tResetx
: Constant reset time delay in s for step x.
HarmBlockx
: This is used to enable block of step x from 2
nd
harmonic restrain function.
tPCrvx, tACrvx, tBCrvx, tCCrvx
: Parameters for user programmable of inverse time
characteristic curve. The time characteristic equation is according to equation 38:
[ ] = + ×
-
>
æ ö
ç ÷
ç ÷
ç ÷
æ ö
ç ÷
ç ÷
è ø
è ø
p
A
t s B k
i
C
in
EQUATION1189 V1 EN-US (Equation 38)
Further description can be found in the technical reference manual.
tPRCrvx, tTRCrvx, tCRCrvx
: Parameters for user programmable of inverse reset time
characteristic curve. Further description can be found in the technical reference manual.
7.4.3.2 Common settings for all steps
M15282-81 v9
AngleRCA
: Relay characteristic angle given in degree. This angle is defined as shown in
figure 52. The angle is defined positive when the residual current lags the reference voltage
(Upol = 3U
0
or U
2
)
Upol = 3U
0
or U
2
I>Dir
RCA
Operation
en 05000135-4-nsi.vsd
IEC05000135 V4 EN-US
Figure 52: Relay characteristic angle given in degree
In a normal transmission network a normal value of RCA is about 65°. The setting range is -180°
to +180°.
polMethod
: Defines if the directional polarization is from
1MRK 511 358-UEN A Section 7
Current protection
121
Application manual
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