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 (IBase), primary voltage (UBase)
and primary power (SBase) are set in global base values for settings function
GBASVAL.
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
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
M15282-81 v10
AngleRCA: Relay characteristic angle given in degree. This angle is defined as
shown in Figure
81. The angle is defined positive when the residual current lags
the reference voltage (Upol = 3U
0
or U
2
)
Upol = -3U
0
or
IN>Dir
RCA
Operation
-3U
2
IEC05000135-5-en.vsdx
IEC05000135 V5 EN-US
Figure 81: 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°.
1MRK 505 393-UEN B Section 8
Current protection
Line differential protection RED650 2.2 IEC 169
Application manual
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