DEEP SEA ELECTRONICS DSE7400 - Short Circuit

Edit Configuration - Mains
67
4.8.4.2 SHORT CIRCUIT
IEEE 37.2 -51 AC Time Overcurrent Relay (shutdown / electrical trip)
If the Short Circuit alarm is enabled, the DSE7400 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 Short Circuit, 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)