Zero sequence voltage Uo
Earth fault signalisation
Resistor’s connection
Switch-on delay
Switch-on
time
Transient
earth
fault time
t
Repeat time
Repeat delay
X number cycle repeats
Figure 84: Time lapse the resistor control; Standard without transient suppression
Zero sequence voltage Uo
Earth fault signalisation
Resistor’s connection
Switch-on
delay
Switch-on time
Transient
earth
fault time
t
Repeat time
Repeat delay
X number cycle repeats
Figure 85: Time lapse the resistor control; Standard with transient suppression
The resistor's connection can also triggered through binary input serial connection
to the SCADA system.
If the resistor's connection triggered manually through binary input the serial SCADA
connection, the connection will established after the switch-on delay has lapsed.Page 118 Detailed description REG-DP/ REG-DPA parameters
We take care it. The thermal overheating the resistor reported.
. the resistor risks overheating, the REG-DP/ REG-DPA will
prevent from switching on.
Monitoring the resistor's rise temperature through thermal model means that the re-
sistor can tested before switched again determine whether its limit
temperature has been exceeded. full impulse sequence can only run once the resistor has
cooled down sufficiently. The
connection will also established the event manual triggering even earth fault
did not occur
