3-Phase Measurement (Line-To-Line Voltage) And Phase Sequence; Testing Rcds - Gossen MetraWatt PROFITEST MBASE MTECH Operating Instructions Manual

6.2 3-Phase Measurement (Line-to-Line Voltage) and Phase
Sequence
Connection
The measuring adapter
(2-pole) is required in
order to connect the
instrument, and is
expanded into a 3-pole
measuring adapter with
the included measure-
ment cable.
Ð Press softkey U3~
Clockwise phase sequence is generally required for all 3-phase elec-
trical outlets.
• Measurement instrument connection is usually problematic
with CEE outlets due to contact problems.
Measurements can be executed quickly and reliably wi th out
contact problems with the help of the Z500A variable plug
adapter set available from GMC.
• Connection for 3-wire measurement, plug L1-L2-L3 in
clockwise direction as of PE socket
Direction of rotation is indicated by means of the following
displays:
Clockwise
Note
See section 18.1 regarding all indications for the mains
connection test.
Voltage Polarity
If the installation of single-pole switches to the neutral conductor
is prohibited by the standards, voltage polarity must be tested in
order to assure that all existing single-pole switches are installed
to the phase conductors.
14
7
The testing of residual current devices (RCDs) includes:
• Visual inspection
• Testing
• Measurement
The test instrument is used for testing and measurement.
Measuring Method
The following must be substantiated by generating a fault current
downstream from the RCD:
• That the RCD is tripped no later than upon reaching its nominal
• That the continuously allowable contact voltage value U
This is achieved by means of:
• Contact voltage measurement:
I
------ -
• Substantiation of tripping within 400 ms or 200 ms with I
I
• Substantiation of tripping current with rising residual current,
• N o premature tripping with the test instrument, because testing
RCD/FI Table
Counter-Clockwise
Alternating
current
Pulsating direct
current
Direct current

Testing RCDs

fault current value
agreed upon for the respective system is not exceeded
16 measurements with full-waves and extrapolation of I
N
3
(measurement for up to 1000 ms)
N
t
a
value must be between 50 and 100% of I
70%)
I
a
is begin at 30% residual current (if no biasing current occurs
within the system).
Type of
Differential Current
Suddenly occurring
Slowly rising
Suddenly occurring
Slowly rising
L
N
N
(usually approx.
N
T
Correct RCCB Function
Type AC Type A Type B
4 4 4
4 4
4
GMC-I Messtechnik GmbH