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Implementing protections for the energy storage
General principles
￭
The requirements for the customer-defined protections at the energy storage end:
•
disconnecting device between the drive and energy storage system (for example,
isolation disconnector switch, withdrawable circuit breaker)
•
overload and short circuit protection for the cabling (for example, circuit breaker
with thermal or electromagnetic trip unit)
•
overload and short circuit protection for the energy storage elements itself (for
example, integrated overload protection in batteries).
Selecting a protective device for the energy storage
￭
The customer (or the system integrator) must equip the energy storage with a
protective device. The protective device does not belong to the drive delivery.
The protective device must provide an overload and short-circuit protection for the
energy storage. If there is no other protection device for the cables at the energy
storage end, the protective device of the energy storage must also provide the overload
and short-circuit protection for the cable(s).
The customer (or the system integrator) must verify the operation of the protective
device by short circuit calculations taking into account the impedances of the drive,
filter (if any), 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 (isolating) device
￭
The customer (or the system integrator) must equip the energy storage with an
disconnecting (isolating) device. The disconnecting device is not included in the drive
delivery.
Protecting the energy storage cable
￭
ABB equips the DC feeder unit with fuses as standard. Make sure that the fuses protect
also the 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, ABB
recommends to install a discharging device.
Guidelines for planning electrical installation 23
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