7.2.6
Monitored data
Table 38:
EF4PTOC (51N_67N) Monitored data
Name
Type
Values (Range)
Unit
Description
STDIR
INTEGER
0=No direction
1=Forward
2=Reverse
3=Both
-
Fault direction coded as
integer
IOp
REAL
-
A
Operating current level
VPol
REAL
-
kV
Polarizing voltage level
IPol
REAL
-
A
Polarizing current level
VPolIang
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
7.2.7
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.
7.2.7.1
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:
Section 7
1MRK 505 277-UUS C
Current protection
88
Technical Manual
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