A device and method for testing the lightning protection effect of a passive corona field lightning drive

Abstract

The present invention relates to a device and a method for testing the lightning protection effect of a passive corona field lightning driver, and belongs to the field of lightning protection technology. It includes six line-type zinc oxide lightning arresters, a passive corona field lightning driver, a lightning early warning device, an online lightning monitoring counter, and an online current monitoring counter installed on a line tower; wherein the passive corona field lightning driver and the lightning early warning device are installed on both sides of the top of the tower, the six line-type zinc oxide lightning arresters are respectively installed between the six-phase conductors and the conductor crossarms, the six line-type zinc oxide lightning arresters each correspond to an online lightning monitoring counter, the line-type zinc oxide lightning arrester communicates with the online lightning monitoring counter through a first connecting line, and the passive corona field lightning driver communicates with the online current monitoring counter through a second connecting line. The present invention can realize the inspection of the lightning protection effect of the passive corona field lightning driver, and make up for the deficiency that the laboratory cannot simulate the high voltage test under natural rain conditions.

Description

Technical Field

[0001] The invention relates to a device and a method for testing the lightning protection effect of a passive corona field lightning drive device, belonging to the technical field of lightning protection. Background Art

[0002] There are various structures of lightning drive devices on the market, such as the invention patent application with publication number CN112260065A, entitled "A passive pulse excitation corona field lightning drive device". The invention patent with authorization announcement number CN113991432B, entitled "A lightning drive system with a lightning warning device and its use method". The invention patent with authorization announcement number CN111740314B, entitled "A passive corona field lightning drive device for high-speed rail". The invention patent application with publication number CN109687294A, entitled "An active corona field lightning drive device".

[0003] None of the above four patent applications involve simulation test verification of the lightning repelling effect under natural rain conditions. The drift of wind and rain in the air and the presence of inhomogeneous media in the air make the trajectory of lightning an irregular curve. Therefore, the trajectory of natural lightning is random; only in rainy weather can lightning develop downward along the rain and eventually discharge to the earth. According to existing literature records: the linear discharge process of lightning can usually be divided into three stages: leader, main discharge and residual light. When the electric field strength at the densely charged part of the thundercloud reaches 2500-3000kV / m, the downward discharge will first appear, which is called leader discharge. The downward leader will split into several branches during development, which is related to the random ion clusters originally present in the air. When the downward leader approaches the ground, the more protruding part of the ground will begin to emit upward discharge towards it, which is called a head-on leader. The head-on leader can be one or more. When one of the oncoming leaders meets one of the downward leaders, a strong neutralization effect will occur, and a very large current (10-1000kA) will appear, accompanied by flashes and thunder. This is the main discharge stage of the thundercloud discharge. The main discharge process develops from bottom to top against the channel of the downward leader; it ends when the main discharge reaches the thundercloud. Then the residual charge in the cloud flows down through the main discharge channel, which is called the afterglow stage. Due to the large resistance in the cloud, the current corresponding to the afterglow stage is not large (100-1000A), but it lasts for a long time (0.03-0.15s). The lightning current is equivalent to a high-frequency shock wave with a very short duration. First, it is dispersed by the contact surface between the grounding body and the soil, and second, according to the tip discharge phenomenon, it relies on the tip discharge of multiple grounding electrodes and the end of the horizontal grounding body to the earth.

[0004] The China Electrical Equipment Industry Association standard "Corona Field Lightning Driving Equipment and Safety Requirements for Its Installation and Use (T / CEEIA311-2018)" introduces the principle of corona field lightning driving equipment in the introduction: when the induced high voltage is gradually formed between the cloud layer and the tip component during the formation of lightning, the corona field lightning driving equipment uses the tip-like effect of the array of multiple needles to generate ion flow to reduce the electric field strength to the ground formed by the accumulation of charge in the cloud layer; the corona field lightning driving equipment has its own electric field strength dozens of times higher than the protected target but dozens of times lower than the traditional lightning rod, which inhibits the formation of the upward leader, weakens or shields the formation of the downward leader, thereby blocking the channel for lightning formation, realizing regional lightning protection and achieving the purpose of lightning driving. The above viewpoints also do not involve simulation test verification under natural rain conditions.

[0005] Lightning tripping of 110kV and above transmission lines is mainly caused by shielding failure, so line-type zinc oxide lightning arresters play a key role in solving shielding failure; however, the practice of introducing lightning current into the ground wire and tower will inevitably raise the potential of the conductor cross arm due to the failure to solve the very high grounding resistance, thereby causing the counter-flashover of other phase insulator strings on the tower. In order to solve the counter-flash, zinc oxide lightning arresters must also be installed on other phase conductors on the same tower; the zinc oxide lightning arrester will inevitably raise the conductor potential in the process of solving the counter-flash, thereby causing the insulator strings of adjacent towers to flashover. Therefore, whether it is shielding failure or counter-flash, it is necessary to reduce the grounding resistance of the tower. In the case of not effectively solving the very high grounding resistance, a line-type zinc oxide lightning arrester will move the flashover point to other phase insulator strings on the same tower (caused by shielding failure) or insulator strings on other towers (caused by counter-flash), which may transfer the accident location and expand the scope of the accident; at the same time, measures to reduce the grounding resistance of the tower and the use of line-type zinc oxide lightning arresters can achieve the purpose of guiding lightning damage. Through the analysis of engineering examples, when the grounding resistance of the tower is not very large, and the grounding resistance of the flashover-prone tower is smaller than that of the adjacent tower, it is sufficient to install one set of line-type zinc oxide arresters on the lightning-prone tower at the same time, and there is no need to install line-type zinc oxide arresters on the adjacent towers.

[0006] Therefore, it is urgent to design a device and a method for installing a lightning warning device, a corona field lightning driving equipment and a line-type zinc oxide lightning arrester on the same pole tower, so as to effectively test the lightning protection effect of the passive corona field lightning driver. Summary of the invention

[0007] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a device and method for testing the lightning protection effect of a passive corona field lightning driver.

[0008] The invention discloses a device for testing the lightning protection effect of a passive corona field lightning driver. The device is special in that it comprises six line-type zinc oxide lightning arresters 2, a passive corona field lightning driver 3, a lightning early warning device 4, an online lightning monitoring counter 5, and an online current monitoring counter 7 installed on a line tower 1; wherein the passive corona field lightning driver 3 and the lightning early warning device 4 are installed on both sides of the top of the tower 1, the six line-type zinc oxide lightning arresters 2 are respectively installed between a six-phase conductor 9 and a conductor cross arm 10, the six line-type zinc oxide lightning arresters 2 each correspond to an online lightning monitoring counter 5, the line-type zinc oxide lightning arrester 2 communicates with the online lightning monitoring counter 5 through a first connecting line 6, and the passive corona field lightning driver 3 communicates with the online current monitoring counter 7 through a second connecting line 8.

[0009] A method for testing the lightning protection effect of a passive corona field lightning drive device, which is special in that it includes the following steps:

[0010] 1) Installed on the line tower 1 of 220kV and above voltage level, the specific installation positions are: 1 set of passive corona field lightning drive 3 and 1 set of lightning warning device 4 are installed on both sides of the top of the tower 1 respectively, six line-type zinc oxide lightning arresters 2 are installed between the six-phase conductors 9 and the conductor crossarms 10 respectively, six online lightning monitoring counters 5 and 1 online current monitoring counter 7 are installed on the line tower 1 about 4m above the ground.

[0011] 2) Debug the lightning warning device 4, the online current monitoring counter 7, and the online lightning monitoring counter 5 respectively to make them in normal working condition;

[0012] 3) If the lightning warning device 4 sends out a real-time signal of field strength distortion, but the online current monitoring counter 7 and the online lightning monitoring counter 5 do not work, it means that the lightning conductor in the overhead transmission line is struck by direct lightning, but no lightning strike is caused to the conductor, indicating that the passive corona field lightning repellent 3 does not have a lightning repelling effect;

[0013] 4) If the lightning warning device 4 sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, and the online lightning monitoring counter 5 is activated, it means that the passive corona field lightning drive device 3 has no lightning drive effect;

[0014] 5) If the lightning warning device 4 sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, but the online lightning monitoring counter 5 is not activated, it means that the passive corona field lightning repellent 3 has a lightning repelling effect.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention adopts the method of installing a passive corona field lightning driver and a lightning early warning device on the top of a 220kV or higher voltage level pole tower on which a line-type zinc oxide lightning arrester and an online lightning monitoring counter have been installed, so as to make it possible to test the lightning driving effect of the passive corona field lightning driver.

[0017] 2. The present invention adopts the method of installing a passive corona field lightning driver and a lightning early warning device on the top of a 220kV and above voltage level pole tower on which a line-type zinc oxide lightning arrester and an online lightning monitoring counter have been installed. Even if the passive corona field lightning driver does not have a lightning driving effect, it can still play the role of a lightning rod and a lightning side rod.

[0018] 3. The present invention adopts data judgment through online monitoring of lightning early warning device, current monitoring counter and lightning monitoring counter: if the lightning early warning device sends out a real-time signal of field strength distortion, and the online current monitoring counter and the online lightning monitoring counter are not activated, it means that the lightning conductor in the overhead transmission line is struck by direct lightning, and no counter-attack is caused to the conductor, and the passive corona field lightning driver does not play a lightning driving effect; if the lightning early warning device sends out a real-time signal of field strength distortion, the online current monitoring counter is activated, and the online lightning monitoring counter is activated, it means that the passive corona field lightning driver does not play a lightning driving effect; if the lightning early warning device sends out a real-time signal of field strength distortion, the online current monitoring counter is activated, and the online lightning monitoring counter is activated, it means that the passive corona field lightning driver does not play a lightning driving effect.

[0019] The invention can realize the inspection of the lightning protection effect of the passive corona field lightning drive, and therefore has wide promotion value. The invention has an ingenious structure, is simple and effective, and can make up for the deficiency that the laboratory cannot simulate the high voltage test under natural rain conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a device for testing the lightning protection effect of a passive corona field lightning drive according to the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1As shown, a device for testing the lightning protection effect of a passive corona field lightning driver comprises six line-type zinc oxide lightning arresters 2, a passive corona field lightning driver 3, a lightning early warning device 4, an online lightning monitoring counter 5, and an online current monitoring counter 7 installed on a line tower 1; wherein the passive corona field lightning driver 3 and the lightning early warning device 4 are installed on both sides of the top of the tower 1, the six line-type zinc oxide lightning arresters 2 are respectively installed between the six-phase conductors 9 and the conductor crossarms 10, the six line-type zinc oxide lightning arresters 2 each correspond to an online lightning monitoring counter 5, the line-type zinc oxide lightning arrester 2 communicates with the online lightning monitoring counter 5 through a first connecting line 6, and the passive corona field lightning driver 3 communicates with the online current monitoring counter 7 through a second connecting line 8. Whether the passive corona field lightning driver 3 is playing a role in driving lightning is determined by the real-time signal of field strength distortion in the air recorded by the lightning early warning device 4 and the counts of the online current monitoring counter and the online lightning monitoring counter 5; if the lightning early warning device 4 sends out a real-time signal of field strength distortion, and the online current monitoring counter 7 and the online lightning monitoring counter 5 are both inactive, it means that the lightning conductor in the overhead transmission line is struck by direct lightning, and no counter-attack is caused to the conductor, and the passive corona field lightning driver 3 does not play a role in driving lightning; if the lightning early warning device sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, and the online lightning monitoring counter 5 is activated, it means that the passive corona field lightning driver 3 does not play a role in driving lightning; if the lightning early warning device sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, and the online lightning monitoring counter 5 is activated, it means that the passive corona field lightning driver 3 does not play a role in driving lightning; if the lightning early warning device sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, and the online lightning monitoring counter 5 is inactive, it means that the passive corona field lightning driver 3 plays a role in driving lightning.

[0023] A method for testing a device for testing the lightning protection effect of a passive corona field lightning drive device in this embodiment includes the following steps:

[0024] 1) According to the differentiated lightning protection design guidelines for power grids, lightning rods and lightning side rods can be installed on lines with voltage levels of 220kV and above, and lightning side rods should not be installed on lines with voltage levels of 110kV and below. The device for testing the lightning protection effect of the passive corona field lightning drive in this embodiment can only select the tower 1 of the line with voltage levels of 220kV and above for testing; even if the passive corona field lightning drive does not have a lightning driving effect, it can also play the role of a lightning rod and a lightning side rod.

[0025] 2) Select a 220kV or higher voltage level line tower 1 that has been installed with a line-type zinc oxide arrester and an online lightning monitoring counter, and determine on site whether a passive corona field lightning drive 3 and a lightning warning device 4 can be installed on the top of the tower;

[0026] 3) After the passive corona field lightning driver 3 and the lightning warning device 4 are installed, the lightning warning device 4, the online current monitoring counter 7 and the online lightning monitoring counter 5 are debugged respectively to make them in normal working state;

[0027] 4) Online monitoring lightning warning device 4 and online lightning monitoring counter 5;

[0028] 5) If the lightning warning device 4 sends out a real-time signal of field strength distortion, and the online current monitoring counter 7 and the online lightning monitoring counter 5 do not work, it means that the lightning conductor in the overhead transmission line is struck by direct lightning, but no counter-strike is caused to the conductor, and the passive corona field lightning repellent 3 does not play a lightning repelling effect;

[0029] 6) If the lightning warning device 4 sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, and the online lightning monitoring counter 5 is activated, it means that the passive corona field lightning drive device 3 has no lightning drive effect;

[0030] 7) If the lightning warning device 4 sends out a real-time signal of field strength distortion, the online current monitoring counter 7 is activated, but the online lightning monitoring counter 5 is not activated, it means that the passive corona field lightning repellent 3 has a lightning repelling effect.

[0031] It should be understood that the parts not elaborated in detail in this specification belong to the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing the lightning protection effect of a passive corona field lightning drive device, characterized in that The device comprises six line-type zinc oxide lightning arresters, a passive corona field lightning driver, a lightning early warning device, an online lightning monitoring counter, and an online current monitoring counter installed on the line tower; wherein the passive corona field lightning driver and the lightning early warning device are installed on both sides of the top of the tower, the six line-type zinc oxide lightning arresters are respectively installed between the six-phase conductors and the conductor crossarms, the six line-type zinc oxide lightning arresters each correspond to an online lightning monitoring counter, the line-type zinc oxide lightning arrester communicates with the online lightning monitoring counter via a first connecting line, and the passive corona field lightning driver communicates with the online current monitoring counter via a second connecting line; The method comprises the following steps: 1) Install on line towers with voltage levels above 220kV. The specific installation locations are: 1 set of passive corona field lightning drive and 1 set of lightning warning device are installed on both sides of the top of the tower, 6 line-type zinc oxide lightning arresters are installed between the six-phase conductors and the conductor crossarms, 6 online lightning monitoring counters and 1 online current monitoring counter are installed on the line tower about 4m above the ground; 2) Debug the lightning warning device, online current monitoring counter, and online lightning monitoring counter respectively to ensure that they are in normal working condition; 3) If the lightning warning device sends out a real-time signal of field strength distortion, but the online current monitoring counter and the online lightning monitoring counter do not work, it means that the lightning conductor in the overhead transmission line has been struck by direct lightning, but no lightning strike has been caused to the conductor, indicating that the passive corona field lightning repellent has not achieved the lightning repelling effect; 4) If the lightning warning device sends out a real-time signal of field strength distortion, the online current monitoring counter is activated, and the online lightning monitoring counter is activated, it means that the passive corona field lightning repellent does not have a lightning repelling effect; 5) If the lightning warning device sends out a real-time signal of field strength distortion, the online current monitoring counter works, but the online lightning monitoring counter does not work, it means that the passive corona field lightning repellent has a lightning repelling effect.

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