Rockwell Automation 865 Differential Protection Relay - Manual (Page 45)

Chapter
3
865-UM001A-EN-P – July 2009
Protection Functions
Each protection stage can independently be enabled or disabled
according to the requirements of the intended application.
The device limits the maximum number of enabled stages to about
30, depending on the type of the stages. For more information,
please see the configuration instructions in Chapter 2 in the first part
of this manual.
Table 3.1 – List of Protection Functions
IEEE/
ANSI code
IEC Symbol Function Name
50/51 3I>, 3I>>, 3I’>, 3I’>> Overcurrent protection
87 ∆I>, ∆I>> Differential overcurrent protection
46 I 2 >, I’ 2 > Current unbalance protection
49 T> Thermal overload protection
50N/51N
I 0 >,
I 0 >>,
I 0 >>>,
I 0 >>>>
Earth fault protection
50BF CBFP Circuit-breaker failure protection
99 Prg1...8 Programmable stages
50ARC
50NARC
ArcI>, ArcI’>
ArcI
01 >, ArcI 02 >
Optional arc fault protection
Setting Groups
Most stages have two setting groups. Changing between setting
groups can be controlled manually or using any of the digital inputs,
virtual inputs, virtual outputs or LED indicator signals. By using
virtual I/O the active setting group can be controlled using the local
panel mimic display, any communication protocol or using the
inbuilt programmable logic functions.
Maximum Number of
Protection Stages
in one application
General Features of
Protection Stages
Protection Functions