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tDef
or after the inverse time delay (setting
TDSN
) the binary output signals TRIP and
TRDIRIN get activated.
The function shall indicate forward/reverse direction to the fault. Reverse direction is
defined as 3I
0
· 3V
0
·cos (φ + 180°)
³
the set value.
This variant has the possibility of choice between definite time delay and inverse time
delay.
The inverse time delay is defined as:
t
TDSN
I
V
reference
I
V
measured
inv
=
⋅
⋅
⋅
⋅
⋅
(
cos (
))
cos (
)
3
3
3
3
0
0
0
0
ϕ
ϕ
EQUATION2032-ANSI V2 EN-US
(Equation 22)
Directional residual current protection measuring 3I
0
and φ
SEMOD171963-48 v4
The function will operate if the residual current is larger than the set value and the
angle |φ = ang(3I
0
)-ang(V
ref
)| is within the sector
RCADir
±
ROADir
V
ref
=-3V
0
Operate area
3I
0
RCA
= 0º
ROA
= 80º
ANSI06000652-2-en.vsd
ANSI06000652 V2 EN-US
Figure 75:
Example of characteristic
For trip, Residual current 3I
0
shall be larger than both
INRelPU
and
INDirPU
, and
residual voltage 3V
0
shall be larger than the
VNRelPU
. In addition, the angle φ shall be
in the set area defined by
ROADir
and
RCADir
. Refer to the simplified logical diagram
in Figure
.
1MRK 511 408-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.2 ANSI
239
Technical manual
Содержание Relion RES670
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