Description of Non-Source Corona Field Lightning Drive
Device
I. Product principle
A lightning protection device is an electrical apparatus designed to
safeguard electrical equipment from high transient overvoltage hazards
while limiting the duration of current flow and regulating discharge
parameters. As a critical component of lightning protection systems, it
consists of three main elements: an ionization unit with multiple
pointed electrodes positioned above the protected structure, a ground
level current collection system embedded in the soil, and connecting
wires linking these components. The ionization unit maintains near
ground potential within thundercloud electric fields. When the intensity
of the thundercloud's electric field surges, the resulting potential
difference between this unit and adjacent air causes ionization near the
needle tips of air particles, generating substantial space charges.
Typically, the lower layer of thunderclouds carries negative charges,
while induced positive charges accumulate at the ground surface. These
ionized negative charges are absorbed by the current collection system,
whereas the positive charges attract and neutralize the negative
charges from the thundercloud, thereby achieving effective lightning
dissipation.
A lightning rod system consists of three components: an ionization
unit, connecting wires, and grounding equipment. It operates on the
principle of spark discharge from a metal needle electrode. When
lightning clouds generate an electric field, the needle's surface
becomes electrically charged. As the electric field strength reaches a
critical threshold, surrounding air molecules become ionized and
disperse under the electric field's influence, while new air molecules
gradually replace them. This continuous process creates an ionic
current flowing from the needle electrode to the surrounding enviro
nment. The ionic current increases exponentially with rising potential.
When lightning strikes the lightning rod or protected structures, both
the rod and nearby ground become electrically charged with opposite
polarity to the cloud's charge. The ionization unit contains multiple
needle electrodes that release massive charges into the ground. These
charges travel toward the thundercloud under the electric field's
influence, neutralizing the cloud's charge and weakening the lightning
field. This mechanism effectively prevents objects from being struck by
lightning.
II: Product features:
1.Composed of a metal lightning rod;
2. Adopt the fan arrangement, radiation arrangement or parallel
arrangement;
3. The semiconductor resistance of each lightning rod should be 35KΩ
plus or minus 10%;
4. Each lightning rod should be able to withstand three voltage shocks
of more than 1100KV;
5. The impulse discharge voltage between the tops of two adjacent
lightning rods should be approximately equal to 900kv;
6. Strong wind resistance, can resist 45m/s wind;
III: Product Description:
1: multi-gap lightning arrester with high arc quenching capability;
2: It has multiple gaps or arc extinguishing gaps, which are composed
of a main gap and many small gaps connected in series. The gap
exposed to the atmosphere is called the main gap, and the multi
chambered gap is installed in an insulated rod made of special
materials Gap formation;
3: low lightning protection level and large current capacity, which can
withstand direct lightning attack;
4: simple structure, small size and light weight;
5: Easy to install and maintenance free;
6: can operate in harsh environment, not afraid of pollution;
7: good insulation coordination with the protected equipment, strong
arc extinguishing ability, not easy to cause circuit breaker trip;
8: low discharge voltage and small dispersion, no cutoff wave is
generated during operation, strong protection performance;
9: It has the characteristics of lightning attraction and lightning current
into the ground of ordinary lightning rod:
10: Limit the sharp rise of lightning current, effectively reduce the
amplitude and steepness of lightning current, and reduce the secondary
effects caused by lightning induction:
11: Strong ability to withstand lightning, self-recovery function,
maintenance free, long life.
IV: Technical requirements and performance parameters
1、 performance parameter
The lightning protection device utilizes an array of multi-pin "tip
like effect" electrodes. Under the influence of thundercloud electric
fields, it releases corona ions that form a protective shield over the
protected object. This shielding mechanism inhibits the initiation of
upward leader currents, slows the propagation of downward leader
currents, and prevents the formation of discharge channels between
thunderclouds and the ground. Consequently, it effectively prevents
cloud-to-ground flashover within protected areas while avoiding issues
such as strong electromagnetic pulse radiation, induced overvoltage,
and potential counterstrikes caused by lightning current discharge.
The structure of the lightning rod device is shown in Figure 1, which
should be composed of discharge needle, discharge cylinder, support,
supporting insulator and ball support. It also includes a universal base
(suitable for all types of poles and towers), and is equipped with a
current detection system with data wireless transmission function.
Figure 1 Schematic Diagram of Lightning Rod Structure
The lightning rod device should have enough protection range,
and its protection characteristics are shown in Figure 2:
Figure 2 Schematic Diagram of Lightning Rod
Protection Range
Ground protection radius r (m):
r=10h
(1)
Where: h is the height of the lightning rod
installation (m)
On the plane of the protected object height hx
(m), the protection radius rx (m) is: rx=10 (h—
hx)
（2）