ABB Relion 670 series - Page 475

8.3.5 Settings
IP11449-1 v2
PID-3574-SETTINGS v3
Table 222: EFPIOC (50N) Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Operation Disabled/Enabled
Pickup 5 - 2500 %IB 1 200 Operate residual current level in % of IBase
Table 223: EFPIOC (50N) Group settings (advanced)
Name Values (Range) Unit Step Default Description
MultPU 0.5 - 5.0 - 0.1 1.0 Multiplier for operate current level
Table 224: EFPIOC (50N) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
8.3.6 Monitored data
PID-3574-MONITOREDDATA v2
Table 225: EFPIOC (50N) Monitored data
Name Type Values (Range) Unit Description
IN REAL - A Residual current
8.3.7 Operation principle
M12704-3 v7
The sampled analog residual currents are pre-processed in a discrete Fourier filter (DFT) block.
From the fundamental frequency components of the residual current, as well as from the sample
values the equivalent RMS value is derived. This current value is fed to the Instantaneous residual
overcurrent protection (EFPIOC,50N). In a comparator the RMS value is compared to the set
operation current value of the function (
Pickup ). If the residual current is larger than the set
operation current a signal from the comparator is set to true. This signal will, without delay,
activate the output signal TRIP.
There is also a possibility to activate a preset change of the set operation current via a binary
input (enable multiplier MULTPU). In some applications the operation value needs to be changed,
for example due to transformer inrush currents.
EFPIOC (50N) function can be blocked from the binary input BLOCK. The trip signals from the
function can be blocked from the binary input BLKAR, that can be activated during single pole trip
and autoreclosing sequences.
1MRK 502 066-UUS B Section 8
Current protection
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