Monitored Data - ABB REL650 series Technical Manual

1MRK 506 335-UUS A
7.2.6
7.2.7
7.2.8
Technical manual

Monitored Data

Table 81: SPTPIOC (50) Monitored data
Name Type
IA REAL
IB REAL
IC REAL
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 phase segregated output
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 TR_x(x=A, B or C) for this phase and the TRIP
signal that is common for all three phases.
The SPTPIOC (50) function can be blocked from the binary input BLOCK.
Technical data
Table 82: 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
Values (Range) Unit
- A
- A
- A
Range or value
(5-2500)% of lBase
> 95%
20 ms typically at 0 to 2 x I
set
30 ms typically at 2 to 0 x I
set
10 ms typically at 0 to 2 x I
set
10 ms typically at 0 to 5 x I
set
40 ms typically at 5 to 0 x I
set
2 ms typically at 0 to 5 x I
set
< 5% at t = 100 ms
Section 7
Current protection
Description
Current in phase A
Current in phase B
Current in phase C
Accuracy
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
-
-
-
-
-
-
-
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