Direction
Element
4 step over current
element
One element for each
step
Harmonic
Restraint
Mode
Selection
earthFaultDirection
harmRestrBlock
enableDir
enableStep
1-4
DirectionalMode
1-4
Element
enableDir
angleValid
Directional Check
operatingCurrent
SwitchOnToFault
start step 2, 3 and 4
signal to communication scheme
TRSOTF
3V0
3I0
Blocking at parallel
transformers
1
CB
pos
or cmd
Element
3I0
DirModeSel
DirModeSel
INPol
ANSI06000376-2-en.vsdx
I3PDIR
TRIP
ANSI06000376 V2 EN-US
Figure 259: Functional overview of EF4PTOC (51N/67N)
8.4.8 Technical data
IP11455-1 v1
M15223-1 v18
Table 234: EF4PTOC (51N/67N) technical data
Function Range or value Accuracy
Trip current, step 1-4 (1-2500)% of IBase ±1.0% of I
n
at I ≤ I
n
±1.0% of I at I > I
n
Reset ratio > 95% at (10-2500)% of
IBase
-
Relay characteristic angle
(RCA)
(-180 to 180) degrees ±2.0 degrees
Trip current for directional release (1–100)% of IBase For RCA ±60 degrees:
±2.5% of I
n
at I ≤ I
n
±2.5% of I at I > I
n
Independent time delay at 0 to 2 x I
set
,
step 1-4
(0.000-60.000) s ±0.2% or ±35 ms whichever is greater
Minimum operate time for inverse curves,
step 1-4
(0.000 - 60.000) s ±0.2% or ±35 ms whichever is greater
Inverse time characteristics, see Table
1076, Table 1077 and Table 1078
16 curve types See Table 1076, Table 1077 and Table
1078
Second harmonic blocking (5–100)% of fundamental ±2.0% of I
n
Minimum polarizing voltage (1–100)% of VBase ±0.5% of V
n
Minimum polarizing current (2-100)% of IBase ±1.0% of I
n
Table continues on next page
Section 8 1MRK 502 066-UUS B
Current protection
490
Technical manual
To Next Page
Loading...
