Chauvin Arnoux C.A 6454 Notice De Fonctionnement page 67

- if no tripping of a earth fault breaker is foreseen (measurement made upstream of the
RCDs),
- if the earth fault breaker concerned is short-circuited for greater accuracy,
→ low (
The connection diagrams are the same as for earth measurements in a live condition, but without the
voltage or current probe (see § 4.2.2).
4.3.3 MEASUREMENT PROCEDURE
The instrument first checks the resistance of the rod and measures the voltage between PE and
earth, then measures voltages U
If these values are correct, pressing the TEST key starts the measurement: as soon as the result is
available, it is displayed.
Note: for measurements on three-phase systems, the loop impedance must be measured between
each phase conductor, the neutral conductor, and the protective conductor.
4.3.4 MEASUREMENT RESULTS
After the measurement, the measured values and complementary results can be consulted using
MORE
the and
(The quantities accessible before the measurement is made are described above, in § 4.1.4.)
Initial display
st
(1 press)
nd
(2 press)
Pressing the or
Note : In non-trip mode the inductive component is not measurable due to the weak test current. The
values L , L , Z
LPE NPE
L field.
LN
4.3.5 CHARACTERISTICS
4.3.5.1 MEASUREMENT RANGES AND ACCURACY
Particular
reference conditions
) otherwise for a rapid check
, U , U
LN LPE
keys.
Initial
MORE
display
st
(1 press)
R L
LPE LPE
Z Z
LPE LPE
R L
LN LN
Z Z
LN LN
R L
NPE NPE
Z Z
NPE NPE
MORE
key once more causes a return to the initial display.
are not displayed (display shows - - - -). The value L
NPE,
: nominal voltage of the installation = 90 to 550V,
nominal frequency of use = 15.3 to 65Hz,
inductive part < 0.1 x the resistive part of the impedance measured.
.
NPE
MORE
nd
(2 press) (3
U
REF
I
KLPE
U
REF
I
KLN
U
REF
I
KNPE
66
MORE MORE
rd th
press) (4 press)
H - - -
Z
U Z
LPE L ALARM
H - - -
Z
U Z
LN L ALARM
H - - -
Z
U Z
NPE L ALARM
is displayed in the
LPE
MORE
th
(5 press)
R
∆
PE
U
L
R
∆
L
U
L
R
∆
N
U
L