ABB Relion 650 Series Technical Manual page 159

1MRK 506 326-UUS B
6.2.7 Principle of operation
The sampled analog phase currents are pre-processed in a discrete Fourier filter (DFT) block. From
the fundamental frequency components, as well as sampled values, of each phase current the RMS
value of each phase current is derived. These phase current values are fed to the Instantaneous
phase overcurrent protection SPTPIOC (50) function. In a comparator the RMS values are
compared to the set operation current value of the function Pickup. If a phase current is larger
than the set operation current a signal from the comparator for this phase is set to true. This
signal will, without delay, activate the output signal
signal that is common for all three phases.
The SPTPIOC (50) function can be blocked from the binary input BLOCK.
6.2.8 Technical data
Table 70: SPTPIOC (50) Technical data
Function
Operate current
Reset ratio
Operate time
Reset time
Critical impulse time
Operate time
Reset time
Critical impulse time
Dynamic overreach
6.3 Four step phase overcurrent protection OC4PTOC
(51/67)
6.3.1 Identification
Function description
Four step phase overcurrent
protection
Line distance protection REL650
Technical manual
Range or value
(5-2500)% of lBase
> 95%
20 ms typically at 0 to 2 x I
35 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
45 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
OC4PTOC
© Copyright 2011 ABB Power Grids. All rights reserved
TR_x(x=A, B or C) for this phase and the TRIP
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
51/67
3I>
4
alt
4
TOC-REVA V1 EN-US
Section 6
Current protection
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M14885-1 v3
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