7.1 Subtransmission line protection
7 Applications
Technical description
236
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VM259.EN007
7.
Applications
The following examples illustrate VAMP 259 functions in most
common applications.
7.1.
Subtransmission line protection
In this application example VAMP 259 line managers are used
in subtransmission application. Protected line is 110 kV and
the length of the line is 40 km. In this example the line is
protected with line differential and distance functions.
Figure 7.1-1 VAMP Line protection devices used in subtransmission line
protection
In between of the two line managers is used optical
communication link which is carried along the power lines in
the overhead line towers. Relays communicate with each other
in 5 ms cycles in which time the measurement data is
transferred and processed in each of the line ends.