CN112526302A - Line overshoot tolerance characteristic test platform and evaluation method under multi-environment factors - Google Patents
Line overshoot tolerance characteristic test platform and evaluation method under multi-environment factors Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a circuit overshoot tolerance characteristic test platform under multiple environmental factors, which 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 circuit, an A-phase insulator string of the first base tower, a test box, a temperature and humidity analysis and control device, a temperature and humidity adjusting device, a temperature and humidity sensor and a gas pressure sensor, wherein the test platform performs an impulse tolerance experiment on the circuit to obtain experiment data; the invention also provides a line overshoot tolerance characteristic evaluation method under multi-environment factors, and the evaluation method evaluates the line overshoot tolerance characteristic comprehensive evaluation factors calculated according to experimental data. The invention considers the influence of the combined action of temperature and humidity on the line overshoot tolerance characteristic, 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 overshoot tolerance characteristic evaluation, in particular to a line overshoot tolerance characteristic test platform and an evaluation method under multiple environmental factors.
Background
The transmission line is subjected to over-high impulse voltage, so that the flashover of a transmission line conducting wire or an insulator can be caused, accidents such as tripping of the transmission line can be caused, and the running stability and safety of a power system can be reduced. Because transmission line erects the scope extensively, and the environment along the line changes variously, and transmission line's overshoot tolerance characteristic can receive the influence of multiple factor in the environment, and wherein the humiture is exactly the important factor that influences transmission line overshoot tolerance characteristic, and the temperature can influence the motion condition of free electron in the environment, and the number of free electron in the environment can be influenced to humidity. The research on the influence of temperature and humidity change in the environment on the overshoot tolerance characteristic of the power transmission line has great significance for improving the overshoot tolerance characteristic of the power transmission line in different external environments and ensuring safe and stable operation of the power transmission network in any environment.
At present, the overshoot tolerance characteristics of the power transmission line are researched domestically, the influence process of temperature and humidity or environmental factors on the overshoot tolerance characteristics of the power transmission line is ignored or only qualitative description is made on the influence of the temperature and humidity, and the overshoot tolerance characteristics of the power transmission line under the influence of the environmental factors are not accurately researched. In order to accurately analyze overshoot tolerance characteristics of a power transmission line under different environmental factors, a method for evaluating overshoot tolerance characteristics of the power transmission line under multiple environmental factors is urgently needed, the influence of complex environmental factors can be considered, and power transmission line overshoot tolerance characteristics can be tested, analyzed and evaluated under different temperatures and humidity.
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 region 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 the combined action of temperature and humidity on the overshoot tolerance characteristics of the power transmission line is not researched.
Disclosure of Invention
The invention provides a line overshoot tolerance characteristic test platform and an evaluation method under multiple environmental factors, aiming at overcoming the defect that the prior art does not relate to overshoot tolerance characteristics of a power transmission line under the combined action of temperature and humidity.
The technical scheme of the invention is as follows:
the invention provides a circuit overshoot tolerance characteristic test platform under multiple environmental factors, 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 temperature and humidity analysis control device, a temperature and humidity adjusting device, a temperature and humidity sensor and a gas pressure sensor;
the first base tower, the second base tower, the temperature and humidity sensor and the air pressure sensor are arranged in the test box, and the temperature and humidity adjusting device is arranged on the surface of the test box;
the temperature and humidity adjusting device is connected with the temperature and humidity analysis control device and is used for adjusting the temperature and the humidity in the test box under the control of the temperature and humidity analysis control device;
the temperature and humidity sensor is connected with the temperature and humidity analysis control device, collects temperature data and humidity data in the test chamber, and transmits the temperature data and the humidity data to the temperature and humidity analysis control device;
the temperature and humidity analysis control device is also connected with the upper computer, receives an instruction of the upper computer and transmits temperature data and humidity data 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;
the air pressure sensor is connected with an upper computer through a data acquisition unit.
Preferably, the model number of the A-phase insulator string of the first base tower is XP-70.
Preferably, the number of the temperature and humidity sensors is at least 2.
The invention also provides a line overshoot tolerance characteristic evaluation method under multi-environment factors, based on the established test platform, the method comprises the following steps:
s1: upper computer setting experiment temperature T0And experimental humidity h0；
S2: the upper computer controls the temperature and humidity adjusting device to adjust the temperature and humidity in the test chamber through the temperature and humidity analysis control device;
s3: the temperature and humidity sensor collects temperature data and humidity data in the test box in real time and transmits the temperature data and the humidity data to the upper computer through the temperature and humidity analysis control device;
s4: when the temperature data collected by the temperature and humidity sensor reaches the experimental temperature T0The humidity data reaches the experimental humidity h0If yes, go to step S5;
s5: 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; the air pressure value p in the air pressure sensor acquisition test box is transmitted to an upper computer through a data acquisition unit;
s6: calculating a line overshoot tolerance characteristic primary judging factor k by an upper computer1And a secondary evaluation factor k2；
S7: the upper computer calculates a comprehensive evaluation factor k of the overshoot tolerance characteristic of the line;
s8: and the upper computer evaluates the line overshoot tolerance characteristic according to the line overshoot tolerance characteristic comprehensive evaluation factor k in the S7.
Preferably, the specific steps of S5 are:
s5.1: 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;
s5.2: 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;
s5.3: the impact current I of the coaxial cable collected by the current sensor at the moment, the air pressure value p in the test box collected by the air pressure sensor at the moment, and the impact current I and the air pressure value p are transmitted to the upper computer through the data collector.
Preferably, the line overshoot tolerance characteristic primary evaluation factor k in S61Calculated 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 A phase line ground clearance is shown, and I the surge current is shown.
Preferably, the line overshoot tolerance characteristic secondary evaluation factor k in S62Calculated by the following formula:
wherein, T0Denotes the experimental temperature, h0The experimental humidity is represented, l represents the length of the phase A insulator string of the first base tower, and p represents the air pressure value in the test chamber.
Preferably, the comprehensive evaluation factor k for the overshoot tolerance characteristic in S7 is calculated by the following formula:
wherein, P1Represents a first benchmark evaluation factor, P2Represents a second benchmark evaluation factor, k1First-level evaluation factor k representing overshoot tolerance characteristic of line2And a secondary evaluation factor of the overshoot tolerance characteristic of the line is represented.
Preferably, in S8, the evaluating method specifically includes:
when k belongs to (0, 1), the overshoot tolerance characteristic of the line is weak;
k ∈ (1, + ∞), the line overshoot tolerance characteristics are stronger, and the larger the k value is, the stronger the line overshoot tolerance characteristics are.
Preferably, the method further comprises the steps of:
s9: and changing the test temperature and/or the test humidity through the upper computer, repeating the steps S1-S8, and performing the line overshoot tolerance characteristic test under different temperature and humidity environments.
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 overshoot tolerance characteristics of a line under multiple environmental factors, aiming at areas with large temperature and/or humidity changes, wherein the overshoot tolerance experiment is carried out on the line based on the test platform, and the evaluation method carries out evaluation according to comprehensive evaluation factors of the overshoot tolerance characteristics of the line calculated by experiment data; the invention considers the influence of the combined action of temperature and humidity on the line overshoot tolerance characteristic, and provides important guarantee for improving the safe and stable operation of the line.
Drawings
FIG. 1 is a block diagram of a circuit overshoot tolerance testing platform under multiple environmental factors as described in example 1; in the figure, 1-an upper computer, 2-an impulse voltage generation controller, 3-a data acquisition device, 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 temperature and humidity analysis control device, 62-a temperature and humidity adjusting device, 63-a temperature and humidity sensor and 65-a pressure sensor.
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 embodiment provides a testing platform for testing the overshoot tolerance characteristics of a circuit under multiple environmental factors, as shown in fig. 1, the testing 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 temperature and humidity analysis control device 61, a temperature and humidity adjusting device 62, a temperature and humidity sensor 63 and a gas pressure sensor 65;
the first base tower 8, the second base tower 9, the temperature and humidity sensor 63 and the air pressure sensor 65 are arranged in the test box 60, and the temperature and humidity adjusting device 62 is arranged on the surface of the test box 60;
the temperature and humidity adjusting device 62 is connected with the temperature and humidity analysis control device 61, and adjusts the temperature and humidity in the test box 60 under the control of the temperature and humidity analysis control device 61;
the temperature and humidity sensor 63 is connected with the temperature and humidity analysis control device 61, collects temperature data and humidity data in the test box 60, and transmits the temperature data and the humidity data to the temperature and humidity analysis control device 61;
the temperature and humidity analysis control device 61 is also connected with the upper computer 1, receives an instruction of the upper computer 1, and transmits temperature data and humidity data to the upper computer 1;
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 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 acquisition unit 3;
the air pressure sensor 65 is connected with the upper computer 1 through the data acquisition unit 3.
The model of the A-phase insulator string 15 of the first base tower is XP-70.
The number of the temperature and humidity sensors 63 is at least 2. In this embodiment, the number of the temperature and humidity sensors 63 is 3
Example 2
The embodiment provides a method for evaluating overshoot tolerance characteristics of a line under multiple environmental factors, which comprises the following steps:
s1: the upper computer 1 sets an experimental temperature T0And experimental humidity h0；
S2: the upper computer 1 controls a temperature and humidity adjusting device 62 to adjust the temperature and the humidity in the test box 60 through a temperature and humidity analysis control device 61;
s3: the temperature and humidity sensor 63 collects temperature data and humidity data in the test box 60 in real time and transmits the temperature data and the humidity data to the upper computer 1 through the temperature and humidity analysis control device 61;
s4: when the temperature data collected by the temperature and humidity sensor 63 reaches the experimental temperature T0The humidity data reaches the experimental humidity h0If yes, go to step S5;
s5: 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; the air pressure sensor 65 collects the air pressure value p in the test box 60 and transmits the air pressure value p to the upper computer 1 through the data collector 3;
s6: upper computer 1 calculates line overshoot tolerance characteristic primary judging factor k1And a secondary evaluation factor k2；
S7: the upper computer 1 calculates a comprehensive evaluation factor k of the overshoot tolerance characteristic of the line;
s8: the upper computer 1 evaluates the line overshoot tolerance characteristics according to the line overshoot tolerance characteristic comprehensive evaluation factor k in S7.
The specific steps of S5 are as follows:
s5.1: 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;
s5.2: 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;
s5.3: the current sensor 54 collects the impact current I of the coaxial cable 5 at this time, and the air pressure sensor 65 collects the air pressure value p in the test box 60 at this time, and transmits the impact current I and the air pressure value p to the upper computer 1 through the data collector 3.
The line overshoot tolerance characteristic primary evaluation factor k in S61Calculated 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 indicated, and I indicates the inrush current. In the present embodiment, the protection angle α is 10 °.
The S6Secondary evaluation factor k for overshoot tolerance characteristic of middle line2Calculated by the following formula:
wherein, T0Denotes the experimental temperature, h0The experimental humidity is shown, l represents the length of the first base tower A-phase insulator string 15, and p represents the air pressure value in the test chamber 60.
The comprehensive evaluation factor k of the overshoot tolerance characteristics in S7 is calculated by the following formula:
wherein, P1Represents a first benchmark evaluation factor, P2Represents a second benchmark evaluation factor, k1First-level evaluation factor k representing overshoot tolerance characteristic of line2And a secondary evaluation factor of the overshoot tolerance characteristic of the line is represented. In the present embodiment, the criterion evaluation factor P10.00243, benchmark evaluation factor two P2Is 0.84.
In S8, the evaluating method specifically includes:
when k belongs to (0, 1), the overshoot tolerance characteristic of the line is weak;
k ∈ (1, + ∞), the line overshoot tolerance characteristics are stronger, and the larger the k value is, the stronger the line overshoot tolerance characteristics are.
The method further comprises the steps of:
s9: and changing the test temperature and/or the test humidity through the upper computer 1, repeating the steps S1-S8, and performing the line overshoot tolerance characteristic test under different temperature and humidity environments.
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 circuit overshoot tolerance characteristic test platform under multiple environmental factors, 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 temperature and humidity analysis control device (61), a temperature and humidity adjusting device (62), a temperature and humidity sensor (63) and an air pressure sensor (65);
the first base tower (8), the second base tower (9), the temperature and humidity sensor (63) and the air pressure sensor (65) are arranged in the test box (60), and the temperature and humidity adjusting device (62) is arranged on the surface of the test box (60);
the temperature and humidity adjusting device (62) is connected with the temperature and humidity analysis control device (61), and the temperature and the humidity in the test box (60) are adjusted under the control of the temperature and humidity analysis control device (61);
the temperature and humidity sensor (63) is connected with the temperature and humidity analysis control device (61), collects temperature data and humidity data in the test box (60), and transmits the temperature data and the humidity data to the temperature and humidity analysis control device (61);
the temperature and humidity analysis control device (61) is also connected with the upper computer (1), receives an instruction of the upper computer (1), and transmits temperature data and humidity data 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);
the air pressure sensor (65) is connected with the upper computer (1) through the data acquisition unit (3).
2. The platform for testing the line overshoot tolerance characteristics under multiple environmental factors according to claim 1, wherein the model number of the first base tower A-phase insulator string (15) is XP-70.
3. The platform for testing the line overshoot tolerance characteristics under multiple environmental factors according to claim 2, wherein the number of the temperature and humidity sensors (63) is at least 2.
4. A method for evaluating overshoot tolerance characteristics of a line under multiple environmental factors is characterized by comprising the following steps:
s1: the upper computer (1) sets the experimental temperature T0And experimental humidity h0；
S2: the upper computer (1) controls a temperature and humidity adjusting device (62) to adjust the temperature and the humidity in the test box (60) through a temperature and humidity analysis control device (61);
s3: the temperature and humidity sensor (63) collects temperature data and humidity data in the test box (60) in real time and transmits the temperature data and the humidity data to the upper computer (1) through the temperature and humidity analysis control device (61);
s4: when the temperature data collected by the temperature and humidity sensor (63) reaches the experimental temperature T0The humidity data reaches the experimental humidity h0If yes, go to step S5;
s5: 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); an air pressure value p in the air pressure sensor (65) acquisition test box (60) is transmitted to an upper computer (1) through a data acquisition unit (3);
s6: the upper computer (1) calculates a line overshoot tolerance characteristic primary judgment factor k1And a secondary evaluation factor k2；
S7: the upper computer (1) calculates a line overshoot tolerance characteristic comprehensive judgment factor k;
s8: and the upper computer (1) evaluates the line overshoot tolerance characteristic according to the line overshoot tolerance characteristic comprehensive evaluation factor k in S7.
5. The method as claimed in claim 4, wherein the step of S5 is as follows:
s5.1: 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;
s5.2: 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;
s5.3: the current sensor (54) collects the impact current I of the coaxial cable (5) at the moment, the air pressure sensor (65) collects the air pressure value p in the test box (60) at the moment, and the impact current I and the air pressure value p are 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 evaluation method in S6 is characterized in that the line overshoot tolerance characteristic primary evaluation factor k is1Calculated 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 the A-phase line (41) from the ground is shown, and I represents the surge current.
7. The method as claimed in claim 6, wherein the second-level evaluation factor k in S6 is used to evaluate overshoot tolerance characteristics of the line under multiple environmental factors2Calculated by the following formula:
wherein, T0Denotes the experimental temperature, h0The experimental humidity is represented, l represents the length of the phase A insulator string (15) of the first base tower, and p represents the air pressure value in the test box (60).
8. The method as claimed in claim 7, wherein the comprehensive evaluation factor k of overshoot tolerance characteristics in S7 is calculated by the following formula:
wherein, P1Represents a first benchmark evaluation factor, P2Represents a second benchmark evaluation factor, k1First-level evaluation factor k representing overshoot tolerance characteristic of line2And a secondary evaluation factor of the overshoot tolerance characteristic of the line is represented.
9. The method for evaluating the overshoot tolerance characteristics of the line under multiple environmental factors according to claim 8, wherein in S8, the evaluating method specifically comprises:
when k belongs to (0, 1), the overshoot tolerance characteristic of the line is weak;
k ∈ (1, + ∞), the line overshoot tolerance characteristics are stronger, and the larger the k value is, the stronger the line overshoot tolerance characteristics are.
10. The method as claimed in claim 9, wherein the method further comprises the following steps:
s9: and changing the test temperature and/or the test humidity through the upper computer (1), repeating the steps S1-S8, and performing the line overshoot tolerance characteristic test under different temperature and humidity environments.
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| CN114778956A (en) * | 2022-04-20 | 2022-07-22 | 广东海洋大学 | Seaside transformer substation casing insulation performance evaluation method considering salt water influence factors |
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| CN114778972A (en) * | 2022-04-12 | 2022-07-22 | 广东海洋大学 | Aging evaluation method for offshore substation sleeve considering ocean current factors |
| CN114778956A (en) * | 2022-04-20 | 2022-07-22 | 广东海洋大学 | Seaside transformer substation casing insulation performance evaluation method considering salt water influence factors |
| CN114778956B (en) * | 2022-04-20 | 2024-07-05 | 广东海洋大学 | Marine substation sleeve insulation performance evaluation method considering saline water influence factors |
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