LEM A188506510, Руководство по эксплуатации

Страница: 38 / 66

36
Measuring process:
Turn central rotary switch to position ” RE 3pole" or ” RE 4pole "
The instrument is to be wired according to picture and notices given on the
display.
A flashing of the sockets symbols or , points to an incorrect or
incomplete connection of the measuring lead.
Apply current transformer to the pylon stub. Make sure that the transformation ratio
set on the instrument corresponds to the current transformer used. Change settings if
necessary (see 8.7)
Press ”START" button
Now a fully automated test sequence of all relevant parameters like auxiliary earth
electrode, probe- and earth electrode resistance, is implemented and finishes with
the display of the result RE.
Read out measured value RE
Call RS and RH with ”DISPLAY" .
Notices for the setting of earth spikes:
Before setting the earth spikes for probe and auxiliary earth electrode make sure that
the probe is set outside the potential gradient of earth electrode and auxiliary earth
electrode (see also 12.5). Such a condition is normally reached by allowing a
distance of >20m between the earth electrode and the earth spikes as well as to the
earth spikes to each other. An accuracy test of the results is made with another
measurement after repositioning of auxiliary earth electrode or probe. If the result is
the same, the distance is sufficient. If the measured value changes, probe or auxiliary
earth electrode must be repositioned until the measured value RE remains constant.
Spike wires should not run too close.