6.4.6 Monitored data
Table 47: EF4PTOC Monitored data
Name
Type Values (Range) Unit Description
STDIR INTEGER 3=Both
1=Forward
2=Reverse
0=No direction
-
Fault direction coded as
integer
IOp REAL - A Operating current level
UPol REAL - kV Polarizing voltage level
IPol REAL - A Polarizing current level
UPOLIANG REAL - deg Angle between polarizing
voltage and operating current
IPOLIANG REAL - deg Angle between polarizing
current and operating current
IOPDIR REAL - A Amplitude of the directional
operating quantity
6.4.7 Operation principle
Four step residual overcurrent protection, zero or negative sequence direction EF4PTOC
(51N/67N) function has the following four “Analog Inputs” on its function block in the
configuration tool:
1. I3P, input used for “Operating Quantity”.
2. V3P, input used for “Voltage Polarizing Quantity”.
3. I3PPOL, input used for “Current Polarizing Quantity”.
4. I3PDIR, input used for “Operating Directional Quantity”.
These inputs are connected from the corresponding pre-processing function blocks in the
Configuration Tool within PCM600.
6.4.7.1 Operating quantity within the function
If the function is set to measure zero sequence, it uses Residual Current (3I
0
) for its
operating quantity. The residual current can be:
1. directly measured (when a dedicated CT input of the IED is connected in PCM600 to
the fourth analog input of the pre-processing block connected to EF4PTOC (51N/
67N) function input I3P). This dedicated IED CT input can be for example, connected
to:
1MRK 511 287-UUS A Section 6
Current protection
103
Technical manual
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