Line Traps
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Line Traps

Line Traps With over 40 years of successful field experience Trench is the reco- gnized world leader in the core dry-type inductors for electric utility applications. The unique custom design approach, along with fully integrated engineering both North America and Europe have enabled Trench to become the technical leader for high voltage inductors world wide. Line Traps for Power Line Carrier present a significant application segment for high voltage Basic Function of Line Traps Power Line Carrier (PLC) is a common method of Power System Communication, such as telepro- tection, voice and...

Line Traps are designed to meet ANSI standard C93.3, IEC stan- dard 60353 or other international The major components of a Line Trap are the main coil, tuning device and protective device Since Line Traps are series connec- ted with the HV transmission line, they must be designed to with- stand the high mechanical forces generated by the short circuit (s/c) current associated with the HV transmission system. Bird Barrier (Optional) Suspension mounted Line Traps Line Trap Line Trap Line Trap

Main Coil The main coil of a Line Trap is an air-core dry-type power inductor. Trench offers Line Traps with en- capsulated design. This technology fully complies with power system and PLC plied over the full range of com- monly specified main coil ratings The winding utilizes aluminum wire or cable. All power current carrying components utilize welded connections. High mechanical strength of the winding is achieved by resin im- pregnated, fiberglass reinforced The winding is terminated at both ends on a system of aluminum bars, denoted as the spiders which are tensioned together by fiber-...

Rated Currents Rated Inductance current, short time current Rated Currents Rated Inductance

Single frequency tuning Tuning Device The tuning device, connected across the main coil, forms a blocking circuit which provides high impedance over a specified PLC-frequency range. Depending on the type of tuning (see below) the tuning device consists of capacitors, inductors and resistors, all having relatively low power ratings, compared to the main coil. For environmental protection these components are mounted in one or more fiberglass housings. The tuning device is installed inside the main coil. To meet changing PLC frequency requirements the tuning device is easily accessible for...

• Wideband Tuning Wideband tuning is the most common type of tuning as it efficiently utilizes the main coil inductance. Wideband tuned Line Traps are suitable for multi-chan- nel applications, since relatively constant impedance is obtained over a broad frequency range. This type of tuning provides high band- width flexibility for future changes anywhere within the blocked Fig.8 shows a typical wideband frequency Line Trap schematic and blocking characteristic. • Selftuned Line Traps Selftuned Line Traps do not require blocking characteristic as shown in Fig. 10 is achieved by simply...

Protective Device The protective device is a surge arrester connected in parallel with the main coil and the tuning device. It protects the main coil and the tuning device by reducing the transient overvoltages to levels voltage class insulation. The insulation level of the main coil and tuning device is coordinated with the surge arrester protective Trench Line Traps are equipped with advanced metal-oxide type surge arresters having a discharge current rating of 10kA. Surge arresters with higher discharge current or high energy dissipation arrangements are also available on specific...

Side view Terminal orientation (by special request may be situated Number of spider arms is obtained from actual quotation drawing, terminal location, at centre or at Eb: is used to define the bottom terminal location; at centre or at Standard terminal types plated or bare aluminum Unless otherwise specified, flat terminal pads will be vertically oriented to reduce eddy current heating, (ie. terminals oriented so that the coil's axis is in the plane

Line Trap is dependent on the transmission line where Power Line Carrier is to be applied. The Line Trap blocking characteristics the complete Line Trap within a specified PLC frequency range. impedance, within a specified At, also known as «Insertion Loss», is a measure of the loss of power sustained by a carrier finite blocking ability of the Line Trap. The tapping loss of an ideal Line Trap should be very transmitted carrier frequency signal which enters the trapped circuit section of network. The blocking attenuation of an ideal Line Trap should be infinitely Calculation of tapping loss...

0,2 imH Line Trap 0,315 mH Line Trap wide band blocking range for 0,2 mH Line Traps wide band blockin9 range for 0,315 mH Line Traps

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