Table 25: PHPIOC (50) Output signals
Name Type Description
TRIP BOOLEAN Common trip signal
6.1.5 Settings
Table 26: PHPIOC (50) Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
Pickup 5 - 2500 %IB 1 200 Phase current pickup in % of IBase
Table 27: PHPIOC (50) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
6.1.6 Monitored data
Table 28: PHPIOC (50) Monitored data
Name
Type Values (Range) Unit Description
I_A REAL - A Current in phase A
I_B REAL - A Current in phase B
I_C REAL - A Current in phase C
6.1.7 Operation principle
The sampled analog phase currents are pre-processed in a discrete Fourier filter (DFT)
block. The RMS value of each phase current is derived from the fundamental frequency
components, as well as sampled values of each phase current. These phase current values
are fed to the instantaneous phase overcurrent protection 3-phase output function
PHPIOC (50). 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 TRIP signal that is common for all three phases.
PHPIOC (50) can be blocked from the binary input BLOCK.
Section 6 1MRK 511 287-UUS A
Current protection
84
Technical manual
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