Manual

50 Gossen Metrawatt GmbH
12.3.3 SRCD, PRCD-S (SCHUKOMAT, SIDOS or comparable)
RCCBs from the SCHUKOMAT SIDOS series, as well as others
which are of identical electrical design, must be tested after
selecting the corresponding parameter.
Monitoring of the PE conductor is performed for RCDs of this
type. The PE conductor is monitored by the summation current
transformer. If residual current flows from L to PE, tripping current
is cut in half, i.e. the RCCB must be tripped at 50% nominal resid-
ual current I
N
.
Whether or not PRCDs and selective RCDs are of like design can
be tested by means of touch voltage U
IN
measurement. If a
touch voltage U
IN
of greater than 70 V is measured at the PRCD
of an otherwise error-free system, the PRCD more than likely con-
tains a non-linear element.
PRCD-S
The PRCD-S (portable residual current device – safety) is a spe-
cial, portable, protective device with protective conductor detec-
tion or protective conductor monitoring. The device serves to pro-
tect persons from electrical accidents in the low-voltage range
(130 to 1000 V). The PRCD-S must be suitable for commercial
use, and is installed like an extension cable between an electrical
consumer – as a rule an electrical tool – and the electrical outlet.
Select Measuring Function
Set Parameter – SRCD / PRCD
Start Measurement
12.3.4 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 which complies with
device standard ÖVE/ÖNORM E 8601. 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)
Touch 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 × 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 Parameter – Start with Positive or Negative Half-Wave
I
N
I
F
or
Type 1:
I
N
Type 1:
Waveform:
Negative direct current
Positive direct current
180°: Start with neg. half-wave
0°: Start with pos. half-wave