EF4PTOC (51N/67N) Logic Diagram Simplified logic diagram for the complete
EF4PTOC (51N/67N) function is shown in figure
:
en 06000376_ansi. vsd
Direction
Element
4 step over current
element
One element for each
step
Harmonic
Restraint
Mode
Selection
ground FaultDirection
harmRestrBlock
enableDir
enableStep1-4
DirectionalMode1-4
TRIP
Element
enableDir
angleValid
Directional Check
operatingCurrent
SwitchOnToFault
pickup step 2 , 3 and 4
signal to
communication
scheme
TRIP
3V0
3I0
Blocking at parallel
transformers
or
CB
pos
or cmd
Element
3I0
DirModeSel
DirModeSel
INPol
ANSI06000376 V1 EN
Figure 61:
Functional overview of EF4PTOC (51N/67N)
8.2.8
Technical data
Table 106:
EF4PTOC (51N/67N) technical data
Function
Range or value
Accuracy
Trip current, step 1 - 4
(1-2500)% of
lBase
±1.0% of I
n
at I ≤ I
n
±1.0% of I at I > I
n
Reset ratio
> 95% at (10-2500)% of
lBase
-
Relay characteristic angle
(RCA)
(-180 to 180) degrees
±2.0 degrees
Trip current for directional release (1–100)% of
lBase
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
Table continues on next page
1MRK 511 365-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.1 ANSI
211
Technical manual
Содержание Relion 670 Series RES670
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