Setting Guidelines; Settings For Each Step - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
8.5.3

Setting guidelines

The parameters for Four step negative sequence overcurrent protection NS4PTOC 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 On or Off .
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ),
UBase ) and ( SBase ).
(
8.5.3.1

Settings for each step

DirModeSelx : The directional mode of step x. Possible settings are off/nondirectional/
forward/reverse.
Characteristx : Selection of time characteristic for step x . Definite time delay and different
types of inverse time characteristics are available.
Table 38: Inverse time characteristics
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)
Application manual
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.
x means step 1, 2, 3 and 4.
Section 8
Current protection
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v3
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
417