where:
Un>
Set value for step 1 and step 2
U
Measured voltage
The type B curve is described as:
2.0
480
0.035
32
0.5
n
n
k
t
U
U
U
IECEQUATION2423 V2 EN
(Equation 113)
The type C curve is described as:
3.0
480
0.035
32
0.5
n
n
k
t
U U
U
×
=
+
æ
ö
-
>
×
-
ç
÷
>
è
ø
IECEQUATION2425 V1 EN
(Equation 114)
The customer programmable curve is defined by the below equation, where A, B, C,
D, k and p are settings:
p
n
n
k A
t
D
U U
B
C
U
×
=
+
æ
ö
-
>
×
-
ç
÷
>
è
ø
EQUATION1439 V2 EN
(Equation 115)
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
CrvSatn
is set
to compensate for this phenomenon. In the voltage interval Un> up to Un> · (1.0 +
CrvSatn
/100) the used voltage will be: Un> · (1.0 +
CrvSatn
/100). If the
programmable curve is used this parameter must be calculated so that:
0
100
CrvSatn
B
C
×
- >
EQUATION1435 V1 EN
(Equation 116)
The highest phase (or phase-to-phase) voltage is always used for the inverse time
delay integration, see figure
. The details of the different inverse time
characteristics are shown in section
1MRK502052-UEN B
Section 9
Voltage protection
497
Technical manual
Summary of Contents for Relion REG670
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