DPR-03 relay is a three-phase (line to line)
voltage protection relay designed to be used for
over-voltage, under-voltage and phase rotation
protection in distribution substations, generators,
motors, transformers and capacitors in
compensation systems.
It offers adjustable over / under voltage limits
together with adjustable trip and reset delays. The
unit has also phase sequence protection.
Both over voltage limit(Max) and under voltage
limit(Min) can be adjusted or disabled via
trimmers on the front panel of the device. Delay
timers are adjusted through related trimmers.
VOLTAGE PROTECTION
If any of phase voltages goes over the set MAX
limit, the
”
U>
” led turns on and the adjusted Delay
timer starts to count. If the fault condition
disappears before the Delay timer expires, then
the
”
U>
” led turns off. If the fault condition persists
until the expiration of the Delay timer, the relay
output is deactivated
and the “
OUT
” led turns off.
If any of measured voltages goes below the set
MIN limit, the
”
U<
” led turns on and the adjusted
Delay timer starts to count. If the fault condition
disappears before the Delay timer expires, then
the
”
U<
” led turns off. If the fault condition persists
until the expiration of the Delay timer, the relay
output is deactivated
and the “
OUT
” led turns off.
When the MAX or MIN Voltage trimmer is
adjusted to the
”
OFF
” position, the related voltage
protection will be disabled.
When all voltages are again within adjusted MIN-
MAX limits,
”
U<
” and “
U>
” leds turn off and the
adjusted Reset Delay timer starts to count. When
the timer is expired, the relay output is activated
and the
”
OUT
” led turns on.
PHASE FAILURE PROTECTION
If the voltage of any phase falls below 65% of the
nominal value, then
”
U<
” led turns on and
immediately the relay output is deactivated and
the “
OUT
” led turns off.
OVERVOLTAGE PROTECTION
If the any phase voltage goes 50% above the
nominal value, then
”
U>
” led turns on and
immediately the relay output is deactivated and
the “
OUT
” led turns off.
PHASE SEQUENCE PROTECTION
If the phase sequence is reversed, both
“
U<
” and
“
U>
” leds flash, the relay output is deactivated
and the “
OUT
” led turns off.
* Electrical equipment should be installed only by
qualified specialist. No responsibility is assured by
the manufacturer or any of its subsidiaries for any
consequences resulting from the non-compliance
to these instructions.
* Check the unit for cracks and damages due to
transportation. Do not install damaged equipment.
* Do not open the unit. There is no serviceable
parts inside.
* Fuses of fast type (FF) with a maximum rating of
6A must be connected to phase voltage inputs, in
close proximity of the unit.
* Disconnect all power before working on
equipment.
* When the unit is connected to the network do
not touch terminals.
* Any electrical parameter applied to the device
must be in the range specified in the user manual.
* Do not try to clean the device with solvent or the
like. Only clean with a dump cloth.
* Do not allow water to come inside the unit.
* Verify correct terminal connections before
applying power.
* Only for DIN rail mounting.
Before installation:
Read this manual carefully, determine the
correct connection diagram.
Make sure to use adequate fuses.
Do not subject the unit to water spill.
Below conditions may damage the device:
Incorrect connections.
Incorrect power supply voltage.
Overload or short circuit at relay outputs
Power supply frequency out of specified limits
Do not install the unit close to high
electromagnetic noise emitting devices like
contactors, high current busbars, switchmode
power supplies and the like. Although the unit
is protected against electromagnetic
disturbances, excessive disturbance can affect
the operation and measurement precision.
Use adequate cable section, at least 0.75mm
2
(AWG18).
OPERATION
Do not overload relay
outputs. Use extra
contactors if required.
ELECTRICAL INSTALLATION
PRE-INSTALLATION
SAFETY NOTICE
Failure to follow below
instructions will result in
death or serious injury
DPR-03 VOLTAGE
PROTECTION RELAY
(LINE TO LINE)