MPI-525
– USER MANUAL
27
Read out the result.
Remarks and information are the same as for I
A
measurement.
3.5.3 Automatic measurement of RCD parameters
The meter enables automatic measurement of the following: RCD trip times (t
A
), trip current (I
A
),
touch voltage (U
B
) and resistance-to-earth (R
E
). Additionally, there is a possibility of automatic meas-
urement of short circuit loop impedance Z
L-PE
RCD in a manner described in point 3.4.3. In the automatic
mode, it is not necessary to actuate a measurement each time by means of
START
push-button. The
operator of the meter only has to initiate a measurement by pressing
START
push-button once and
switch RCD on each time after it is tripped. The below table shows maximum number of parameters
measured and sequence of measurements for preset value of rated current I
n
, selected current wave-
form, type of RCD (standard / selective / short-time delay) and U
L
voltage.
No.
Parameters meas-
ured
Measurement conditions
I
n
multiplica-
tion factor
Initial phase (polarization)
1.
Z
L-PE
2.
U
B
, R
E
3.
t
A
0,5I
n
positive
4.
t
A
0,5I
n
negative
5.*
t
A
1I
n
positive
6.*
t
A
1I
n
negative
7.*
t
A
2I
n
positive
8.*
t
A
2I
n
negative
9.*
t
A
5I
n
positive
10.*
t
A
5I
n
negative
11.*
I
A
positive
12.*
I
A
negative
* points in which an efficient RCD should disconnected
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