HT instruments SIRIUS87 - Manual (Page 29)

SIRIUS 87
EN - 27
4.3.1.4. Mode "RAMP "
4.
 Press the START/STOP key once. The instrument carries out the
test injecting a current in phase with positive half wave of the
voltage indicated on
display by 0°.
 Press the START/STOP key once. The instrument carries out the
test injecting a current in phase with negative half wave of the
voltage indicated on
display by 180°.
The instrument generates a leakage current growing step by step
for a given time interval.
 At the end of the test if the RCD tripping
current is
 I
n (Type AC) or 1.4I n (Type
A with I n > 10mA) or 2I n (Type A with
I
n
 10mA), the instrument emits a
double sound signal indicating the
positive outcome of the test and
displays the screen alongside.
RCD
~

24
mA
OK
41
m
s 1 V
 t
0° U
L
= 50 V
SAVING:
The test can be stored pressing the
SAVE key twice
(according to § 5.1).
If the parameters set on the instrument are consistent with the kind of RCD under test
(and if the latter works properly) the ramp test “ ”
SHALL CAUSE THE RCD TRIPPING
WITH A CURRENT LOWER THAN OR EQUAL TO THE SELECTED RATED
DIFFERENTIAL CURRENT. This test is not used to be effected to compare the RCD
tripping time at the tripping current, while the standards refer to the maximum tripping
times in case the RCD is checked with a leakage current equal to the rated current.
SAVE
RCD tripping time
OK: indicates that
the RCD passed
the test.
Value of contact voltage U
t
detected referred to the
rated value of the RCD current set.
or RCD
START
STOP