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Functional Description
2.1 Introduction to Carrier Frequency Coupling on HV Lines
2.1
Introduction to Carrier Frequency Coupling on HV Lines
The electric-power utilities use their own power lines for secure information transmission. With the aid of
special carrier frequency equipment (PLC equipment) vital telephone calls, data, and teleprotection signals are
safely transmitted independently of other communication networks and frequently over long distances.
In carrier frequency transmission of information over live HV power lines the HF currents of the communica-
tions equipment are fed into or tapped off from the lines at suitable points. Any potential hazard to opera-
tional crew and the communication terminal equipment due to the high voltage must be avoided.
HF traps (coils) are inserted in the HV line to prevent the carrier frequency signal draining away in the wrong
direction or into the high-voltage system. These traps do not offer any significant resistance to energy trans-
port in the HV line. The carrier frequency power is coupled into the HV line via coupling capacitors designed to
withstand the high voltage and tapped off in the same way from the line. The coupling filter, the coupling
protection, the grounding switch, and the isolation transformer are contained in the coupling unit AKE 200.
A high-pass filter circuit has been selected for the AKE 200. This allows transmission in the carrier frequency
band up to 500 kHz provided for PLC from a lower cut-off frequency f
coupling capacitors.
The AKE consists of a basic unit available in different versions to cover all coupling applications that arise in
practice.
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which is determined by the size of the
U
Smart Communication, AKE 200 Coupling Unit, Manual
C53000-G6540-C265-2, Edition 11.2020
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