CN112595894A - Iron tower earthing device transient resistance temperature distortion characteristic test device - Google Patents
Iron tower earthing device transient resistance temperature distortion characteristic test device Download PDFInfo
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Abstract
The invention provides a transient resistance temperature distortion characteristic test device for an iron tower grounding device, which sets the temperature of test soil through an upper computer and performs sufficient and uniform temperature control on the soil around the iron tower grounding device through the test device; after the actual test temperature meets the requirements, injecting transient voltage into the iron tower grounding device through a transient voltage injection device, and measuring to obtain a transient discharge current amplitude; evaluating the temperature distortion characteristic of the transient resistance of the iron tower grounding device by the transient discharge current amplitude value and combining with the actual test temperature; the method can effectively simulate the distortion process of the resistance of the iron tower grounding device under the transient voltage at different soil temperatures, improves the test precision through full and uniform temperature control, and realizes accurate evaluation of the transient resistance temperature distortion characteristic of the iron tower grounding device.
Description
Technical Field
The invention relates to the technical field of power system grounding, in particular to a transient resistance temperature distortion characteristic test device for an iron tower grounding device.
Background
When suffering a lightning stroke, because the ground resistance of transmission tower itself, lightning stroke transient current can produce the overvoltage on the shaft tower main part, this makes lightning current pass through transmission tower easily and produces the counterattack to the circuit, leads to the emergence of accidents such as transmission line tripping operation, can make electric power system's stability and reliability reduce finally, so it is very necessary to study transmission tower earthing device's transient resistance distortion degree.
The electromagnetic transient process of lightning transient current in earthing device and the earth around it the scattered current is extremely complicated, generally speaking, lightning transient current amplitude is great, can inevitably make peripheral soil produce the spark effect when flowing into the earth through earthing device, and simultaneously, high voltage class's transmission tower's earthing device geometric dimension is great, so the mutual inductance between conductor self-inductance and the conductor on the earthing device is ignorable, under the effect of transient current, inductance effect can make earthing device transient resistance increase, and spark effect is on the contrary, makes it reduce. Meanwhile, because the grounding device is buried in the surrounding soil, the transient resistance distortion characteristic of the grounding device is closely related to the temperature of the surrounding soil of the grounding device, and the transient resistance distortion characteristics of the grounding device under the action of lightning current at different temperatures are not completely the same. At present, the influence of spark effect and inductance effect on the resistance of the grounding device is mainly researched domestically, and the research on the distortion degree of the transient resistance at different temperatures is less, so that a method is urgently needed, the influence of soil temperature can be considered, the transient resistance distortion characteristic of the iron tower grounding device is tested and evaluated at different temperatures, and reference suggestions are provided for the lightning protection design of a power transmission line.
The patent specification with the application number of 201910858674.8 discloses a phase current distortion-based single-phase earth fault line selection method for a neutral point ungrounded system, the line selection algorithm is simple, for the single-phase earth fault of the neutral point ungrounded system, after a voltage dip phase is judged to be a fault phase, only the effective current values of all line fault phases before and after the fault are extracted to carry out simple operation, and the line can be correctly selected; and for intermittent earth faults, the effective value of the phase current is increased after the line fault, and the phase current distortion rate epsilon i is also positive, so that the accuracy of line selection of the method is not influenced. However, the patent cannot realize the accurate and uniform control and regulation of the ambient soil temperature, and is beneficial to improving the accuracy of the transient voltage injection test and the accuracy of the evaluation of the transient resistance distortion characteristics of the grounding device at different temperatures. The test device is simple in operation, safe and stable, and the test device can test the grounding device of the iron tower and has universality.
Disclosure of Invention
The invention provides a test device for transient resistance temperature distortion characteristics of an iron tower grounding device, which can test and evaluate the transient resistance distortion characteristics of the iron tower grounding device at different temperatures by considering the influence of soil temperature.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a transient resistance temperature distortion characteristic test device for an iron tower grounding device comprises an iron tower grounding device, an open-close type injection electrode, a copper electrode joint, a high-voltage-resistant cable, a transient voltage injection device, a control bus, an upper computer, a temperature control bus, a temperature control analyzer, a first temperature controller, a second temperature controller, a third temperature controller, a fourth temperature controller, a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor;
the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are buried in soil around the iron tower grounding device and are all connected to a temperature control analyzer, the temperature control analyzer is connected with an upper computer through a temperature control bus, the iron tower grounding device, the open-close type injection electrode and the copper electrode connector are sequentially connected, the copper electrode connector is connected to the transient voltage injection device through a high-voltage-resistant cable, and the transient voltage injection device is connected with the upper computer through a control bus; the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively embedded in uniform soil around the iron tower grounding device to measure the thermodynamic temperature of the soil near the iron tower grounding device and are connected to the analysis input end of the temperature control analyzer, and the upper computer can be used for setting the test soil temperature T1Setting values are transmitted to a temperature control analyzer through a temperature control bus for analysis;
when the mathematical expectation of the data obtained at the analysis input of the temperature control analyzer is less than the set test soil temperature T1When the soil is heated, the temperature control analyzer controls the first temperature controller, the second temperature controller, the third temperature controller and the fourth temperature controller to heat the soil; when the temperature is higher than the test soil temperature T1When the soil is heated, the temperature control analyzer controls the first temperature controller, the second temperature controller, the third temperature controller and the fourth temperature controller to absorb heat to the uniform soil; the upper computer adjusts the soil temperature T of the test each time1And then, the device needs to work for more than 60 minutes, so that the uniform soil is fully and uniformly controlled in temperature, and the allowable temperature error is plus or minus 0.3K.
Furthermore, the transient voltage injection device is composed of an alternating current power supply, a transient high-voltage module, a charging control module, a protection resistor, a grounding control module, a transient high-voltage capacitor, a discharging control module, a discharging loop module and a transient current acquisition module; the alternating current power supply, the transient high-voltage module and the charging control module are connected in sequence and then connected to the grounding control module through the protection resistor; the discharge control module, the discharge loop module and the transient current acquisition module are connected in sequence and then connected to the grounding control module through the protection resistor; the transient high-voltage capacitor is connected to two ends of the discharge control module after being connected with the discharge loop module; the discharge loop module is also connected with the copper electrode joint; the transient current acquisition module is also connected with an upper computer; the transient high-voltage module is connected with an upper computer through a control bus; the grounding control module and the transient current acquisition module are grounded.
And furthermore, setting a preset transient voltage through a control bus by using an upper computer, starting a test discharging instruction, controlling a charging control module to be closed, charging the transient high-voltage capacitor according to the preset transient voltage, controlling the discharging control module to be closed when the voltage reaches a preset value, discharging the transient high-voltage capacitor through a discharging loop module, a high-voltage-resistant cable, a copper electrode joint, an open-close type injection electrode, an iron tower grounding device and uniform soil, measuring a transient discharging current amplitude I through a transient current acquisition module, and transmitting the transient discharging current amplitude I to the upper computer for storing records.
Further, the transient discharge current amplitude I and the actual test temperature T are collected through the device, and the transient resistance distortion characteristic parameter k of the iron tower grounding device is calculated as follows:
calculating a first-order distortion influence factor k by using the formula (1) and the formula (2)LAnd a second order distortion factor kI：
In the formulas (1) to (2), L is the total length of the iron tower grounding device, I is the transient discharge current amplitude, and exp is an exponential function with a natural constant e as a base in high mathematics;
calculating the temperature influence factor k by the formula (3)T：
kT＝[ρ-0.0239966ρ·(T-298.15)+0.0007425ρ·(T-298.15)2-0.0000225ρ·(T-298.15)3]-0.4 (3)
In the formula (3), T is the actual test temperature, and rho is the resistivity of the soil near the iron tower grounding device;
calculating the global factor k by equation (4)1：
Calculating the transient resistance distortion characteristic parameter of the iron tower grounding device by the formula (5):
evaluating the transient resistance temperature distortion characteristic of the iron tower grounding device under the transient discharge current amplitude I and the actual test temperature T through k obtained by calculation:
when k is equal to (0.833,1.2), the transient resistance distortion characteristic of the iron tower grounding device is weaker; when k is equal to (0.666, 0.833) U [1.2,1.5), the transient resistance distortion characteristic of the iron tower grounding device is general; when k belongs to (0.4, 0.666) U [1.5,2.5), the transient resistance distortion characteristic of the iron tower grounding device is strong, and various conditions are proposed to take the resistance distortion influence into account; when k ∈ (0,0.4 [ [2.5 ] ] ∞, the transient resistance distortion characteristic of the iron tower grounding device is extremely strong, and the resistance distortion effect must be considered during design.
Before the device is used for testing, the data of an analysis input end of a temperature control analyzer (11) is recorded, the mathematical expectation of the temperature control analyzer is obtained through calculation and recorded as an actual test temperature T, and the actual test temperature T of each test is stored and recorded in an upper computer (9) through a temperature control bus (10); different test soil temperatures T can be set through the upper computer (9)1Adjusting the soil temperature T of the test each time1And then, the device works for more than 60 minutes at least to fully and uniformly control the soil temperature and improve the transient resistance temperature distortion characteristic of the iron tower grounding device under different actual test temperaturesAnd (6) evaluating.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, by establishing the temperature control test device for the transient resistance distortion characteristic of the iron tower grounding device, a general iron tower grounding system and the surrounding soil environment can be effectively simulated; the testing device can accurately and uniformly control and adjust the temperature of the surrounding soil, and is beneficial to improving the accuracy of the transient voltage injection test and the accuracy of the evaluation of the transient resistance distortion characteristics of the grounding device at different temperatures. The test device is simple in operation, safe and stable, and the test device can test the grounding device of the iron tower and has universality.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
fig. 2 is an internal schematic view of the transient voltage injection 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 test device for transient resistance temperature distortion characteristics of an iron tower grounding device is characterized by comprising an iron tower grounding device 1, an open-close type injection electrode 4, a copper electrode joint 5, a high voltage resistant cable 6, a transient voltage injection device 7, a control bus 8, an upper computer 9, a temperature control bus 10, a temperature control analyzer 11, a first temperature controller 121, a second temperature controller 122, a third temperature controller 123, a fourth temperature controller 124, a first temperature sensor 131, a second temperature sensor 132, a third temperature sensor 133 and a fourth temperature sensor 134;
the temperature sensor I131, the temperature sensor II 132, the temperature sensor III 133 and the temperature sensor IV 134 are buried in soil 2 around the iron tower grounding device 1 and are all connected to the temperature control analyzer 11, the temperature control analyzer 11 is connected with the upper computer 9 through a temperature control bus 10, the iron tower grounding device 1, the open-close type injection electrode 4 and the copper electrode connector 5 are sequentially connected, the copper electrode connector 5 is connected to the transient voltage injection device 7 through a high-voltage-resistant cable 6, and the transient voltage injection device 7 is connected with the upper computer 9 through a control bus 8.
The first temperature sensor 131, the second temperature sensor 132, the third temperature sensor 133 and the fourth temperature sensor 134 are respectively embedded in the uniform soil 2 around the iron tower grounding device 1 to measure the thermodynamic temperature of the soil near the iron tower grounding device 1 and are all connected to the analysis input end of the temperature control analyzer 11, and the upper computer 9 can be used for setting the test soil temperature T1Setting values are transmitted to a temperature control analyzer 11 through a temperature control bus 10 for analysis; when the mathematical expectation of the data obtained at the analysis input of the temperature control analyzer 11 is less than the set test soil temperature T1In the meantime, the temperature control analyzer 11 controls the first temperature controller 121, the second temperature controller 122, the third temperature controller 123 and the fourth temperature controller 124 to heat the soil 2; when the temperature is higher than the test soil temperature T1In the meantime, the temperature control analyzer 11 controls the first temperature controller 121, the second temperature controller 122, the third temperature controller 123 and the fourth temperature controller 124 to absorb heat to the uniform soil 2; the upper computer 9 adjusts the soil temperature T of the test each time1Then, the device needs to work for more than 60 minutes, so that the uniform soil 2 can be fully and uniformly controlled in temperature, and the temperature allowable error is plus or minus 0.3K.
As shown in fig. 2, the transient voltage injection device 7 is composed of an ac power supply 14, a transient high voltage module 15, a charging control module 16, a protection resistor 17, a grounding control module 18, a transient high voltage capacitor 19, a discharging control module 20, a discharging loop module 21, and a transient current collection module 22; the alternating current power supply 14, the transient high-voltage module 15 and the charging control module 16 are connected in sequence and then are connected to the grounding control module 18 through the protection resistor 17; the discharge control module 20, the discharge loop module 21 and the transient current acquisition module 22 are connected in sequence and then connected to the grounding control module 18 through the protection resistor 17; the transient high-voltage capacitor 19 is connected to two ends of the discharge control module 20 after being connected with the discharge loop module 21; the discharge loop module 21 is also connected with the copper electrode joint 5; the transient current acquisition module 22 is also connected with the upper computer 9; the transient high-voltage module 15 is connected with the upper computer 9 through a control bus 8; the grounding control module 18 and the transient current collection module 22 are both grounded.
The method comprises the steps that a preset transient voltage is set through a control bus 8 by an upper computer 9, a test discharging instruction is started, a charging control module 16 is controlled to be closed, a transient high-voltage capacitor 19 is charged according to the preset transient voltage, when the voltage reaches a preset value, a discharging control module 20 is controlled to be closed, the transient high-voltage capacitor 19 discharges through a discharging loop module 21, a high-voltage-resistant cable 6, a copper electrode joint 5, an open-close type injection electrode 4, an iron tower grounding device 1 and uniform soil 2, meanwhile, a transient discharging current amplitude I is measured through a transient current collecting module 22 and is transmitted to the upper computer 9 to be stored and recorded.
Example 2
A method for testing transient resistance temperature distortion characteristics of an iron tower grounding device comprises the following steps:
the first step is as follows: the temperature control test device for the transient resistance distortion characteristic of the iron tower grounding device is built and comprises an iron tower grounding device 1, uniform soil 2, a sand pool 3, an open-close type injection electrode 4, a copper electrode joint 5, a high-voltage-resistant cable 6, a transient voltage injection device 7, a control bus 8, an upper computer 9, a temperature control bus 10, a temperature control analyzer 11, a first temperature controller 121, a second temperature controller 122, a third temperature controller 123, a fourth temperature controller 124, a first temperature sensor 131, a second temperature sensor 132, a third temperature sensor 133 and a fourth temperature sensor 134.
The second step is that: setting and controlling the test temperature of the homogeneous soil 2: wherein, the first temperature sensor 131, the second temperature sensor 132, the third temperature sensor 133 and the fourth temperature sensor 134 are respectively embedded in the uniform soil 2 around the iron tower grounding device 1 to measure the thermodynamic temperature of the soil near the iron tower grounding device 1 and are connected to the analysis input end of the temperature control analyzer 11, and the upper computer 9 can be used for realizing the purposes of measuring the thermodynamic temperature of the soil and analyzing the soilSetting the test soil temperature T1The set value is transmitted to the temperature control analyzer 11 for analysis through the temperature control bus 10, and when the mathematical expectation of the data obtained at the analysis input is less than the set test soil temperature T1In the meantime, the temperature control analyzer 11 controls the first temperature controller 121, the second temperature controller 122, the third temperature controller 123 and the fourth temperature controller 124 to heat the uniform soil 2; when the temperature is higher than the test soil temperature T1In the meantime, the temperature control analyzer 11 controls the first temperature controller 121, the second temperature controller 122, the third temperature controller 123 and the fourth temperature controller 124 to absorb heat into the homogeneous soil 2. Adjusting the soil temperature T of the test each time1Then, the device needs to work for more than 60 minutes, so that the uniform soil 2 is fully and uniformly controlled in temperature, and the allowable temperature error is plus or minus 0.3K; the data of an analysis input end of the temperature control analyzer 11 is recorded before the test, the mathematical expectation of the data is obtained through calculation and recorded as the actual test temperature T, and the actual test temperature T of each test is stored and recorded on the upper computer 9 through the temperature control bus 10.
The third step: injecting transient voltage into the iron tower grounding device 1 and recording the transient discharge current amplitude I under the actual test temperature T; the transient voltage injection device 7 is composed of an alternating current power supply 14, a transient high voltage module 15, a charging control module 16, a protective resistor 17, a grounding control module 18, a transient high voltage capacitor 19, a discharging control module 20, a discharging loop module 21, a transient current acquisition module 22 and a device shell 23; after the actual test temperature T meets the requirement, an upper computer 9 can be used for setting a preset transient voltage through a control bus 8 and starting a test discharging instruction, a charging control module 16 is controlled to be closed, a transient high-voltage capacitor 19 is charged according to the preset transient voltage, when the voltage reaches a preset value, a discharging control module 20 is controlled to be closed, the transient high-voltage capacitor 19 discharges through a discharging loop module 21, a high-voltage-resistant cable 6, a copper electrode connector 5, an open-close type injection electrode 4, an iron tower grounding device 1 and uniform soil 2, meanwhile, a transient discharging current amplitude I is measured through a transient current collecting module 22 and is transmitted to the upper computer 9 through the control bus 8 to be stored; if the discharge of the test product needs to be stopped after the test is finished, or residual voltage exists on the capacitor after the test is finished, the charge of the transient high-voltage capacitor 19 can be consumed through the protective resistor 17 by closing the grounding control module 18, so that the safety of equipment and personnel is ensured.
The fourth step: calculating transient resistance distortion characteristic parameters of the iron tower grounding device through the transient discharge current amplitude I measured in the test and the actual test temperature T:
calculating a first order distortion influence factor k by using equations (6) and (7)LAnd a second order distortion factor kI：
In the formulas (6) to (7), L is the total length of the iron tower grounding device 1 and is expressed by m; i is the transient discharge current amplitude, the unit is kA, and exp is an exponential function with a natural constant e as a base in higher mathematics.
Calculation of the temperature influence factor k by equation (8)T：
kT＝[ρ-0.0239966ρ·(T-298.15)+0.0007425ρ·(T-298.15)2-0.0000225ρ·(T-298.15)3]-0.4 (8)
In the formula (8), T is the actual test temperature and has a unit of K; ρ is the resistivity of the soil near the iron tower grounding device 1, and has a unit of Ω · m.
Calculating the global factor k by equation (9)1：
The transient resistance distortion characteristic parameter of the iron tower grounding device 1 is calculated by the formula (10):
and fifthly, evaluating the transient resistance temperature distortion characteristic of the iron tower grounding device 1 under the transient discharge current amplitude I and the actual test temperature T through the transient resistance distortion characteristic parameter k obtained by calculation: when k is equal to (0.833,1.2), the transient resistance distortion characteristic of the iron tower grounding device 1 is weak; when k is equal to (0.666, 0.833) and U [1.2,1.5), the transient resistance distortion characteristic of the iron tower grounding device 1 is general; when k belongs to (0.4, 0.666) U [1.5,2.5), the transient resistance distortion characteristic of the iron tower grounding device 1 is strong, and various conditions are proposed to take resistance distortion influence into account; when k ∈ (0,0.4 [ [2.5 ] ] ∞, the transient resistive distortion characteristics of the tower grounding device 1 are extremely strong, and the resistive distortion effect must be considered in design.
Sixthly, performing a transient resistance temperature distortion characteristic test of the iron tower grounding device 1 at different temperatures, and setting different test soil temperatures T through the upper computer 91And repeating the third, fourth and fifth steps, taking care to adjust the soil temperature T of the test each time1And finally, the device is allowed to work for more than 60 minutes at least to fully and uniformly control the soil temperature, and finally the transient resistance temperature distortion characteristics of the iron tower grounding device 1 at different actual test temperatures are evaluated.
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 (10)
1. A transient resistance temperature distortion characteristic test device for an iron tower grounding device is characterized by comprising an iron tower grounding device (1), an open-close type injection electrode (4), a copper electrode joint (5), a high-voltage resistant cable (6), a transient voltage injection device (7), a control bus (8), an upper computer (9), a temperature control bus (10), a temperature control analyzer (11), a first temperature controller (121), a second temperature controller (122), a third temperature controller (123), a fourth temperature controller (124), a first temperature sensor (131), a second temperature sensor (132), a third temperature sensor (133) and a fourth temperature sensor (134);
the temperature sensor I (131), the temperature sensor II (132), the temperature sensor III (133) and the temperature sensor IV (134) are buried in soil (2) around the iron tower grounding device (1) and are connected to the temperature control analyzer (11), the temperature control analyzer (11) is connected with the upper computer (9) through a temperature control bus (10), the iron tower grounding device (1), the open-close type injection electrode (4) and the copper electrode connector (5) are sequentially connected, the copper electrode connector (5) is connected to the transient voltage injection device (7) through a high-voltage-resistant cable (6), and the transient voltage injection device (7) is connected with the upper computer (9) through a control bus (8).
2. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 1, wherein a first temperature sensor (131), a second temperature sensor (132), a third temperature sensor (133) and a fourth temperature sensor (134) are respectively embedded in uniform soil (2) around the iron tower grounding device (1) to measure the thermodynamic temperature of the soil near the iron tower grounding device (1) and are connected to the analysis input end of a temperature control analyzer (11), and a test soil temperature T can be set through an upper computer (9)1The set values are transmitted to a temperature control analyzer (11) for analysis through a temperature control bus (10).
3. The testing device for transient resistance temperature distortion characteristics of iron tower grounding device according to claim 2, characterized in that when the mathematical expectation of the data obtained at the analysis input end of the temperature control analyzer (11) is less than the set test soil temperature T1Then, the temperature control analyzer (11) controls the first temperature controller (121) and the second temperature controller (1)22) The soil (2) is heated by the temperature controller III (123) and the temperature controller IV (124); when the temperature is higher than the test soil temperature T1And in the process, the temperature control analyzer (11) controls the first temperature controller (121), the second temperature controller (122), the third temperature controller (123) and the fourth temperature controller (124) to absorb heat for the uniform soil (2).
4. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 3, characterized in that the upper computer (9) adjusts the test soil temperature T each time1And then, the device needs to work for more than 60 minutes, so that the uniform soil (2) is fully and uniformly controlled in temperature, and the allowable temperature error is plus or minus 0.3K.
5. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 4, wherein the transient voltage injection device (7) is composed of an alternating current power supply (14), a transient high voltage module (15), a charging control module (16), a protection resistor (17), a grounding control module (18), a transient high voltage capacitor (19), a discharging control module (20), a discharging loop module (21) and a transient current acquisition module (22); the alternating current power supply (14), the transient high-voltage module (15) and the charging control module (16) are connected in sequence and then are connected to the grounding control module (18) through the protection resistor (17); the discharge control module (20), the discharge loop module (21) and the transient current acquisition module (22) are connected in sequence and then are connected to the grounding control module (18) through the protection resistor (17); the transient high-voltage capacitor (19) is connected to the two ends of the discharge control module (20) after being connected with the discharge loop module (21); the discharge loop module (21) is also connected with the copper electrode joint (5); the transient current acquisition module (22) is also connected with the upper computer (9); the transient high-voltage module (15) is connected with the upper computer (9) through a control bus (8); the grounding control module (18) and the transient current acquisition module (22) are grounded.
6. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 5, characterized in that an upper computer (9) is used for setting a preset transient voltage through a control bus (8) and starting a test discharge command to control a charging control module (16) to be closed, a transient high-voltage capacitor (19) is charged according to the preset transient voltage, when the voltage reaches a preset value, a discharging control module (20) is controlled to be closed, the transient high-voltage capacitor (19) is discharged through a discharging loop module (21), a high-voltage resistant cable (6), a copper electrode joint (5), an open-close type injection electrode (4), an iron tower grounding device (1) and uniform soil (2), and meanwhile, a transient discharge current amplitude I is measured through a transient current acquisition module (22) and is transmitted to the upper computer (9) for storing and recording.
7. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 6, characterized in that transient discharge current amplitude I and actual test temperature T are collected by the device, and transient resistance distortion characteristic parameter k of the iron tower grounding device is calculated:
calculating a first-order distortion influence factor k by using the formula (1) and the formula (2)LAnd a second order distortion factor kI：
In the formulas (1) to (2), L is the total length of the iron tower grounding device (1), I is the transient discharge current amplitude, and exp is an exponential function with a natural constant e as a base in higher mathematics;
calculating the temperature influence factor k by the formula (3)T：
kT＝[ρ-0.0239966ρ·(T-298.15)+0.0007425ρ·(T-298.15)2-0.0000225ρ·(T-298.15)3]-0.4 (3)
In the formula (3), T is the actual test temperature, and rho is the resistivity of the soil near the iron tower grounding device (1);
calculating the global factor k by equation (4)1：
Calculating transient resistance distortion characteristic parameters of the iron tower grounding device (1) by using an equation (5):
8. the iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 7, wherein the iron tower grounding device (1) transient resistance temperature distortion characteristic under the transient discharge current amplitude I and the actual test temperature T is evaluated through k obtained by calculation:
when k is equal to (0.833,1.2), the transient resistance distortion characteristic of the iron tower grounding device (1) is weaker; when k is belonged to (0.666, 0.833) and U [1.2,1.5), the transient resistance distortion characteristic of the iron tower grounding device (1) is general; when k belongs to (0.4, 0.666) U [1.5,2.5), the transient resistance distortion characteristic of the iron tower grounding device (1) is stronger; when k ∈ (0,0.4 [. sup.2.5 ] + ∞), the transient resistance distortion characteristic of the grounding device is extremely strong.
9. The testing device for the transient resistance temperature distortion characteristic of the iron tower grounding device according to claim 8 is characterized in that before the testing device is used for testing, the data of an analysis input end of the temperature control analyzer (11) is recorded, the mathematical expectation of the data is obtained through calculation, the mathematical expectation is recorded as the actual testing temperature T, and the actual testing temperature T of each test is stored and recorded on the upper computer (9) through the temperature control bus (10).
10. The iron tower grounding device transient resistance temperature distortion characteristic test device according to claim 9, characterized in that different test soil temperatures T can be set through the upper computer (9)1Adjusting the soil temperature T of the test each time1Then, the device is operated for more than 60 minutes at least to fully and uniformly control the soil temperature,and evaluating the transient resistance temperature distortion characteristics of the iron tower grounding device (1) at different actual test temperatures.
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| CN118091407A (en) * | 2024-04-23 | 2024-05-28 | 荣成市泰锞机械有限公司 | Method and device for testing insulation performance of engine stator |
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| CN107045083A (en) * | 2017-05-29 | 2017-08-15 | 西南交通大学 | Condition of different temperatures is got off download cable terminal dielectric spectroscopy experimental system and method |
| JP2019039764A (en) * | 2017-08-24 | 2019-03-14 | トヨタ自動車株式会社 | Impedance estimating device |
| CN111965402A (en) * | 2020-07-10 | 2020-11-20 | 重庆大学 | Portable impact impedance measuring device |
| CN111985109A (en) * | 2020-08-24 | 2020-11-24 | 西南交通大学 | Lightning protection effective size coefficient evaluation method for horizontal grounding body at different temperatures |
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| CN106093575A (en) * | 2016-06-01 | 2016-11-09 | 国网河北省电力公司电力科学研究院 | A kind of method measuring conductor resistivity at room temperature and temperature-coefficient of electrical resistance under alternating temperature |
| CN107045083A (en) * | 2017-05-29 | 2017-08-15 | 西南交通大学 | Condition of different temperatures is got off download cable terminal dielectric spectroscopy experimental system and method |
| JP2019039764A (en) * | 2017-08-24 | 2019-03-14 | トヨタ自動車株式会社 | Impedance estimating device |
| CN111965402A (en) * | 2020-07-10 | 2020-11-20 | 重庆大学 | Portable impact impedance measuring device |
| CN111985109A (en) * | 2020-08-24 | 2020-11-24 | 西南交通大学 | Lightning protection effective size coefficient evaluation method for horizontal grounding body at different temperatures |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118091407A (en) * | 2024-04-23 | 2024-05-28 | 荣成市泰锞机械有限公司 | Method and device for testing insulation performance of engine stator |
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