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1.1 Relay features
1 General
Operation and configuration
4
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VM259EN007
1.
General
This first part (Operation and configuration) of the publication
contains general descriptions of the functions as well as
operation instructions. It also includes instructions for
parameterization and configuration of the relay and
instructions for changing settings.
The second part (Technical description) of the publication
includes detailed protection function descriptions as well as
application examples and technical data sheets.
The Mounting and Commissioning Instructions are published
in a separate publication with the code VMMC.EN0xx.
1.1.
Relay features
The comprehensive protection functions of the relay make it
ideal for utility, industrial, marine and off-shore power
distribution applications. The relay features the following
protection functions.
List of protection functions
IEEE/
ANSI code
IEC symbol Function name
Main protection functions
21
Z<
Short circuit distance protection
21N
Ze<
Earth-Fault distance protection
87
dI>
Line differential protection
85
Pilot signalling
Back-up protection functions
67
I
dir
>, I
dir
>>,
I
dir
>>>, I
dir
>>>>
Directional overcurrent protection
67N
Directional earth fault protection
50/51
3I>, 3I>>, 3I>>> Non directional overcurrent protection
50N/51N
I
0
>, I
0
>>, I
0
>>>,
I
0
>>>>
Non directional earth fault protection
Supporting functions
79
0
1
Autoreclosing
25
∆f, ∆U, ∆φ
Synchrocheck
50ARC/
50NARC
ArcI>, ArcIO>
Optional arc fault protection
50BF
CBFP
Circuit-breaker failure protection
81R
df/dt
Rate of change of frequency (ROCOF) protection
46R
I
2
/I
1
>
Broken line protection
37
I<
Undercurrent protection
59N
U
0
>, U
0
>>
Zero sequence voltage protection
49
T>
Thermal overload protection
59
U>, U>>, U>>> Overvoltage protection
27
U<, U<<, U<<< Undervoltage protection
32
P<, P<<
Reverse and underpower protection