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Edit Configuration
52
4.7.4.5 EARTH FAULT
IEEE 37.2 -51 AC time overcurrent relay (shutdown / electrical trip)
When the module is suitably connected using the ‘Earth Fault CT’. The module measures Earth Fault and can
optionally be configured to generate an alarm condition when a specified level is surpassed.
If the
Earth Fault alarm
is enabled, the DSE8600 Series 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 Earth Fault, 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 earth current measured
I
s
is the trip setting
I
S (Trip setting)
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 ...