MI 3101 EurotestAT: Measurements
Testing RCD
55
Note:
See
4.4.2 RCD standard
for selection of appropriate standard test conditions.
5.3.3 Trip-out current (RCD I
)
A continuously rising residual current is intended for testing the threshold sensitivity for
RCD trip-out. The instrument increases the test current in small steps through appropriate
range as follows:
Slope range
RCD type
Start value End value
Waveform
AC
0.2
I
N
1.1
I
N
Sine
A (I
N
30 mA)
0.2
I
N
1.5
I
N
A (I
N
= 10 mA)
0.2
I
N
2.2
I
N
Pulsed
B
0.2
I
N
2.2
I
N
DC
Maximum test current is I
(trip-out current) or end value in case the RCD didn’t trip-out.
Trip-out current measurement procedure
Select the
RCD
function.
Set sub-function
Tripout current
.
Set test
parameters
(if necessary).
Connect
test cable to the instrument.
Connect
test leads to the tested object (see
figure 5.13
).
Press the
TEST
key.
After the measurement is finished
store
the result (optional).
Trip-out
After the RCD is turned on again
Figure 5.16: Trip-out current measurement result example
Displayed results:
I .......... Trip-out current,
Uci ...... Contact voltage at trip-out current I or end value in case the RCD didn’t trip,
t .......... Trip-out time.
