ULS-P Line matching unit tunable

TU U 31.2-32431587-002:2010

Device description

The ULS-P linear matching device, together with coupling capacitors or capacitive voltage transformers, is a circuit of a transformer band-pass filter (PF) or a high-pass filter (HPF), which ensures matching of the wave impedance of high-frequency subscriber equipment and an RF communication channel formed by high-voltage wires, cables, ground wires in the nominal frequency band.

"ULS-P" is designed to work on power lines with voltage from 24 to 750 kV and lightning protection cables.

The main feature of "ULS-P" is the possibility of its restructuring at the facility when changing the connection capacity and / or operating frequency range.

"ULS-P" is capable of solving problems that are currently being solved by connection filters "LMU5000" (Areva T&D, France), BLM (TesmecS.p.A, Italy), UAPA-1 (ZIV, Spain), MCD80 (ABB Ltd., Germany), SCA/SGA (SeltaS.p.A., Italy) and others for a similar purpose. It is manufactured on a modern technical basis, taking into account development trends and the needs of the energy industry. Transformers are made on modern high-quality ferrite cores.

ULS-P are designed for RF signal power of at least 200 W.

Connection filter options



Connection diagram

"phase - earth", "phase - phase", "two phases - earth"

Frequency range

24 – 1000 kHz with configurable subbands

Connection capacity

2 – 14 nF (2000 – 14000 pF)

Nominal resistance on the overhead line side

180 – 450 Ohm

Nominal resistance on HF cable side

75 Ohm

Total passband attenuation

<2 dB

Passband Reflection Fade

> 12 dB

Rated power (RES)


Distortion and Intermodulation

80 dB below DER level (IEC 481, cls. 9.6)


3rd order high pass filter; 2nd order bandpass filter

Environmental characteristics

- 40°С…+70°С with air humidity not more than 95% (IEC 870-2-2, class C3)


430x400x190 mm

Weight, no more

10 kg