Power Electronics Standalone NB 120 - PROTECTIONS; INSULATION AND OVERCURRENT PROTECTION; OVERVOLTAGE AND RESIDUAL CURRENT PROTECTION

NB 120
POWER ELECTRONICS
44
PROTECTIONS
PROTECTIONS
The charger is equipped with multiple hardware protections. This section describes the different protections
available to the equipment.
Insulation monitoring
The equipment has an insulation monitor to detect possible insulation faults in DC charge.
Overcurrent and short circuit protection
The equipment includes other protections for each charge line with following characteristics:
Type
Nominal
current (I
n
)
Nominal
voltage (U
n
)
Breaking
capacity (kA)
DC charge line 30 kW
3-phases
63 A
480 V
AC
6 kA
AC charge line (only in IEC)
3-phases + N
40 A
400 V
AC
10 kA
Auxiliaries
2P
10 A
480 V
AC
10 kA
Overvoltage protection (optional)
The equipment can include as optional an AC overvoltage protection type II, located in the main control
cabinet.
OVERVOLTAGE
PROTECTION
Nominal voltage (U
n
)
Discharge capacity (I
n
)
NB120 – Type II
400 V
AC
20kA
NB120 – Type II (only in US)
480 V
AC
20kA
Residual current protections (RCD) (optional)
The equipment can optionally include a type A differential relay. This element monitors for any current
leakage above the operational limit.
Operational limit
RCD
0,03 – 40 A
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