Seg WI Series User Manual

◦ Time multiplier/tripping characteristic factor. The setting range depends on the◦
selected tripping curve.
◦ Setting via [Protection Para / I2>] »tChar«◦
For all inverse-time characteristics (i. e. all curves except the DEFT), there are two minimum
trip delays, and independent of the selected characteristic will the actual trip delay never be
smaller than any of these two minimum delays.
• »I2> . tMin« is a minimum delay settable by the user. So, this is simply a timer that•
is triggered independent of the inverse-time curve and that has to elapse before the
protection stage trips. If it is set to 0 seconds it is deactivated. (See also ╚═▷ “4.6.2
Current Unbalance Protection – Settings via DiggiMEC or via Smart view”.)
• Another minimum delay, t
Dyn.Lim.
, results from a calculated “knee-point” of the•
characteristic. This means it is dependent on a particular current value on the curve,
I
Dyn.Lim.
. The e󰊞ective trip delay does never fall below t
Dyn.Lim.
, independent of the
actual value of I2.
◦
I
Dyn.Lim.
is de󰊟ned as the smallest value out of 20⋅In and 20⋅I
2>
(EF Curve:
◦
30⋅I
2>
).
◦ Then t
Dyn.Lim.
is the delay time that is calculated from this I
Dyn.Lim.
based on◦
the selected characteristic.
◦ (The diagram of each characteristic curve shows this “knee-point”, assuming◦
the example value I
Dyn.Lim.
= 20⋅I
2>
[EF Curve: 30⋅I
2>
].)
309WIC1WIC1-1.0-EN-MAN
11 Appendix
11.2.3 Characteristics »I2>«

Seg WI Series Specifications

General

Brand	Seg
Model	WI Series
Category	Relays
Language	English