MI 3101 EurotestAT: Appendix E
Reduced low voltage supply systems
112
E.3.1.2 RCD tests
Maximum regular RCD test current is 1 A r.m.s. (1.4 A peak) and can be achieved only
when fault loop impedance is lower than 1
Tests are carried out for both combination L1-PE and
L2-PE automatically.
Each individual test result is accompanied with
appropriate indication.
Figure E.3: RCD Uc test
If input voltage is out of range it is displayed on terminal voltage monitor, together with the
indicator of disabled test
.
E.3.1.3 Line impedance test
Measured impedance represents Line-Line impedance (Z
L1-L2
). Nominal system voltage for
calculation of I
PSC
is set to 110 V.
Nominal system voltage range for line impedance measurement is 90 V to 121 V. If input
voltage is out of range it is displayed on terminal voltage monitor, together with the
indicator of disabled test
.
E.3.1.4 Fault loop impedance tests
Definition of nominal system voltage for calculation of I
PSC
is changed to:
55 V for single-phase center-tap system selected,
63 V for three-phase system selected.
Tests can be carried out for both combination
L1-PE and L2-PE. Each individual test result is
accompanied with appropriate indication.
Figure E.4: Fault loop
impedance
Nominal input voltages are:
(44 V
Uinp < 61 V) for single-phase 55 V system
(56 V
Uinp
70 V) for three-phase 63 V system
If input voltage is out of range it is displayed on terminal voltage monitor, together with the
indicator of disabled test
.
