Portable lightning simulation impulse test device

Abstract

The present invention discloses a movable lightning simulation impulse test device, which includes a control console, a control box and a lightning generator body. The lightning generator body includes a first isolation transformer, a second isolation transformer, a third isolation transformer, a digital oscilloscope, a shunt, a rectifier, a charging device, a plurality of discharge balls, an impulse voltage divider and a grounding device. The impulse current is set as a standard lightning current waveform in the control console, and the impulse current amplitude is adjusted through the control box; the ball gap between the discharge balls is adjusted through the control console; and the grounding device is formed by welding steel plates arranged in a sand pit. The device can intelligently control the generated voltage and current and the ball gap distance of the generator body, and the test operation is very simple, and lightning characteristic related tests can be carried out.

Description

Technical Field

[0001] The invention relates to the technical field of electric power testing devices, and in particular to a movable lightning simulation impact testing device. Background Art

[0002] In recent years, with the rapid development of power grids and the increase in severe convective weather, lightning damage has shown some new characteristics. Serious faults such as two-phase flashover of lines caused by lightning, simultaneous flashover of double-circuit lines on the same tower, and successive tripping of multiple lines in the same transmission channel have increased significantly. However, at present, the transmission and distribution lines mainly adopt standardized and typical lightning protection designs. Different towers and sections of the whole line are often configured for lightning protection according to unified standards, without carefully considering the differences in lightning activity intensity, topography and tower structure in the line corridor. The design scheme made in this way usually cannot meet the differentiated requirements of lightning protection performance of the whole line, making some towers and sections very likely to become concentrated areas of lightning damage after commissioning, and lightning faults of the line occur frequently. After the lightning trip, not only the fault point needs to be found quickly, but also the damaged insulator needs to be replaced with power on or off, which makes the operation and maintenance work difficult. Once the line is built, the cost of lightning protection transformation is huge and the transformation effect is not obvious.

[0003] With the rapid economic development, the number of power grid equipment is increasing day by day. The increasing power consumption year by year has put higher and higher requirements on the safe and reliable operation of urban distribution networks. Failures of distribution lines and equipment not only increase operating costs, but also affect the orderly production of users. Therefore, regular maintenance of distribution lines and equipment is particularly important and has become an important power work.

[0004] The maintenance and repair of distribution lines and electrical equipment are usually divided into two states: normal and faulty. The defects of this management mode of maintenance or repair by judging the normal or faulty state are as follows: fault repair is generally passive and unpredictable, which expands the scope of maintenance, increases maintenance time and increases safety risks; the previous regular maintenance is relatively conservative, and maintenance is generally arranged at prescribed time intervals, which often results in "over-maintenance" and "under-maintenance" problems, affecting production and wasting resources. Therefore, the reasonable maintenance mode should be preventive maintenance based on power supply reliability, which is the so-called condition maintenance.

[0005] The status assessment and status prediction maintenance of power distribution equipment and lines are scientific decisions for operation and maintenance. Use detection instruments to detect related equipment, compare the obtained parameters, conduct in-depth analysis of the equipment, evaluate the equipment and line status information, and analyze the development trend of equipment defects. However, there is a lack of relevant test platforms for the study of lightning characteristics. Summary of the invention

[0006] The purpose of the present invention is to design a movable lightning simulation impact test device, which is composed of an operating table, a control box and a generator body. The device can intelligently control the generated voltage and current and the ball gap distance of the generator body. The test operation is very simple and can be used for lightning characteristic related tests.

[0007] In order to achieve the above technical purpose, the present invention provides a technical solution, which is a portable lightning simulation impact test device, including a control console, a control box and a lightning generator body, wherein the lightning generator body includes a first isolation transformer, a second isolation transformer, a third isolation transformer, a digital oscilloscope, a shunt, a rectifier, a charging device, a plurality of discharge balls, an impact voltage divider and a grounding device, wherein the controller is electrically connected to the control box, the power supply supplies power to the control box through the first isolation transformer, the control box is connected to the input end of the rectifier through the third isolation transformer, and the output end of the rectifier is connected to the input end of the rectifier. The device is electrically connected to the input end of the charging device, the output end of the charging device serves as the input end of the impulse voltage divider, the output end of the impulse voltage divider is connected to the grounding device through a discharge ball, one end of the shunt is electrically connected to the input end of the rectifier, the other end of the shunt is electrically connected to the first output end of the digital oscilloscope, the second output end of the digital oscilloscope is electrically connected to the impulse voltage divider, and the input end of the digital oscilloscope is electrically connected to the output end of the second isolation transformer; the impulse current is set as a standard lightning current waveform in the control console, and the impulse current amplitude is adjusted through the control box; the ball gap between the discharge balls is adjusted through the control console.

[0008] In this scheme, the test device includes an operating table, a control box, an impulse high current generator and an artificial sand pool. It is a set of movable impulse high voltage and high current generator test equipment that can simulate lightning impulse waves. It can intelligently control the generated voltage and current and the ball gap distance of the generator body, and the test operation is very simple. The control box and the corresponding control circuit are powered by an isolation transformer, and the impulse current waveform into the ground and the impulse voltage waveform on the centralized grounding device are measured respectively. It can carry out lightning impulse characteristic tests, record the impulse voltage and current waveforms under different conditions, and calculate the impulse grounding resistance. In the test, an impulse voltage divider and a shunt are used to measure the voltage and current respectively, and the test waveform is recorded by connecting a digital oscilloscope.

[0009] In the test, the impulse current is set to a standard lightning current waveform, and the impulse current amplitude is adjusted by a control box as a preferred method. The rectifier includes a diode D1, a diode D2 and a capacitor C1. The first end of the capacitor C1 is electrically connected to the first output end of the third isolation transformer, the second output end of the third isolation transformer is electrically connected to the anode end of the diode D1, and the cathode end of the diode D1 is electrically connected to the anode end of the diode D2 and the second end of the capacitor C1, respectively.

[0010] Preferably, the charging device includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, an inductor L5, an inductor L6, an inductor L7, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5; the first end of the inductor L1 is electrically connected to the cathode end of the diode D2, the second end of the inductor L1 is electrically connected to the first end of the capacitor C2 and the first end of the inductor L3 respectively; the second end of the capacitor C2 is electrically connected to the anode end of the diode D1 and the first end of the inductor L2 respectively; the second end of the inductor L3 is electrically connected to the first end of the inductor L4 and the first end of the capacitor C3 respectively, the second end of the inductor L2 is electrically connected to the second end of the capacitor C3 and the first end of the inductor L5 respectively, the second end of the inductor L4 is electrically connected to the first end of the inductor L6 and the first end of the capacitor C4 respectively, the second end of the inductor L5 is electrically connected to the second end of the capacitor C4 and the first end of the inductor L7 respectively, the second end of the inductor L6 is electrically connected to the first end of the capacitor C5 and the discharge ball respectively; the second end of the inductor L7 is electrically connected to the capacitor C5 respectively The second end of the impulse voltage divider is electrically connected to one end of the impulse voltage divider.

[0011] Preferably, in the charging device, the second end of the inductor L1 and the second end of the inductor L2 are electrically connected via a discharge ball; the second end of the inductor L3 and the second end of the inductor L5 are electrically connected via a discharge ball; and the second end of the inductor L4 and the second end of the inductor L7 are electrically connected via a discharge ball.

[0012] Preferably, the grounding device is made of welded steel plates arranged in a sand pit, wherein the resistivity of the buried sand is 100 ohm-cm.

[0013] Beneficial effects of the present invention: A movable lightning simulation impact test device is designed, which consists of an operating table, a control box and a generator body. The device can intelligently control the generated voltage and current and the ball gap distance of the generator body. The test operation is very simple and convenient, and lightning characteristic related tests can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the movable lightning simulation impact test device of the present invention.

[0015] Figure 2 It is a voltage waveform diagram when performing an impact test of the present invention.

[0016] Figure 3 This is a current waveform diagram when performing an impact test of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Example: Figure 1 As shown, the portable lightning simulation impulse test device is composed of a console, a control box and a lightning generator body. The lightning generator body includes a first isolation transformer, a second isolation transformer, a third isolation transformer, a digital oscilloscope, a shunt, a rectifier, a charging device, a plurality of discharge balls, an impulse voltage divider and a grounding device. The controller is electrically connected to the control box, and the power supply supplies power to the control box through the first isolation transformer. The control box is connected to the input end of the rectifier through the third isolation transformer, the output end of the rectifier is electrically connected to the input end of the charging device, the output end of the charging device is used as the input end of the impulse voltage divider, and the output end of the impulse voltage divider is connected to the grounding device through the discharge ball. One end of the shunt is electrically connected to the input end of the rectifier, the other end of the shunt is electrically connected to the first output end of the digital oscilloscope, the second output end of the digital oscilloscope is electrically connected to the impulse voltage divider, and the input end of the digital oscilloscope is electrically connected to the output end of the second isolation transformer; the impulse current is set as a standard lightning current waveform in the console, and the impulse current amplitude is adjusted through the control box; the ball gap between the discharge balls is adjusted through the console.

[0019] In this embodiment, the test device includes an operating table, a control box, an impulse high current generator and an artificial sand pit. It is a set of movable impulse high voltage and high current generator test equipment that can simulate lightning impulse waves. It can intelligently control the generated voltage and current and the ball gap distance of the generator body, and the test operation is very simple; the grounding device is welded by steel plates set in the sand pit, and the resistivity of the buried sand is 100 ohms.cm; the control box and the corresponding control circuit are powered by an isolation transformer, and the impulse current waveform into the ground and the impulse voltage waveform on the centralized grounding device are measured respectively; the lightning impulse characteristic test can be carried out, the impulse voltage and current waveforms under different conditions are recorded, and the impulse grounding resistance is calculated. In the test, an impulse voltage divider and a shunt are used to measure the voltage and current respectively, and the test waveform is recorded by connecting a digital oscilloscope.

[0020] In the test, the impulse current is set to a standard lightning current waveform, and the impulse current amplitude is adjusted by a control box as a preferred method. The rectifier includes a diode D1, a diode D2 and a capacitor C1. The first end of the capacitor C1 is electrically connected to the first output end of the third isolation transformer, the second output end of the third isolation transformer is electrically connected to the anode end of the diode D1, and the cathode end of the diode D1 is electrically connected to the anode end of the diode D2 and the second end of the capacitor C1, respectively.

[0021] The charging device includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, an inductor L5, an inductor L6, an inductor L7, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5; a first end of the inductor L1 is electrically connected to a cathode end of a diode D2, a second end of the inductor L1 is electrically connected to a first end of the capacitor C2 and a first end of the inductor L3; a second end of the capacitor C2 is electrically connected to an anode end of a diode D1 and a first end of the inductor L2; a second end of the inductor L3 is electrically connected to a first end of the inductor L4 and a first end of the capacitor C3, a second end of the inductor L2 is electrically connected to a second end of the capacitor C3 and a first end of the inductor L5, a second end of the inductor L4 is electrically connected to a first end of the inductor L6 and a first end of the capacitor C4, The second end of the inductor L5 is electrically connected to the second end of the capacitor C4 and the first end of the inductor L7 respectively, the second end of the inductor L6 is electrically connected to the first end of the capacitor C5 and the discharge ball respectively; the second end of the inductor L7 is electrically connected to the second end of the capacitor C5 and one end of the impulse voltage divider respectively; the second end of the inductor L1 and the second end of the inductor L2 are electrically connected through the discharge ball; the second end of the inductor L3 and the second end of the inductor L5 are electrically connected through the discharge ball; the second end of the inductor L4 and the second end of the inductor L7 are electrically connected through the discharge ball.

[0022] When the test device described in this embodiment is used to perform a lightning impulse test, the impulse test conditions are controlled as follows:

[0023] It was ensured that the total length of the grounding electrode in each group of tests was roughly equal, and the surface area of ​​the grounding electrode in contact with the soil was roughly equal. The buried depth of the grounding device model during the test was 10 cm. Without loss of generality, 6 typical impulse current amplitudes were selected from small to large in the console. In the test, a digital oscilloscope was used to record the waveforms of the impulse current and impulse voltage under different grounding devices, read the peak values ​​of the impulse voltage and impulse current, and calculate the impulse grounding resistance of the simulated grounding device. The test results took the average value of 3 tests as the final test results. In order to reduce the test error, the device was discharged after each test to ensure that the soil medium properties returned to normal.

[0024] At present, there is no unified standard for the waveform of impulse current in impulse tests. In research, 2.6 / 50μs, 8 / 20μs, etc. are generally used as actual lightning current waveforms. According to the principle of simulation test, in order to meet the requirements of simulation test, it is necessary to reduce the impulse current wave head time according to the scale. The scale is 10-20, and the wave head time required in the test is 0.13μs-0.8μs. It is necessary to reduce the current wave head time in simulation test. The wave head time can be reduced by reducing the inductance of the impulse generator in the test. However, due to the limitation of conditions, the reduction degree of the inductance of the test circuit is limited, which makes it difficult to reduce the current wave head time. In the test, the voltage adjustment waveform wave head time is 0.3μs, and the current waveform wave head time is generally controlled at about 2.6μs. Although there is a certain error, the test is carried out under this test condition to study the impulse dissipation characteristics of the grounding device, which has a certain reference significance for the research of new methods of impulse resistance reduction of the grounding device. The typical impulse current waveform during the test is shown in Figure 2 As shown, the voltage waveform is Figure 3 shown.

[0025] The specific implementation described above is a preferred implementation of the movable lightning simulation impact test device of the present invention, and is not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation. All equivalent changes made in accordance with the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. A portable lightning simulation impact test device, characterized in that: The invention comprises a control console, a control box and a lightning generator body, wherein the lightning generator body comprises a first isolation transformer, a second isolation transformer, a third isolation transformer, a digital oscilloscope, a shunt, a rectifier, a charging device, a plurality of discharge balls, an impulse voltage divider and a grounding device, wherein the first isolation transformer is electrically connected to the control box, and the power supply supplies power to the control box through the first isolation transformer, the control box is connected to the input end of the rectifier through the third isolation transformer, the output end of the rectifier is electrically connected to the input end of the charging device, the output end of the charging device is used as the input end of the impulse voltage divider, the output end of the impulse voltage divider is connected to the grounding device through the discharge ball, one end of the shunt is electrically connected to the input end of the rectifier, the other end of the shunt is electrically connected to the first output end of the digital oscilloscope, the second output end of the digital oscilloscope is electrically connected to the impulse voltage divider, and the input end of the digital oscilloscope is electrically connected to the output end of the second isolation transformer; the impulse current is set as a standard lightning current waveform in the control console, and the impulse current amplitude is adjusted through the control box; the ball gap between the discharge balls is adjusted through the control console; The rectifier device includes a diode D1, a diode D2 and a capacitor C1, the first end of the capacitor C1 is electrically connected to the first output end of the third isolation transformer, the second output end of the third isolation transformer is electrically connected to the anode end of the diode D1, and the cathode end of the diode D1 is electrically connected to the anode end of the diode D2 and the second end of the capacitor C1 respectively; The charging device includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, an inductor L5, an inductor L6, an inductor L7, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5; a first end of the inductor L1 is electrically connected to a cathode end of a diode D2, The second end of the inductor L1 is electrically connected to the first end of the capacitor C2 and the first end of the inductor L3 respectively; the second end of the capacitor C2 is electrically connected to the anode end of the diode D1 and the first end of the inductor L2 respectively; the second end of the inductor L3 is electrically connected to the first end of the inductor L4 and the first end of the capacitor C3 respectively, the second end of the inductor L2 is electrically connected to the second end of the capacitor C3 and the first end of the inductor L5 respectively, the second end of the inductor L4 is electrically connected to the first end of the inductor L6 and the first end of the capacitor C4 respectively, the second end of the inductor L5 is electrically connected to the second end of the capacitor C4 and the first end of the inductor L7 respectively, the second end of the inductor L6 is electrically connected to the first end of the capacitor C5 and the discharge ball respectively; the second end of the inductor L7 is electrically connected to the second end of the capacitor C5 and one end of the impulse voltage divider respectively; In the charging device, the second end of the inductor L1 is electrically connected to the second end of the inductor L2 through a discharge ball; the second end of the inductor L3 is electrically connected to the second end of the inductor L5 through a discharge ball; the second end of the inductor L4 is electrically connected to the second end of the inductor L7 through a discharge ball.

2. The portable lightning simulation impact test device according to claim 1 is characterized in that: The grounding device is made of welded steel plates arranged in a sand pit, wherein the resistivity of the buried sand is 100 ohm-cm.

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