Setting Guidelines - ABB RELION 670 Series Applications Manual

Section 8
Current protection
Curve name
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.
8.3.3

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 .
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
8.3.3.1 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.
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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.
x means step 1, 2, 3 and 4.
1MRK 511 364-UUS A
MultPUx to the
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v3
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
Application manual