1.1 Relay features
1 General
Operation and configuration
4
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VM59.EN001
1.
General
This first part (Operation and configuration) of the publication
contains general descriptions of the functions, of the protection
relay 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
87L
LdI>,
LdI>>
Line differential protection
87L
f2
Second harmonic blocking
87L
f5
Fifth harmonic blocking
50/51
3I>, 3I>>,
3I>>>
Overcurrent protection
50N/51N
I
0
>, I
0
>>,
I
0
>>>,
I
0
>>>>
Earth fault protection
49
T>
Thermal overload protection
50BF
CBFP
Circuit-breaker failure protection
46
I
2
>
Current unbalance protection
59N
U
0
>, U
0
>>
Zero sequence voltage protection
67N,
50N/51N
Directional or non directional.
earth-fault, low-set stage,
sensitive, definite or inverse time
79
AR
Auto-reclosing
99
Prg1…8
Programmable stages
51F2
I
f2
>
Second harmonic O/C stage
51F5
I
f5
>
Fifth harmonic O/C stage
