activated after the set delay. At this moment the block signal to the overcurrent
function will be deactivated.
It the generator is energized at stand still conditions, that is, when the voltage is zero,
the overcurrent function will operate after the short set delay if the generator current
is larger than the set value.
When the generator is started the overvoltage trip signal will be activated the set time
delay after the moment when the voltage has reached the set value. At this moment the
blocking of the overcurrent function is activated.
The delay of the undervoltage function will prevent false operation at short circuits in
the external power grid.
11.1.7.8
Logic diagram
The simplified internal logics, for CVGAPC function are shown in the following
figures.
ADM
A
/D
c
o
nv
er
si
o
n
s
ca
lin
g
w
ith
C
T
r
a
tio
A
/D
c
o
nv
e
rs
io
n
sc
al
in
g
w
ith
C
T
r
a
tio
P
ha
so
r
ca
lc
u
la
tio
n
o
f
in
d
iv
id
ua
l c
ur
re
nt
s
P
ha
so
r
ca
lc
u
la
tio
n
o
f
in
d
iv
id
u
a
l v
ol
ta
g
e
s
CVGAPC function
IED
P
h
as
or
s
&
sa
m
pl
es
P
h
as
or
s
&
sa
m
pl
es
Current and voltage selection
settings
Selection of which current
and voltage shall be given to
the built-in protection
elements
Restraint current selection
Selection of restraint current
Selected current
Selected voltage
Selected restraint current
IEC05000169_2_en.vsd
IEC05000169 V2 EN
Figure 278:
Treatment of measured currents and voltages within IED for CVGAPC function
shows how internal treatment of measured currents is done for
multipurpose protection function
Section 11
1MRK502052-UEN B
Multipurpose protection
586
Technical manual
Summary of Contents for Relion REG670
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