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Edit Configuration
50
4.7.4.3 SHORT CIRCUIT
IEEE 37.2 -51 AC time overcurrent relay (shutdown / electrical trip)
For overload conditions caused by a short circuit, the overcurrent alarm is not fast enough to protect the
system. The Short Circuit alarm performs this protection.
If the
Short Circuit alarm
is enabled, and the current is excessive, the DSE controller begins following the
IDMT ‘curve’. If the
Trip
is surpassed for an excess amount of time the Alarm triggers (
Shutdown
or
Electric
trip
as selected in
Action
).
The higher the short circuit current, the faster the trip. The speed of the trip is dependent upon the fixed
formula:
T = K x 0.14 / ((I / I
s
)
0.02
-1)
Where:
T is the tripping time in seconds (accurate to +/- 5% or +/-
50ms (whichever is the greater)
K is the time multiplier setting
I is the actual current measured
I
s
is the trip setting value
I
S (Trip setting value)
K
(time multiplier setting)
Содержание DSE8810
Страница 117: ...Edit Configuration 117 Actions Drive a PLC function Write a value to a Gencomm register Reset an alarm ...
Страница 126: ...Scada 126 5 8 2 POWER Shows the module measurements of the supply power ...
Страница 134: ...Scada 134 5 12 STATUS Shows the module s current status ...
Страница 144: ...Scada 144 5 19 COMMUNICATIONS INFORMATION Shows the module s communication ports settings ...
Страница 146: ...Scada 146 5 20 1 DATA LOG STATUS Shows the memory status of the data log allocated space ...
Страница 148: ...This Page Is Intentionally Left Blank 148 ...