20 GMC-I Messtechnik GmbH
Measuring Method
The following can be measured, depending upon the measuring
method:
• Time to trip t
A
: tripping test with nominal residual current I
N
(the PRCD-K must trip at half the nominal current)
• Tripping current I
: testing with rising residual current I
F
Select the Measuring Function
Connection
Set Parameters – PRCD with Non-Linear Elements
Start Measurement
7.3.3 SRCDs, 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
residual current I
N
.
Whether or not PRCDs and selective RCDs are of like design can
be tested by measuring contact voltage U
IN
. If a contact voltage
U
IN
of greater than 70 V is measured at the PRCD of an
otherwise error-free system, the PRCD more than likely contains a
non-linear element.
PRCD-S
PRCD-S (Portable Residual Current Device – Safety) is a special
portable protective system with protective conductor recognition
and/or monitoring. The device serves to protect persons from
electrical accidents in the low voltage range (130 ... 1000 V). The
PRCD-S must be suited for industrial applications and is installed
like an extension cable between an electrical consumer – usually
an electric tool – and a mains socket.
Select the Measuring Function
Set Parameters – SRCD / PRCD
Start Measurement
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