DEMA CPM 310 G User Manual page 123

Latch Settings Menu
Main Screen » Menu »
Automatic Control Settings »
Latch Settings
Latch Settings Menu contains the controls that
determine the latching behavior of functions and
programmable outputs.
By default, the protection and auxiliary timer functions
do not latch the Trip Relay or the other relays that they
are appointed to; similarly, programmable outputs do
not latch when activated by any functions. When a
function is needed to latch the Trip Relay, or the
programmable relays that they are appointed to; or a
programmable output relay is needed to be latched
regardless of the function that triggers it, the related
option on the Latch Settings Menu must be set as
Active
. As seen on the pictures on the left, all latch
Passive
options are set as
Functions that can latch Trip Relay, or the
programmable relays that they are appointed to, are
listed below:
tI> Time delay trip due to phase overcurrent I>.
tI>> Time delay trip due to phase overcurrent I>>.
tI>>> Time delay trip due to phase overcurrent I>>>.
tI > Time delay trip due to earth overcurrent I
e
tI >> Time delay trip due to earth overcurrent I
e
tI >>> Time delay trip due to earth overcurrent
e
I >>>.
e
tI< Time delay trip due to undercurrent I<.
tI > Time delay trip due to negative sequence I
2
tI >> Time delay trip due to negative sequence I
2
Thermal Trip Θ Trip due to thermal protection.
Broken Conductor Trip due to broken conductor.
tAux1 Trip due to auxiliary timer no.1.
tAux2 Trip due to auxiliary timer no.2.
Buchholz Trip Trip due to power transformer buchholz
signal.
Temperature Trip Trip due to power transformer
temperature signal.
Pressure Trip Trip due to power transformer pressure
signal.
Note that deleting the alarms on the Alarm Menu via
the DigiConnect PC program would also result in the
release of the latched relays. ↺
- 123 -
by default.
>.
e
>>.
e
>.
2
>>.
2