MultPUx to the negative sequence current pick-up level. This multiplication factor is
activated from a binary input signal MULTPUx to the function.
9.5.3 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 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.
9.5.3.1 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 37: 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
Table continues on next page
Section 9 1MRK 506 369-UUS -
Current protection
524 Line distance protection REL670 2.2 ANSI
Application manual
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