Measure temperature reliably in high-voltage systems
To ensure optimal operational safety for power plants and grids, critical factors, such as hot spots inside high-voltage transformers, power-factor-correction capacitors and alternators are monitored. Similarly, temperature is routinely measured on high-voltage distribution power lines, and in gas-isolated power breakers and power-factor-adjusted capacitors. The FotempTrafo is a fiber-optic thermometer that is available with one to eight measurement channels. Its compact design and height-adjustable DIN-rail clip allow for easy installation in a cabinet. A wide selection of interfaces (RS-232, RS-485, Profibus and Modbus) makes communication easy. A fast measurement speed of 250 ms per channel allows the direct detection of overloads. Its measurement range is from –200 to 300°C, with an accuracy of±0.2K, says the company, which notes that its use of gallium arsenide (GaAs) in the sensor tip eliminates the need for recalibration throughout the product life. The probe sensor is completely non-conductive, and the fiber-optic sensors offer complete immunity against radio-frequency interference (RFI), electromagnetic interference (EMI), nuclear magnetic resonance (NMR) and microwave radiation— Optocon AG, Dresden, Germany