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Section 7
Current protection
7.3.1
Identification
Function description
Directional residual overcurrent
protection, four steps
7.3.2
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 (
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , UBase
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.
7.3.2.1
Common settings for all steps
AngleRCA : Relay characteristic angle given in degree. This angle is defined as shown in
Figure 94. The angle is defined positive when the residual current lags the reference voltage
(Upol = 3U
160
When inverse time overcurrent characteristic is selected, the operate 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.
SBase ) are set in global base values for settings function GBASVAL.
or U
)
0
2
IEC 61850
IEC 60617
identification
identification
EF4PTOC
4(IN>)
4
alt
4
TEF-REVA V2 EN-US
IBase ), primary voltage ( UBase ) and primary
1MRK 505 370-UEN D
ANSI/IEEE C37.2
device number
51N_67N
M15282-81 v10
Busbar protection REB670
Application manual
M14881-1 v6
IP14988-1 v1
M15282-3 v12
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