ABB Relion 670 Series RES670, Technical Manual

Page: 242 / 888

-3V
0
=V
ref
Trip area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)

Characteristic after
angle compensation
RCAcomp
ANSI06000651-2-en.vsd
RCADir = 0º
ANSI06000651 V2 EN
Figure 71: Explanation of RCAComp
Directional residual power protection measuring 3I
0
· 3V
0
· cos φ
φ is defined as the angle between the residual current 3I
0
and the reference voltage (V
ref
=
-3V
0
e
-jRCA
) compensated with the set characteristic angle RCADir (|φ=ang(3I
0
)—
ang(V
ref
)|). The function operates when 3I
0
· 3V
0
· cos φ gets larger than the set value
SN> . Refer to the simplified logical diagram in Figure 73 .
For trip, the residual power 3I
0
· 3V
0
· cos φ, the residual current 3I
0
and the release
voltage 3V
0
, shall be larger than the set levels ( SN_PU , INRelPU and VNRelPU ).
Trip from this function can be blocked from the binary input BLKTRDIR.
When the function picks up, binary output signals PICKUP and PUDIRIN are activated.
If the output signals PICKUP and PUDIRIN remain active for the set delay
tDef or after
Section 8
1MRK 511 365-UUS A
Current protection
236 Phasor measurement unit RES670 2.1 ANSI
Technical manual