Directio n
Elemen t
4 step over current
elemen t
One ele me nt fo r ea ch
step
Harmonic
Restrain t
Mode
Sele ction
earthFaultDir ection
harmRestrB lock
ena bleDir
ena bleStep1-4
Directio nalMode1-4
TRIP
Elemen t
ena bleDir
ang leValid
Directio nal Che ck
ope ratin gCurrent
SwitchO nTo Fa ult
star t step 2, 3 and 4
signal to
commu nica tion
sche me
TRIP
3U0
3I0
Blocking at par allel
transfor mer s
1
CB
pos
or cmd
Elemen t
3I0
DirMode
DirMode
INP ol
IEC06000376-2-en.vsd
I3PDIR
IEC06000376 V3 EN
Figure 169:
Functional overview of EF4PTOC
8.4.8
Technical data
Table 178:
EF4PTOC technical data
Function
Range or value
Accuracy
Operate current
(1-2500)% of
lBase
± 1.0% of I
r
at I < I
r
± 1.0% of I at I > I
r
Reset ratio
> 95% at (1-2500)% of
lBase -
Operate current for directional
comparison
(1–100)% of
lBase
For RCA ± 60 degrees:
± 2.5% of I
r
at I ≤ I
r
± 2.5% of I < I
r
Independent time delay for step
1, 2, 3, and 4
(0.000-60.000) s
± 0.2% or ± 35 ms whichever is
greater at 0 to 2 x I
set
Inverse characteristics, see table
18 curve types
See table
, table
Second harmonic restrain
operation
(5–100)% of fundamental
± 2.0% of I
r
Relay characteristic angle
(-180 to 180) degrees
± 2.0 degrees
Minimum polarizing voltage
(1–100)% of
UBase
± 0.5% of U
r
Minimum polarizing current
(2-100)% of
IBase
± 1.0% of I
r
Table continues on next page
1MRK502052-UEN B
Section 8
Current protection
373
Technical manual
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