TPT-32 Temperature sensor for oil-fi lled transformers
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TPT-32 Temperature sensor for oil-lled transformers Double PTFE sheathing Proven semiconductor optical absorption principle EMI/RFI immune Resists kerosene vapor High exibility and visibility With thousands of ber optic temperature sensors used and installed worldwide, FISO’s heavy duty TPT-32 ber optic temperature sensor, specically designed for permanent installation in oil-lled transformers, clearly demonstrates FISO’s experience and leading edge in transformer instrumentation for direct winding temperature measurement. Custom lengths from 1 to 15 meters The TPT-32 sensor possesses a resilient construction, resistance to chemicals and all dielectric resistant materials featuring complete immunity to EMI and RFI environments. With a 3 mm outer diameter, a unique double PTFE oil permeable sheathing with transversal slits (spiral wrap), the TPT-32 is designed to withstand installation stresses, harsh testing conditions such as kerosene vapour, heat runs and induced vibration during the overall lifetime of the transformer. The TPT-32’s unique rugged design offers utmost protection for easy and safe installation. Due to its length customizable tapered tip the sensor can safely be positioned directly in hard to reach areas, allowing real-time monitoring of potential hot spots in transformer windings. Our mechanical design and semiconductor epoxy encapsulation eliminate the risks of air gaps when compared to other designs which may be more susceptible considering the design techniques used. FISO’S Nortech product line uses a proven optical absorption/transmission technology using silica ber and a GaAs semiconductor. The optical effects of temperature variations on the GaAs semiconductor are well known and predictable, ensuring repeatable, accurate measurements over extended periods. As the temperature of the semiconductor increases, the semiconductor’s transmission spectrum (i.e. the light that is not absorbed) shifts to higher wavelengths. At any given temperature, transmission jumps essentially from 0% to 100% at a specic wavelength. Consequently, measuring the position of the absorption shift gives a measure of the semiconductor’s temperature. It is important to note that the analysis isn’t intensity dependent but wavelength dependent. The TPT-32 is available in custom lengths of 1 to 15 meters with a temperature range of −40°C to 225°C. The TPT-32 temperature sensor is compatible and interchangeable with FISO’S Nortech product line. It can be used in conjunction with the Nortech Sentinel or the Nortech TT optical signal conditioner without any recalibration. Power transformer temperature monitoring n Core n Windings n Bushings Load Tap Changer temperature monitoring n Contacts n Oil High voltage testing Transmission lines High voltage cables

Temperature range Available sensor length Connector type Fiber type Cable sheathing Sensor dimensions Sensor certification Part number Double PTFE sheathing (spiral wrap) with transversal slitting 3 mm PTFE spiral wrap cable* Dielectric and kerosene vapor tests approved * Both cables are designed with transversal slits for a faultless oil flow into the sheath PTFE cable Heat shrink: Crosslinked FluoropolymerTubing Yellow PTFE spiral Wrap luser specified -Custom length luser specifiedl Complete Nortech Solution Includes Nortech TT or Nortech Sentinel NOR-EST EasyThroughs Fiber optic external...