Electrical Protection Devices - Siemens SICHARGE D Operating Instructions Manual

3.9

Electrical protection devices

Lightning protection and overvoltage protection
The installed surge protection devices (SPD) comply with the relevant product standards
IEC 61643‑1 and ‑11. This means that the charging station only protects itself and not any
peripherals. When the option of extended lightning and overvoltage protection is selected,
the Ethernet and DC cables to the dispenser are also protected.
The SPDs in the electrical supply cables and communication cables protect against transient
interference. To prevent device defects, the power electronics are switched off in these cases:
• In the case of undervoltage
• In the case of overvoltage
• If low limits are violated
• If high limits are violated
NOTE
The planner decides whether to use the "advanced lightning and overvoltage protection"
option in combination with a dispenser. Siemens is not responsible for this decision.
• To do this, prepare a risk evaluation in accordance with IEC 62305
Overload protection
At the AC power input, the circuit breaker provides short-circuit and overload protection for
the charging station. Electric vehicles are supplied with power either via the converters (DC
fast charging) or directly via the AC line connection (AC charging).
Each converter is intrinsically safe in accordance with IEC 62477‑1 and has multiple protective
mechanisms at its interfaces.
The AC charging outlet is protected for the maximum charging power of 22 kW (32 A). If the
user uses an AC charging cable designed for lower charging power/charging current, then the
charging station communicates the maximum charging current to the vehicle. If the current
exceeds 1.3 times the permissible value for more than 1 minute, then the charging station
will stop charging.
The controller monitors the DC output current per charging outlet. If a measured current
value exceeds the preset limits, the charging process is aborted and the outlet contactors are
opened. The vehicle and charging station are electrically separated. No more charging current
flows between the charging station and the vehicle.
You can protect the charging station and the vehicle from short-circuit currents with optional
temperature fuses at the charging outgoing feeders.
SICHARGE D
Operating Instructions, 11/2023, A5E50556539-AG
Description
3.9 Electrical protection devices
49