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Voltage Sag Detection Relay
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VSDR
VSDR is one of the most
comprehensive voltage sag
detection relay on the market
that take
into account of both
essential parameters in a
voltage sag event ”V level and
duration. By using two groups
of programmable settings,
VSDR can be customized
into two groups of independent
set points to deal with two
different voltage sag levels and
durations according to
customer”¦s requirement.
”@
Half-Cycle Detection
Different with most of the
under-voltage detection relays
in the market, the fully
digitized VSDR contains no
analogue trimmer for adjusting
the settings, therefore can
accurately detect any voltage
sag event up to half cycle
without drifting problem due to
ambient issues (e.g.
temperature). Besides, with such
a fast respond time, vital and
sensitive equipment can gain
more time to react to the
operational requirement under
voltage sag event.
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Typical Application
For that equipment, which does
not comply with voltage sag
immunity standards, will easily
lock-up itself under voltage sag
event and require manual reset.
By using VSDR, any voltage sag
event beyond any set point of
VSDR will trigger the VSDR”¦s
build-in alarm contacts to
operate. This alarm contacts
can be used to incorporate with
the control circuit for
auto-shutdown or auto-reset the
equipment after the voltage sag
event and it can prevent the
equipment from being locked-up. |
