When multiple diesel genset supply power to
the same load, in order to ensure the reasonable distribution of load,
the reliability of power supply and the operation economy of the genset,
it is necessary to connect the power of multiple diesel generator sets
in parallel. At this time, the parallel cabinet must be equipped. When
different AC power sources need to be connected in parallel to give the
same load, AC power must meet the following conditions: same phase
sequence, same voltage, same frequency and same phase.
The genset control system parallel cabinet has the following functions:
1.The
system is set up automatic synchronizing device, which can control
engine speed to allows the two generators to automatically synchronize
and automatically control the main switch closing grid. After grid
successfully, synchronizer automatically quits work. This operation is
safe and reliable, main switch has electric operation device.
2.After
the system is paralleled, the automatic power distributor measures the
current and effective value of power of each genset. Through a group of
parallel signal lines, it can continuously control the speed system, so
as to evenly distribute the load of each generator according to the
proportion of generator power.
3.The
automatic voltage regulator and reactive power balance device can
automatically adjust the output voltage of the two gensets to make the
no-load and on load consistent.
4.It can start by manual or backup way, two generators can be prime unit and standby unit.
5.With
short circuit and over-current protection function, reverse rate
protection (when the reverse power is 6-15% of the rated power, the main
switch opens to protect the generator). The parallel is soft load, and
the unloading is soft (the train is opened only after the load
transfer), and the floating charging (intelligent charger) of the diesel
engine start-up battery is performed.
6.Control
method. Manually press the start button to start the genset, and select
single power supply or two parallel power supply according to the load.
In automatic mode, the system will automatically start the unit when it
detects that the power supply is cut off (the set time for power
transmission is 15 seconds). When the load of the first unit reaches 80%
of the rated load, the second unit will be started automatically( the
first load can be adjusted from 50% to 90%, the system is set to 80%,
and two units can beset to start at the same time).
After
normal operation, it can automatically adjust the synchronous closing
and grid connection. After grid connection, it can automatically
distribute the load equally according to the unit power without manual
adjustment. When the load is reduced to 80% of the unit power (50% - 90%
adjustable), the system will automatically send the signal of unit
reduction, and the second unit will automatically turn off the circuit
breaker for no-load maintenance operation for 2 minutes, and then
automatically shut down and enter the standby state.
In
the manual mode, when the unit does not need automatic power supply or
the automatic system is temporarily out of control, it has the functions
of manual operation of unit startup, parallel operation and shutdown.
7.Display function
Chinese
and English can be switchable. LCD displays the speed of diesel engine,
oil pressure, water temperature, battery voltage, running time,
generating voltage, three-phase current, power factor, active power,
frequency, etc.
8.Indicator light status indication: closing
indication, opening indication, on-line signal indication, operation
indication, power supply indication, mains failure indication, alarm
indication and reverse power indication.
9.Genset
protection:overspeed, low speed, low oil pressure, over water
temperature, high voltage, over current, high frequency, over power,
etc.
10.Protection function: the genset has such protection
functions as too high cooling water temperature, too high oil
temperature, too low oil pressure and too high speed. The protection
parameter limits are as follows:
A.When the speed exceeds 1725r/min, it will give an alarm and stop when the speed exceeds 1755r/min.
B.When the oil temperature exceeds 115 ℃ ± 1 ℃, it will give an alarm. When over 117 ℃ ± 1 ℃, the genset will shutdown.
C.When coolant temperature exceeds 97±1℃, it will give an alarm, will shutdown if over 99±1℃.
D.When lub. oil temperature lower than 0.1±0.01MPa, it will give an alarm. When lower than 0.07MPa.
Above
technical specifications is about parallel cabinet for diesel power
generator manufactured by Dingbo Power company. Our parallel cabinet can
be customizable according to different clients requirements.
Dingbo Power company
is also a manufacturer of diesel generators in China, founded in 2006.
All product has passed CE and ISO certificate. We have Cummins, Volvo,
Perkins, Yuchai, Shangchai, Weichai, MTU, Ricardo, Wuxi power etc.,
power range is from 25kva to 3125kva. Contact us by email
dingbo@dieselgeneratortech.com.
