CYG PRS-7367 - General function block

Protection Functions
PRS-7367 161
3.32.3 Application Scope
Mechanical protection is based on fault information characterized by mechanical binary inputs,
such as temperature, oil speed, pressure and so on. The mechanical protection includes gas
protection, pressure protection, temperature protection, oil level protection and so on.
3.32.4 Settings
In the following table, i is the protection stage number, it can be set according to the requirements.
Table 3.32-3 MP settings
No.
Name
Values(Range
)
Unit
Step
Default
Description
1
MP_i_Op_Ena
0-1
-
-
1
Enable: The output of MP is MP_Op;
Disable: The output of MP is MP_Alm
2
MP_i _T
0.08 - 200.00
s
0.01
200.00
Operate time delay
3.33 General function block
3.33.1 IDMT curves for over quantity protection
The inverse-time modes, the operation time depends on the momentary value of the quantity
(such as fault current or voltage): the higher the quantity, the faster the operation time. The
operation time calculation starts immediately when the quantity exceeds the set Start value.
User can select the operating characteristic from various inverse-time characteristic curves by
setting Curve_Type (=0,1, 2, 3, 4 or 5), and parameters of available characteristics for selection
are listed in the following table.
Table 3.33-1 Curve parameters for IEC IDMT curves
Curve_Type
Curve name
A
B
p
0
Definite time
-
-
-
1
IEC Normal inverse
0.14
0
0.02
2
IEC Very inverse
13.5
0
1.0
3
IEC Extremely inverse
80.0
0
2.0
4
IEC Long-time inverse
120.0
0
1.0
5
Programmable user-defined
-
-
-
If the Curve_Type = 1, 2, 3, 4, the Curve type is IEC Inverse-time mode and the time duration can
be calculated according to the formula:
s
()
( / ) 1
p
A
t B k
GG
  

Where: