29
First measurement on first shaft
:
2-3 measurements to get a valid result (at example above 54,5m)
Insert distance (200m , steps etc.)
Second measurement on second shaft
2-3 measurements to get a valid result
As result the distance to fault from second shaft is displayed. (145,5m)
6.3 Sheath
fault
Today’s customary method to locate sheath faults is the modificated "Wurmbach" procedure.
A impulse sequence (SSG) or a impulse block (STG) is sent to the cable under test.
The voltage drop at the fault location results in a step voltage which is indicated in the UL 20
with help of cable sheath fault sticks. The UL 30 displays via bargraph and an arrow (drag
indicator) the direction to the fault. The drag indicator shows the direction to go until the
next impulse has taken place. Additional to the optical display a accoustic information with
different tone signals is given. Ahead the fault the bargraph indicates zero.
▼
Deflection 0
Right
Left
Acustic
0
Right
Left
Peak hold
Содержание TG 20/50
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