Curve name
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 MultPUx to the negative sequence current pick-up level. This multiplication
factor is activated from a binary input signal MULTPUx to the function.
3.7.5.2 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.
IBase: Base current in primary A. This current is used as reference for current setting.
It can be suitable to set this parameter to the rated primary current of the protected
object where the current measurement is made.
Section 3 1MRK504116-UUS C
IED application
442
Application manual
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