ABB RELION 670 Series Technical Manual page 624

Section 9
Voltage protection
t
=
V Vpickup
32
⋅
Vpickup
ANSIEQUATION2287 V3 EN-US
The type C curve is described as:
t
=
V Vpickup
32
⋅
Vpickup
ANSIEQUATION2288 V2 EN-US
The customer programmable curve is defined by the below equation, where A, B, C, D, k and p are
settings:
=
t
æ
×
ç B
è
EQUATION1616 V1 EN-US
When the denominator in the expression is equal to zero the time delay will be infinity. There will
be an undesired discontinuity. Therefore, a tuning parameter
phenomenon. In the voltage interval Vpickup up to Vpickup · (1.0 +
will be: Vpickup · (1.0 +
calculated so that:
CrvSatn
×
B
100
EQUATION1435 V1 EN-US
The highest phase (or phase-to-phase) voltage is always used for the inverse time delay
integration, see figure 332. The details of the different inverse time characteristics are shown in
section "Inverse
618
TD 480
⋅
0 035 .
+
− >
0 5 .
−
>
480
TD
⋅
0 035 .
+
− >
0 5 .
−
>
×
TD A
+
D
P
ö
-
V Vpickup
-
C ÷
ø
Vpickup
CrvSatn /100). If the programmable curve is used this parameter must be
- >
C 0
characteristics".
1MRK 502 066-UUS B
CrvSatn is set to compensate for this
CrvSatn /100) the used voltage
Technical manual
(Equation 177)
(Equation 178)
(Equation 179)
(Equation 180)