ABB Relion Technical Manual page 236

Section 8
Current protection
8.3.7.4
230
This sub-function 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
⋅ ⋅
3 I 3 V cos ( measured
ϕ
0 0
EQUATION2032-ANSI V2 EN
Directional residual current protection measuring 3I
The function will operate if the residual current is larger that the set value and the angle φ
= ang(3I )-ang(V = -3V
0 ref
ANSI06000652 V2 EN
Figure 104: Example of characteristic
For trip, the residual current 3I
voltage 3V shall be larger than the set level VNRelPU and the angle φ shall be in the set
0
sector ROADir and RCADir.
When the function is activated binary output signals PICKUP and PUDIRIN are activated.
If the output signals are active after the set delay tDef the binary output signals TRIP and
TRDIRIN are activated.
reference ))
ϕ
)
) is within the sector RCADir ± ROADir
0
RCA = 0º
ROA = 80º
Operate area
3I
0
ANSI06000652-2-en.vsd
shall be larger than the set level INDirPU, the release
0
1MRK 502 048-UUS A
and φ
0
V =-3V
ref 0
Technical manual
(Equation 55)