What Is Reactive Power in Diesel Generator
by Starlight Generator dieselgeneratortechReactive power is more
abstract. It is used for electric field and magnetic field in the circuit, and
to establish and maintain the electric power of magnetic field in electrical
equipment. For electrical equipment with electromagnetic coils, reactive power
must be consumed in order to establish magnetic field. Inductive or capacitive
components are consumers and providers of reactive power.
Secondly, usually
somebody think of reactive power, maybe think it is useless, of course, there
also are some harms in reactive power.
1.Reduce the output of
generator active power, the reason is that the total capacity of the generator
(the apparent power) is constant. If the reactive power is too much, the active
power will be reduced accordingly, otherwise the generator will overload.
2.Reducing the power
supply capacity of transmission and substation equipment, same as diesel power
generator.
3.Causing the line
voltage loss to increase, the reactive current component in the circuit
increases, and the total current increases. Voltage drop: δU=IZ, voltage drop
is proportional to current, and the line voltage drop increases. It is
necessary to increase the section of the line accordingly, resulting in an
increase in investment.
Then, here is some harms
from reactive power. Whatever it is, there will always be bad and good. So, we
still can benefit from reactive power of diesel generator.
1.Many electrical
equipment work according to the principle of electromagnetic induction, such as
distribution transformer, motor, etc. The motor needs to establish and maintain
a rotating magnetic field to make the rotor rotate, thus driving the mechanical
movement. The rotor magnetic field of the motor is established by obtaining
reactive power from the power supply.
2.Transformers also need
reactive power in order to make the primary coil of the transformer produce
magnetic field and induce voltage in the secondary coil.
Therefore, without
reactive power, the motor will not rotate, the transformer will not change
voltage, and the AC contactor will not suck in. It can be seen that reactive
power plays an auxiliary role in the process of energy conversion and voltage
transformation. Without reactive power, it is impossible to establish magnetic
field and convert electrical energy into mechanical energy.
Rotor and motor is one
of spare parts in diesel generator set, so reactive power is an important role
for diesel genset.
Finally, we already are
benefited from reactive power. Without reactive power there would be no active
power in most of our well known electrical machines.
Reactive power actually
paves the way for the active power to be delivered. Reactive power is
responsible to establish the magnetic flux in AC generators (aka alternators)
which in turn, sets the output voltage to the desired level.
Induction motors
transfer active power to the rotor by means of the reactive power “consumed”
(exchanged between the stator and the mains) by the stator. The reactive power
establishes the rotating magnetic field who drags the rotor, hence transforming
the active power into rotary mechanical power.
Antennae, induction
ovens, motors, transformers, microwave ovens, cellphones, radios, TV’s and all
sort of communication apparatuses makes use of reactive power to pave the way
to deliver active power, in terms of mechanical power, electrical power, heat,
information etc.
Likewise, capacitors can
exchange reactive power by establishing an electrical field. Capacitors and
inductors have very important rules in electrical and electronics circuitry.
In general, you can
think about reactive power in analogy to the seats in an aircraft. Seats don’t
make money for the airline, but passengers do. Passengers are the active power
to be transported, but they require seats to be seated.
The aircraft can fly empty, at its lowest efficiency factor, but it can also fly full, at its highest efficiency factor. It’s just an arithmetical percentage calculation.
Likewise, with a fundamental mathematical difference, electrical circuits can operate at a desired power factor, which is a vectorial relation between active and reactive power.
We should remember that reactive power is not useless power, reactive power is beneficial and harmful. When we design it, we try to eliminate its harmfulness. This involves the problem of reactive power compensation. Hope next time, we can share how to do reactive power compensation.
Starlight Power is a
very professional supplier and manufacturer of diesel generator, whatever in
technical support or after-sales, they are very professional. More importantly,
in terms of product quality, they are also very popular in overseas markets. If
possible, welcome to contact us, we believe you will satisfied.
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Created on Sep 5th 2019 02:21. Viewed 325 times.