ABB RES670 Technical Manual page 245

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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
·cos (φ + 180°) ³ the set value.
defined as 3I · 3V
0 0
This variant has the possibility of choice between definite time delay and inverse time
delay.
The inverse time delay is defined as:
⋅ ⋅ ⋅
TDSN ( 3 I 3 V cos (
= 0 0
t
inv
⋅ ⋅
I V measured
3 3 cos (
ϕ
0 0
EQUATION2032-ANSI V2 EN-US
Directional residual current protection measuring 3I
The function will operate if the residual current is larger than the set value and the
angle |φ = ang(3I )-ang(V
0
ANSI06000652 V2 EN-US
Figure 75: Example of characteristic
For trip, Residual current 3I
residual voltage 3V shall be larger than the VNRelPU. In addition, the angle φ shall be
0
in the set area defined by ROADir and RCADir. Refer to the simplified logical diagram
in Figure 76.
reference ))
ϕ
)
)| is within the sector RCADir ± ROADir
ref
RCA = 0º
ROA = 80º
Operate area
3I
0
ANSI06000652-2-en.vsd
shall be larger than both INRelPU and INDirPU, and
0
Section 8
Current protection
and φ
0
V =-3V
ref 0
(Equation 22)
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