ABB RELION 670 Series Technical Manual page 541

1MRK 502 066-UUS B
Table 266: STBPTOC (50STB) Group settings (advanced)
Name Values (Range)
tDelay 0.000 - 60.000
Table 267: STBPTOC (50STB) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 12
8.9.6 Monitored data
Table 268: STBPTOC (50STB) Monitored data
Name
IA
IB
IC
8.9.7 Operation principle
The sampled analog phase currents are pre-processed in a discrete Fourier filter (DFT) block. From
the fundamental frequency components of each phase current the RMS value of each phase
current is derived. These phase current values are fed to a comparator in the stub protection
function STBPTOC (50STB). In a comparator the RMS values are compared to the set operating
current value of the function
If a phase current is larger than the set operating current the signal from the comparator for this
phase is activated. This signal will, in combination with the release signal from line disconnection
(RELEASE input), activate the timer for the TRIP signal. If the fault current remains during the timer
t , the TRIP output signal is activated. The function can be blocked by activation of the BLOCK
delay
input.
Technical manual
Unit Step
s 0.001
Unit Step
- 1
Type Values (Range)
REAL -
REAL -
REAL -
IPickup .
Default Description
0.000 Time delay
Default Description
1 Selection of one of the Global Base Value
groups
Unit Description
A Current in phase A
A Current in phase B
A Current in phase C
Section 8
Current protection
PID-3462-MONITOREDDATA v5
M12905-3 v5
535