ADM
A
/D
c
on
ve
rs
io
n
s
ca
lin
g
w
ith
C
T
ra
tio
A
/D
c
on
ve
rs
io
n
s
ca
lin
g
w
ith
C
T
ra
tio
P
ha
so
r
ca
lc
ul
at
io
n
o
f i
nd
iv
id
u
al
ph
as
e
c
ur
re
nt
P
ha
so
r
ca
lc
ul
at
io
n
o
f i
nd
iv
id
u
al
ph
as
e
c
ur
re
nt
Differential function
D
er
iv
e
e
qu
at
io
n
to
c
al
cu
la
te
d
iff
er
e
nt
ia
l c
ur
re
nt
s
Trafo
Data
P
ha
so
rs
&
s
a
m
pl
es
P
ha
so
rs
&
s
a
m
pl
es
Instantaneous (sample based)
Differential current, phase L1
Instantaneous (sample based)
Differential current, phase L2
Instantaneous (sample based)
Differential current, phase L3
Fundamental frequency (phasor
based) Diff current, phase L1 &
phase current contributions from
individual windings
Fundamental frequency (phasor
based) Diff current, phase L2 &
phase current contributions from
individual windings
Fundamental frequency (phasor
based) Diff current, phase L3 &
phase current contributions from
individual windings
Negative sequence diff current
& NS current contribution from
individual windings
en06000554-3-en.vsd
MAX
Settings for Zer. Seq.
Current Reduction
IDL1MAG
IDL2MAG
IDL3MAG
IDNSMAG
IDL2
IDL1
IDL3
IBIAS
O
pe
n
C
T
lo
gi
c
o
n
W
1
s
id
e
O
pe
n
C
T
lo
gi
c
o
n
W
2
s
id
e
IEC06000544 V3 EN
Figure 38:
Treatment of measured currents within IED for transformer differential function
shows how internal treatment of measured currents is done in case of a two-
winding transformer.
The following currents are inputs used in the power transformer differential protection
function. They must all be expressed in power system (primary) A.
Section 6
1MRK502052-UEN B
Differential protection
136
Technical manual
Summary of Contents for Relion REG670
Page 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Page 2: ......
Page 44: ...38 ...
Page 58: ...52 ...
Page 80: ...74 ...
Page 106: ...100 ...
Page 482: ...476 ...
Page 548: ...542 ...
Page 570: ...564 ...
Page 600: ...594 ...
Page 608: ...602 ...
Page 630: ...624 ...
Page 862: ...856 ...
Page 1094: ...1088 ...
Page 1226: ...1220 ...
Page 1250: ...1244 ...
Page 1297: ...1291 ...