A system and method for measuring lightning response of real tower of transmission line

Abstract

The present invention discloses a system and method for measuring the lightning response of a real-type tower of a power transmission line. The system includes: an impulse current generating unit, a return pole, a voltage dividing unit, a voltage reference pole, a current measuring unit and a judgment unit; the impulse current generating unit is electrically connected to the top of the real-type tower under test through a current test wire, the impulse current generating unit is electrically connected to the return pole, and the impulse current generating unit injects an impulse current into the top of the real-type tower under test; the voltage dividing unit is electrically connected to the top of the real-type tower under test through a voltage test wire, and the voltage dividing unit is electrically connected to the voltage reference pole; the current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real-type tower under test through a signal transmission line; the judgment unit is electrically connected to the voltage dividing unit and the current measuring unit, respectively, and the judgment unit accurately obtains the performance judgment result of the lightning response of the real-type tower under test according to the voltage information, the impulse current information and the ground wire current information.

Description

Technical Field

[0001] The present invention relates to the field of high voltage electricity technology, and in particular to a system and method for measuring lightning response of a real-type tower of a transmission line. Background Art

[0002] my country is frequently struck by lightning every year. According to the classification statistics of power grid faults, in areas with relatively high tripping rates in my country, the number of times caused by lightning strikes accounts for about 40-70%, especially in areas with frequent lightning, high soil resistivity and complex terrain. The accident rate caused by lightning strikes is even higher. Transmission lines are an important part of the power system. Faults caused by lightning strikes on transmission lines are the primary cause of transmission line failures. Therefore, studying the lightning protection performance of transmission lines is of great significance for the safe and stable operation evaluation of transmission lines.

[0003] When a line is struck by lightning, the counter-attack voltage at the top of the tower is composed of the voltage on the impulse resistor on the tower grounding device and the induced voltage of the tower inductance effect when the lightning strikes. The greater the counter-attack voltage at the top of the tower, the lower the lightning resistance level of the tower. The voltage formed on the tower at the moment of lightning strike will be very high, which will cause the insulation of the normally operating wire to break down, forming a grounding fault and causing the line switch to trip. Therefore, obtaining accurate lightning response of transmission line towers plays a very important role in improving the safe operation of the power system.

[0004] The related technologies for measuring the lightning response of real towers of transmission lines have the following problems:

[0005] 1. At present, the measurement of real towers is mainly to measure their power frequency characteristics (such as the power frequency grounding resistance of the tower), and there is a lack of research on the response of real towers under lightning transients.

[0006] 2. At present, the impact transient measurement of the real tower is to conduct impact measurement on the tower grounding device, and does not take into account the inductance effect of the tower body when struck by lightning. However, with the increase in the voltage level of the transmission line, the tower height is getting higher and higher, and the inductance of the tower body cannot be ignored. Therefore, only measuring at the tower angle and only considering the tower grounding device will be quite different from the actual situation.

[0007] 3. At present, the research on the transient impact test of the real tower is carried out under the scaled model, but the equivalence of the scaled model needs further consideration. For the lightning response test of the real tower of the transmission line, due to the high experimental conditions and high operation difficulty, there is currently no mature test system or method.

[0008] 4. At present, the analysis of transient characteristics of power transmission line counterattacks and the application of protective measures rely heavily on electromagnetic transient simulation calculations. However, due to the complexity of the actual situation, it is extremely difficult to establish a broadband electromagnetic transient model that can fully cover the overvoltage band. Most of the existing broadband electromagnetic transient models are scattered test results of grounding devices, towers and other line facilities, which are difficult to reflect the impact of key issues such as ground wire shunting, refraction and reflection of each part, and multiple lightning strikes. Simulation calculations are usually based on a large number of model simplifications, which may lead to large differences between the calculation results and the actual situation. The results of theoretical analysis need to be verified by experiments, but there is a lack of a mature system or method that can measure the lightning response of real towers of transmission lines to obtain accurate tower lightning impulse response data. Summary of the invention

[0009] The present invention provides a system and method for measuring the lightning response of a true tower of a transmission line, so as to simultaneously consider the grounding device of the true tower and the inductance effect of the tower body, thereby accurately obtaining the lightning response data of the true tower and accurately obtaining the lightning response performance of the true tower.

[0010] According to one aspect of the present invention, a system for measuring lightning response of a real tower of a transmission line is provided, comprising:

[0011] An impulse current generating unit and a return pole, wherein the high voltage end of the impulse current generating unit is electrically connected to the top of the real pole tower under test through a current test wire, and the low voltage end of the impulse current generating unit is electrically connected to the return pole, and the impulse current generating unit is used to inject an impulse current into the top of the real pole tower under test;

[0012] A voltage divider unit and a voltage reference electrode, wherein the high voltage end of the voltage divider unit is electrically connected to the top of the real pole tower under test through a voltage test wire, and the low voltage end of the voltage divider unit is electrically connected to the voltage reference electrode, and the voltage divider unit is used to measure the voltage information between the top of the real pole tower under test and the voltage reference electrode;

[0013] A current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real tower to be tested through a signal transmission line; the current measuring unit is used to measure the impact current information on the current test wire and the ground wire current information on the overhead ground wire;

[0014] A judgment unit is electrically connected to the voltage dividing unit and the current measuring unit respectively, and is used to obtain a performance judgment result of the lightning response of the measured real tower according to the voltage information, the impulse current information and the ground wire current information.

[0015] Optionally, it also includes:

[0016] A pulling unit is mechanically connected to the current test wire, and is used to pull the current test wire so that the current test wire is kept in the air and is perpendicular to the overhead ground wire.

[0017] Optionally, the signal transmission line is arranged perpendicularly to the current testing wire, and the signal transmission line is arranged perpendicularly to the overhead ground wire.

[0018] Optionally, it also includes:

[0019] A supporting unit, wherein the supporting unit is used to support the voltage test wire so that the voltage test wire is parallel to the current test wire.

[0020] Optionally, the horizontal distance between the impulse current generating unit and the grounding device of the real tower under test is at least 1 times the reference distance;

[0021] The horizontal distance between the return pole and the grounding device of the real tower under test is at least 4 times the reference distance;

[0022] The reference distance is equal to the size of the grounding device of the real tower being measured.

[0023] Optionally, the horizontal distance between the voltage reference electrode and the grounding device of the real tower under test is at least 4 times the reference distance.

[0024] Optionally, at least two of the impulse current generating unit, the return electrode and the voltage reference electrode are arranged along the same straight line;

[0025] The impulse current generating unit and the return pole are located on the same side of the measured real-type pole tower, and the return pole and the voltage reference pole are located on different sides of the measured real-type pole tower.

[0026] Optionally, the pulling unit comprises a helium balloon.

[0027] Optionally, the support unit includes an insulating support rod.

[0028] Optionally, the current measuring unit includes a current probe and an oscilloscope;

[0029] The current test wire and the overhead ground wire are respectively provided with corresponding current probes, and the current probes are connected to the oscilloscope via the corresponding signal transmission lines.

[0030] Optionally, the overhead ground wire includes a first overhead ground wire and a second overhead ground wire;

[0031] The current measuring unit is used to measure the impact current information, the first ground wire current information and the second ground wire current information on the first overhead ground wire, and the third ground wire current information and the fourth ground wire current information on the second overhead ground wire;

[0032] The judgment unit is used to determine whether the performance of the lightning response of the measured real tower needs resistance reduction processing or meets safety design requirements based on the voltage information, the impulse current information, the first ground wire current information, the second ground wire current information, the third ground wire current information, the fourth ground wire current information, the preset insulation withstand voltage and the preset lightning strike current.

[0033] According to another aspect of the present invention, there is provided a method for measuring the lightning response of a real tower of a transmission line, comprising:

[0034] An impulse current generating unit and a return pole are provided, wherein the high voltage end of the impulse current generating unit is electrically connected to the top of the real pole tower under test through a current test wire, and the low voltage end of the impulse current generating unit is electrically connected to the return pole, and the impulse current generating unit is used to inject an impulse current into the top of the real pole tower under test;

[0035] A voltage divider unit and a voltage reference electrode are provided, wherein the high voltage end of the voltage divider unit is electrically connected to the top of the real pole tower under test through a voltage test wire, and the low voltage end of the voltage divider unit is electrically connected to the voltage reference electrode, and the voltage divider unit is used to measure the voltage information between the top of the real pole tower under test and the voltage reference electrode;

[0036] A current measuring unit is provided, and the current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real pole tower to be tested through a signal transmission line; the current measuring unit is used to measure the impact current information on the current test wire and the ground wire current information on the overhead ground wire;

[0037] A judgment unit is provided, which is electrically connected to the voltage dividing unit and the current measuring unit respectively, and is used to obtain a performance judgment result of the lightning response of the measured real tower according to the voltage information, the impulse current information and the ground wire current information.

[0038] Optionally, it also includes:

[0039] Setting the current test wire to be kept in the air and vertical to the overhead ground wire;

[0040] The signal transmission line is arranged to be perpendicular to the current test wire, and the signal transmission line is arranged to be perpendicular to the overhead ground wire;

[0041] The voltage test wire is arranged in parallel with the current test wire.

[0042] Optionally, it also includes:

[0043] Setting the horizontal distance between the impulse current generating unit and the grounding device of the real tower to be tested to be at least 1 times the reference distance;

[0044] Setting the horizontal distance between the return pole and the grounding device of the real tower to be tested to be at least 4 times the reference distance;

[0045] Setting the horizontal distance between the voltage reference electrode and the grounding device of the real tower to be tested to be at least 4 times the reference distance;

[0046] The impulse current generating unit and the return pole are arranged on the same side of the real-type pole tower under test, and the return pole and the voltage reference pole are arranged on different sides of the real-type pole tower under test;

[0047] Wherein, at least two of the impulse current generating unit, the return electrode and the voltage reference electrode are arranged along the same straight line, and the reference distance is equal to the size of the grounding device of the real tower under test.

[0048] The technical solution of the embodiment of the present invention realizes the injection of impulse current at the top of the real tower under test by setting an impulse current generating unit and a return pole, realizes the measurement of the top voltage of the real tower under test by setting a voltage dividing unit and a voltage reference pole, realizes the measurement of impulse current information and ground wire current information on the overhead ground wire of the real tower under test by setting a current measuring unit, and on this basis, realizes the simultaneous consideration of the grounding device of the real tower under test and the tower body inductance effect by setting a judgment unit, accurately obtains the lightning response data of the real tower under test, and the lightning response data includes voltage information, impulse current information, ground wire current information, current information on the grounding device of the real tower under test, and impedance information of the real tower under test, and then accurately obtains the lightning response performance of the real tower under test based on the lightning response data.

[0049] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 It is a structural schematic diagram of a system for measuring lightning response of a real tower of a transmission line provided by an embodiment of the present invention;

[0052] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the relative position of the medium current test wire and the real tower under test;

[0053] Figure 3 yes Figure 1 A partial enlarged schematic diagram of the relative position between the medium voltage test conductor and the real tower under test;

[0054] Figure 4 The present invention provides a flowchart of a method for measuring the lightning response of a real tower of a transmission line. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] Figure 1 is a schematic diagram of the structure of a system for measuring lightning response of a real tower of a transmission line provided by an embodiment of the present invention, Figure 1 The figure also shows multiple real pole towers, namely, real pole tower #1, real pole tower #2 and real pole tower #3. Real pole tower #2 is located between real pole tower #1 and real pole tower #3. As an example, real pole tower #2 is used as the real pole tower to be tested. The real pole tower to be tested includes an overhead ground wire 100 and a grounding device. The overhead ground wire 100 includes a first overhead ground wire 110 and a second overhead ground wire 120.

[0058] refer to Figure 1 , the system includes: an impulse current generating unit 210, a return pole 220, a voltage dividing unit 240, a voltage reference pole 250, a current measuring unit and a judging unit (not shown in the figure);

[0059] The impulse current generating unit 210 includes a high voltage end and a low voltage end. The high voltage end of the impulse current generating unit 210 is electrically connected to the top of the real pole tower under test through the current test wire 230. The low voltage end of the impulse current generating unit 210 is electrically connected to the return pole 220. The impulse current generating unit 210 is used to inject an impulse current into the top of the real pole tower under test.

[0060] The voltage divider unit 240 includes a high voltage end and a low voltage end. The high voltage end of the voltage divider unit 240 is electrically connected to the top of the real tower under test through a voltage test wire 260, and the low voltage end of the voltage divider unit 240 is electrically connected to a voltage reference electrode 250. The voltage divider unit 240 is used to measure the voltage information between the top of the real tower under test and the voltage reference electrode 250.

[0061] The current measuring unit is electrically connected to the current test wire 230 and the overhead ground wire of the real tower to be tested through the signal transmission line 273, and the current measuring unit is used to measure the impact current information on the current test wire 230 and the ground wire current information on the overhead ground wire;

[0062] The judgment unit is electrically connected to the voltage dividing unit 240 and the current measuring unit respectively, and is used to obtain a performance judgment result of the lightning response of the measured real tower according to the voltage information, the impulse current information and the ground wire current information.

[0063] Specifically, in order to simulate the actual situation of a lightning strike on a transmission line, it is necessary to inject an impulse current at the top of the real tower under test. The impulse current generating unit 210 is a unit capable of outputting an impulse current; illustratively, the impulse current generating unit 210 is an impulse current generator. When a real lightning strike occurs on the line, the lightning current is dispersed through the overhead ground wire of the tower and the tower grounding device. In the actual lightning response measurement, the impulse current output by the impulse current generating unit 210 must form a loop, so a return pole 220 is provided in this embodiment. A part of the impulse current injected into the top of the real tower under test from the current test wire 230 flows into the overhead ground wire of the real tower under test, and the remaining part flows into the grounding device and the earth in turn through the real tower under test, and then flows from the earth into the return pole 220, and finally flows back from the return pole 220 to the impulse current generating unit 210. The existence of the return pole 220 limits the propagation of the impulse current along the earth to infinity.

[0064] In order to measure the voltage at the top of the real-type tower under test, it is necessary to set a voltage reference point. Therefore, a voltage reference pole 250 is set in this embodiment, and a voltage divider unit 240 is also set. The voltage divider unit 240 is a unit that can measure the voltage between the top of the real-type tower under test and the voltage reference pole 250, that is, a unit that can obtain the voltage information between the top of the real-type tower under test and the voltage reference pole 250; illustratively, the voltage divider unit 240 includes a voltage divider 241 and an oscilloscope, such as a first oscilloscope 242.

[0065] The current measuring unit is a unit that can measure the current flowing on the conductor. The current measuring unit is electrically connected to the current test conductor 230 or is set by electromagnetic induction through the corresponding signal transmission line 273 to measure the impact current on the current test conductor 230, that is, to obtain the impact current information on the current test conductor 230; the current measuring unit is electrically connected to the overhead ground wire of the real tower under test or is set by electromagnetic induction through the corresponding signal transmission line 273 to measure the current on the overhead ground wire, that is, to obtain the ground wire current information on the overhead ground wire.

[0066] The specific implementation of the judgment unit can be a processor, or a logic circuit or unit with calculation and judgment functions, or a person, which is not limited in this embodiment. The above voltage information, impulse current information and ground wire current information are all lightning response data of the real tower under test measured in this embodiment, and the judgment unit can calculate other lightning response data of the real tower under test based on the voltage information, impulse current information and ground wire current information, such as calculating the current information on the grounding device of the real tower under test and the impedance information of the real tower under test. Since the system provided by this embodiment injects impulse current at the top of the real pole tower under test, the impulse current will flow through the tower body and grounding device of the real pole tower under test, so that the lightning response data of the real pole tower under test is the lightning response data that takes into account the inductance effect of the tower body and the grounding device of the real pole tower under test. Therefore, compared with the related art, the technical scheme of this embodiment has a higher accuracy in the lightning response data of the real pole tower under test, that is, the lightning response data of the real pole tower under lightning transient state under test is more accurate. Based on the lightning response data with high accuracy and reliability, the judgment unit can accurately obtain the lightning response performance of the real pole tower under test, for example, according to the impedance information of the real pole tower under test, the lightning response performance of the real pole tower under test needs to be reduced, or meets the safety design requirements (that is, the performance is good).

[0067] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the relative position of the medium current test wire and the real tower under test. Based on the above embodiment, as an implementation method of the present invention, combined with Figure 1 and Figure 2Optionally, the system further includes a lifting unit 280; the lifting unit 280 is mechanically connected to the current test wire 230, and the lifting unit 280 is used to lift and suspend the current test wire 230, so that the current test wire 230 is kept in the air (for example, basically kept at the height of the tower top, so as to be basically on the same horizontal plane as the top of the real tower being tested) and kept vertical to the overhead ground wire of the real tower being tested, so as to avoid electromagnetic coupling between the current test wire 230 and the overhead ground wire and affect the measurement result, that is, to avoid mutual interference between the current test wire 230 and the overhead ground wire. Based on this, this embodiment further improves the accuracy and reliability of the lightning response data of the real tower being tested, and further improves the accuracy and reliability of the lightning response performance judgment of the real tower being tested. This embodiment does not limit the specific implementation method of the lifting unit 280; illustratively, the lifting unit 280 includes a helium balloon.

[0068] Based on the above embodiments, as an implementation mode of the present invention, continue to refer to Figure 1 , the signal transmission line 273 is arranged vertically with the current test wire 230, and the signal transmission line 273 is also arranged vertically with the overhead ground wire. That is, the signal transmission line 273, the current test wire 230, and the overhead ground wire of the real pole tower to be tested are perpendicular to each other, and any two of them are 90 degrees apart. The advantage of such an arrangement is that electromagnetic coupling between any two of the signal transmission line 273, the current test wire 230, and the overhead ground wire of the real pole tower to be tested is avoided to affect the measurement results. Based on this, the present embodiment further improves the accuracy and reliability of the lightning response data of the real pole tower to be tested, and further improves the accuracy and reliability of the lightning response performance judgment of the real pole tower to be tested.

[0069] Figure 3 yes Figure 1 A partial enlarged schematic diagram of the relative position between the medium voltage test wire and the real tower under test. Based on the above embodiment, as an implementation method of the present invention, combined with Figure 1 and Figure 3Optionally, the system further includes a support unit 290; the support unit 290 is used to support the voltage test wire 260 so that the voltage test wire 260 is parallel to the current test wire 230. In this way, the voltage test wire 260, the signal transmission line 273, and the overhead ground wire of the real tower to be tested are perpendicular to each other, and any two of them are 90° apart. The advantage of this arrangement is that it avoids electromagnetic coupling between any two of the voltage test wire 260, the signal transmission line 273, and the overhead ground wire of the real tower to be tested, which affects the measurement results. Based on this, this embodiment further improves the accuracy and reliability of the lightning response data of the real tower to be tested, and further improves the accuracy and reliability of the lightning response performance judgment of the real tower to be tested. This embodiment does not limit the specific implementation method of the support unit 290; illustratively, the support unit 290 includes an insulating support rod.

[0070] As mentioned in the above embodiment, the existence of the return pole 220 limits the impulse current from propagating along the earth to infinity, so in the actual lightning response measurement, due to the existence of the return pole 220, the proportion of the impulse current injected into the measured real tower will be greater than the proportion in the actual lightning response measurement. Based on this, in order to ensure that the measurement results reflect the actual situation as much as possible, it is necessary to reduce the influence of the return pole 220 on the current in the measured real tower by reasonably setting the horizontal distance between the return pole 220 and the measured real tower; at the same time, it is also necessary to consider the actual measurement site and the size of the area occupied by the system layout to ensure the feasibility of the system layout at the actual measurement site.

[0071] In view of this, based on the above embodiments, as an implementation mode of the present invention, continue to refer to Figure 1 Optionally, the horizontal distance between the impulse current generating unit 210 and the grounding device of the real tower under test is at least 1 times the reference distance; the horizontal distance between the return pole 220 and the grounding device of the real tower under test is at least 4 times the reference distance; wherein the reference distance is equal to the size of the grounding device of the real tower under test. This arrangement can not only reduce the influence of the return pole 220 on the current in the real tower under test, thereby further improving the accuracy and reliability of the lightning response data of the real tower under test, but also ensure the feasibility of the system layout at the actual measurement site.

[0072] The current in the return pole 220 and the current flowing into the earth through the measured real tower will change the distribution of the electromagnetic field in the earth. Therefore, in the actual lightning response measurement, it is necessary to reasonably select the positions of the return pole 220 and the voltage reference pole 250 to ensure that the return pole 220, the measured real tower and the voltage reference pole 250 do not interfere with or affect each other, thereby further improving the accuracy and reliability of the lightning response data of the measured real tower.

[0073] In view of this, based on the above embodiments, as an implementation mode of the present invention, continue to refer to Figure 1 Optionally, the horizontal distance between the voltage reference electrode 250 and the grounding device of the real tower under test is at least 4 times the reference distance; on this basis, combined with Figures 1 to 3 Optionally, at least two of the impulse current generating unit 210, the return pole 220 and the voltage reference pole 250 are arranged along the same straight line; the impulse current generating unit 210 and the return pole 220 are located on the same side of the real-type tower under test, and the return pole 220 and the voltage reference pole 250 are located on different sides of the real-type tower under test (for example, the return pole 220 and the impulse current generating unit 210 are located on the left side of the real-type tower under test, while the voltage reference pole 250 and the voltage dividing unit 240 are located on the right side of the real-type tower under test). Such an arrangement can ensure that the return pole 220, the real-type tower under test and the voltage reference pole 250 do not interfere with or affect each other, thereby further improving the accuracy and reliability of the lightning response data of the real-type tower under test.

[0074] Based on the above embodiments, as an implementation mode of the present invention, continue to refer to Figure 1 Optionally, the current measuring unit includes a current probe 272 and an oscilloscope, for example, a second oscilloscope 271; corresponding current probes 272 are respectively arranged on the current test wire 230 and the overhead ground wire, and the current probe 272 is connected to the second oscilloscope 271 through a corresponding signal transmission line 273.

[0075] Based on the above embodiments, as an implementation mode of the present invention, continue to refer to Figure 1 Optionally, the current measuring unit is used to measure the impulse current information, the first ground wire current information and the second ground wire current information on the first overhead ground wire 110, and the third ground wire current information and the fourth ground wire current information on the second overhead ground wire 120; the judgment unit is used to determine whether the performance of the lightning response of the real tower under test requires resistance reduction processing or meets safety design requirements based on the voltage information, the impulse current information, the first ground wire current information, the second ground wire current information, the third ground wire current information, the fourth ground wire current information, the preset insulation withstand voltage and the preset lightning current.

[0076] Specifically, according to the technical solution of this embodiment, the Rogowski current coil is used to measure the impulse current information I and the first ground wire current information I a , the second ground line current information I b , the third ground current information I c , the fourth ground line current information I d , so that the judgment unit can obtain the stray current I of the real tower grounding device under test j =II a -I b -Ic -I d ; Then the judgment unit can be based on the voltage information U and the scattered current I j The impedance information R (also called lightning impulse impedance value R) of the real tower under test is obtained.

[0077] Based on this, the judgment unit analyzes and obtains the counter-attack voltage of the real tower under real lightning conditions (for example, if the preset real lightning current is 240kA, the counter-attack voltage of the real tower under test is U f =240kA×R), and with the preset insulation withstand voltage U n Compare and judge whether insulation breakdown will occur and thus form a ground fault. f Greater than the preset insulation withstand voltage, i.e., U f >U n If a real lightning strike occurs, a breakdown may occur. In this case, the real tower under test has potential safety hazards and its grounding device needs to be treated with resistance reduction. f <U n This indicates that the real tower under test meets the safety design requirements.

[0078] An embodiment of the present invention also provides a method for measuring the lightning response of a true-type tower of a transmission line. The method can be achieved by building a system for measuring the lightning response of a true-type tower of a transmission line as mentioned in any of the above embodiments to simultaneously consider the grounding device of the true-type tower and the inductance effect of the tower body, accurately obtain the lightning response data of the true-type tower, and accurately derive the lightning response performance of the true-type tower.

[0079] Figure 4 is a flow chart of a method for measuring lightning response of a real tower of a transmission line provided by an embodiment of the present invention, with reference to Figure 4 , methods include:

[0080] S110. Set a surge current generating unit and a return pole. The high voltage end of the surge current generating unit is electrically connected to the top of the real pole tower under test through a current test wire. The low voltage end of the surge current generating unit is electrically connected to the return pole. The surge current generating unit is used to inject surge current into the top of the real pole tower under test.

[0081] S120, setting a voltage divider unit and a voltage reference electrode, the high voltage end of the voltage divider unit is electrically connected to the top of the real tower under test through a voltage test wire, the low voltage end of the voltage divider unit is electrically connected to the voltage reference electrode, and the voltage divider unit is used to measure the voltage information between the top of the real tower under test and the voltage reference electrode.

[0082] S130, setting a current measuring unit, the current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real tower under test through the signal transmission line; the current measuring unit is used to measure the impact current information on the current test wire and the ground wire current information on the overhead ground wire.

[0083] S140, setting a judgment unit, the judgment unit is electrically connected to the voltage dividing unit and the current measuring unit respectively, and the judgment unit is used to obtain a performance judgment result of the lightning response of the measured real tower according to the voltage information, the impulse current information and the ground wire current information.

[0084] The execution order of the above steps S110 to S140 can be arbitrarily changed according to the actual system layout, and this embodiment does not limit this.

[0085] Based on the above embodiment, as an implementation mode of the present invention, optionally, the method further includes the following steps:

[0086] Set the current test lead high in the air and perpendicular to the overhead ground wire;

[0087] Set the signal transmission line perpendicular to the current test wire, and set the signal transmission line perpendicular to the overhead ground wire;

[0088] Set up the voltage test leads in parallel with the current test leads.

[0089] Based on the above embodiment, as an implementation mode of the present invention, optionally, the method further includes the following steps:

[0090] Set the horizontal distance between the impulse current generating unit and the grounding device of the real tower to be at least 1 times the reference distance;

[0091] Set the horizontal distance between the return pole and the grounding device of the real tower to be at least 4 times the reference distance;

[0092] Set the horizontal distance between the voltage reference electrode and the grounding device of the real tower to be tested to be at least 4 times the reference distance;

[0093] The impulse current generating unit and the return pole are arranged on the same side of the real pole tower to be measured, and the return pole and the voltage reference pole are arranged on different sides of the real pole tower to be measured;

[0094] Among them, at least two of the impulse current generating unit, the return electrode and the voltage reference electrode are arranged along the same straight line, and the size of the reference distance is equal to the size of the grounding device of the real tower to be tested.

[0095] The method for measuring the lightning response of a true-type tower of a transmission line and the system for measuring the lightning response of a true-type tower of a transmission line provided in the embodiments of the present invention both belong to the same inventive concept and can achieve the same technical effect, and the repeated contents will not be repeated here.

[0096] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0097] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for measuring the lightning response of a real tower of a transmission line, characterized in that: include: An impulse current generating unit and a return pole, wherein the high voltage end of the impulse current generating unit is electrically connected to the top of the real pole tower under test through a current test wire, and the low voltage end of the impulse current generating unit is electrically connected to the return pole, and the impulse current generating unit is used to inject an impulse current into the top of the real pole tower under test; A voltage divider unit and a voltage reference electrode, wherein the high voltage end of the voltage divider unit is electrically connected to the top of the real pole tower under test through a voltage test wire, and the low voltage end of the voltage divider unit is electrically connected to the voltage reference electrode, and the voltage divider unit is used to measure the voltage information between the top of the real pole tower under test and the voltage reference electrode; A current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real tower to be tested through a signal transmission line; The current measuring unit is used to measure the impact current information on the current test wire and the ground wire current information on the overhead ground wire; A judgment unit, electrically connected to the voltage dividing unit and the current measuring unit, respectively, and configured to obtain a performance judgment result of the lightning response of the real tower under test according to the voltage information, the impulse current information and the ground wire current information; The horizontal distance between the impulse current generating unit and the grounding device of the real tower under test is at least 1 times the reference distance; The horizontal distance between the return pole and the grounding device of the real tower under test is at least 4 times the reference distance; The reference distance is equal to the size of the grounding device of the real tower under test; The horizontal distance between the voltage reference electrode and the grounding device of the measured real tower is at least 4 times the reference distance; The overhead ground wire comprises a first overhead ground wire and a second overhead ground wire; The current measuring unit is used to measure the impact current information, the first ground wire current information and the second ground wire current information on the first overhead ground wire, and the third ground wire current information and the fourth ground wire current information on the second overhead ground wire; The judgment unit is used to determine whether the performance of the lightning response of the measured real tower needs resistance reduction processing or meets safety design requirements based on the voltage information, the impulse current information, the first ground wire current information, the second ground wire current information, the third ground wire current information, the fourth ground wire current information, the preset insulation withstand voltage and the preset lightning strike current.

2. The system for measuring lightning response of a real tower of a transmission line according to claim 1, characterized in that: Also includes: A pulling unit is mechanically connected to the current test wire, and is used to pull the current test wire so that the current test wire is kept in the air and is perpendicular to the overhead ground wire.

3. The system for measuring lightning response of a real tower of a transmission line according to claim 1 or 2, characterized in that: The signal transmission line is arranged perpendicularly to the current testing wire, and the signal transmission line is arranged perpendicularly to the overhead ground wire.

4. The system for measuring lightning response of a real tower of a transmission line according to claim 3, characterized in that: Also includes: A supporting unit, wherein the supporting unit is used to support the voltage test wire so that the voltage test wire is parallel to the current test wire.

5. The system for measuring lightning response of a real tower of a transmission line according to claim 1, characterized in that: At least two of the impulse current generating unit, the return electrode and the voltage reference electrode are arranged along the same straight line; The impulse current generating unit and the return pole are located on the same side of the measured real-type pole tower, and the return pole and the voltage reference pole are located on different sides of the measured real-type pole tower.

6. The system for measuring lightning response of a real tower of a transmission line according to claim 2, characterized in that: The pulling unit includes a helium balloon.

7. The system for measuring lightning response of a real tower of a transmission line according to claim 4, characterized in that: The supporting unit includes an insulating supporting rod.

8. The system for measuring lightning response of a real tower of a transmission line according to claim 1, characterized in that: The current measuring unit includes a current probe and an oscilloscope; The current test wire and the overhead ground wire are respectively provided with corresponding current probes, and the current probes are connected to the oscilloscope via the corresponding signal transmission lines.

9. A method for measuring the lightning response of a real tower of a transmission line, characterized in that: include: An impulse current generating unit and a return pole are provided, wherein the high voltage end of the impulse current generating unit is electrically connected to the top of the real pole tower under test through a current test wire, and the low voltage end of the impulse current generating unit is electrically connected to the return pole, and the impulse current generating unit is used to inject an impulse current into the top of the real pole tower under test; A voltage divider unit and a voltage reference electrode are provided, wherein the high voltage end of the voltage divider unit is electrically connected to the top of the real pole tower under test through a voltage test wire, and the low voltage end of the voltage divider unit is electrically connected to the voltage reference electrode, and the voltage divider unit is used to measure the voltage information between the top of the real pole tower under test and the voltage reference electrode; A current measuring unit is provided, wherein the current measuring unit is electrically connected to the current test wire and the overhead ground wire of the real tower to be tested through a signal transmission line; The current measuring unit is used to measure the impact current information on the current test wire and the ground wire current information on the overhead ground wire; A judgment unit is provided, the judgment unit is electrically connected to the voltage dividing unit and the current measuring unit respectively, and the judgment unit is used to obtain a performance judgment result of the lightning response of the measured real tower according to the voltage information, the impulse current information and the ground wire current information; Also includes: Setting the horizontal distance between the impulse current generating unit and the grounding device of the real tower to be tested to be at least 1 times the reference distance; Setting the horizontal distance between the return pole and the grounding device of the real tower to be tested to be at least 4 times the reference distance; Setting the horizontal distance between the voltage reference electrode and the grounding device of the real tower to be tested to be at least 4 times the reference distance; The impulse current generating unit and the return pole are arranged on the same side of the real-type pole tower under test, and the return pole and the voltage reference pole are arranged on different sides of the real-type pole tower under test; Wherein, at least two of the impulse current generating unit, the return electrode and the voltage reference electrode are arranged along the same straight line, and the size of the reference distance is equal to the size of the grounding device of the real tower under test; The overhead ground wire comprises a first overhead ground wire and a second overhead ground wire; The current measuring unit is used to measure the impact current information, the first ground wire current information and the second ground wire current information on the first overhead ground wire, and the third ground wire current information and the fourth ground wire current information on the second overhead ground wire; The judgment unit is used to determine whether the performance of the lightning response of the measured real tower needs resistance reduction processing or meets safety design requirements based on the voltage information, the impulse current information, the first ground wire current information, the second ground wire current information, the third ground wire current information, the fourth ground wire current information, the preset insulation withstand voltage and the preset lightning strike current.

10. The method for measuring lightning response of a real tower of a transmission line according to claim 9, characterized in that: Also includes: Setting the current test wire to be kept in the air and vertical to the overhead ground wire; The signal transmission line is arranged to be perpendicular to the current test wire, and the signal transmission line is arranged to be perpendicular to the overhead ground wire; The voltage test wire is arranged in parallel with the current test wire.

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