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PCS100 AVC-20 User Manual
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14 PROTECTION REQUIREMENTS
14.1 Input Circuit Protection
14.1.1
Power system
The PCS100 is designed for use in TN (low impedance grounded neutral) power systems.
PCS100 may be safely applied to TT (resistance grounded) or IT (insulated neutral) power systems provided that
appropriate additional protections are employed. Refer to ABB document 2UCD200000E039 PCS100 Power
application for further guidance on this subject.
14.1.2
Short circuit protection
The PCS100 AVC-20 connects between the power system supply, and the load.
An upstream circuit breaker is required to protect the AVC-20 against short circuit faults.
The PCS100 AVC-20 is rated to be connected to power systems having fault capacity of the values shown in the
following table. To provide discrimination time for downstream protection, the AVC- 20 can withstand rated fault
capacity for 200ms.
Frame Size
Rated Power [kVA]
400 V models [kA]
Where the power system supply fault capacity exceeds the short circuit withstand rating of the AVC-20,
additional current limitation is required - e.g., a current limiting circuit breaker (e.g., ABB T5 series) or current
limiting fuses in addition to the circuit breaker.
The PCS100 AVC-20 can sustain the fault currents listed above without damage and can be returned immediately
to service following such a fault. Where higher fault currents occur, the system should be inspected for damage -
service may be required.
2B
1000
31.5
Table 14-1: PCS100 AVC-20 short circuit withstand ratings
3B
4B
1500
2000
31.5
40
5B
6B
2500
3000
50
63
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