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transmission lines

transmission lines

transmission lines

(OP)
What causes sparks when one opens an isolator of a line that is not loaded

RE: transmission lines

No energized line is ever truly "not loaded".  There will be line charging currents flowing.  Line length, voltage, line geometry all enter into the picture.  The lower the voltage and the shorter the line the lower the charging current.

RE: transmission lines

The spark in disconnect switches is usually caused for the capacitive trapped charge in the system. To minimize this effect, many disconnect switches are specified with arching horn.
The enclose picture copied from in the net is a good example of the problem described above.

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