Sices D-PRO, Техническое руководство

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D-PRO Protection relay Technical Manual 39
- (I / P.0352) = S is the ratio between the current and the maximum current.
K and P values are given by the following table:
IEC Curve K P
Extremely Inverse 80.0 2.0
Very Inverse 13.5 1.0
ANSI Curve
– Extremely inverse and Very Inverse
Time-dependant current protection (it activates as much quickly as higher the current overload
is). The curves that can be used are called
EXTREMELY INVERSE and VERY INVERSE .
They are configured as genset protections as they set a limit to the thermal accumulation of
the genset when supplying. As engine protection, you must use the maximum power one,
which is independent from the load type. For further details, refer to EAAN005602.pdf.
The equation for the ANSI curves is the following:






− 













+
−






=
9
5 ) 0353 . 14 (
1
0352 .
P
B
P
I
K
T
P
Where:
- I represents the current in the circuit.
- P.0353 is the time dial (TMS) set and it must have a value between 1 and 10.
- (I / P.0352) = S is the ratio between the current and the maximum current.
K, P and B values are given by the following table:
ANSI Curve K D B
Extremely Inverse 6.407 2.0 0,025
Very Inverse 2,855 2.0 0.0712
Type: Alarm
Measuring: V1-V2-V3 Phase voltages
Related parameters: P.0101 Genset phases number
P.0102 Genset nominal voltage
P.0323 Maximum voltage threshold
P.0324 Maximum voltage delay
To disable: P.0324=0
The protection is enabled only in case of absence of the disabling digital input (usually
combined to the circuit breaker status).