IMP57
EN - 17
6.2.
OPERATING INSTRUMENT FOR “TYPE 2” INSTRUMENT
Operating Instruction are given according to
Table 1 - Instrument Type
definition.
6.2.1. Instrument Settings
Select
LOOP
rotary switch position.
Select one of the following connection by means
FUNC
button.
"
P-P
", "
P-N
", "
P-PE
"
available among the functions "P-P", "P-N", "P-PE", " R
A
", "
".
Press
Un/I
Δ
n
to enable the "High Resolution Measurement
Z2
" working
mode. correspondently the
LOW
and
LOOP
symbols will be displayed in
the lower part of the display.
When
Z2
working mode is enabled it's possible to select one of the
following measurement mode by means the
FUNC
button.
“
P-N
"
The instrument execute the High Resolution Phase-Neutral
impedance measurement and calculate the Prospective Short
circuit Current.
“
P-P
" (The instrument execute the High Resolution Phase-Phasel
impedance measurement and calculate the Prospective Short
circuit Current.
“
P-PE
"
The instrument execute the High Resolution Phase-ground
impedance measurement and calculate the Prospective Short
circuit Current.
Press
Un/I
Δ
n
button to quit High Resolution Measurement mode
Z2
.
6.2.2. Prospective Short Circuit Current Calculation
Independently by the connection selected, the instrument calculated the Prospective short
circuit current as:
MIS
NOM
STD
Z
U
I
Standard Prospective Short Circuit current
where
Voltage U
NOM
230V-10% < Vmeasured < 230V+ 10%
230V
230V+10% < Vmeasured < 400V- 10%
Vmeasured
400V-10% < Vmeasured < 400V+ 10%
400V
