ABB Relion 670 Series Applications Manual page 163
Bay control
Hide thumbs
Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
Table of Contents
Advertisement
1MRK 511 401-UEN Rev. K
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 operating level for
some time. Therefore there is a possibility to give a setting of a multiplication factor
the negative sequence current pick-up level. This multiplication factor is activated from a
binary input signal ENMULTx to the function.
8.5.4
Setting guidelines
The parameters for Four step negative sequence overcurrent protection NS4PTOC 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 On or Off .
Common base IED values for the primary current (
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , UBase
SBase . Note that this function will only use IBase value.
and
8.5.4.1
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.
Bay control REC670
Application manual
SBase ) are set in global base values for settings function GBASVAL.
When inverse time overcurrent characteristic is selected, the operate 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.
© Copyright 2017 Hitachi Power Grids. All rights reserved
GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v3
IBase ), primary voltage ( UBase ) and primary
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
Section 8
Current protection
IxMult to
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
157
Advertisement
Table of Contents
