CN111009885B - Method for preventing lightning counterattack of power distribution cabinet - Google Patents
Method for preventing lightning counterattack of power distribution cabinet Download PDFInfo
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- CN111009885B CN111009885B CN201910984209.9A CN201910984209A CN111009885B CN 111009885 B CN111009885 B CN 111009885B CN 201910984209 A CN201910984209 A CN 201910984209A CN 111009885 B CN111009885 B CN 111009885B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a method for preventing lightning counterattack of a power distribution cabinet, belonging to the technical field of lightning protection of the power distribution cabinet, and the method comprises the following steps: an isolation transformer is arranged on a power supply wire of the power distribution cabinet, and a shielding layer is arranged between a secondary winding and a primary winding of the isolation transformer; when lightning strikes on the fan, the ground potential of a lightning strike point is raised, and the potential of the grounding side of the power distribution cabinet below the fan is raised along with the raising of the ground potential; when the potential of the grounding side of the power distribution cabinet rises, the high potential side of the power distribution cabinet rises synchronously; through setting up shielding layer ground connection, the switch board links to each other with secondary winding simultaneously, and the voltage difference that adds on the interior equipment of switch board is mains voltage forever, and the potential difference is invariable, eliminates the counterattack that the high potential difference of earth mat arouses, avoids causing equipment to damage. Through the equipotential technology and the reference potential floating technology, the potential reference point of a lightning stroke point is the power supply voltage reference point, the potential difference of two ends of equipment in the power distribution cabinet is constant, and the problem that the equipment in the cabinet is damaged due to lightning counterattack is solved.
Description
Technical Field
The invention relates to the technical field of lightning protection of power distribution cabinets, in particular to a method for preventing lightning counterattack of a power distribution cabinet.
Background
With the rapid development of electric power construction, single electric power equipment is larger, and the impact of lightning on the safe operation and the economic benefit of distribution equipment is increasingly prominent.
Years of researches on lightning stroke accidents of fans show that the lightning stroke accident rate of each hundred fans is as high as about 8% every year, and component systems which are easy to damage due to lightning stroke mainly comprise an electrical communication system, a control system, blades and a generator. Wherein, the probability of the control system is the maximum and is about 40 to 50 percent. The lightning strike damage of the fan control system is mainly concentrated on a PLC control module at the top and a control cabinet module at the bottom, which respectively account for 65% and 22% of the total failure rate of the control system, and the modules mainly control the yawing, hydraulic, variable pitch and system communication of the fan and play an important role in the safe operation of a single fan.
The height of the fan is generally over 100 meters, and the fan is mostly in open fields, hills or mountains and is easily influenced and damaged by the outside; the geological conditions of hilly and high mountain terrains where the fan is located are stable, the soil resistivity is high, the current leakage capacity is reduced, the lightning current cannot flow into the ground quickly, and the lightning counterattack accident is caused. The control system of wind turbine generator blades, a power distribution cabinet, the control system of a wind measuring tower, the control communication telemechanical system in a wind field, a power transmission line and electronic equipment are prone to failure caused by lightning stroke, mainly because the grounding resistance of the wind turbine generator and a power transmission tower grounding grid is high due to corrosion of severe environment, when the wind turbine generator and the power transmission tower are struck by lightning, the ground potential is raised to form counterattack overvoltage, and therefore fan equipment is damaged. The higher the ground resistance, the higher the resulting back-strike voltage and the greater the probability of causing damage to the device. At present, the measure of surge protector is adopted to well accuse and fan switch board cabinet, but surge protector is still taken place occasionally by the accident that thunder damaged, and control system is also fairly high because of the probability that thunderbolt damaged.
Aiming at the problems, a method for preventing the lightning counterattack of the power distribution cabinet is provided.
Disclosure of Invention
The invention aims to provide a method for preventing a power distribution cabinet from being counterstruck by thunder and lightning, which aims to solve the technical problems in the background technology. The lightning overvoltage in the method can not invade the weak current system power distribution cabinet through the low-voltage line, and the safety of equipment in the power distribution cabinet is ensured.
A method of preventing lightning from intruding into a power distribution cabinet, the method comprising the steps of:
step 1: an isolation transformer is arranged on a power supply wire of the power distribution cabinet, and a shielding layer is arranged between a secondary winding and a primary winding of the isolation transformer;
step 2: when lightning strikes on the fan, the ground potential of a lightning strike point is raised, and the potential of the grounding side of the power distribution cabinet below the fan is raised along with the raising of the ground potential;
and step 3: when the potential of the grounding side of the power distribution cabinet rises, the high potential side of the power distribution cabinet rises synchronously;
and 4, step 4: through setting up shielding layer ground connection, the switch board links to each other with secondary winding simultaneously, and the voltage difference that adds on the interior equipment of switch board is mains voltage forever, and the potential difference is invariable, eliminates the counterattack that the high potential difference of earth mat arouses, avoids causing equipment to damage.
Furthermore, a grounding capacitor is arranged at the bottom of the shielding layer, and the other end of the grounding capacitor is grounded.
Furthermore, a recoil device is arranged on a power transmission line between the isolation transformer and the power supply, an air gap of the recoil device is broken down, and the recoil device extinguishes impact flashover electric arcs caused by high potential difference.
Further, the recoil device comprises an arc guide electrode and a recoil pipe, the arc guide electrode is arranged on the power transmission line, the recoil pipe and the arc guide electrode are arranged in a gap mode, when the power transmission line is in a high point position, the gap is conducted, electric arcs are generated, and the recoil pipe introduces the electric arcs and recoils to weaken or extinguish the electric arcs.
Furthermore, the recoil pipe comprises a recoil pipe supporting body, a recoil channel, a skirt edge and a recoil electrode, the recoil channel is arranged in the recoil pipe supporting body, the top end of the recoil channel is provided with an opening, the bottom of the recoil channel is sealed, the recoil electrode is arranged at the bottom of the recoil channel, and the skirt edge is arranged on the outer side of the recoil pipe supporting body.
Furthermore, the bottom of the backflushing pipe support body is provided with an earthing electrode, and the earthing electrode is arranged as an inwards-concave metal internal thread hole and is connected with an earthing wire.
Furthermore, in the step 4, the lightning point potential is the power supply voltage reference potential, and the voltage difference between two sides of the power distribution cabinet is always kept constant through the isolation transformer and the equipotential technology, namely the power supply voltage value, so that the equipment damage caused by counterattack is avoided.
Furthermore, in step 4, an equipotential technology and a reference potential floating technology are formed through the arrangement of the isolation transformer, when the ground potential is raised due to lightning counterattack, the reference potential of the grounding end of the power distribution cabinet is also raised synchronously, and since the equipment in the power distribution cabinet is connected with the secondary side of the isolation transformer, the voltage difference applied to the equipment in the power distribution cabinet is always the power supply voltage, namely 220V, the equipotential technology is adopted to replace the ground grid to reduce the resistance, the lowest potential (reference potential) of the power distribution cabinet is the lightning point potential, the highest potential is the lightning point potential plus the power supply voltage value (220V), and the potential difference between the two is still 220V; the lightning strike point potential (reference potential) is floated, and the potential difference is constant, so that counterattack caused by high potential difference of the ground grid is eliminated.
Furthermore, the isolation transformer comprises a primary coil, a secondary coil, an iron core and a metal shielding layer, wherein the metal shielding layer is arranged between the primary coil and the secondary coil, is connected to the shell through a lead and is grounded, and divides the capacitance between the primary side and the secondary side into two parts, so that the shielding effect is achieved; in the case of a high system frequency, a high interference immunity can be achieved by adding an electrostatic shield.
Furthermore, the method for preventing the lightning from invading the power distribution cabinet is suitable for protecting the power distribution cabinet of the generator set from lightning counterattack.
By adopting the technical scheme, the invention has the following technical effects:
1. through equipotential technique and reference potential floating technique, realize that the thunderbolt point potential reference point is the power voltage reference point, both unify, the potential difference of equipment both ends is invariable in the switch board, has solved because of the thunder and lightning counterattack causes the problem that the equipment was broken in the cabinet.
2. The adoption of the equipotential technology and the reference potential floating technology ensures that the lightning counterattack protection does not depend on the ground screen resistor any more and is also irrelevant to the lightning intensity.
3. The technology can replace the existing surge protector, and the protection effect of lightning counterattack is better than that of the surge protector.
Drawings
Fig. 1 is a circuit diagram of a power distribution cabinet system of the invention.
Fig. 2 is a structural view of an isolation transformer according to the present invention.
Fig. 3 is a schematic diagram of a power distribution system counterattack.
FIG. 4 is a flow chart of the method of the present invention.
Fig. 5 is a schematic diagram of another configuration of the power distribution system of the present invention.
FIG. 6 is a schematic view of the recoil assembly of the present invention.
In the figure: 1-a fan; 2-a power distribution cabinet; 3-isolating the transformer; 3.1-secondary winding; 3.2-iron core; 3.3-primary winding; 3.4-shielding layer; 3.5-grounded capacitance; 4-a power supply; 5-a recoil device; 5.1-arc-conducting electrode; 5.2-backflushing the pipe; 5.21-backflush tube support; 5.22-recoil channel; 5.23-skirt; 5.24-ground electrode; 5.25-arc-striking electrode; 5.26-recoil electrode; 6-transmission line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
An embodiment of the invention is further described in accordance with the above-described principle description and with reference to fig. 1:
example 1:
a method of preventing lightning from intruding into a power distribution cabinet, the method comprising the steps of:
step 1: an isolation transformer 3 is arranged on a power supply line of the power distribution cabinet 2, and a shielding layer 3.4 is arranged between a secondary winding 3.3 and a primary winding 3.1 of the isolation transformer 3. The bottom of the shielding layer 3.4 is provided with a grounding capacitor 3.5, and the other end of the grounding capacitor 3.5 is grounded.
Step 2: when thunderbolt in the fan, the thunderbolt point ground potential is raised, and 2 ground connection side electric potentials of switch board below the fan are raised along with the ground potential. The isolation transformer 3 comprises a primary coil, a secondary coil, an iron core and a metal shielding layer, wherein the metal shielding layer is arranged between the primary coil and the secondary coil, the shielding layer is connected to the shell through a wire and is grounded, and the shielding layer 3.4 divides a capacitor between the primary side and the secondary side into two capacitors, so that a shielding effect is achieved; in the case of a high system frequency, a high interference immunity can be achieved by adding an electrostatic shield.
And step 3: when the potential of the grounding side of the power distribution cabinet 2 rises, the high potential side of the power distribution cabinet 2 rises synchronously.
And 4, step 4: through setting up shielding layer ground connection, switch board 2 links to each other with secondary winding simultaneously, and the voltage difference that adds on 2 interior equipment of switch board is mains voltage forever, and the potential difference is invariable, eliminates the counterattack that the high potential difference of earth mat arouses, avoids causing equipment to damage. The lightning point potential is a power supply voltage reference potential, and the voltage difference between two sides of the power distribution cabinet 2 is always kept constant through an isolation transformer and an equipotential technology, namely, the power supply voltage value, so that equipment damage caused by counterattack is avoided.
An equipotential technology and a reference potential floating technology are formed through the arrangement of an isolation transformer, when the ground potential is raised due to lightning counterattack, the reference potential of the grounding end of a power distribution cabinet 2 is also raised synchronously, and because equipment in the power distribution cabinet 2 is connected with the secondary side of the isolation transformer, the voltage difference of the equipment added in the power distribution cabinet 2 is always power supply voltage, namely 220V, the equipotential technology is adopted to replace grounding grid resistance reduction, the lowest potential (reference potential) of the power distribution cabinet 2 is the lightning stroke point potential, the highest potential is the lightning stroke point potential plus the power supply voltage value (220V), and the potential difference of the two is still 220V; the lightning strike point potential (reference potential) is floated, and the potential difference is constant, so that counterattack caused by high potential difference of the ground grid is eliminated.
The method for preventing the lightning from invading the power distribution cabinet 2 is suitable for the protection of the power distribution cabinet 2 of the generator set against the lightning.
Equipotential technique (reference potential floating):
if no isolation transformer is arranged between the power distribution cabinet 2 and an external power supply, when the fan is struck by lightning, the ground potential is raised to easily form counterattack overvoltage, so that equipment in the power distribution cabinet 2 and other control equipment are damaged. The higher the grounding resistance, the higher the back-strike overvoltage formed, and the greater the probability of causing equipment damage. Under the lightning counterattack overvoltage, the surge protector in the power distribution cabinet 2 is often damaged, so that the protection function is lost. The equipotential technology and the reference potential floating technology are adopted, through the arrangement of the isolation transformer, when the ground potential is raised due to lightning counterattack, the reference potential of the grounding end of the power distribution cabinet 2 is also raised synchronously, and because the equipment in the power distribution cabinet 2 is connected with the secondary side of the isolation transformer, the voltage difference of the equipment in the power distribution cabinet 2 is always the power voltage, namely 220V. Adopting an equipotential technology to replace the resistance reduction of a ground grid, wherein the lowest potential (reference potential) of the power distribution cabinet 2 is the potential of a lightning strike point, the highest potential is the potential of the lightning strike point plus the voltage value (220V) of a power supply, and the potential difference between the two is still 220V; the lightning strike point potential (reference potential) is floated, and the potential difference is constant, so that counterattack caused by high potential difference of the ground grid is eliminated.
An isolation transformer is a transformer in which an input winding and an output winding are electrically isolated from each other, and the transformation ratio of the isolation transformer is usually 1:1, and the isolation transformer mainly plays a role in: the primary side and the secondary side are completely electrically insulated, and the loop is also isolated. The power supply of the equipment in the wind power plant fan power distribution cabinet 2 is provided by an external 220V alternating current power supply, and the isolation transformer is arranged between the 220V alternating current power supply and the power distribution cabinet 2, so that the transmission of electric energy (the voltage of a primary side is equal to that of a secondary side) can be realized, and an electric channel between a primary coil and a secondary coil can be blocked.
Structure of the isolation transformer 3: primary coil, secondary coil, iron core, metal shielding layer. The common low-voltage isolation transformer is mainly formed by coating insulating paint on the outer surface of a metal winding coil and then winding a primary coil and a secondary coil on the same iron core. The metal shielding layer is arranged between the primary coil and the secondary coil, and the shielding layer is connected to the shell through a lead and is grounded. The function of the shielding layer is as follows: the shielding layer divides the capacitance between the primary side and the secondary side into two parts, so that the shielding effect is achieved; in the case of a high system frequency, a high interference immunity can be achieved by adding an electrostatic shield.
Further, the method is not limited to lightning counterattack protection of the fan power distribution cabinet 2, and is also applicable to lightning counterattack protection of the power distribution cabinets 2 of other generator sets.
As shown in fig. 1, the power supply of the equipment in the power distribution cabinet 2 of the fan 1 is provided by an external 220V ac power supply, and the isolation transformer 3 is arranged between the 220V ac power supply and the power distribution cabinet 2, so that not only can the transmission of electric energy be realized (the voltage of the primary side and the voltage of the secondary side are equal), but also the electric channel between the primary coil 4 and the secondary coil 5 can be blocked.
As shown in fig. 2, the structure of the isolation transformer 3: primary coil 4, secondary coil 5, iron core 6, metal shielding layer 7. The conventional low-voltage isolation transformer 3 is mainly formed by coating insulating paint on the outside of a metal winding coil and then winding a primary coil and a secondary coil on the same iron core. The metal shielding layer 7 is arranged between the primary coil and the secondary coil, and the shielding layer is connected to the shell through a lead and is grounded. Function of the shielding layer 7: the shielding layer divides the capacitance between the primary side 4 and the secondary side 5 into two parts, so that the shielding effect is achieved; in the case of a high system frequency, a high interference immunity can be achieved by adding an electrostatic shield.
As shown in fig. 3, the equipotential technology and the reference potential floating technology are adopted, and through the arrangement of the isolation transformer 3, after the ground potential is raised due to the lightning counterattack, the reference potential of the grounding end of the power distribution cabinet 2 is also raised synchronously, and because the equipment in the power distribution cabinet is connected with the secondary side of the isolation transformer, the voltage difference of the equipment in the power distribution cabinet is always the power voltage, namely 220V. Adopting an equipotential technology to replace the resistance reduction of a ground grid, wherein the lowest potential (reference potential) of the power distribution cabinet 2 is a lightning potential, the highest potential is the lightning potential plus a power supply voltage value (220V), and the potential difference between the two is still 220V; the lightning strike potential (reference potential) is floating and the potential difference is constant, thus eliminating counterattack caused by high potential difference of the ground grid.
Example 2:
as shown in fig. 5-6, a recoil device 5 is arranged on a transmission line 6 between the isolation transformer 3 and the power supply 4, an air gap of the recoil device 5 is broken down, and the recoil device 5 extinguishes an impact flashover arc caused by high potential difference. The backflushing device 5 comprises an arc guide electrode 5.1 and a backflushing pipe 5.2, the arc guide electrode 5.1 is arranged on the power transmission line 6, the backflushing pipe 5.2 and the arc guide electrode 5.1 are arranged in a gap mode, when the power transmission line 6 is in a high point position, the gap is conducted, electric arcs are generated, and the backflushing pipe 5.2 introduces the electric arcs and backflushes to weaken or extinguish the electric arcs. The recoil pipe 5.2 comprises a recoil pipe support body 5.21, a recoil channel 5.22, a skirt 5.23 and a recoil electrode 5.24, the recoil channel 5.22 is arranged in the recoil pipe support body 5.21, the top end of the recoil channel 5.22 is provided with an opening, the bottom of the recoil channel is sealed, the recoil electrode 5.1 is arranged at the bottom of the recoil channel 5.22, and the skirt 5.23 is arranged at the outer side of the recoil pipe support body 5.21. And the bottom of the recoil pipe supporting body 5.21 is provided with an earthing electrode, and the earthing electrode is an inwards-sunken metal internal thread hole and is connected with an earthing wire.
The number of the skirt edges 5.23 is several, the skirt edges are arranged on the outer side of the recoil pipe supporting body 5.21 at equal intervals, and the skirt edges 5.23 are of circular arc structures. The recoil electrode 5.26 is made of a metal material, and the recoil electrode 5.26 is of a hemispherical structure or a spherical structure. The number of skirts 5.23 is typically 5-7 and the distance provided is typically 60 mm.
When flashover occurs, the arc striking electrode 5.25 forms an ascending pilot by physical touch, coulomb force action and point discharge on a flashover arc, the arc is dragged to an inner inlet of the recoil channel 5.22, an outer arc enters the superfine recoil channel 5.22 under the action of the lightning receiving electrode, and the inner diameter of the recoil channel 5.22 is far smaller than the diameter of the arc.
The material of the wall of the recoil pipe 5.2 needs to be high-strength, high-temperature-resistant and high-pressure-resistant insulating material, such as ceramic and the like. The high-strength high-temperature-resistant high-pressure-resistant non-conductive material is made of any one of alloy ceramic, rare earth ceramic, graphene-ceramic composite material, organic ceramic, synthetic silicone rubber, organic insulating material, alloy glass, rare earth glass, graphene glass and organic glass. The material has the characteristic of high arc extinction threshold, and is made of a high-strength, high-temperature-resistant and high-pressure-resistant non-conductive material, so that the burning temperature is higher.
The arc column is filled by the narrow pipe in the recoil channel 5.22, the arc generates elastic deformation, the radial deformation of the arc is converted into axial deformation, and the axial elastic force of the arc is improved.
The electric arc is limited by the pipe wall in the recoil channel 5.22, the diameter of the arc column is forcibly reduced, so that the conductive cross section area of the whole electric arc is reduced, the electric arc resistance is increased, and the power calculation formula is as follows: p ═ I2R, it is known that the arc power also increases, and the heat and temperature in the tube increase.
The inlet electric arc and the outlet electric arc generate 180-degree opposite impact collision in the tube, so that channels of electric arc radiation, convection, conduction and loss are cut off, heat dissipation is blocked, and the temperature is further increased; at the same time, the density of the arc plasma in the tube is greatly increased, the friction and collision among particles are accelerated, and the heat and the temperature are increased again.
The temperature difference between the inside and the outside of the recoil pipe is increased, so that the pressure difference is increased, when the pressure in the recoil pipe is greater than the pressure outside the pipe, the directional electric arc explosion effect from inside to outside is generated, and the explosion effect causes the electric arc discharge: on the one hand, the arc in the tube is rapidly evacuated; and on the other hand, the outer arc cavity effect blocks the injection of the energy of the outer arc.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (6)
1. A method for preventing lightning from invading a power distribution cabinet is characterized in that the method comprises the following steps:
step 1: an isolation transformer is arranged on a power supply wire of the power distribution cabinet, and a shielding layer is arranged between a secondary winding and a primary winding of the isolation transformer;
step 2: when lightning strikes on the fan, the ground potential of a lightning strike point is raised, and the potential of the grounding side of the power distribution cabinet below the fan is raised along with the raising of the ground potential;
and step 3: when the potential of the grounding side of the power distribution cabinet rises, the high potential side of the power distribution cabinet rises synchronously;
and 4, step 4: by arranging the shielding layer for grounding, meanwhile, the power distribution cabinet is connected with the secondary winding, the voltage difference of equipment in the power distribution cabinet is always power voltage, the potential difference is constant, counterattack caused by high potential difference of a ground grid is eliminated, and equipment damage is avoided;
a recoil device is arranged on a power transmission line between the isolation transformer and the power supply, an air gap of the recoil device is broken down, and the recoil device extinguishes an impact flashover arc caused by high potential difference;
the recoil device comprises an arc guide electrode and a recoil pipe, the arc guide electrode is arranged on the power transmission line, the recoil pipe and the arc guide electrode are arranged in a clearance mode, when the power transmission line is at a high point position, the clearance is conducted to generate electric arcs, and the electric arcs are introduced into the recoil pipe and are recoiled to weaken or extinguish the electric arcs;
the recoil pipe comprises a recoil pipe supporting body, a recoil channel, a skirt edge and a recoil electrode, the recoil channel is arranged in the recoil pipe supporting body, the top end of the recoil channel is provided with an opening, the bottom of the recoil channel is closed, the recoil electrode is arranged at the bottom of the recoil channel, and the skirt edge is arranged on the outer side of the recoil pipe supporting body;
and the bottom of the backflushing pipe support body is provided with an earthing electrode, and the earthing electrode is an inwards-sunken metal internal thread hole and is connected with an earthing wire.
2. The method for preventing lightning from invading power distribution cabinet according to claim 1, characterized in that: and a grounding capacitor is arranged at the bottom of the shielding layer, and the other end of the grounding capacitor is grounded.
3. The method for preventing lightning from invading power distribution cabinet according to claim 1, characterized in that: in the step 4, the lightning point potential is the power supply voltage reference potential, and the voltage difference between two sides of the power distribution cabinet is always kept constant through the isolation transformer and equipotential technology, namely the power supply voltage value, so that equipment damage caused by counterattack is avoided.
4. The method for preventing lightning from invading power distribution cabinet according to claim 1, characterized in that: in the step 4, an equipotential technology and a reference potential floating technology are formed through the arrangement of the isolation transformer, when the ground potential is raised due to lightning counterattack, the reference potential of the grounding end of the power distribution cabinet is also raised synchronously, and as the equipment in the power distribution cabinet is connected with the secondary side of the isolation transformer, the voltage difference applied to the equipment in the power distribution cabinet is always the power supply voltage, namely 220V, the equipotential technology is adopted to replace the ground grid resistance reduction, the lowest potential of the power distribution cabinet is the lightning point potential, the highest potential is the lightning point potential plus the power supply voltage value, and the potential difference between the two is still 220V; the lightning strike point potential is floating, and the potential difference is constant, so that counterattack caused by high potential difference of the ground grid is eliminated.
5. The method for preventing lightning from invading power distribution cabinet according to claim 1, characterized in that: the isolation transformer comprises a primary coil, a secondary coil, an iron core and a metal shielding layer, wherein the metal shielding layer is arranged between the primary coil and the secondary coil, is connected to the shell through a wire and is grounded, and divides two capacitors between the primary side and the secondary side into two capacitors to play a role in shielding; when the system frequency is high, high anti-interference performance can be obtained by adding the electrostatic shielding.
6. The method for preventing lightning from invading power distribution cabinet according to claim 1, characterized in that: the method for preventing the lightning from invading the power distribution cabinet is suitable for protecting the power distribution cabinet of the generator set against lightning counterattack.
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