61
Pressing the
or
key once more causes a return to the initial display.
Parameters accessible in selective earth measurement in live condition, mode (high
current):
Initial
display
(1
st
press)
(2
nd
press)
(3
rd
press)
(4
th
press)
Initial display
R
E
Z
E SEL
- - - -
I
SEL
H
Z
U
LN
R
L ALARM
U
F
R
∆
L
U
L
(1
st
press)
R
E
Z
E SEL
- - - -
I
SEL
H
Z
U
LPE
R
L ALARM
U
F
R
∆
PE
U
L
(2
nd
press)
R
E
Z
E SEL
- - - -
I
SEL
H
Z
U
NPE
R
L ALARM
U
F
R
∆
N
U
L
(3
rd
press)
R
E
Z
E SEL
- - - -
I
SEL
H
Z
U
P
R
L ALARM
U
F
R
P
U
L
Pressing the
or
key once more causes a return to the initial display.
4.2.5 CHARACTERISTICS
4.2.5.1
MEASUREMENT RANGES AND ACCURACY
Particular reference
conditions
: nominal voltage of the installation = 90 to 550 V,
nominal frequency of use = 15.3 to 65 Hz,
resistance in series with voltage probe: < 100
Ω
,
inductive part < 0.1 x the resistive part of the impedance measured,
resistance of the cable connected to terminal PE corrected,
contact voltage < 5V (potential of terminal PE with respect to the local earth).
Characteristics of the measurements:
Characteristics in "high current" mode ("tripping" mode
):
Charge duration : 300µs cycle
Display range
40
Ω
400
Ω
4000
Ω
Specified
measurement
domain
0.20 – 1.99
Ω
2.00-19.99
Ω
20.00–39.99
Ω
40.0–399.9
Ω
400–3999
Ω
Peak measuring
current between
90V and 280V
1.06 to 3.25 A 0.90 to 3.25 A 0.79 to 2.83 A 0.24 to 2.47 A 0.03 to 0.76 A
Peak measuring
current between
280V and 550V
1.27 to 2.73 A 1.20 to 2.71 A 1.13 to 2.57 A 0.55 to 2.42 A 0.08 to 1.18 A
Accuracy of the
impedance
measurement
± 10% ± 7 pt
± 5% ± 7 pt
± 5% ± 5 pt
± 5% ± 2 pt
Additional error
for Rearth
± 0,3
Ω
MORE
MORE
MORE
MORE
MORE
MORE
Summary of Contents for C.A 6454
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