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Implementing protections for the energy storage
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General principles
The requirements for the customer-defined protections at the energy storage end:
•
disconnecting device between drive and energy storage system (for example, isolation
disconnector switch, withdrawable circuit breaker)
•
proper overload and short circuit protection for the cabling (for example, circuit breaker
with thermal or electromagnetic trip unit)
•
proper overload and short circuit protection for the energy storage elements itself (for
example, integrated overload protection in batteries).
￭
Selecting the protective circuit breaker of the energy storage
WARNING!
ABB is not responsible for the energy storage selection or protection of the energy
storage.
The customer (or the system integrator) must equip the energy storage with a protective
circuit breaker. The breaker must be able to switch the load current on and off. The breaker
must also provide the overload and short-circuit protection for the energy storage. If there
is no other protection devices for the cables at the energy storage end, the breaker must
also provide the overload and short-circuit protection for the cable(s).
The energy storage protective circuit breaker does not belong to the converter unit delivery.
The customer (or the system integrator) must verify the operation of the circuit breaker by
short circuit calculations taking into account impedances of the converter, filter, cabling and
energy storage, and minimum and maximum state of charge of the energy storage. The
customer (or the system integrator) must take into account the impact of ageing to storage
impedances.
￭
Energy storage disconnecting device
The customer (or the system integrator) must equip the energy storage also with an energy
storage disconnecting device. The disconnecting device does not belong to the converter
unit delivery.
￭
Overload protection of the system by the DC/DC converter
There is a thermal protection function in the DC/DC converter control program. For more
information on the thermal protection function, see the firmware manual.
￭
Protecting the energy storage cable
ABB equips the DC/DC converter unit with fuses as standard. The fuses protect the DC/DC
converter and cables in a cable short-circuit situation.
The customer (or the system integrator) must equip the energy storage with overload and
short circuit protection for the cable.
￭
Energy storage discharging device
When necessary, the customer (or the system integrator) must equip the energy storage
with a discharging device. If the energy storage is a super capacitor, we recommend to
have it.
Guidelines for planning electrical installation 55
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