Test Dof Residual Current Devices - Chauvin Arnoux C.A 6030 Manual De Instrucciones

4.2 TEST OF RESIDUAL CURRENT DEVICES
This function is used to test the correct dimensioning of the residual current devices and their correct
operation.
Two test modes are possible:
test without triggering (see §4.2.1) :
=> The instrument performs only a loop measurement (or live ground measurement if the
voltage probe is connected)
test with triggering (see § 4.2.2) :
=> In this case, the instrument performs, in order:
- a test without triggering,
- a non-tripping test
- a tripping test, with measurement of the time to tripping if the "pulse" mode is selected
or measurement of the time to tripping and of the effective tripping current if the
"sweep" mode is selected.
4.2.1 Test without triggering - loop / live ground
4.2.1.1 Description of the function
Loop measurement:
The measurement of loop impedance LPE is a fast and practical way to check a ground resistance
without placing an auxiliary rod. The measurement in this case includes the ground resistance of the
power supply transformer of the installation and the resistance of the distribution cables. It therefore
overestimates the ground resistance, and errs in the direction of safety.
In TT and TN networks, this function is also used to check and dimension protection systems in place
by a fast and easy measurement of the loop impedances between L and PE, L and N, and N and PE.
This function also allows calculation of the corresponding short-circuit current (dimensioning of fuses
and circuit-breakers).
When the key is pressed, the instrument :
TEST
- checks that the amplitude and frequency of the voltages present (U
- generates a current (determined by the user : see § 4.2.1.2) between the L and PE terminals,
- measures the voltage between the
- measures loop impedance Z
- calculates the fault voltage in the event of a short-circuit, U
Live ground measurement :
The selective ground measurement is not available on this instrument.
When the key is pressed, the instrument :
TEST
- checks that the amplitude and frequency of the voltages present (U
- detects the connection of the voltage probe,
- checks its resistance,
- measures the voltage between the
If these quantities are correct, the instrument generates, at the user's choice, a current "I.ntP" between
0.1 x I (≥ 3mA) and 0.5 x I
∆N
of the switch), and measures the voltage drop between the P and PE terminals.
4.2.1.2 Preparation of the measurement (connection)
The instrument must be connected to the network in a live condition and the earth electrode
to be measured must not be disconnected.
key and the PE terminal,
TEST
(loop) or R (live ground),
LN E
key and the PE terminal.
TEST
(I corresponding to the nominal rating of the RCD, chosen by the position
∆N ∆N
57
) are correct,
LN
.
F
) are correct,
LN