ABB Relion 670 Series Applications Manual page 166

Section 8
Current protection
Table 22:
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
User Programmable
ASEA RI
RXIDG (logarithmic)
There is also a user programmable inverse time characteristic.
Normally it is required that the negative sequence overcurrent function shall reset as fast as
possible when the current level gets lower than the operation level. In some cases some sort of
delayed reset is required. Therefore different kinds of reset characteristics can be used.
For some protection applications there can be a need to change the current pickup level for some
time. Therefore there is a possibility to give a setting of a multiplication factor
negative sequence current pick-up level. This multiplication factor is activated from a binary input
signal MULTPUx to the function.
8.5.3 Setting guidelines
The parameters for Four step negative sequence overcurrent protection NS4PTOC (46I2) are set
via the local HMI or Protection and Control Manager (PCM600).
The following settings can be done for the four step negative sequence overcurrent protection:
Operation : Sets the protection to Enabled or Disabled .
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.
160
Inverse time characteristics
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IBase ), primary voltage ( VBase ) and primary
1MRK 511 401-UUS F
MultPUx to the
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v3
Bay control REC670
Application manual