![background image](http://html1.mh-extra.com/html/vamp/vamp-59/vamp-59_installation-operation-and-configuration-instructions_3334048098.webp)
2.14 Inverse time operation
2 Protection functions
Technical description
98
VAMP 24h support phone +358 (0)20 753 3264
VM59.EN001
t
= Operation delay in seconds
k
= User‟s multiplier
I
= Measured value
I
PICKUP
= User‟s pick up setting
A,B,C,D = Constant parameter according
Table 2.14.1-4 Constants for IEEE2 inverse delay equation
Delay type
Parameter
A
B
C
D
E
MI
Moderately inverse
0.1735
0.6791
0.8
-0.08
0.1271
NI
Normally inverse
0.0274
2.2614
0.3
-.1899
9.1272
VI
Very inverse
0.0615
0.7989
0.34
-0.284
4.0505
EI
Extremely inverse
0.0399
0.2294
0.5
3.0094
0.7222
Example for Delay type "Moderately inverse (MI)":
k
= 0.50
I
= 4 pu
I
PICKUP
= 2 pu
A
= 0.1735
B
= 0.6791
C
= 0.8
D
= -0.08
E
= 0.127
38
.
0
8
.
0
2
4
127
.
0
8
.
0
2
4
08
.
0
8
.
0
2
4
6791
.
0
1735
.
0
5
.
0
3
2
t
The operation time in this example will be 0.38 seconds. The
same result can be read from Figure 2.14.1-11.
Содержание VAMP 59
Страница 2: ...2 VM59 EN001...
Страница 211: ...Technical description VM59 EN001 VAMP 24h support phone 358 0 20 753 3264 211...