Chauvin Arnoux C.A 6116, User Manual

Page: 88 / 96

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9. DEfInItIons of syMbols
Here is a list of the symbols used in this document and on the display unit of the device.
3P 3-point earth resistance measurement with 2 auxiliary rods.
AC
AC (Alternating Current) signal.
DC
DC (Direct Current) signal.
Df Distortion Factor = THD-R.
E E terminal (earth electrode, measurement current return terminal).
fft harmonic analysis of a signal (Fast Fourier Transform).
G
selective residual current device, specific to Austria.
H H terminal (measurement current injection terminal in 3P earth measurement).
Hz Hertz: indicates the frequency of the signal.
I current.
I
1
current in phase 1 of a three-phase network.
I
2
current in phase 2 of a three-phase network.
I
3
current in phase 3 of a three-phase network.
I
D
n
assigned operating current of the RCD to be tested.
I
a
RCD tripping current of the residual current device.
Ik short-circuit current between the L and N, L and PE, N and PE, or L and L terminals.
It Type of link to earth defined in standard IEC-60364-6.
I
sEl
current flowing in the earthing resistance to be measured in selective earth measurement on live circuit.
l
L terminal (phase).
l
i
inductance in the L-N or L-L loop.
l
s
inductance in the L-PE loop.
n N terminal (neutral).
j
phase difference of the current with respect to the voltage.
P active power, P = U . I . PF.
PE PE terminal (protective conductor).
Pf power factor (cos j for sinusoidal signal).
PIt
Permanent Insulation Tester.
R
mean resistance calculated from R+ and R-.
R+ resistance measured with a positive current flowing from terminal
W
to terminal COM.
R- resistance measured with a negative current flowing from terminal W to terminal COM.
R± resistance measured alternately with a positive current, then a negative current.
R
D
resistance of the accessories subtracted from the measurement (compensation of the measurement leads).
RCD acronym designating a Residual Current Device.
R
A
earth resistance in earth measurement on live circuit.
R
AsEl
selective earth resistance in selective earth measurement on live circuit.
R
E
earth resistance connected to the E terminal.
R
H
resistance of the rod connected to the H terminal.
R
l-n
resistance in the L-N loop.
R
l-PE
resistance in the L-PE loop.
RMs
Root Mean Square: root-mean-square value of the signal, the square root of the mean of the squares of the signals.
R
n-PE
resistance in the N-PE loop.
R
n
nominal resistance in insulation measurement R
N
= U
N
/1mA.
R
PI
resistance of the auxiliary rod in earth measurement on live circuit.
R
PE
resistance of protective conductor PE.
R
s
resistance of the rod connected to the S terminal.
s terminal S (acquisition of measurement potential for the earth resistance calculation).
S
selective residual current device.
t
A
effective trip time of the residual current device.
tHD-f level of harmonic distortion referred to the fundamental.