Setting Guidelines - ABB REC670 Applications Manual

Section 8
Current protection
8.5.3
8.5.3.1
186

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 primary current (IBase), primary voltage (VBase) and
primary power (SBase) are set in Global base values for settings function GBASVAL.
GlobalBaseSel: It is used to select a GBASVAL function for reference of base values.
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.
Settings for each step
x means step 1, 2, 3 and 4.
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 23: 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
Table continues on next page
1MRK 511 401-UUS A
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v2
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
Bay control REC670 2.2 ANSI
Application manual