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Gossen Metrawatt PROFITEST MXTRA Manual

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24 GMC-I Messtechnik GmbH
7.3.4 Type G or R RCCB
In addition to standard RCCBs and selective RCDs, the special
characteristics of the type G RCCB can also be tested with the
test instrument.
The type G RCCB is an Austrian specialty and complies with the
ÖVE/ÖNORM E 8601 device standard. Erroneous tripping is min-
imized thanks to its greater current carrying capacity and short-
term delay.
Select Measuring Function
Set Parameter – Type G/R (VSK)
Contact voltage and time to trip can be measured in the G/R-
RCD switch position.
Note
It must be observed that time to trip for type G RCCBs
may be as long as 1000 ms when measurement is made
at nominal residual current. Set the limit value corre-
spondingly.
➭ Then select 5 x I
N
in the menu (this is selected automatically
for the G/R setting) and repeat the tripping test beginning with
the positive half-wave at 0° and the negative half-wave at
180°. The longer of the two tripping times is decisive regard-
ing the condition of the tested RCCB.
Set the Parameter – Start with Positive or Negative Half-Wave
Set the Parameter – 5 Times Nominal Current
Note
The following restrictions apply to the selection of
tripping current multiples relative to nominal current:
500 mA: 1 x, 2 x I
N
Start Measurement
In both cases, tripping time must be between 10 ms (minimum
delay time for type G RCCBs!) and 40 ms.
Type G RCCBs with other nominal residual current values must
be tested with the corresponding parameter setting under menu
item I
N
. In this case as well, the limit value must be appropriately
adjusted.
Note
The RCD parameter setting for selective RCCBs is not
suitable for type G RCCBs.
I
N
Type 1:
180°: Start with neg. half-wave
0°: Start with pos. half-wave
Waveform:
Negative direct current
Positive direct current
X times tripping current:
5 times tripping current
S
… 24 …


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