Micom P631 - Amplitude Matching

Q6Z0102A
Parameter
set 1
set 2
set 3
set 4
DIFF:
Enable PSx
072 152
073 152
074 152
075 152
DIFF:
Enabled
[ 041 210 ]
DIFF:
Enable PSx
[ * ]
1
0
0: No
1: Yes
0
0: No
1: Yes
DIFF:
General enable USER
[ 019 080 ]
1
Fig. 3-77: Enabling or disabling differential protection
3.21.2 Amplitude Matching
In order to set the amplitude matching for the protected object, a reference
power - identical for all windings - needs to be defined. For two-winding
arrangements, the nominal power will usually be the reference power. The
individual reference currents for each winding of the protected object are then
calculated by the P631 on the basis of the set reference power and the set
primary nominal voltages of the transformer.
I
ref ,a
=
S
ref
3 ⋅ V
nom,a
I
ref ,b
=
S
ref
3 ⋅ V
nom,b
S
ref
: reference power
I
ref ,a
, I
ref ,b
: reference current of winding a or b, respectively
V
nom,a
, V
nom,b
: nominal voltage of winding a or b, respectively
The P631 calculates the matching factors on the basis of the reference currents
and the set primary nominal currents of the system transformers.
k
am,a
=
I
nom,a
I
ref ,a
k
am,b
=
I
nom,b
I
ref ,b
with
k
am,a
,
k
am,b
: amplitude matching factor of end a or b, respectively
I
nom,a
,
I
nom,b
: primary nominal currents of the system transformers
Reference currents and matching factors are displayed at the P631.
P631
3 Operation
3-110 P631/EN M/R-11-C // P631-310-650