Gx
Series
EN - 40
The following table summarizes the possible measures executable depending on the type of
system (TT, TN and IT), of selected modes and the relationships that define limit values
TT
TN
IT
Mode
Condition x OK outcome
Condition x OK outcome
Condition x OK outcome
L-L
STD
No outcome
No outcome
No outcome
kA
Isc L-L max < BC
Isc L-L max < BC
Isc L-L max < BC
I
2
t
(Isc L-L 3F)
2
* t < (K * S)
2
(Isc
L-L3F)
2
* t < (K * S)
2
(Isc
L-L3F)
2
* t < (K * S)
2
(IscL-Lmin 2F)
Tmax
Tmax < Tlim (IscL-L min 2F)
Tmax
Tmax < Tlim
(IscL-Lmin 2F)
Tmax
Tmax <
Tlim
L-N
STD
No outcome
No outcome
No outcome
kA
Isc L-N max < BC
Isc L-N max < BC
Isc L-N max < BC
I
2
t
(Isc L-N)
2
* t < (K * S)
2
(Isc
L-N)
2
* t < (K * S)
2
(Isc
L-N)
2
* t < (K * S)
2
(Isc L-N min )
Tmax
Tmax < Tlim
(Isc L-N min )
Tmax
Tmax < Tlim (Isc L-N min )
Tmax
Tmax < Tlim
L-PE
STD
No
outcome
kA
Isc L-PE max< BC
I
2
t
(Isc
L-PE)
2
* t < (K * S)
2
(Isc L-PE min )
Tmax
Tmax <
Tlim
Tlim
Ia
Isc L-PE MIN > Ia
Utmeas < Utlim
NoTrip
(No for
IMP57)
STD
kA
I
2
t
Isc L-PE MIN > Idn (RCD)
Isc L-PE MIN > Idn (UK, AUS/NZ)
ZL-PE < ZLimit (UK, AUS/NZ)
Ipfc with Trip time < Trip time limit
(other countries)
Table 2: Conditions of positive outcome depending on the test parameters
Where:
Empty cells
Not available mode for this particular combination of electric system
Isc L-L_3F
Prospective short circuit current three-phase Phase-Phase (see § 13.5)
Isc L-L_Min2F Prospective short circuit current minimum two-phase Phase-Phase (see § 13.10)
Isc L-N_Max
Prospective short circuit current maximum Phase-Neutral (see § 13.5)
Isc L-N_Min
Prospective short circuit current minimum Phase-Neutral (see § 13.10)
Isc L-PE_Max Prospective short circuit current maximum Phase-PE (see § 13.5)
Isc L-PE_Min
Prospective short circuit current minimum Phase-PE (see § 13.10)
BC
Breaking Capacity of the protection device - kA)
K
Constant relative to the I2t measurement (vedere § 13.11)
Z Limit
Max allowed limit impedance compliance with type of protection (see § 13.7)
S
Section of conductor
Tmax
Maximum trip out time of the protection device
Tlim
Limit time of fault extinction by the protection set by the user
Ut meas
Contact voltage measured
Ut lim
Contact voltage limit (25V or 50V)
Ra meas
Global earth resistance measured
Idn
Trip out current of RCD devices
Ipfc
Prospective fault current