CN110865270A - 220kV power transmission line counterattack trip-out rate test method under lightning stroke - Google Patents
220kV power transmission line counterattack trip-out rate test method under lightning stroke Download PDFInfo
- Publication number
- CN110865270A CN110865270A CN201911223232.2A CN201911223232A CN110865270A CN 110865270 A CN110865270 A CN 110865270A CN 201911223232 A CN201911223232 A CN 201911223232A CN 110865270 A CN110865270 A CN 110865270A
- Authority
- CN
- China
- Prior art keywords
- lightning
- insulator string
- tower
- phase
- transmission line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G01R31/003—Environmental or reliability tests
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/004—Artificial life, i.e. computing arrangements simulating life
- G06N3/006—Artificial life, i.e. computing arrangements simulating life based on simulated virtual individual or collective life forms, e.g. social simulations or particle swarm optimisation [PSO]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Biophysics (AREA)
- Computational Linguistics (AREA)
- Data Mining & Analysis (AREA)
- Evolutionary Computation (AREA)
- Artificial Intelligence (AREA)
- Molecular Biology (AREA)
- Computing Systems (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mathematical Physics (AREA)
- Software Systems (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Insulators (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a method for testing counterattack tripping rate of a 220kV power transmission line under lightning stroke, which is characterized in that a testing device is set up, the device comprises an impulse voltage generator, a data measurement analysis control module, a wireless current sensor, a coaxial cable, a first base tower, a second base tower, a third base tower, a first lightning conductor, a second lightning conductor, an A-phase line, a B-phase line and a C-phase line, the lightning resistance level theoretical calculation formula of the power transmission line is optimized by utilizing a particle swarm optimization based on an actual test result, and finally the counterattack tripping rate is calculated based on an optimized result. The method has the advantages that the method for testing the counterattack tripping rate of the 220kV power transmission line under the lightning stroke is provided, the testing device is established, and a solid research foundation is provided for the lightning protection design and the lightning protection method of the power transmission line.
Description
Technical Field
The invention relates to the technical field of lightning protection, in particular to a method for testing the counterattack trip-out rate of a 220kV power transmission line under lightning stroke.
Background
With the rapid development of the scale of a power grid and frequent occurrence of severe weather, accidents caused by lightning striking of a power transmission line are increasing. When thunder and lightning strikes a line tower or an overhead ground wire directly, lightning current flows to the ground through the tower and the grounding device thereof, the tower and the grounding device thereof have certain impedance, the voltage drop generated by the lightning current on the impedance raises the potential of the tower top, when the potential of the tower top is raised to a certain value, flashover can occur between the tower and a lead, and the lead forms power frequency follow current on the tower through a flashover channel, thereby leading to line tripping. In order to accurately evaluate the counterattack tripping rate of the lightning direct attack 220kV power transmission line, an intelligent test platform and an intelligent test method are urgently needed.
Disclosure of Invention
The invention aims to provide a method for testing the counterattack trip-out rate of a 220kV power transmission line under lightning stroke, which comprises a relatively accurate device for testing the counterattack trip-out rate of the 220kV power transmission line under the lightning stroke.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a220 kV power transmission line counterattack trip-out rate test method under lightning stroke is characterized in that a 220kV power transmission line counterattack trip-out rate test device under lightning stroke is established, and the device comprises an impulse voltage generator, a data measurement analysis control module, a wireless current sensor, a coaxial cable, a first base tower, a second base tower, a third base tower, a lightning conductor I, a lightning conductor II, an A-phase line, a B-phase line and a C-phase line;
the output end of the impulse voltage generator is connected to the tower top of the first base tower through a coaxial cable, and the wireless current sensor is sleeved on the coaxial cable;
the first lightning conductor and the second lightning conductor are respectively connected with the first base tower, the second base tower and the third base tower in series;
further, the first base tower comprises a first tower main body, a first A-phase insulator string, a first B-phase insulator string, a first C-phase insulator string, a first grounding down lead, a first grounding device and a sand pool; two ends of the A-phase insulator string are respectively connected with the first tower main body and the A-phase line, two ends of the B-phase insulator string are respectively connected with the first tower main body and the B-phase line, and two ends of the C-phase insulator string are respectively connected with the first tower main body and the C-phase line; the bottom of the tower main body is connected to a first grounding device through a grounding downlead, the first grounding device is buried in a sand pool, and soil is filled in the sand pool;
further, the second base tower comprises a second tower main body, a second A-phase insulator string, a second B-phase insulator string, a second C-phase insulator string, a second grounding down lead and a second grounding device; two ends of the A-phase insulator string are respectively connected with the second tower main body and the A-phase line, two ends of the B-phase insulator string are respectively connected with the second tower main body and the B-phase line, and two ends of the C-phase insulator string are respectively connected with the second tower main body and the C-phase line; the bottom of the tower main body II is connected to a grounding device II through a grounding down lead II;
further, the third base tower comprises a third tower main body, a third A-phase insulator string, a third B-phase insulator string, a third C-phase insulator string, a third grounding down lead and a third grounding device; the two ends of the A-phase insulator string are respectively connected with the third tower main body and the line A, the two ends of the B-phase insulator string are respectively connected with the third tower main body and the line B, and the two ends of the C-phase insulator string are respectively connected with the third tower main body and the line C; the bottom of the tower main body III is connected to a grounding device III through a grounding down lead III;
furthermore, the data measurement analysis control module comprises a first high-voltage differential probe, a second high-voltage differential probe, a third high-voltage differential probe, a data acquisition unit, a wireless receiving module, an upper computer and a signal controller; the high-voltage differential probe I, the high-voltage differential probe II and the high-voltage differential probe III are respectively connected to two ends of the A-phase insulator string I, the B-phase insulator string I and the C-phase insulator string I and are connected to an upper computer through a data acquisition unit; the wireless receiving module transmits the current collected by the wireless current sensor to an upper computer; the upper computer changes the output voltage of the impulse voltage generator through the control signal controller.
A220 kV transmission line counterattack trip-out rate test method under lightning stroke is based on an established test device and comprises the following test steps:
s1: simulating lightning stroke on the tower top of the transmission line tower, and carrying out lightning resistance horizontal test;
s2: changing the soil resistivity of the soil in the sand pool aiming at the low soil resistivity area, starting from 10 omega m, taking one soil resistivity every 10 omega m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity;
s3: calculating the lightning resistance level theoretical value I under different soil resistivities according to the following formula:
wherein L is the total length of the conductor of the grounding device, h is the buried depth of the grounding device, d is the diameter of the conductor of the grounding device, B is the form factor, L is the geometric dimension, and L is the total length of the conductor of the grounding devicegtIs the equivalent inductance of the tower, hdIs the average height, U, of the power conductors50％The flashover voltage of an insulator string is represented by α, K is a coupling coefficient after corona correction, m is an error coefficient, and η is an integral variable;
s4: performing optimization modeling on a lightning-resistant level theoretical calculation formula by adopting a particle swarm optimization algorithm, and calculating an m value which minimizes the error between a lightning-resistant level measured value and a theoretical value;
s5: for the low soil resistivity region, the optimal value m is obtained by optimizing according to the step S40Substituting the following formula (2) into the optimized theoretical formula:
in the formula (2), IyCalculating a theoretical value for the optimized lightning resistance level;
s6: in the area with medium soil resistivity, changing the soil resistivity of the soil in the sand pool, starting from 150 omega m, taking one soil resistivity at intervals of 50 omega m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity; repeating the fourth step to obtain the optimal value m1And further obtaining a calculation formula of the lightning resistance level of the power transmission line aiming at the area with higher soil rate:
s7: in the high soil resistivity area, changing the soil resistivity of the soil (18) in the sand pool (5), starting from 550 ohm-m, taking one soil resistivity at intervals of 50 ohm-m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity, wherein 20 groups are measured; repeating the fourth step to obtain the optimal value m2And further obtaining a calculation formula of the lightning resistance level of the power transmission line for the ultrahigh soil rate area:
s8: the counterattack trip rate Z is calculated by the following formula:
wherein Z is the counterattack trip rate, M is the number of days of lightning fall per year, IyFor lightning resistance, HbIs the ground clearance h of the junction of the lightning conductor and the towerarcFor lightning conductorSag, D is the spacing between the lightning conductors, G is the striking rod rate, U1Rated voltage for transmission line, LxjIs the insulator string flashover distance.
Further, the specific process of step S1 is:
1) the lightning voltage with the amplitude of U is output to the tower top of the first base tower after the impulse voltage generator is turned on, the lightning current sensor records the lightning current injected into the tower top of the first base tower, and the lightning current is wirelessly transmitted to the wireless receiving module and further transmitted to the upper computer; meanwhile, the first high-voltage differential probe, the second high-voltage differential probe and the third high-voltage differential probe respectively measure overvoltage at two ends of the first A-phase insulator string, the first B-phase insulator string and the first C-phase insulator string, and the overvoltage is transmitted to an upper computer through a data acquisition unit;
2) if the insulator string has flashover, the lightning voltage amplitude output by the impulse voltage generator is reduced by delta U through the signal controller, the impulse voltage generator is turned on again, the method is repeated until the insulator string just does not have flashover, and the lightning current amplitude I measured in the previous time is measuredcAs lightning resistance level; if insulator strings are not in flashover, increasing the lightning voltage amplitude output by the impulse voltage generator by delta U through the signal controller, opening the impulse voltage generator again, repeating the method until one insulator string is found to be in flashover, and measuring the lightning current amplitude I measured at this timecAs lightning resistance level.
Further, the specific process of step S4 is:
1) generating an initial population having uniformly distributed particles and velocities, setting a stopping condition;
2) and calculating an objective function value according to the formula (6):
wherein g (m) represents an objective function, IiFor the ith soil resistanceTheoretical calculation of lightning resistance level in the case of rate, IciThe measured value of the lightning resistance level under the condition of the ith soil resistivity is n, and the number of the measured data sets of the lightning resistance level of the corresponding soil resistivity area is n;
3) updating the individual historical optimal position of each particle and the optimal position of the whole group;
4) updating the speed and position of each particle;
5) if the stopping condition is met, stopping searching and outputting the searching result, otherwise, returning to the step 2);
6) and obtaining the m value which minimizes the error between the actual measured lightning-resistant level and the theoretical value.
Wherein the low soil resistivity region is: ρ < ═ 100 Ω · m; the medium soil resistivity regions are: 100 Ω · m < ρ < ═ 500 Ω · m; the high soil resistivity areas are: 500 Ω · m < ρ < ═ 1000 Ω · m, where ρ is the soil resistivity.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the lightning resistance level of the lightning strike power transmission line under different soil resistivity is accurately tested; the counterattack trip rate formula is corrected by a method combining measurement and theory; main operation and control are completed through an upper computer, operation is convenient and intelligent, safety and reliability are achieved, and universality is achieved for lightning resistance level testing.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention.
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
As shown in fig. 1, a method for testing counterattack tripping rate of a 220kV power transmission line under lightning strike includes firstly establishing a device for testing counterattack tripping rate of a 220kV power transmission line under lightning strike, where the device includes an impulse voltage generator 11, a data measurement analysis control module 17, a wireless current sensor 7, a coaxial cable 24, a first base tower 21, a second base tower 22, a third base tower 23, a first lightning conductor 81, a second lightning conductor 82, an a-phase line 91, a B-phase line 92, and a C-phase line 93;
the output end of the impulse voltage generator 11 is connected to the tower top of the first base tower 21 through a coaxial cable 24, and the wireless current sensor 7 is sleeved on the coaxial cable 24;
the first lightning conductor 81 and the second lightning conductor 82 respectively connect the first base tower 21, the second base tower 22 and the third base tower 23 in series;
the first base tower 21 comprises a tower main body I101, an A-phase insulator string I131, a B-phase insulator string I132, a C-phase insulator string I133, a grounding down lead I161, a grounding device I61 and a sand pool 5; two ends of the first A-phase insulator string 131 are respectively connected with the first tower main body 101 and the first A-phase line 91, two ends of the first B-phase insulator string 132 are respectively connected with the first tower main body 101 and the first B-phase line 92, and two ends of the first C-phase insulator string 133 are respectively connected with the first tower main body 101 and the first C-phase line 93; the bottom of the first tower body 101 is connected to a first grounding device 61 through a first grounding down lead 161, the first grounding device 61 is buried in the sand pool 5, and soil 18 is filled in the sand pool 5;
the second base tower 22 comprises a second tower main body 102, a second A-phase insulator string 141, a second B-phase insulator string 142, a second C-phase insulator string 143, a second grounding down lead 162 and a second grounding device 62; two ends of the A-phase insulator string II 141 are respectively connected with the tower main body II 102 and the A-phase line 91, two ends of the B-phase insulator string II 142 are respectively connected with the tower main body II 102 and the B-phase line 92, and two ends of the C-phase insulator string II 143 are respectively connected with the tower main body II 102 and the C-phase line 93; the bottom of the second tower main body 102 is connected to the second grounding device 62 through a second grounding down lead 162;
the third base tower 23 comprises a tower main body three 103, an A-phase insulator string three 151, a B-phase insulator string three 152, a C-phase insulator string three 153, a grounding down lead three 163 and a grounding device three 63; two ends of the A-phase insulator string III 151 are respectively connected with the tower main body III 103 and the A-phase line 91, two ends of the B-phase insulator string III 152 are respectively connected with the tower main body III 103 and the B-phase line 92, and two ends of the C-phase insulator string III 153 are respectively connected with the tower main body III 103 and the C-phase line 93; the bottom of the tower main body III 103 is connected to a grounding device III 63 through a grounding down lead III 163;
the data measurement analysis control module 17 comprises a first high-voltage differential probe 41, a second high-voltage differential probe 42, a third high-voltage differential probe 43, a data acquisition unit 3, a wireless receiving module 2, an upper computer 1 and a signal controller 12; the high-voltage differential probe I41, the high-voltage differential probe II 42 and the high-voltage differential probe III 43 are respectively connected to two ends of the A-phase insulator string I131, the B-phase insulator string I132 and the C-phase insulator string I133 and are connected to the upper computer 1 through the data acquisition unit 3; the wireless receiving module 2 transmits the current collected by the wireless current sensor 7 to the upper computer 1; the upper computer 1 changes the output voltage of the impulse voltage generator 11 through the control signal controller 12.
Example 2
A220 kV transmission line counterattack trip-out rate test method under lightning stroke is based on the established test transpose and comprises the following steps:
s1: simulating lightning stroke on the tower top of the transmission line tower, and carrying out lightning resistance horizontal test;
s2: for the low soil resistivity region, rho < ═ 100 Ω · m, where rho is the soil resistivity, the soil resistivity of the soil 18 in the sand pool 5 is changed, one soil resistivity is taken every 10 Ω · m from 10 Ω · m, and the step S1 is repeated to measure the lightning withstand level under the soil resistivity;
s3: calculating the lightning resistance level theoretical value I under different soil resistivities according to the following formula:
wherein L is the total length of the conductor of the grounding device, h is the buried depth of the grounding device, d is the diameter of the conductor of the grounding device, B is the form factor, L is the geometric dimension, and L is the total length of the conductor of the grounding devicegtIn the form of poles and towersEquivalent inductance, hdIs the average height, U, of the power conductors50％The flashover voltage of an insulator string is represented by α, K is a coupling coefficient after corona correction, m is an error coefficient, and η is an integral variable;
s4: performing optimization modeling on a lightning-resistant level theoretical calculation formula by adopting a particle swarm optimization algorithm, and calculating an m value which minimizes the error between a lightning-resistant level measured value and a theoretical value;
s5: for the low soil resistivity region, the optimal value m is obtained by optimizing according to the step S40Substituting the following formula (2) into the optimized theoretical formula:
in the formula (2), IyCalculating a theoretical value for the optimized lightning resistance level;
s5: in the region of medium soil resistivity, 100 Ω. m<ρ<Changing the soil resistivity of the soil 18 in the sand pool 5, starting from 150 Ω · m, by taking one soil resistivity every 50 Ω · m, and repeating step S1 to obtain the lightning withstand level at the soil resistivity; repeating the fourth step to obtain the optimal value m1And further obtaining a calculation formula of the lightning resistance level of the power transmission line aiming at the area with higher soil rate:
s6: in high soil resistivity region, 500. omega. m<ρ<Changing the soil resistivity of the soil 18 in the sand pool 5, starting from 550 Ω · m, by taking one soil resistivity at intervals of 50 Ω · m, and repeating step S1 to obtain the lightning withstand level at the soil resistivity, and measuring 20 groups in total; repeating the fourth step to obtain the optimal value m2And further obtaining a calculation formula of the lightning resistance level of the power transmission line for the ultrahigh soil rate area:
s7: the counterattack trip rate Z is calculated by the following formula:
wherein Z is the counterattack trip rate, M is the number of days of lightning fall per year, IyFor lightning resistance, HbIs the ground clearance h of the junction of the lightning conductor and the towerarcFor the sag of the lightning conductor, D is the spacing between the lightning conductors, G is the striking rod rate, U1Rated voltage for transmission line, LxjIs the insulator string flashover distance.
The specific process of step S1 is:
1) the impulse voltage generator 11 is turned on, lightning voltage with the amplitude of U is output to the tower top of the first base tower 21, the lightning current sensor 7 records the lightning current injected into the tower top of the first base tower 21, and the lightning current is wirelessly transmitted to the wireless receiving module 2 and further transmitted to the upper computer 1; meanwhile, the first high-voltage differential probe 41, the second high-voltage differential probe 42 and the third high-voltage differential probe 43 respectively measure overvoltage at two ends of the first A-phase insulator string 131, the first B-phase insulator string 132 and the first C-phase insulator string 133, the overvoltage is transmitted to the upper computer 1 through the data acquisition unit 3, the upper computer 1 controls the signal controller 12 to close the impulse voltage generator 11, and whether flashover occurs in the first A-phase insulator string 131, the first B-phase insulator string 132 and the first C-phase insulator string 133 is judged;
2) if an insulator string is in flashover, the lightning voltage amplitude output by the impulse voltage generator 11 is reduced by delta U through the signal controller 12, the impulse voltage generator 11 is turned on again, the method is repeated until the insulator string is just not in flashover, and the lightning current amplitude I measured at the previous time is measuredcAs lightning resistance level; if insulator strings are not in flashover, the lightning voltage amplitude output by the impulse voltage generator 11 is increased by delta U through the signal controller 12, the impulse voltage generator 11 is turned on again, the method is repeated until one insulator string is found to be in flashover, and the lightning current amplitude I measured at this time is measuredcAs lightning resistance level.
The specific process of step S4 is:
1) generating an initial population having uniformly distributed particles and velocities, setting a stopping condition;
2) and calculating an objective function value according to the formula (12):
wherein g (m) represents an objective function, IiIs a theoretical calculation value of lightning resistance level under the condition of the ith soil resistivity, IciThe measured value of the lightning resistance level under the condition of the ith soil resistivity is n, and the number of the measured data sets of the lightning resistance level of the corresponding soil resistivity area is n;
3) updating the individual historical optimal position of each particle and the optimal position of the whole group;
4) updating the speed and position of each particle;
5) if the stopping condition is met, stopping searching and outputting the searching result, otherwise, returning to the step 2);
6) and obtaining the m value which minimizes the error between the actual measured lightning-resistant level and the theoretical value.
The same or similar reference numerals correspond to the same or similar parts;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present 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 (6)
1. A220 kV power transmission line counterattack trip-out rate test method under lightning strike is characterized by firstly establishing a 220kV power transmission line counterattack trip-out rate test device under the lightning strike, wherein the device comprises an impulse voltage generator (11), a data measurement analysis control module (17), a wireless current sensor (7), a coaxial cable (24), a first base tower (21), a second base tower (22), a third base tower (23), a first lightning conductor (81), a second lightning conductor (82), an A-phase line (91), a B-phase line (92) and a C-phase line (93);
the output end of the impulse voltage generator (11) is connected to the tower top of the first base tower (21) through a coaxial cable (24), and the wireless current sensor (7) is sleeved on the coaxial cable (24);
the first lightning conductor (81) and the second lightning conductor (82) are respectively connected in series with the first base tower (21), the second base tower (22) and the third base tower (23);
the first base tower (21) in the device for testing the counterattack tripping rate of the 220kV power transmission line under lightning stroke comprises a tower main body I (101), an A-phase insulator string I (131), a B-phase insulator string I (132), a C-phase insulator string I (133), a grounding down lead I (161), a grounding device I (61) and a sand pool (5); two ends of a first A-phase insulator string (131) are respectively connected with a first tower main body (101) and an A-phase line (91), two ends of a first B-phase insulator string (132) are respectively connected with the first tower main body (101) and the B-phase line (92), and two ends of a first C-phase insulator string (133) are respectively connected with the first tower main body (101) and the C-phase line (93); the bottom of the tower main body I (101) is connected to a grounding device I (61) through a grounding down lead I (161), the grounding device I (61) is buried in a sand pool (5), and soil (18) is filled in the sand pool (5);
the second base tower (22) in the 220kV transmission line counterattack trip-out rate testing device under lightning stroke comprises a tower main body II (102), an A-phase insulator string II (141), a B-phase insulator string II (142), a C-phase insulator string II (143), a grounding down lead II (162) and a grounding device II (62); two ends of the A-phase insulator string II (141) are respectively connected with the tower main body II (102) and the A-phase line (91), two ends of the B-phase insulator string II (142) are respectively connected with the tower main body II (102) and the B-phase line (92), and two ends of the C-phase insulator string II (143) are respectively connected with the tower main body II (102) and the C-phase line (93); the bottom of the second tower main body (102) is connected to a second grounding device (62) through a second grounding down lead (162);
the third base tower (23) in the device for testing the counterattack trip-out rate of the 220kV power transmission line under lightning stroke comprises a tower main body III (103), an A-phase insulator string III (151), a B-phase insulator string III (152), a C-phase insulator string III (153), a grounding down-lead III (163) and a grounding device III (63); two ends of a third A-phase insulator string (151) are respectively connected with a third tower main body (103) and an A-phase line (91), two ends of a third B-phase insulator string (152) are respectively connected with the third tower main body (103) and a B-phase line (92), and two ends of a third C-phase insulator string (153) are respectively connected with the third tower main body (103) and the C-phase line (93); the bottom of the tower main body III (103) is connected to a grounding device III (63) through a grounding down lead III (163);
the data measurement analysis control module (17) in the 220kV transmission line counterattack tripping rate testing device under lightning stroke comprises a high-voltage differential probe I (41), a high-voltage differential probe II (42), a high-voltage differential probe III (43), a data acquisition unit (3), a wireless receiving module (2), an upper computer (1) and a signal controller (12); the high-voltage differential probe I (41), the high-voltage differential probe II (42) and the high-voltage differential probe III (43) are respectively connected to two ends of the A-phase insulator string I (131), the B-phase insulator string I (132) and the C-phase insulator string I (133) and are connected to the upper computer (1) through the data acquisition unit (3); the wireless receiving module (2) transmits the current collected by the wireless current sensor (7) to the upper computer (1); the upper computer (1) changes the output voltage of the impulse voltage generator (11) through the control signal controller (12).
2. The method for testing the back-strike trip rate of the 220kV power transmission line under the lightning strike according to claim 1, which is characterized by comprising the following steps:
s1: simulating lightning stroke on the tower top of the transmission line tower, and carrying out lightning resistance horizontal test;
s2: for the low soil resistivity area, changing the soil resistivity of the soil (18) in the sand pool (5), starting from 10 omega m, taking one soil resistivity every 10 omega m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity;
s3: calculating the lightning resistance level theoretical value I under different soil resistivities according to the following formula:
wherein L is the total length of the conductor of the grounding device, h is the buried depth of the grounding device, d is the diameter of the conductor of the grounding device, B is the form factor, L is the geometric dimension, and L is the total length of the conductor of the grounding devicegtIs the equivalent inductance of the tower, hdIs the average height, U, of the power conductors50％The flashover voltage of an insulator string is represented by α, K is a coupling coefficient after corona correction, m is an error coefficient, and η is an integral variable;
s4: performing optimization modeling on a lightning-resistant level theoretical calculation formula by adopting a particle swarm optimization algorithm, and calculating an m value which minimizes the error between a lightning-resistant level measured value and a theoretical value;
s5: for the low soil resistivity region, the optimal value m is obtained by optimizing according to the step S40Substituting the following formula (2) into the optimized theoretical formula:
in the formula (2), IyCalculating a theoretical value for the optimized lightning resistance level;
s6: in the area with medium soil resistivity, changing the soil resistivity of the soil (18) in the sand pool (5), starting from 150 omega m, taking one soil resistivity at intervals of 50 omega m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity; repeating the fourth step to obtain the optimal value m1And further obtaining a calculation formula of the lightning resistance level of the power transmission line aiming at the area with higher soil rate:
s7: in the high soil resistivity area, changing the soil resistivity of the soil (18) in the sand pool (5), starting from 550 ohm-m, taking one soil resistivity at intervals of 50 ohm-m, and repeating the step S1 to obtain the lightning resistance level under the soil resistivity, wherein 20 groups are measured; repeating the fourth step to obtain the productOptimum value m2And further obtaining a calculation formula of the lightning resistance level of the power transmission line for the ultrahigh soil rate area:
s8: the counterattack trip rate Z is calculated by the following formula:
wherein Z is the counterattack trip rate, M is the number of days of lightning fall per year, IyFor the theoretical calculation of the optimized lightning resistance level, HbIs the ground clearance h of the junction of the lightning conductor and the towerarcFor the sag of the lightning conductor, D is the spacing between the lightning conductors, G is the striking rod rate, U1Rated voltage for transmission line, LxjIs the insulator string flashover distance.
3. The method for testing the back-strike trip rate of the 220kV power transmission line under the lightning strike according to claim 2, wherein the specific process of the step S1 is as follows:
1) the impulse voltage generator (11) is turned on, lightning voltage with the amplitude of U is output to the tower top of the first base tower (21), the lightning current sensor (7) records the lightning current injected into the tower top of the first base tower (21), and the lightning current is wirelessly transmitted to the wireless receiving module (2) and further transmitted to the upper computer (1); meanwhile, overvoltage at two ends of the A-phase insulator string I (131), the B-phase insulator string I (132) and the C-phase insulator string I (133) is respectively measured by the high-voltage differential probe I (41), the high-voltage differential probe II (42) and the high-voltage differential probe III (43), and is transmitted to the upper computer (1) through the data acquisition unit (3), the upper computer (1) controls the signal controller (12) to close the impact voltage generator (11), and whether flashover occurs in the A-phase insulator string I (131), the B-phase insulator string I (132) and the C-phase insulator string I (133) is judged;
2) if the insulator string has flashover, the signal controller (12) reduces the amplitude of the lightning voltage output by the impulse voltage generator (11) by delta U, and opens the impulse voltage generator (11) again,repeating the method until the insulator string just does not have flashover, and then measuring the lightning current amplitude I measured at the previous timecAs lightning resistance level; if insulator strings are not in flashover, the lightning voltage amplitude output by the impulse voltage generator (11) is increased by delta U through the signal controller (12), the impulse voltage generator (11) is turned on again, the method is repeated until one insulator string is found to be in flashover, and the current amplitude I measured at this time is usedcAs lightning resistance level.
4. The method for testing the back-strike trip rate of the 220kV power transmission line under the lightning strike according to claim 2, wherein the specific process of the step S4 is as follows:
1) generating an initial population having uniformly distributed particles and velocities, setting a stopping condition;
2) and calculating an objective function value according to the formula (2):
wherein g (m) represents an objective function, IiIs a theoretical calculation value of lightning resistance level under the condition of the ith soil resistivity, IciThe measured value of the lightning resistance level under the condition of the ith soil resistivity is n, and the number of the measured data sets of the lightning resistance level of the corresponding soil resistivity area is n;
3) updating the individual historical optimal position of each particle and the optimal position of the whole group;
4) updating the speed and position of each particle;
5) if the stopping condition is met, stopping searching and outputting the searching result, otherwise, returning to the step 2);
6) and obtaining the m value which minimizes the error between the actual measured lightning-resistant level and the theoretical value.
5. The method for testing the back-strike trip rate of the 220kV power transmission line under the lightning strike according to claim 2, wherein in the step S2, the low soil resistivity area is as follows: ρ < ═ 100 Ω · m, where ρ is the soil resistivity.
6. The method for testing the back-strike trip rate of the 220kV power transmission line under the lightning strike according to claim 2, wherein the area with medium soil resistivity is as follows: 100 Ω · m < ρ < ═ 500 Ω · m, and high soil resistivity regions are: 500 Ω · m < ρ < ═ 1000 Ω · m, where ρ is the soil resistivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911223232.2A CN110865270B (en) | 2019-12-03 | 2019-12-03 | 220kV power transmission line counterattack trip-out rate test method under lightning stroke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911223232.2A CN110865270B (en) | 2019-12-03 | 2019-12-03 | 220kV power transmission line counterattack trip-out rate test method under lightning stroke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110865270A true CN110865270A (en) | 2020-03-06 |
| CN110865270B CN110865270B (en) | 2021-07-13 |
Family
ID=69658380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911223232.2A Active CN110865270B (en) | 2019-12-03 | 2019-12-03 | 220kV power transmission line counterattack trip-out rate test method under lightning stroke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110865270B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021109634A1 (en) * | 2019-12-03 | 2021-06-10 | 广东电网有限责任公司 | Lightning trip rate testing method taking soil resistivity variation into account |
| WO2021109630A1 (en) * | 2019-12-03 | 2021-06-10 | 广东电网有限责任公司 | Method for evaluating lightning withstand level of power transmission line in lightning strike in high soil resistivity region |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279334A (en) * | 2011-08-30 | 2011-12-14 | 中国瑞林工程技术有限公司 | Lightning resistance horizontal dynamic monitoring method for electric transmission line poles and towers |
| US20120109545A1 (en) * | 2010-10-29 | 2012-05-03 | Verizon Patent And Licensing Inc. | Remote power outage & restoration notification |
| CN103207340A (en) * | 2013-05-02 | 2013-07-17 | 深圳供电局有限公司 | On-line transmission line lightning shielding failure trip early-warning method |
| WO2013115449A1 (en) * | 2012-01-31 | 2013-08-08 | 주식회사 케이에이치바텍 | Overhead power transmission and distribution line monitoring apparatus for selectively switching communication schemes of low-loss multi-directional antenna |
| US8593151B2 (en) * | 2011-02-28 | 2013-11-26 | Jeffrey M Drazan | Inductive monitoring of a power transmission line of an electrical network |
| CN103474940A (en) * | 2013-09-28 | 2013-12-25 | 成都星河科技产业有限公司 | Comprehensive lightning protection system of electric transmission lines of high tower of power grid |
| CN103646148A (en) * | 2013-12-20 | 2014-03-19 | 国家电网公司 | Simulation method for calculating lightning back-striking performance of UHV transmission lines |
| CN103823101A (en) * | 2014-03-14 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for measuring impact current division coefficient of power transmission line tower with lightning conductor |
| CN204347122U (en) * | 2015-01-07 | 2015-05-20 | 云南电网有限责任公司玉溪供电局 | For reducing the thunderbolt detection system that the transmission line of electricity of tripping rate with lightning strike is transformed |
| CN105137286A (en) * | 2015-09-01 | 2015-12-09 | 国网新疆电力公司经济技术研究院 | Power transmission line lightning stroke monitoring device and lightning protection level assessment method |
| CN205016965U (en) * | 2015-10-26 | 2016-02-03 | 厦门理工学院 | Overhead transmission line lightning protection device and resistant thunder horizontal checkout system thereof |
| CN106918762A (en) * | 2015-12-25 | 2017-07-04 | 中国电力科学研究院 | A kind of overhead transmission line thunderbolt current monitoring method and lightning fault recognition methods |
| CN207623449U (en) * | 2017-11-14 | 2018-07-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC power transmission line lightning stroke trip failure shaft tower quick search device |
| CN109507552A (en) * | 2018-11-29 | 2019-03-22 | 清华大学 | Shaft tower shock wave impedance detection method and device based on tower top back wave |
| CN110361584A (en) * | 2019-08-04 | 2019-10-22 | 西南交通大学 | The risk assessment experiment porch and method of transmission line of lightning strike singlephase earth fault |
| CN110445082A (en) * | 2019-08-20 | 2019-11-12 | 长沙理工大学 | The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line |
-
2019
- 2019-12-03 CN CN201911223232.2A patent/CN110865270B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120109545A1 (en) * | 2010-10-29 | 2012-05-03 | Verizon Patent And Licensing Inc. | Remote power outage & restoration notification |
| US8593151B2 (en) * | 2011-02-28 | 2013-11-26 | Jeffrey M Drazan | Inductive monitoring of a power transmission line of an electrical network |
| CN102279334A (en) * | 2011-08-30 | 2011-12-14 | 中国瑞林工程技术有限公司 | Lightning resistance horizontal dynamic monitoring method for electric transmission line poles and towers |
| WO2013115449A1 (en) * | 2012-01-31 | 2013-08-08 | 주식회사 케이에이치바텍 | Overhead power transmission and distribution line monitoring apparatus for selectively switching communication schemes of low-loss multi-directional antenna |
| CN103207340A (en) * | 2013-05-02 | 2013-07-17 | 深圳供电局有限公司 | On-line transmission line lightning shielding failure trip early-warning method |
| CN103474940A (en) * | 2013-09-28 | 2013-12-25 | 成都星河科技产业有限公司 | Comprehensive lightning protection system of electric transmission lines of high tower of power grid |
| CN103646148A (en) * | 2013-12-20 | 2014-03-19 | 国家电网公司 | Simulation method for calculating lightning back-striking performance of UHV transmission lines |
| CN103823101A (en) * | 2014-03-14 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for measuring impact current division coefficient of power transmission line tower with lightning conductor |
| CN204347122U (en) * | 2015-01-07 | 2015-05-20 | 云南电网有限责任公司玉溪供电局 | For reducing the thunderbolt detection system that the transmission line of electricity of tripping rate with lightning strike is transformed |
| CN105137286A (en) * | 2015-09-01 | 2015-12-09 | 国网新疆电力公司经济技术研究院 | Power transmission line lightning stroke monitoring device and lightning protection level assessment method |
| CN205016965U (en) * | 2015-10-26 | 2016-02-03 | 厦门理工学院 | Overhead transmission line lightning protection device and resistant thunder horizontal checkout system thereof |
| CN106918762A (en) * | 2015-12-25 | 2017-07-04 | 中国电力科学研究院 | A kind of overhead transmission line thunderbolt current monitoring method and lightning fault recognition methods |
| CN207623449U (en) * | 2017-11-14 | 2018-07-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC power transmission line lightning stroke trip failure shaft tower quick search device |
| CN109507552A (en) * | 2018-11-29 | 2019-03-22 | 清华大学 | Shaft tower shock wave impedance detection method and device based on tower top back wave |
| CN110361584A (en) * | 2019-08-04 | 2019-10-22 | 西南交通大学 | The risk assessment experiment porch and method of transmission line of lightning strike singlephase earth fault |
| CN110445082A (en) * | 2019-08-20 | 2019-11-12 | 长沙理工大学 | The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line |
Non-Patent Citations (3)
| Title |
|---|
| LU ZEJUN 等: "Calculation of lightning trip-out rates for 10 kV overhead distribution line", 《2014 INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP)》 * |
| 周海宏 等: "110kV同塔六回输电线路耐雷性能分析", 《电瓷避雷器》 * |
| 贾茹 等: "山区220kV输电线路绕击跳闸率的计算", 《东北电力大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021109634A1 (en) * | 2019-12-03 | 2021-06-10 | 广东电网有限责任公司 | Lightning trip rate testing method taking soil resistivity variation into account |
| WO2021109630A1 (en) * | 2019-12-03 | 2021-06-10 | 广东电网有限责任公司 | Method for evaluating lightning withstand level of power transmission line in lightning strike in high soil resistivity region |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110865270B (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110907773B (en) | Lightning-resistant level evaluation method for lightning-strike power transmission line in high-soil-resistivity area | |
| CN110865269B (en) | Power transmission line shielding failure trip rate evaluation method based on particle swarm optimization | |
| CN110865271B (en) | Lightning trip-out rate test method considering line soil resistivity differentiation | |
| CN110865266B (en) | Lightning-resistant horizontal test method for power transmission line of cross-shaped grounding device | |
| CN108020725B (en) | A kind of earth mat impulse earthed resistance measurement method under the influence of different soils pH value | |
| CN110865270B (en) | 220kV power transmission line counterattack trip-out rate test method under lightning stroke | |
| CN105224797B (en) | A kind of extra-high voltage large cross line counterattack trip-out rate computational methods | |
| CN110865268B (en) | Method for testing lightning trip-out rate of transmission tower in low-soil resistivity region | |
| CN113011099A (en) | Method for calculating and correcting lightning trip-out rate of power transmission line | |
| CN112529398B (en) | Estimation method for lightning trip-out rate of collecting line of wind power plant in high-altitude mountain area | |
| CN110865265B (en) | Method for testing counterattack trip-out rate of power transmission line in mountain area | |
| CN111931348B (en) | Method and system for automatically evaluating risk of induced lightning flashover of 10kV distribution network tower | |
| CN110865267B (en) | Evaluation method for shielding failure trip-out rate of 110kV power transmission line | |
| CN111239546A (en) | Lightning overvoltage on-line distance measurement and fault location method | |
| CN105740500A (en) | Composite tower overvoltage simulation model design method | |
| CN109815593B (en) | Analysis method for coupling propagation mechanism of successive faults of distribution network | |
| CN113777441B (en) | Lightning strike same-jump evaluation method and platform considering height of coupling ground wire | |
| Zhang et al. | Study on overvoltage of signal line in wind turbine by lightning strike | |
| CN113884825B (en) | Lightning stroke same-jump tolerance performance test method and system for 110kV power transmission line | |
| CN110879329A (en) | Lightning protection optimization and fault location method suitable for high-altitude landscape tower | |
| de Azevedo et al. | Porous Soil Effect on Backflashover Analysis of Power Transmission Lines | |
| CN114184766B (en) | Grounding grid soil hazard characteristic evaluation platform and method based on corrosive ions | |
| You et al. | Lightning model for HVDC transmission lines | |
| CN112505423B (en) | System and method for evaluating impact impedance distortion rate of horizontal grounding electrode | |
| CN114184765B (en) | Transformer substation grounding grid soil characteristic assessment method considering soil porosity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |