CN112526301A - High-conductivity under-fog line impact tolerance characteristic test platform and evaluation method - Google Patents
High-conductivity under-fog line impact tolerance characteristic test platform and evaluation method Download PDFInfo
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Abstract
The invention provides a high-conductivity under-fog line impact tolerance characteristic test platform which comprises an upper computer, an impact voltage generation controller, a data acquisition device, an impact voltage generator, a coaxial cable, a high-voltage probe, a current sensor, a first base tower, a second base tower, a first lightning conductor, an A-phase line, an A-phase insulator string of the first base tower, a high-conductivity fog control device, an ultrasonic fog generation device, a high-conductivity solution, a first conductivity meter, a condensing device and a second conductivity meter, wherein the test platform performs impact tolerance experiments on lines to obtain experiment data; the invention also provides an evaluation method for the line impact tolerance characteristics under the high-conductivity fog, and the evaluation method evaluates according to the comprehensive evaluation factors for the line impact tolerance characteristics calculated by the experimental data. The invention considers the influence of high-conductivity fog environment on the impact tolerance characteristic of the line, and provides important guarantee for improving the safe and stable operation of the line.
Description
Technical Field
The invention relates to the field of line impact tolerance characteristic evaluation, in particular to a high-conductivity under-fog line impact tolerance characteristic test platform and an evaluation method.
Background
With the development of economy, activities such as human industrial production and the like cause continuous pollution to the environment, and high-conductivity fog such as salt fog, acid fog and the like sometimes occurs. When the power transmission line is in high-conductivity fog such as salt fog and acid fog, the impact tolerance characteristic of the power transmission line can also be changed remarkably. The existence of high-conductivity fog and the combined action of dirt on the surface of the insulator can cause the impact voltage-resistant level of the power transmission line to be greatly reduced, so that a strong discharge phenomenon is generated, and further, the insulator of the power transmission line is subjected to flashover, and the power transmission line is subjected to accidents such as tripping and the like. Therefore, the research on the influence of high-conductivity fog such as salt fog and acid fog in the dirty area on the impact tolerance characteristic of the power transmission line has great significance for improving the impact tolerance characteristic of the power transmission line and ensuring the safe and stable operation of the power transmission network.
The impact resistance of the transmission line conductor in salt mist and acid mist environments is closely related to the conductivity level of mist around the conductor. The number of free electrons in the high conductivity mist is increased compared to the clean mist, so that its impact resistance properties are significantly weakened. Therefore, under the action of the impulse voltage, the research on the relevance between the conductivity levels of the salt mist and the acid mist and the impulse tolerance characteristics of the power transmission line is of great significance. At present, the domestic research on the impact tolerance characteristics of the power transmission line mainly focuses on the solid pollution research on the power transmission line, and the research on the power transmission line under the influence of high-conductivity fog such as salt fog and acid fog is less. In order to accurately analyze the impact tolerance characteristics of the power transmission line under the influence of high-conductivity fog, an evaluation test method for the impact tolerance characteristics of the power transmission line under different conductivity fog levels is urgently needed, and the impact tolerance characteristics of the power transmission line are tested and analyzed under different conductivity fog levels and are used for evaluating the impact tolerance characteristics of a power transmission system in a salt fog and acid fog frequent region.
Chinese patent CN104090218B published in 2016, 9, 28 discloses a method for effectively evaluating the surface contamination insulation state of an insulator of a power transmission line. According to the method, the distribution rule of the ash density/equivalent salt density ratio of the live-line operation insulator is statistically analyzed, and the quantitative relation between the pollution flashover voltage of the live-line operation insulator and the equivalent salt density and ash density on the surface of the live-line operation insulator is obtained through experimental research; and comprehensively considering factors such as pollution flashover voltage with 50% flashover probability, insulator string type, highest operation voltage of the power transmission line and the like, drawing a graph of the safe region of the pollution degree of the insulator of the power transmission line, and obtaining the safe regions of various pollution degrees. Although the method can accurately and intuitively evaluate the safety area of the pollution degree of the insulator of the power transmission line, the influence of solid pollution on the characteristics of the power transmission line is only considered, and the influence of high-conductivity fog on the impact tolerance characteristics of the power transmission line is not researched.
Disclosure of Invention
The invention provides a test platform and an evaluation method for the impact tolerance characteristics of a high-conductivity fog-below line, aiming at overcoming the defect that the prior art does not relate to the impact tolerance characteristics of a high-conductivity fog-below power transmission line.
The technical scheme of the invention is as follows:
the invention provides a test platform for the impact tolerance characteristic of a high-conductivity under-fog line, which comprises: the device comprises an upper computer, an impulse voltage generation controller, a data acquisition unit, an impulse voltage generator, a coaxial cable, a high-voltage probe, a current sensor, a first base tower, a second base tower, a first lightning conductor, an A-phase line, a first base tower A-phase insulator string, a test box, a high-conductivity fog control device, an ultrasonic fog generation device, a first conductivity meter, a high-conductivity solution, a pipeline, a condensing device and a second conductivity meter;
The first base tower, the second base tower and the condensing device are arranged in the test box, and the ultrasonic fog generating device is arranged on the surface of the test box;
the ultrasonic fog generating device is connected with the high-conductivity fog control device, and the high-conductivity solution is converted into high-conductivity fog through a pipeline and sprayed into the test chamber under the control of the high-conductivity fog control device;
the first conductivity meter is connected with the high-conductivity fog control device and used for measuring the conductivity of the high-conductivity solution and transmitting the conductivity of the high-conductivity solution to the high-conductivity fog control device;
the condensing device is used for receiving the liquefied fog in the test chamber and is connected with the high-conductivity fog control device through a second conductivity meter; the second conductivity meter is used for measuring the conductivity of the liquefied fog and transmitting the conductivity of the liquefied fog to the high-conductivity fog control device;
the high-conductivity fog control device is also connected with the upper computer, receives an instruction of the upper computer and transmits the conductivity of the solution and the conductivity of the liquefied fog to the upper computer;
the two ends of the first lightning conductor and the A-phase line are respectively connected with a first base tower and a second base tower;
the output end of the impulse voltage generator is connected to the phase A circuit through a coaxial cable, the control end of the impulse voltage generator is connected with the upper computer through an impulse voltage generation controller, and the upper computer controls the impulse voltage generation controller to change the output voltage of the impulse voltage generator;
The high-voltage probe is connected with two ends of the A-phase insulator string of the first base tower and is connected with an upper computer through a data acquisition unit;
the current sensor is sleeved on the coaxial cable and is connected with the upper computer through the data acquisition unit.
Preferably, the test platform further comprises a dehumidifying air extractor; the dehumidifying and air-extracting device is connected with the high-conductivity fog control device, and air extraction and dehumidification are carried out on the test chamber under the control of the high-conductivity fog control device.
Preferably, the model number of the A-phase insulator string of the first base tower is XP-70.
The invention also provides a method for evaluating the impact tolerance characteristic of the high-conductivity under-fog line, which is based on the established test platform and comprises the following steps of:
s1: the ultrasonic fog generating device converts the high-conductivity solution into high-conductivity fog to be sprayed into the test box, the first conductivity meter measures the conductivity gamma of the high-conductivity solution, and the gamma is sent to the upper computer through the high-conductivity fog control device;
s2: the second conductivity meter measures the conductivity gamma of the liquefied fog received by the condensing device in real time1And gamma is1Sending the mist to an upper computer through a high-conductivity mist control device;
s3: the upper computer receives the gamma and the gamma 1Making a judgment when gamma is1When γ is reached, step S4 is performed;
s4: the upper computer opens the impulse voltage generator through the impulse voltage generation controller, outputs impulse voltage to the phase A line, adjusts the impulse voltage according to the state of the phase A insulator string of the first base tower and performs an impulse tolerance experiment; the current sensor collects an impact current I on the coaxial cable and transmits the impact current I to the upper computer;
s5: calculating a line overshoot tolerance characteristic primary judging factor k by an upper computer1；
S6: the upper computer calculates a line impact tolerance characteristic comprehensive evaluation factor k;
s7: and the upper computer evaluates the line impact tolerance characteristic according to the line impact tolerance characteristic comprehensive evaluation factor k in S6.
Preferably, the specific steps of S4 are:
s4.1: the upper computer opens the impulse voltage generator through the impulse voltage generation controller, and the impulse voltage generator outputs impulse voltage to the phase A line through the coaxial cable; meanwhile, the high-voltage probe collects voltages at two ends of the A-phase insulator string of the first base tower and transmits the voltages to an upper computer through a data collector, and the upper computer judges whether flashover occurs to the A-phase insulator string of the first base tower or not;
s4.2: if the A-phase insulator string of the first base tower does not have flashover, the upper computer raises the impulse voltage output by the impulse voltage generator through the impulse voltage generation controller until the A-phase insulator string of the first base tower just has flashover;
If the A-phase insulator string of the first base tower is subjected to flashover, the upper computer reduces the impulse voltage output by the impulse voltage generator through the impulse voltage generation controller until the A-phase insulator string of the first base tower is not subjected to flashover;
s4.3: the impact current I of the coaxial cable collected by the current sensor is transmitted to the upper computer through the data collector.
Preferably, the line overshoot tolerance characteristic primary evaluation factor k in S51Calculated by the following formula:
wherein α represents a protection angle,/cRepresents the horizontal distance l of the A-phase line from the axis of the towergcRepresents the horizontal distance, h, of the first lightning conductor from the A-phase linegcRepresents the vertical distance, h, of the first lightning conductor from the A-phase linecThe method comprises the steps of representing the ground clearance height of an A-phase line, representing the number of insulator pieces of the A-phase insulator string of the first base tower, representing the equivalent salt density of the insulators of the A-phase insulator string of the first base tower, representing impact current, and representing the conductivity of a high-conductivity solution.
Preferably, the line impact resistance characteristic comprehensive evaluation factor k in S6 is calculated by the following formula:
wherein, P1Represents a benchmark evaluation factor one, P2Represents a benchmark evaluation factor two, lcRepresents the horizontal distance h of the A-phase line from the axis of the tower cRepresenting the ground clearance of the phase A circuit, n representing the number of insulator pieces of the phase A insulator string of the first base tower, and S representing the insulation of the phase A insulator string of the first base towerSub-equivalent salt deposit density, I represents impact current, gamma represents high conductivity solution conductivity, and k1And a first-level judgment factor representing the overshoot tolerance characteristic of the line.
Preferably, in S7, the evaluating method specifically includes:
when k belongs to (0, 1), the line impact resistance is weaker;
when k ∈ (1, + ∞), the line surge withstand characteristic is strong, and the line surge withstand characteristic is strong as the k value is larger.
Preferably, the method further comprises the steps of:
s8: after the evaluation is finished, the upper computer controls the dehumidifying air extractor to evacuate the high-conductivity fog in the test box through the high-conductivity fog control device.
Preferably, the method further comprises the steps of:
s9: and after the high-conductivity fog in the test chamber is evacuated, replacing the high-conductivity solution with different conductivity, repeating the steps S1-S8, and carrying out a line impact resistance characteristic test under the influence of the high-conductivity fog.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a test platform and an evaluation method for the impact tolerance characteristics of a line under high-conductivity fog aiming at areas with multiple salt fog and acid fog, wherein the line is subjected to an impact tolerance experiment based on the test platform, and the evaluation method evaluates the comprehensive evaluation factors of the impact tolerance characteristics of the line calculated according to experimental data; the invention considers the influence of high-conductivity fog environment on the impact tolerance characteristic of the line, and provides important guarantee for improving the safe and stable operation of the line.
Drawings
FIG. 1 is a block diagram of a test platform for testing the impact resistance of a high conductivity line under fog as described in example 1;
in the figure: 1-an upper computer, 2-an impulse voltage generation controller, 3-a data collector, 4-an impulse voltage generator, 5-a coaxial cable, 8-a first base tower, 9-a second base tower, 15-a first base tower A-phase insulator string, 31-a first lightning conductor, 41-a-phase circuit, 51-a high-voltage probe, 54-a current sensor, 60-a test box, 61-a high-conductivity fog control device, 62-an ultrasonic fog generation device, 63-a first conductivity meter, 64-a high-conductivity solution, 65-a condensation device, 66-a second conductivity meter, 67-a dehumidification air extraction device and 73-a pipeline.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a test platform for testing line impact resistance under high conductivity fog, as shown in fig. 1, the test platform includes: the device comprises an upper computer 1, an impulse voltage generation controller 2, a data acquisition unit 3, an impulse voltage generator 4, a coaxial cable 5, a high-voltage probe 51, a current sensor 54, a first base tower 8, a second base tower 9, a first lightning conductor 31, an A-phase circuit 41, a first base tower A-phase insulator string 15, a test box 60, a high-conductivity fog control device 61, an ultrasonic fog generation device 62, a first conductivity meter 63, a high-conductivity solution 64, a pipeline 73, a condensation device 65 and a second conductivity meter 66;
The first base tower 8, the second base tower 9 and the condensing device 65 are arranged in the test box 60, and the ultrasonic fog generating device 62 is arranged on the surface of the test box 60;
the ultrasonic fog generating device 62 is connected with the high-conductivity fog control device 61, and under the control of the high-conductivity fog control device 61, the high-conductivity solution 64 is converted into high-conductivity fog through the pipeline 73 and is sprayed into the test box 60;
the first conductivity meter 63 is connected with the high-conductivity fog control device 61, and the first conductivity meter 63 is used for measuring the conductivity of the high-conductivity solution 64 and transmitting the conductivity of the high-conductivity solution 64 to the high-conductivity fog control device 61;
the condensing device 65 is used for receiving the liquefied fog in the test chamber 60 and is connected with the high-conductivity fog control device 61 through a second conductivity meter 66; the second conductivity meter 66 is used for measuring the conductivity of the liquefied mist and transmitting the conductivity of the liquefied mist to the high-conductivity mist control device 61;
the high-conductivity fog control device 61 is also connected with the upper computer 1, receives an instruction of the upper computer 1, and transmits the solution conductivity and the liquefied fog conductivity to the upper computer 1;
two ends of the first lightning conductor 31, the second lightning conductor 32, the A-phase line 41, the B-phase line 42 and the C-phase line 43 are respectively connected with the first base tower 8 and the second base tower 9;
The output end of the impulse voltage generator 4 is connected to the phase A line 41 through a coaxial cable 5, the control end is connected with the upper computer 1 through an impulse voltage generation controller 2, and the upper computer 1 changes the output voltage of the impulse voltage generator 4 through controlling the impulse voltage generation controller 2;
the high-voltage probe 51 is connected with two ends of the first base tower A-phase insulator string 15 and is connected with the upper computer 1 through the data acquisition unit 3;
the current sensor 54 is sleeved on the coaxial cable 5 and is connected with the upper computer 1 through the data collector 3.
The test platform further comprises a dehumidifying air extractor 67; the dehumidifying and air-extracting device 67 is connected with the high-conductivity fog control device 61, and is used for extracting air and dehumidifying the test box 60 under the control of the high-conductivity fog control device 61.
The model of the A-phase insulator string 15 of the first base tower is XP-70.
Example 2
The embodiment provides a method for evaluating the impact resistance characteristic of a line under high-conductivity fog, which comprises the following steps:
s1: the ultrasonic fog generating device 62 converts the high-conductivity solution 64 into high-conductivity fog to be sprayed into the test box 60, the first conductivity meter 63 measures the conductivity gamma of the high-conductivity solution 64, and the gamma is sent to the upper computer 1 through the high-conductivity fog control device 61;
S2: the second conductivity meter 66 measures the conductivity gamma of the liquefied mist received by the condensing device 65 in real time1And gamma is1Sent to the upper computer 1 through the high conductivity mist control device 61;
s3: the upper computer 1 receives gamma and gamma1Making a judgment when gamma is1When γ is reached, step S4 is performed;
s4: the upper computer 1 opens the impulse voltage generator 4 through the impulse voltage generator controller 2, outputs impulse voltage to the phase A line 41, adjusts the impulse voltage according to the state of the phase A insulator string 15 of the first base tower, and performs an impulse tolerance experiment; the current sensor 54 collects an impact current I on the coaxial cable 5 and transmits the impact current I to the upper computer 1;
s5: upper computer 1 calculates line overshoot tolerance characteristic primary judging factor k1；
S6: the upper computer 1 calculates a line impact tolerance characteristic comprehensive evaluation factor k;
s7: the upper computer 1 evaluates the line impact tolerance characteristics according to the line impact tolerance characteristic comprehensive evaluation factor k in S6.
The specific steps of S4 are as follows:
s4.1: the upper computer 1 turns on the impulse voltage generator 4 through the impulse voltage generation controller 2, and the impulse voltage generator 4 outputs impulse voltage to the phase A line 41 through the coaxial cable 5; meanwhile, the high-voltage probe 51 collects voltages at two ends of the first base tower A-phase insulator string 15 and transmits the voltages to the upper computer 1 through the data collector 3, and the upper computer judges whether flashover occurs to the first base tower A-phase insulator string 15 or not;
S4.2: if the A-phase insulator string 15 of the first base tower does not have flashover, the upper computer 1 raises the impulse voltage output by the impulse voltage generator 4 through the impulse voltage generation controller 2 until the A-phase insulator string 15 of the first base tower happens to have flashover;
if the A-phase insulator string 15 of the first base tower has flashover, the upper computer 1 reduces the impulse voltage output by the impulse voltage generator 4 through the impulse voltage generation controller 2 until the A-phase insulator string 15 of the first base tower just does not flashover;
s4.3: the impact current I of the coaxial cable 5 at this time, which is collected by the current sensor 54, is transmitted to the upper computer 1 through the data collector 3.
The line overshoot tolerance characteristic primary evaluation factor k in S51Calculated by the following formula:
wherein α represents a protection angle,/cRepresents the horizontal distance, l, of the A-phase line 41 from the tower axisgcRepresents the horizontal distance, h, of the first lightning conductor 31 from the phase a line 41gcDenotes the vertical distance, h, of the first lightning conductor 31 from the phase a line 41cThe height of the A-phase line 41 from the ground is represented, n represents the number of insulator pieces of the first base tower A-phase insulator string 15, S represents the equivalent salt density of the insulator of the first base tower A-phase insulator string 15, I represents impact current, and gamma represents the conductivity of the high-conductivity solution. In this embodiment, the protection angle α is 10 °, and the number of insulator pieces is 7.
The line impact resistance characteristic comprehensive evaluation factor k in S6 is calculated by the following formula:
wherein, P1Represents a benchmark evaluation factor one, P2Represents a benchmark evaluation factor two, lcRepresents the horizontal distance, h, of the A-phase line 41 from the axis of the towercThe height of a phase A line 41 from the ground is represented, n represents the number of insulator pieces of a phase A insulator string 15 of a first base tower, S represents the equivalent salt density of the insulator of the phase A insulator string 15 of the first base tower, I represents impact current, gamma represents the conductivity of a high-conductivity solution, and k represents the conductivity of the high-conductivity solution1And a first-level judgment factor representing the overshoot tolerance characteristic of the line. In this embodiment, the number of insulator pieces is 7, and the criterion evaluation factor is P10.00243, benchmark evaluation factor two P2Is 0.84.
In S7, the evaluating method specifically includes:
when k belongs to (0, 1), the line impact resistance is weaker;
when k ∈ (1, + ∞), the line surge withstand characteristic is strong, and the line surge withstand characteristic is strong as the k value is larger.
The method further comprises the steps of:
s8: after the evaluation is finished, the upper computer 1 controls the dehumidifying and air-extracting device 67 to evacuate the high-conductivity fog in the test chamber 60 through the high-conductivity fog control device 61.
The method further comprises the steps of:
s9: after the high conductivity mist in the test chamber 60 is evacuated, the high conductivity solution 64 with different conductivity is replaced, and the steps S1-S8 are repeated to perform the line impact resistance characteristic test under the influence of the high conductivity mist.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A high conductivity, under fog line impact resistance property test platform, the test platform comprising: the device comprises an upper computer (1), an impulse voltage generation controller (2), a data acquisition unit (3), an impulse voltage generator (4), a coaxial cable (5), a high-voltage probe (51), a current sensor (54), a first base tower (8), a second base tower (9), a first lightning conductor (31), an A-phase line (41), a first base tower A-phase insulator string (15), a test box (60), a high-conductivity fog control device (61), an ultrasonic fog generation device (62), a first conductivity meter (63), a high-conductivity solution (64), a pipeline (73), a condensing device (65) and a second conductivity meter (66);
The first base tower (8), the second base tower (9) and the condensing device (65) are arranged in the test box (60), and the ultrasonic fog generating device (62) is arranged on the surface of the test box (60);
the ultrasonic fog generating device (62) is connected with the high-conductivity fog control device (61), and the high-conductivity solution (64) is converted into high-conductivity fog through a pipeline (73) and sprayed into the test box (60) under the control of the high-conductivity fog control device (61);
the first conductivity meter (63) is connected with the high-conductivity fog control device (61), and the first conductivity meter (63) is used for measuring the conductivity of the high-conductivity solution (64) and transmitting the conductivity of the high-conductivity solution (64) to the high-conductivity fog control device (61);
the condensing device (65) is used for receiving the liquefied fog in the test chamber (60) and is connected with the high-conductivity fog control device (61) through a second conductivity meter (66); a second conductivity meter (66) for measuring the conductivity of the liquefied mist and transferring the liquefied mist conductivity to the high conductivity mist control means (61);
the high-conductivity fog control device (61) is also connected with the upper computer (1), receives an instruction of the upper computer (1), and transmits the solution conductivity and the liquefied fog conductivity to the upper computer (1);
the two ends of the first lightning conductor (31) and the A-phase line (41) are respectively connected with a first base tower (8) and a second base tower (9);
The output end of the impulse voltage generator (4) is connected to an A-phase line (41) through a coaxial cable (5), the control end of the impulse voltage generator is connected with the upper computer (1) through the impulse voltage generation controller (2), and the upper computer (1) changes the output voltage of the impulse voltage generator (4) through controlling the impulse voltage generation controller (2);
the high-voltage probe (51) is connected with two ends of the A-phase insulator string (15) of the first base tower and is connected with the upper computer (1) through the data acquisition unit (3);
the current sensor (54) is sleeved on the coaxial cable (5) and is connected with the upper computer (1) through the data acquisition unit (3).
2. The high conductivity line under fog impact resistance test platform of claim 1, further comprising a moisture reducing extraction device (67); the dehumidifying and air-extracting device (67) is connected with the high-conductivity fog control device (61), and air extraction and dehumidification are carried out on the test box (60) under the control of the high-conductivity fog control device (61).
3. The high-conductivity fog line impact resistance characteristic test platform as claimed in claim 2, wherein the model number of the first base tower A-phase insulator string (15) is XP-70.
4. A method for evaluating impact resistance characteristics of a high-conductivity line under fog, the method comprising the steps of:
S1: the ultrasonic fog generating device (62) converts the high-conductivity solution (64) into high-conductivity fog to be sprayed into the test box (60), the first conductivity meter (63) measures the conductivity gamma of the high-conductivity solution (64), and the gamma is sent to the upper computer (1) through the high-conductivity fog control device (61);
s2: the second conductivity meter (66) measures the conductivity gamma of the liquefied fog received by the condensing device (65) in real time1And gamma is1Sending the mist to an upper computer (1) through a high-conductivity mist control device (61);
s3: the upper computer (1) receives gamma and gamma1Making a judgment when gamma is1When γ is reached, step S4 is performed;
s4: the upper computer (1) opens the impulse voltage generator (4) through the impulse voltage generation controller (2), outputs impulse voltage to the A-phase line (41), adjusts the impulse voltage according to the state of the A-phase insulator string (15) of the first base tower, and performs an impulse tolerance experiment; the current sensor (54) collects the impact current I on the coaxial cable (5) and transmits the impact current I to the upper computer (1);
s5: the upper computer (1) calculates a line overshoot tolerance characteristic primary judgment factor k1；
S6: the upper computer (1) calculates a line impact tolerance characteristic comprehensive evaluation factor k;
s7: and the upper computer (1) evaluates the line impact tolerance characteristic according to the line impact tolerance characteristic comprehensive evaluation factor k in S6.
5. The method for evaluating the impact resistance of the high-conductivity fog line according to claim 4, wherein the step S4 comprises the following steps:
s4.1: the upper computer (1) turns on the impulse voltage generator (4) through the impulse voltage generation controller (2), and the impulse voltage generator (4) outputs impulse voltage to the A-phase line (41) through the coaxial cable (5); meanwhile, the high-voltage probe (51) collects voltages at two ends of the A-phase insulator string (15) of the first base tower and transmits the voltages to the upper computer (1) through the data collector (3), and the upper computer judges whether flashover occurs to the A-phase insulator string (15) of the first base tower or not;
s4.2: if the A-phase insulator string (15) of the first base tower does not have flashover, the upper computer (1) raises the impulse voltage output by the impulse voltage generator (4) through the impulse voltage generation controller (2) until the A-phase insulator string (15) of the first base tower just has flashover;
if the A-phase insulator string (15) of the first base tower is in flashover, the upper computer (1) reduces the impulse voltage output by the impulse voltage generator (4) through the impulse voltage generation controller (2) until the A-phase insulator string (15) of the first base tower is just not in flashover;
s4.3: the impact current I of the coaxial cable (5) collected by the current sensor (54) at the moment is transmitted to the upper computer (1) through the data collector (3).
6. The method as claimed in claim 5, wherein the line overshoot tolerance characteristic first-order evaluation factor k in S5 is obtained1Calculated by the following formula:
wherein α represents a protection angle,/cRepresents the horizontal distance l of the A-phase line (41) from the axis of the towergcRepresents the horizontal distance h between the first lightning conductor (31) and the A-phase line (41)gcRepresents the vertical distance h between the first lightning conductor (31) and the A-phase line (41)cThe height of a phase A line (41) from the ground is represented, n represents the number of insulator pieces of a phase A insulator string (15) of the first base tower, S represents the equivalent salt density of the insulators of the phase A insulator string (15) of the first base tower, I represents impact current, and gamma represents the conductivity of the high-conductivity solution.
7. The method for evaluating the impact resistance of the line under the high-conductivity fog according to claim 6, wherein the comprehensive evaluation factor k of the impact resistance of the line in S6 is calculated by the following formula:
wherein, P1Represents a benchmark evaluation factor one, P2Represents a benchmark evaluation factor two, lcRepresents the horizontal distance h of the A-phase line (41) from the axis of the towercThe height of a phase A line (41) from the ground is represented, n represents the number of insulator pieces of a phase A insulator string (15) of a first base tower, S represents the equivalent salt density of the insulator of the phase A insulator string (15) of the first base tower, I represents impact current, gamma represents the conductivity of a high-conductivity solution, k represents 1And a first-level judgment factor representing the overshoot tolerance characteristic of the line.
8. The method for evaluating the impact resistance characteristics of the high-conductivity foggy line according to claim 7, wherein in the step S7, the evaluation method is specifically as follows:
when k belongs to (0, 1), the line impact resistance is weaker;
when k ∈ (1, + ∞), the line surge withstand characteristic is strong, and the line surge withstand characteristic is strong as the k value is larger.
9. The method of claim 8, further comprising the steps of:
s8: after the evaluation is finished, the upper computer (1) controls the dehumidifying and air-extracting device (67) to evacuate the high-conductivity fog in the test box (60) through the high-conductivity fog control device (61).
10. The method of claim 9, further comprising the steps of:
s9: after the high conductivity mist in the test chamber (60) is evacuated, the high conductivity solution (64) with different conductivity is replaced, and the steps S1-S8 are repeated to perform the line impact resistance characteristic test under the influence of the high conductivity mist.
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