Table 266: STBPTOC (50STB) Group settings (advanced)
Name Values (Range) Unit Step Default Description
tDelay 0.000 - 60.000 s 0.001 0.000 Time delay
Table 267: STBPTOC (50STB) 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
8.9.6 Monitored data
PID-3462-MONITOREDDATA v5
Table 268: STBPTOC (50STB) Monitored data
Name Type Values (Range) Unit Description
IA REAL - A Current in phase A
IB REAL - A Current in phase B
IC REAL - A Current in phase C
8.9.7 Operation principle
M12905-3 v5
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
IPickup
.
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
delay
t
, the TRIP output signal is activated. The function can be blocked by activation of the BLOCK
input.
1MRK 502 066-UUS B Section 8
Current protection
535
Technical manual
To Next Page
Loading...
