Woodward easYgen-3000XT Series, Manual, Page: 435 / 1205

ID Parameter CL Setting range
[Default]
Description
96.01 LM: Flag 1, 96.02 LM: Flag
2, ..., 96.32 LM: Flag 32
4.5.1.4.2 Generator Inverse Time-Overcurrent ANSI# IEC 255
General notes
The current produced by the generator is monitored depending on how parameter
"Generator current measuring" (parameter
╚═▷ 1850 ) is configured. If an overcurrent
condition is detected, the fault recognition time is determined by the configured tripping
characteristic curve and the measured current.
The tripping time is faster as the measured current increases in magnitude according to a
defined curve. According to IEC 255 three different characteristics are available.
If this protective function is triggered, the display indicates "Inv. time overcurr." and the
logical command variable "06.22" will be enabled.
• "Normal inverse" characteristic: •
t = 0.14 / (I/I
P
)
0.02
- 1) * t
P
[s]
• "Highly inverse" characteristic: •
t = 13.5 / (I/I
P
) - 1) * t
P
[s]
• "Extremely inverse" characteristic: •
t = 80 / (I/I
P
)
2
- 1) * t
P
[s]
Variables:
• t =tripping time •
• t
P
= setting value time •
• I = measured fault current •
• I
P
= setting value current •
Please take into account during configuration:
• for I
start
: •
I
start
> I
n
and I
start
> I
P
• for I
P
the smaller I
P
is, the steeper is the slope of the tripping curve •
The maximum tripping time is 327 s. If a tripping time greater than 327 s is configured,
an overcurrent fault condition will not be recognized.
435 easYgen-3000XT Series B37574
4 Configuration
4.5.1.4.2 Generator Inverse Time-Overcurrent ANSI# IEC 255
Released