MI 3108 EurotestPV
Measurements
– a.c. LV installations
52
5.6 Testing RCDs
Various test and measurements are required for verification of RCD(s) in RCD protected
installations. Measurements are based on the BS EN 61557-6 standard.
The following measurements and tests (sub-functions) can be performed:
Contact voltage,
Trip-out time,
Trip-out current,
RCD autotest.
See chapter 4.2 Function selection for instructions
on key functionality.
Figure 5.21: RCD test
Test parameters for RCD test and measurement
TEST
RCD
sub-function
test [RCDt, RCD I, AUTO, Uc].
I
N
Rated
RCD residual current sensitivity I
N
[10 mA, 30 mA, 100 mA, 300 mA,
500 mA, 1000 mA].
type
RCD
type
AC, A, F, B, B+,
starting
polarity
[
,
,
,
,
,
],
selective
S
or
general
characteristic
.
MUL
Multiplication
factor for test current
[½, 1, 2, 5 I
N
].
Ulim
Conventional touch
voltage
limit
[25 V, 50 V].
Notes
:
Ulim can be selected in the Uc sub-function only.
Selective (time delayed) RCDs have delayed response characteristics. As the
contact voltage pre-test or other RCD tests influence the time delayed RCD it takes
a certain period to recover into normal state. Therefore a time delay of 30 s is
inserted before performing trip-out test by default.
Connections for testing RCD
Figure 5.22: Connecting the plug cable and the 3-wire test lead
