ABB Relion 650 Series Technical Manual page 194

Section 6
Current protection
ANSI06000651 V1 EN-US
Figure 99: Explanation of RCAComp
6.7.7.3 Directional residual power protection measuring 3I
φ is defined as the angle between the residual current 3I
with the set characteristic angle
operates when 3I
For trip, both the residual power 3I
3V , shall be larger than the set levels (
0
When the function is activated binary output signals PICKUP and PUDIRIN are activated. If the
activation is active after the set delay
binary output signals TRIP and TRDIRIN are activated.
The function shall indicate forward/reverse direction to the fault. Reverse direction is defined as
3I · 3V ·cos (φ + 180°) ³ the set value.
0 0
This variant has the possibility of choice between definite time delay and inverse time delay.
The inverse time delay is defined as:
188
Instrument
a
transformer
RCAcomp
angle error
3I (to prot)
0
3I (prim)
0
RCADir (φ=ang(3I
· 3V · cos φ gets larger than the set value.
0 0
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Operate area
-3V =V
0 ref
Characteristic after
angle compensation
en06000651_ansi.vsd
and the reference voltage compensated
0
)—ang(V
0
· 3V · cos φ, the residual current 3I
0 0
SN_PU , INRelPU and VNRelPU ).
tDef or after the inverse time delay (setting TDSN ) the
1MRK 506 326-UUS B
RCA = 0°
· 3V · cos φ
0 0
-jRCA
) ). V = -3V e . The function
ref ref 0
and the release voltage
0
Line distance protection REL650
SEMOD171963-32 v4
Technical manual