Locking prevents resistor from continuously trying switch when high impedance or
restriking earth faults occur.
Default setting: s
0 Locking:
If locking active (ON), the resistor prevented from switching again after the first au-
tomatic residual current increase after the earth fault starts.
On the one hand, this increases the number possible manual switch-on procedures for
the resistor for high impedance earth faults.1 Temperature behaviour the resistor (thermal image)
The thermal model uses the value for Une estimate the temperature inside the resistor.: (R:10)
11.
On the other hand, protects the resistor from overheating and blocks the resistor control
in the REG-DP/ REG-DPA.3.
The resistor control can reset automatic mode through binary input serial con-
nection. The function for the binary input R_auto_on.
0 Active
Activates the use the thermal image.
Ex.Page 121
Detailed description REG-DP/ REG-DPA parameters
Applies when the previous parameter set ON
It defines the time between the identification the earth fault and the disabling the re-
sistor.
Locking!
An active block the Locking parameter displayed brackets the regulator's display. The resistor control goes into
blocking mode. The algorithm determines when the resistor has cooled down
enough start another switch-on procedure.
The following settings for the used binary inputs and outputs can found under the menu
item Commissioning. When earth fault occurs, reduces the current the faulty section and increases
the chance extinguishing the arc.
If self-blocking set AUTO, the resistor control will automatically activated for the
next earth fault after the cool-down period. The information about the blocked state can queried and reported
through the BOF R_block. This considerably reduces the time the
next possible resistor switch-on time because the resistor longer blocked during the
whole cool-down period.3.
Default setting: (active when resistor control active)
