Sonel MPI-520 - Automatic Measurement of RCD Parameters

MPI-520 OPERATING MANUAL version 3.4
27
Read out the result.
Remarks and information are the same as for I
A
measurement.
3.6.3 Automatic measurement of RCD parameters
The meter enables automatic measurement of the following: RCD disconnection times (t
A
), dis-
connection current (I
A
), touch voltage (U
B
) and resistance-to-earth (R
E
). Additionally, there is a possi-
bility of automatic measurement 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 triggered. The below table shows
maximum number of parameters measured and sequence of measurements for preset value of rated
current I
n
, selected current waveform, 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
Set the rotary switch of function selection at
AUTO position.