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Line Tuners
The line tuner works with the coupling capacitance to provide a low-loss coupling path between the carrier communication equipment and the high-voltage power line. AREVA offers line tuners in the following types: Single-Frequency Resonant line tuners allow a single narrow band to pass, while rejecting all other frequencies. Two-Frequency Resonant line tuners allow two separate narrow bands to pass, while rejecting all other frequencies. The frequency bands must be separated by at least 25% of the upper frequency or 25 kHz, whichever is greater. Band-Pass line tuners are designed to pass wide bands of frequencies, while rejecting frequencies outside of the band. The bandwidth of the pass band is a function of the line impedance and the coupling capacitance. Band-Pass line tuners are available in 2nd, 3rd, 4th, and 5th order. High-Pass line tuners pass all frequencies above the cut-off frequency, with the available cut-off frequency being a function of the line impedance and the coupling capacitance. Line tuner components are housed in a weatherproof, aluminum cabinet, which is designed to be mounted on the coupling capacitor/CCVT support structure. The cabinet is equipped with a condensation screen and a 10 W, 120/240 V heater. All line tuner components are modular and can be changed, if required. The line tuner components include a protective unit, tuning/filter unit(s), and impedance matching transformer(s). The protective unit includes a ground switch, spark gap, and an optional drain coil. In most applications, the drain coil is included with the carrier accessories of a coupling capacitor or coupling capacitor voltage transformer. It is not necessary to include a drain coil within the line tuner, if one is present with the coupling capacitor or CCVT. It is not advisable to use two drain coils, as the total losses of the carrier system will be increased. The tuning filter modules consist of inductors and capacitors, which vary based on type of tuner. The impedance matching transformer is used to match the impedance of the coaxial cable with the impedance of the power line for efficient coupling, as well as acting to electrically isolate the line side system from the carrier side system. The line side cable connects via a waterproof top entrance bushing or through an optional “U” entrance. Carrier side cable is run through a 1-1/2 inch conduit hub, which is included and plugged for shipment. Refer to our Catalog Section for more information. 
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Power Line Carrier (PLC) uses high-voltage transmission lines as a means of communication between points on a transmission system. AREVA offers a complete line of equipment for PLC applications, including Coupling Capacitor Voltage Transformers, Line Traps, and Line Tuners.