ABB Relion 650 Series Technical Manual page 175

1MRK 506 326-UUS B
6.5.7 Operation principle
The sampled analogue 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 (
operation current a signal from the comparator is set to true. This signal will, without delay,
activate the output signal TRIP.
6.5.8 Technical data
Table 88: EFPIOC (50N) technical data
Function
Operate current
Reset ratio
Operate time
Reset time
Critical impulse time
Operate time
Reset time
Critical impulse time
Dynamic overreach
6.6 Four step residual overcurrent protection EF4PTOC
(51N/67N)
6.6.1 Identification
Function description
Four step residual overcurrent
protection
Line distance protection REL650
Technical manual
Pickup ). If the residual current is larger than the set
Range or value
(1-2500)% of lBase
> 95%
20 ms typically at 0 to 2 x I
30 ms typically at 2 to 0 x I
10 ms typically at 0 to 2 x I
10 ms typically at 0 to 10 x I
40 ms typically at 10 to 0 x I
2 ms typically at 0 to 10 x I
< 5% at t = 100 ms
IEC 61850
identification
EF4PTOC
© Copyright 2011 ABB Power Grids. All rights reserved
Accuracy
± 1.0% of I
± 1.0% of I at I > I
-
-
set
-
set
-
set
-
set
-
set
-
set
-
IEC 60617 ANSI/IEEE C37.2
identification device number
51N/67N
IN
4
alt
4
TEF-REVA V1 EN-US
Section 6
Current protection
M12704-3 v4
M12340-2 v4
at I £ I
n n
n
IP14509-1 v4
M14881-1 v3
169