fiber optic connectors on the external side of the EasyPlate
    pdf See datasheet   pdf See datasheet

     

     

     

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