Deep Sea Electronics Plc DSE8810 Software Manual

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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)

Deep Sea Electronics Plc DSE8810 Specifications

General

Brand	Deep Sea Electronics Plc
Model	DSE8810
Category	Controller
Language	English