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Gossen Metrawatt PROFITEST MXTRA Manual

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28 GMC-I Messtechnik GmbH
The measured value can only be saved after it has been evalu-
ated.
8.3 Settings for Short-circuit current Calculation – Parameter I
K
Short-circuit current I
K
is used to test shutdown by means of an
overcurrent protective device. In order for an overcurrent protec-
tive device to be tripped on time, short-circuit current I
K
must be
greater than tripping current Ia (see table 6 in section 21.1). The
variants which can be selected with the “Limits” key have the fol-
lowing meanings:
I
K
: Ia The measured value displayed for I
K
is used without
any correction to calculate Z
L-PE
.
I
K
: Ia+% The measured value displayed for Z
L-PE
is corrected
by an amount equal to the test instrument’s measuring
uncertainty in order to calculate I
K
.
I
K
: 2/3 Z In order to calculate I
K
, the measured value displayed
for Z
L-PE
is corrected by an amount corresponding to
all possible deviations (these are defined in detail by
VDE 0100, part 600, as Z
s(m)
2/3 x U
0
/Ia).
I
K
: 3/4 Z Z
s(m)
3/4 x U
0
/Ia
I
K
Short-circuit current calculated by the instrument (at nominal
voltage)
Z Fault loop impedance
Ia Tripping current
(see data sheets for circuit breakers / fuses)
%
Test instrument intrinsic error
Special Case I
k
> I
kmax
see page 29.
9 Measuring Line Impedance (Z
L-N
function)
Measuring Method (internal line resistance measurement)
Supply impedance Z
L-N
is measured by means of the same
method used for loop impedance Z
L-PE
(see section 8 on page
26). However, the current loop is completed via neutral conductor
N rather than protective conductor PE as is the case with loop
impedance measurement.
Select Measuring Function
Connection:
Schuko / 3-Pole Adapter
Connection:
2-Pole Adapter
Set Parameters
Press the softkey shown at the left in order to switch
back and forth between the country-specific plug
insert, e.g. SCHUKO / 3-pole adapter, and 2-pole
adapter. The selected connection type is displayed
inversely (white on black).
Limit value:
I
K
< limit value
U
L
R
L
Z
L-N
Nominal current:
Diameter: 1.5 to 70 sq. mm
Cable types: NY..., H03... - H07...
Number of wires: 2 ... 10-strand
2 ... 160 A, 9999 A
Tripping characteristics:
A, B/L, C/G, D, E, H, K, GL/GG & Factor
… 28 …

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