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
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
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v2
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.
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
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
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
x means step 1, 2, 3 and 4.
1MRK 502 071-UUS A
Section 9
Current protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
379
Application manual
Summary of Contents for RELION 670 SERIES REG670
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