ABB ret650, Technical Manual

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8.3.2 Functionality
The Instantaneous residual overcurrent protection EFPIOC has a low transient
overreach and short tripping times to allow use for instantaneous earth-fault
protection, with the reach limited to less than typical eighty percent of the transformer
impedance at minimum source impedance. EFPIOC can be configured to measure the
residual current from the three-phase current inputs or the current from a separate
current input. EFPIOC can be blocked by activating the input BLOCK.
8.3.3 Function block
EFPIOC
I3P*
BLOCK TRIP
IEC08000003 V1 EN
Figure 68: EFPIOC function block
8.3.4 Signals
Table 79: EFPIOC Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
BLOCK BOOLEAN 0 Block of function
Table 80: EFPIOC Output signals
Name Type Description
TRIP BOOLEAN Trip signal
8.3.5 Settings
Table 81: EFPIOC Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation Off / On
IN>> 1 - 2500 %IB 1 200 Operate residual current level in % of
IBase
Table 82: EFPIOC Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
1MRK 504 135-UEN A
Section 8
Current protection
153
Technical manual