ABB RET670 Applications Manual page 433

1MRK504116-UUS C
Application manual
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.
Common settings for all steps
tx: Definite time delay for step x. Used if definite time characteristic is chosen.
AngleRCA: Relay characteristic angle given in degree. This angle is defined as shown
in figure 192. The angle is defined positive when the residual current lags the reference
voltage (Vpol = 3V or V
0
RCA
IDirPU
ANSI05000135 V3 EN
Figure 192: 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
• Voltage (3V or V )
0 2
• Current (3I · ZNpol or 3I
0
• both currents and voltage, Dual (dual polarizing, (3V
ZNpol)).
Normally voltage polarizing from the internally calculated residual sum or an external
open delta is used.
)
2
V pol = 3V
Operation
en 05000135-4- ansi. vsd
·ZNpol where ZNpol is RNpol + jXNpol), or
2
Section 3
IED application
or V
0 2
+ 3I · ZNpol) or (V
0 0
+ I ·
2 2
427