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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 is not included in 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 aging 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.
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
￭
There must be protective devices on the two ends of the energy storage cable:
•
output DC fuses in the DC/DC converter unit (available from ABB, must be acquired
and installed by the customer or system integrator)
•
energy storage protective device (must be acquired and installed by the customer
or system integrator).
On the converter side of the cable, the output DC fuses protect the DC/DC converter
and the cable in a short-circuit situation.
On the energy storage side of the cable, the energy storage protective device protects
the energy storage and the cable in a short-circuit or overload situation.
Guidelines for planning electrical installation 91
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