Manual

92 Gossen Metrawatt GmbH
19.10 PRCD – Test Sequences for Documenting Fault Simula-
tions at PRCDs with the PROFITEST PRCD Adapter (PROFIT-
EST MXTRA only)
The PROFITEST PRCD test adapter can be used in combination
with the test instrument.
Attention!
!
Read the respective operating instructions before using
the PROFITEST PRCD.
Measurements with the PROFITEST PRCD connected to the test
instrument:
• Measurement of the PRCD’s insulation resistance using the
test instrument’s R
INS
function (see section 16).
• Measurement of the PRCD’s protective conductor resistance
using the test instrument’s R
LO
function. Please note that the
protective conductor measurement is a modified RLO mea-
surement with ramp sequence for PRCDs (seesection 17).
• Tripping test with nominal residual current using the test
instrument’s I
F
function (see section 12.3).
• Measurement of time to trip using the test instrument’s I
N
function (see section 12.3).
• Varistor test for PRCD-K: measurement via ISO ramp (see
section 16).
Testing performed by simulating faults is carried out without con-
nection to the test instrument, but it’s accompanied and docu-
mented by the test instrument. The test sequence is opened in
the test instrument to this end and the specified steps are exe-
cuted at the PROFITEST PRCD. Afterwards, evaluation and
assessment of each test step (OK or not OK) is performed at the
test instrument for later documentation.
There are three preset test sequences:
– PRCD-S (single-phase / 3-pole): 11 test steps
– PRCD-K (single-phase / 3-pole): 4 test steps
– PRCD-S (3-phase / 5-pole): 18 test steps
19.10.1 Fault Simulation
The procedure for the PROFITEST PRCD, including the proce-
dure with the device under test, is described in the operating
instructions for the PROFITEST PRCD. This section describes the
procedure for the test instrument.
Procedure
➭ Prepare error simulation at the PROFITEST PRCD. Refer to
the operating instructions for the PROFITEST PRCD.
➭ Select the test sequence at the test instrument.
➭ Execute each of the test sequence steps at the PROFITEST
PRCD and document evaluation and assessment at the test
instrument.
Select the PRCD to be Tested
Interaction Between PROFITEST PRCD and Test Instrument
The test steps are displayed at the test instrument. Their mean-
ings and the associated switch positions at the PROFITEST
PRCD are listed in the above table.
Switch
Position
at
PROFIT-
EST PRCD
Display at
Test Instrument
Meaning
Test Step Icon
ON 1~ON
Single-phase PRCD activated
ON 3~ON
3-phase PRCD activated
BREAK Lx
Interrupted phase
Lx <-> PE
Lx <-> N
Wires reversed between phase
conductor and PE or neutral
conductor
PE-U
EXT
Uext -> PE
PE to phase
PROBE
Contact ON key on PRCD with
probe
PRCD-Ip
Protective conductor current
measurement
with current clamp transformer
—AUTOAUTO
Semi-automatic change of
fault simulations