Manual

Gossen Metrawatt GmbH 47
12.2.2 Testing Systems and RCCBs with Rising Residual Current
(AC) for Type B/B+ and EV/MI RCDs (PROFITEST
MTECH+PROFITEST MXTRA)
In accordance with IEC 61557 / EN 61557, it must be substanti-
ated that, with smooth direct current, residual operating current is
no more than twice the value of rated residual current I
N
. A con-
tinuously rising direct current, beginning with 0.2 times rated
residual current I
N
, must be applied to this end. If current rise is
linear, rising current may not exceed twice the value of I
N
within a
period of 5 seconds.
Testing with smoothed direct current must be possible in both
test current directions.
12.2.3 Testing RCCBS with 5 × I
N
Measurement of time to trip is performed here with 5 times nomi-
nal residual current.
Note
Measurements performed with 5 times nominal fault cur-
rent are required for testing type and G RCCBs in the
manufacturing process. They’re used for personal safety
as well.
Measurement can be started with the positive half-wave at “0°” or
with the negative half-wave at “180°”.
Both measurements must nevertheless be performed. The longer
of the two tripping times is decisive regarding the condition of the
tested RCCB. Both values must be less than 40 ms.
Select Measuring Function
Set Parameter – Start with Positive or Negative Half-Wave
Set Parameter – 5 Times Nominal Current
Note
The following restrictions apply to the selection of
tripping current multiples relative to nominal current:
500 mA: 1 × I
N
, 2 × I
N
Start Measurement
S
I
N
Negative direct current
Positive direct current
Waveform:
180°: Start with neg. half-wave
0°: Start with pos. half-wave
5 times tripping current
X times tripping current: