ABB Relion 670 Series Applications Manual page 155

1MRK 511 401-UUS F
8.4.3 Setting guidelines
The parameters for the four step residual overcurrent protection are set via the local HMI or
PCM600. The following settings can be done for the function.
Common base IED values for the primary current (
SBase ) are set in global base values for settings function GBASVAL.
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
SeqTypeUPol : This is used to select the type of voltage polarising quantity i.e. Zero seq or Neg seq
for direction detection.
SeqTypeIPol : This is used to select the type of current polarising quantity i.e. Zero seq or Neg seq
for direction detection.
SeqTypeIDir : This is used to select the type of operating current quantity i.e. Zero seq or Neg seq
for direction detection.
8.4.3.1 Common settings for all steps
AngleRCA : Relay characteristic angle given in degree. This angle is defined as shown in Figure 68.
The angle is defined positive when the residual current lags the reference voltage (Vpol = 3V
ANSI05000135 V3 EN-US
Figure 68: Relay characteristic angle given in degree
Bay control REC670
Application manual
When inverse time overcurrent characteristic is selected, the trip time of the stage
will be the sum of the inverse time delay and the set definite time delay. Thus, if
only the inverse time delay is required, it is important to set the definite time delay
for that stage to zero.
RCA
Operation
IDirPU
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IBase ), primary voltage ( VBase ) and primary
V pol = 3V or V
0 2
en 05000135-4- ansi. vsd
Section 8
Current protection
IP14988-1 v1
M15282-3 v12
M15282-81 v10
or V )
0 2
149