Power Electronics NB CITY, Руководство по аппаратному обеспечению и установке

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NB City POWER ELECTRONICS
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PROTECTIONS
PROTECTIONS
The NB City EV charger is equipped with multiple hardware protections. This section describes the different
protections available. The equipment consists of two charging lines, each line will require its own
protections.
Overvoltage protections
As an optional extra, each line can include an AC surge protector type II or type I+II:
OVERVOLTAGE
PROTECTION
Nominal voltage (U
n
) Discharge capacity (I
n
)
IEC – type II 400V
AC
20kA
IEC – type I + II 400V
AC
25kA
US .- type II 230V
AC
20kA
Overcurrent and short circuit protection
The charger has a circuit breaker (MCB) for each hose. Its main features are shown in the following
table:
CIRCUIT BREAKER Type
Nominal
current (I
n
)
Nominal
voltage (U
n
)
Breaking
capacity (kA)
MCB - IEC 4P 40A 400V
AC
6kA
MCB - US 2P 40A 240V
AC
10kA
In addition, the IEC equipment includes a differential switch (RCD) in each line, located in the lower half
of the equipment and whose characteristics are as follows:
DIFFERENTIAL SWITCH Type
Nominal
current (I
n
)
Nominal
voltage (U
n
)
Differential
protection
RCD - IEC Type A / 4P 40A 400V
AC
30mA
The NB City - Professional (IEC) model can include as an option a type A RCD resetting accessory.
Residual current monitoring (RCM)
The NB City - Professional (IEC) equipment includes a residual current monitor (RCM). This element
monitors for any leakage current in excess of the operational limit in the AC charging hose; if detected,
it provides a fault signal that will stop the charge.
Operational limit
RCM 6mA
DC
Charge circuit interrupting device (CCID)
In case of US equipment, those include a charge circuit interrupting device (CCID) for AC charging. This
element monitors all currents between phase and neutral; when applicable, it will provide a fault signal
that will stop the charge. It includes an integrated differential element.
Operational limit
CCID 56mA
DC
/ 20mA
AC
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