•
inverse curve A
•
inverse curve B
•
inverse curve C
•
customer programmable inverse curve
The type A curve is described as:
n
n
k
t
U U
U
=
æ
ö
-
>
ç
÷
>
è
ø
IECEQUATION2422 V1 EN
(Equation 117)
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 118)
The type C curve is described as:
3.0
480
0.035
32
0.5
n
k
t
U U
U
×
=
+
-
>
æ
ö
×
-
ç
÷
>
è
ø
IECEQUATION2421 V1 EN
(Equation 119)
The customer programmable curve can be created as:
p
n
n
k A
t
D
U U
B
C
U
×
=
+
æ
ö
-
>
×
-
ç
÷
>
è
ø
EQUATION1439 V2 EN
(Equation 120)
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
U
n
>
up to
U
n
>
· (1.0 +
CrvSatn
/100) the used voltage will be:
U
n
>
· (1.0 +
CrvSatn
/100). If the
programmable curve is used this parameter must be calculated so that:
1MRK502052-UEN B
Section 9
Voltage protection
509
Technical manual
Содержание Relion REG670
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