Lightning arrester residual voltage test device and control method

Abstract

The invention belongs to the technical field of lightning arrester residual voltage tests, and discloses a lightning arrester residual voltage test device and a control method, and the device comprises an intelligent switch control system, an intelligent test measurement and control system, and a test object transfer and wiring system. The intelligent switch control system comprises a plurality of programmable controllers; the sample transferring and wiring system comprises a plurality of mechanical arms; the test wiring device comprises a test upper electrode and an air cylinder which are arranged above the test object mounting station and are electrically connected with each other, and a grounding switch which is arranged below the test object mounting station and is connected with an equipment grounding end; the test voltage and test current measurement and control system and the grounding switch are electrically connected with the programmable controller. The test equipment and the test object can be automatically and rapidly switched, the test equipment charging voltage required by the expected impact current amplitude is rapidly determined according to a historical test database or a pre-test result, and the influence or damage of repeated adjustment of the charging voltage on the original characteristics of the test object is reduced to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of residual voltage test of lightning arresters, and in particular relates to a device and a control method for residual voltage test of lightning arresters. Background Art

[0002] At present, the traditional residual voltage test method of lightning arrester adopts manual installation of test products and connection of corresponding wires, which is inefficient and has the risk of wrong wiring and electric shock; it completely relies on the experience of test personnel to charge the test equipment, and often requires multiple charging and discharging processes to obtain the required impulse current amplitude; multiple current shocks to the same test product will cause severe heating of the test product, and even if it is cooled to ambient temperature, the characteristic parameters of the test product will change irreversibly; excessive charging voltage may even cause damage to the test product. Therefore, in order not to affect its original characteristics, the test product needs to be cooled to ambient temperature and placed for a period of time after each shock, resulting in poor test accuracy, long cycle and low efficiency.

[0003] The Chinese patent publication number is CN101598757A, and the name is a patent application for a residual voltage test circuit and method for a controllable metal oxide arrester. The test circuit includes: an impulse current generating device, which generates an operating impulse current and / or a lightning impulse current, and provides a high-voltage output terminal and a low-voltage output terminal; a wave modulation capacitor, which is connected in parallel with the controllable arrester test piece between the high-voltage output terminal and the low-voltage output terminal; a voltage divider, one end of which is connected to the high-voltage output terminal of the impulse current generating device, and the other end is grounded; a Rogowski coil, which is directly sleeved on the conductor of the controllable arrester test piece branch; a waveform recorder, which is connected to the output end of the voltage divider and the Rogowski coil, and is used to record the voltage and current waveforms of the controllable arrester test piece. This patent application cannot achieve rapid switching of test equipment and test pieces, and cannot quickly determine the charging voltage of the test equipment required for the expected impulse current amplitude. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a device and control method for residual voltage test of lightning arrester, which can realize automatic and rapid switching of test equipment and test products, and quickly determine the charging voltage of the test equipment required for the expected impact current amplitude based on the historical test database or the results of the preliminary test, so as to minimize the influence or damage of repeated adjustment of the charging voltage on the original characteristics of the test product, and improve the scientificity and accuracy of the test. Through the intelligent test measurement and control system, the residual voltage test items and the corresponding test product numbers can be pre-selected, and the charging voltage required for the test equipment under the expected impact current amplitude can be quickly determined; through the programmable controller and the intelligent switch control system to communicate, the automatic conversion of the test equipment and the test station is completed, and the automatic construction of the test loop is realized.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In the first aspect, the present invention provides a device for residual voltage testing of lightning arresters, comprising: an intelligent switch control system, an intelligent test measurement and control system, and a sample transfer and wiring system; the intelligent switch control system comprises a plurality of programmable controllers; the intelligent test measurement and control system comprises a test large database and a test voltage and test current measurement and control system that are interconnected and communicate with each other; the sample transfer and wiring system comprises a plurality of mechanical arms, and a sample transmission turntable is arranged next to the mechanical arms; the sample transmission turntable has a sample installation station; a test wiring device is arranged next to the sample installation station, and the test wiring device comprises a test upper electrode and a cylinder that are arranged above the sample installation station and are electrically connected to each other, and a grounding switch that is arranged below the sample installation station and is connected to the grounding terminal of the equipment, and the test upper electrode is connected to the high-voltage output terminal of the equipment; the test voltage and test current measurement and control system, the test upper electrode and the grounding switch are all electrically connected to the residual voltage test circuit; the test voltage and test current measurement and control system and the grounding switch are all electrically connected to the programmable controller.

[0006] Optionally, a test completion area and a spare parts area are provided next to the robotic arm.

[0007] Optionally, the number of the robotic arms is greater than one, each robotic arm has a sample transmission turntable, and a conveyor belt is arranged between the multiple sample transmission turntables.

[0008] Optionally, the residual voltage test circuit has a voltage regulator and a transformer; the test voltage and test current measurement and control system includes a charging voltage monitoring instrument and a current sensor for monitoring the test current, the charging voltage monitoring instrument is connected in parallel with the high voltage or low voltage output terminal of the transformer, and the current sensor for monitoring the test current is connected in series in the residual voltage test circuit.

[0009] Optionally, the test voltage and test current measurement and control system further includes a digital oscilloscope for signal acquisition, and the charging voltage monitoring instrument and the current sensor for test product current monitoring are both connected to the digital oscilloscope for signal acquisition via cables.

[0010] Optionally, the voltage regulator and the transformer are both connected in series in a residual voltage test circuit, and the voltage regulator is connected in series with a voltage regulator switch and the transformer is connected in series with a transformer switch, and the voltage regulator switch and the transformer switch are both electrically connected to an intelligent switch control system.

[0011] Optionally, a wave modulation element is connected in series in the residual voltage test circuit.

[0012] Optionally, the number of residual voltage test circuits is greater than one, each residual voltage test circuit is connected to a programmable controller, each programmable controller is connected to a switch cabinet, and each programmable controller is connected to a common master programmable controller.

[0013] In a second aspect, the present invention provides a control method for a lightning arrester residual voltage test device, comprising the following steps: Select the test items in the intelligent test measurement and control system, input the test parameters and characteristic parameters of the test product; select the corresponding test equipment according to the test items selected by the intelligent test measurement and control system through the intelligent switch control system; Through the voltage and current measurement and control system, according to the test parameters and test product characteristic parameters input by the intelligent test measurement and control system, the historical test data is retrieved in the database; After the test sample is sent to the test sample installation station through the robotic arm and the test sample transfer turntable, the high-voltage output terminal of the equipment is connected to the high-voltage terminal of the test sample through the test wiring device, and the grounding terminal of the residual voltage circuit is connected to the high and low voltage terminals of the test sample; The intelligent switch control system controls the closing of the grounding switch through a programmable controller; then the test product at the test product installation station is tested according to the determined test parameters and test product characteristic parameter values.

[0014] Optionally, when searching for historical test data in the database, when matching historical test data with the same parameters or meeting the error requirements, the retrieved matching charging voltage is used as the device charging voltage; when no matching historical test data with the same parameters or meeting the error requirements is found, the voltage is selected. Uc 1 is used as the device charging voltage for preliminary experiments, and the local linear principle formula is used Uc 1 / I 1 = Uc 2 / I Calculate the new charging voltage Uc 2 as the device charging voltage, where I is the expected impulse current amplitude, I 1 is the current amplitude measured in the preliminary experiment.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a lightning arrester residual pressure test device and control method. Through the intelligent test device, the test equipment can be automatically switched according to the test items selected by the system, and the corresponding switches can be automatically closed or opened according to the preset test process, which can effectively reduce erroneous operations.

[0016] The sample transfer and wiring system of the present invention utilizes the cooperation of a robotic arm and a sample transfer turntable to automatically complete the delivery of the sample into or out of the sample installation station; according to the test progress, the connection or disconnection between the high-voltage output terminal of the equipment and the sample is automatically completed, thereby minimizing the labor intensity of test personnel repeatedly entering the test area to replace the sample, eliminating the risk of electric shock for test personnel when connecting or disconnecting wiring when replacing the sample, thereby reducing the opening and voltage reduction operations of the test equipment, and effectively improving the test efficiency.

[0017] The historical test big database of the present invention can quickly obtain the equipment charging voltage required for the test more accurately, avoiding the risk of accidental damage to the test product and equipment caused by blind or experience-based charging, minimizing the impact of repeated debugging on the original characteristics of the test product, and effectively improving the accuracy of the equipment charging voltage and the credibility of the test data.

[0018] The present invention can realize the simultaneous operation or sequential operation of multiple devices; can automatically collect and store corresponding test data and form formatted test records according to user definitions, thereby realizing one-button fully automated testing of multiple devices and multiple workstations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 It is the overall framework diagram of the device of the present invention; Figure 2 This is a control diagram of the sample transport process of the present invention; Figure 3 A diagram of a method for determining the charging voltage of the device of the present invention; Figure 4 This is a control principle diagram of the intelligent switch control system of the present invention; Figure 5 This is a control flow chart of a single set of residual pressure equipment test of the present invention; Figure 6 This is a control flow chart of the three sets of residual pressure equipment test of the present invention; Among them, 1. Robotic arm; 11. First robot arm; 12. Second robot arm; 13. Third robot arm; 2. Conveyor belt; 21. First conveyor belt; 22. Second conveyor belt; 3. Sample transfer turntable; 31. Sample installation station; 32. Sample pre-placement station; 33. Sample position after test; 301. First sample transfer turntable; 302. Second sample transfer turntable; 303. Third sample transfer turntable; 4. Spare parts area; 41. First spare parts area; 42. Second spare parts area; 43. Third spare parts area; 5. Test completion area; 51. First test completion area ; 52, second test completion area; 53, third test completion area; A0, intelligent switch control system; A011, first switch cabinet; A012, second switch cabinet; A013, third switch cabinet; A021, first programmable controller; A022, second programmable controller; A023, third programmable controller; A020, main programmable controller; C01, first residual voltage test circuit; C02, second residual voltage test circuit; C03, third residual voltage test circuit; E, power supply; E1, voltage regulator; E2, transformer; E3, wave modulation element. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions 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.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] When an element is referred to as being "disposed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a central element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiments. If the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but it can be slightly tilted.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In the description of the present invention, it is understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms of "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0026] The present invention is described in detail below with reference to the accompanying drawings.

[0027] A lightning arrester residual voltage test device of the present invention comprises: an intelligent switch control system A0, an intelligent test measurement and control system, and a sample transport and wiring system; the intelligent switch control system A0 comprises a plurality of programmable controllers; the intelligent test measurement and control system comprises a test large database and a test voltage and test current measurement and control system which are mutually communicated; the sample transport and wiring system comprises a plurality of mechanical arms 1, and a sample transmission turntable 3 is arranged beside the mechanical arms 1; a sample installation station 31 is provided on the sample transmission turntable 3; a test wiring device is arranged beside the sample installation station 31, and the test wiring device comprises a test upper electrode and a cylinder which are arranged above the sample installation station 31 and are electrically connected to each other, and a grounding switch which is arranged below the sample installation station 31 and is connected to the grounding terminal of the equipment, and the test upper electrode is connected to the high-voltage output terminal of the equipment; the test voltage and test current measurement and control system, the test upper electrode and the grounding switch are all electrically connected to the residual voltage test circuit; the test voltage and test current measurement and control system and the grounding switch are all electrically connected to the programmable controller.

[0028] Optionally, the test piece is a resistor or a lightning arrester.

[0029] A lightning arrester residual pressure test device of the present invention, when used, comprises the following steps: Select the test item in the intelligent test measurement and control system, input the test parameters and the characteristic parameters of the test product; select the corresponding test equipment according to the test item selected by the intelligent test measurement and control system through the intelligent switch control system A0; Through the voltage and current measurement and control system, according to the test parameters and test product characteristic parameters input by the intelligent test measurement and control system, the historical test data is retrieved in the database; After the test sample is sent to the test sample installation station 31 through the mechanical arm 1 and the test sample transfer turntable 3, the high-voltage output terminal of the equipment is connected to the high-voltage terminal of the test sample through the test wiring device, and the grounding terminal of the residual voltage circuit is connected to the high and low voltage terminals of the test sample; The intelligent switch control system A0 controls the grounding switch to close through the programmable controller; and then tests the test product at the test product installation station 31 according to the determined test parameters and test product characteristic parameter values.

[0030] Among them, lightning arrester: an electrical device used to protect electrical equipment from high transient overvoltage hazards and limit the follow-up time and often the follow-up amplitude. The lightning arrester is connected between the grid conductor and the ground wire, and sometimes also connected next to the electrical module or between the conductors. Lightning arrester is sometimes also called overvoltage protector, overvoltage limiter.

[0031] Zinc oxide resistor: A cake-shaped product made of zinc oxide powder as the main material, with bismuth oxide, antimony oxide and other auxiliary materials added through processes such as full mixing, spray granulation, drying, pressing, debinding, and high-temperature sintering.

[0032] Zinc oxide resistors have excellent nonlinear resistance characteristics and can quickly limit overvoltage to a lower level. They are the core components of lightning arresters.

[0033] Residual voltage: The peak voltage between the terminals of a lightning arrester when the discharge current flows through it.

[0034] The purpose of measuring residual voltage is to obtain the maximum residual voltage of a given design under various specified currents and waveforms. The residual voltage of the arrester includes the residual voltage value under steep wave, lightning, and switching impulse current waveforms.

[0035] Voltage ratio: the ratio of the residual voltage of the arrester to its reference voltage.

[0036] Under different current waveforms and current amplitudes, the voltage ratio of the arrester is different. Under the same current waveform, within a certain current amplitude, the residual voltage of the arrester is close to linear with the current amplitude.

[0037] Reference voltage: A general term for power frequency reference voltage and DC reference voltage. Power frequency reference voltage refers to the peak value of the power frequency voltage between the arrester terminals measured when the power frequency reference current flows through the arrester divided by; DC reference voltage refers to the average value of the DC voltage between the arrester terminals measured when the DC reference current flows through the arrester (if the voltage is related to polarity, take the lower value).

[0038] Reference current: A general term for power frequency reference current and DC reference current. Power frequency reference current refers to the peak value of the power frequency current resistive component used to determine the power frequency reference voltage of the arrester (if the current is asymmetric, take the higher peak value of the two polarities); DC reference current refers to the average value of the DC current used to determine the DC reference voltage of the arrester.

[0039] The residual voltage test is an important part of the arrester test. Through the residual voltage test, the maximum residual voltage of the arrester under various specified currents and waveforms can be obtained, thereby determining the protection level of the arrester.

[0040] Lightning arresters can effectively suppress lightning overvoltages caused by lightning strikes on transmission lines or power equipment, as well as power frequency or operating transient overvoltages generated when switching on and off large loads. They are one of the important protective electrical appliances for power equipment in transmission and transformation lines.

[0041] In the residual voltage test of lightning arresters or zinc oxide resistors for lightning arresters, an impulse current generator is used to provide an impulse current of a specified waveform. Since the zinc oxide resistors for lightning arresters or lightning arresters have nonlinear properties, the characteristics (such as potential gradient, pressure ratio, etc.) of zinc oxide resistors of different specifications, different formulas, and different manufacturers are quite different. There is a relatively complex relationship between the voltage U on the test piece and the current I flowing through the test piece. It is difficult to determine the charging voltage of the impulse current generator required for the expected impulse current amplitude. Usually, when testing under a certain impulse current waveform, in order to obtain the expected impulse current amplitude, the test personnel often need to repeatedly adjust the charging voltage of the test equipment and apply multiple current impulses to the same test piece. However, due to the large impulse current amplitude, the thermal stress, electrical stress and cumulative effect generated by multiple current impulses will affect the original characteristics of the test piece, and even cause damage to the test piece in severe cases; therefore, in order to reduce this adverse effect, the test piece usually needs to be cooled to ambient temperature for a period of time after each impulse, which results in a longer test cycle.

[0042] The residual voltage test includes three types of residual voltage under specified impulse current waveforms. The traditional test method relies on test personnel to select test equipment, replace test items, and disconnect test wires. The test efficiency is low, there are many safety hazards, and the test is not intelligent.

[0043] The intelligent test device of the present invention can automatically switch the test equipment according to the test items selected by the system, and control the corresponding switches to automatically close or open according to the preset test process, which can effectively reduce erroneous operations.

[0044] The sample transfer and wiring system of the present invention utilizes the cooperation between the robot arm 1 and the sample transfer turntable 3 to automatically complete the delivery of the sample into or out of the sample installation station 31; according to the test progress, the connection or disconnection between the high-voltage output terminal of the equipment and the sample is automatically completed, which minimizes the labor intensity of the test personnel repeatedly entering the test area to replace the sample, eliminates the risk of electric shock to the test personnel when connecting or disconnecting the wiring when replacing the sample, and thus reduces the opening and voltage reduction operations of the test equipment, effectively improving the test efficiency.

[0045] The historical test database can quickly obtain the equipment charging voltage required for the test with high accuracy, avoiding the risk of accidental damage to the test product and equipment due to blind or experience-based charging, minimizing the impact of repeated debugging on the original characteristics of the test product, and effectively improving the accuracy of the equipment charging voltage and the credibility of the test data.

[0046] Example 1 like Figure 1 As shown, a lightning arrester residual voltage test device of this embodiment includes: an intelligent switch control system A0, an intelligent test measurement and control system, and a test sample transportation and wiring system.

[0047] The intelligent test measurement and control system comprises a test big database and a test voltage and test current measurement and control system which are interconnected and communicated with each other.

[0048] like Figure 2 As shown, in this embodiment, the number of the robotic arms 1 of the sample transfer and wiring system is three, namely the first robotic arm 11, the second robotic arm 12 and the third robotic arm 13. The first robotic arm 11 is provided with the first spare product area 41, the first test completion area 51 and the first sample transmission turntable 301; the second robotic arm 12 is provided with the second test completion area 52, the second spare product area 42 and the second sample transmission turntable 302; the third robotic arm 13 is provided with the third test completion area 53, the third spare product area 43 and the third sample transmission turntable 303.

[0049] The sample transmission turntable 3 has a sample installation station 31, a sample pre-placement station 32 and a test completion sample station 33. Specifically, the sample installation station 31 is used to test the sample at this station; the sample pre-placement station 32 is a sample pre-placement station on the sample transmission turntable 3 of the residual pressure test equipment; the sample at the test completion sample station 33 waits for the robot arm 1 to suck it onto the conveyor belt 2 according to a predetermined instruction to prepare for the next test or directly suck it into the test completion area 5 to end the test.

[0050] A first conveyor belt 21 is provided between the first sample transmission turntable 301 and the second sample transmission turntable 302; a second conveyor belt 22 is provided between the second sample transmission turntable 302 and the third sample transmission turntable 303. A test wiring device is provided next to the sample installation station 31, and the test wiring device includes a test upper electrode and a cylinder which are provided above the sample installation station 31 and are electrically connected to each other, and a grounding switch which is provided below the sample installation station 31 and is connected to the grounding terminal of the equipment. The test upper electrode is connected to the high-voltage output terminal of the equipment.

[0051] The residual voltage test circuit comprises a voltage regulator, a transformer and an ignition discharge spherical gap. The ignition discharge spherical gap is connected in series with the test upper electrode. The test voltage and test current measurement and control system, the test upper electrode, the grounding switch and the ignition discharge spherical gap are all electrically connected to a programmable controller.

[0052] A sample transport and wiring system of the present invention, when used, completes the test in the following order: The first robot arm 11 sucks the samples stacked in the first product area 41 and places them on the sample pre-placement position 32 through a suction cup.

[0053] The sample transmission turntable 3 is rotated to send the sample to the sample installation station 31 of the first sample transmission turntable 301; and then the test step is performed.

[0054] The test steps include: after the test wiring device automatically completes the connection between the high-voltage output terminal of the equipment and the test product, the test product enters a waiting state.

[0055] After the residual voltage test equipment completes equipment closing, charging, discharging, data collection and storage according to the preset program, the test wiring device automatically disconnects the high-voltage output terminal of the equipment from the test product. The test product transmission turntable 3 is rotated to send the test product to the test completion test product position 33.

[0056] Then, the first robot arm 11 is controlled to suck the sample that has completed the test from the finished sample position 33 and place it on the first conveyor belt 21 to prepare for the next test or directly suck it and place it in the first finished test area 51 to end the test of the sample.

[0057] The first robot arm 11 is controlled to perform the test steps on all the new samples stacked in the first spare product area 41 until all the samples in the first spare product area 41 have completed the test.

[0058] The second robot arm 12 sucks the sample conveyed by the first conveyor belt 21 through the suction cup and places it on the sample pre-placement position 32 of the second sample transfer turntable 302 of the second set of residual pressure testing equipment.

[0059] When the first conveyor belt 21 has no samples to convey, the second robot arm 12 sucks the samples stacked in the second spare product area 42 through the suction cup and places them on the sample pre-placement position 32 of the second sample transfer turntable 302 of the second set of residual pressure testing equipment.

[0060] The sample transmission turntable 3 is rotated to send the samples on the second sample transmission turntable 302 from the sample pre-placement position 32 to the sample installation position 31 of the second sample transmission turntable 302 .

[0061] The test steps are repeated until the second set of residual pressure test equipment completes the test of all the samples conveyed by the first conveyor belt 21 and the second spare parts area 42.

[0062] When the sample that has completed the test of the first set of residual pressure testing equipment does not need to be tested by the second set of residual pressure testing equipment, but needs to be tested by the third set of residual pressure testing equipment, the second robot arm 12 places the sample conveyed by the first conveyor belt 21 directly on the second conveyor belt 22.

[0063] The test steps are repeated until the third set of residual pressure test equipment completes the test of all the samples conveyed by the second conveyor belt 22 and the third spare parts area 43.

[0064] The test wiring device is connected to the test voltage and test current measurement and control system, and the test voltage and test current measurement and control system is connected to the residual voltage test circuit. The test voltage and test current measurement and control system includes a charging voltage monitoring instrument, a current sensor for monitoring the test product current, and a digital oscilloscope for signal acquisition.

[0065] In this embodiment, the first set of residual voltage test equipment includes a first residual voltage test circuit C01, the second set of residual voltage test equipment includes a second residual voltage test circuit C02, and the third set of residual voltage test equipment includes a third residual voltage test circuit C03. The first residual voltage test circuit C01, the second residual voltage test circuit C02, and the third residual voltage test circuit C03 all have a power supply E, and the power supply E is connected in series with a voltage regulator E1, a transformer E2, and a wave modulation element E3. Optionally, the wave modulation element E3 is a resistor, a capacitor, or an inductor.

[0066] The first residual pressure test circuit C01, the second residual pressure test circuit C02 and the third residual pressure test circuit C03 respectively carry out residual pressure test items with different specified waveforms.

[0067] In the first residual voltage test circuit C01, the power source E is connected in series with the first power switch K11, the first voltage regulator switch K12, and the first transformer switch K13; the test current measurement and control system in the first residual voltage test circuit C01 includes the first charging voltage monitoring instrument VT1, the current sensor CT1 for sample current monitoring, and the digital oscilloscope AS1 for signal acquisition; in the first residual voltage test circuit C01, the first sample W11 is placed on the sample installation station 31, and the cylinder above the sample installation station 31 is connected in series with the first ignition discharge spherical gap G1 and the cylinder is connected to the first grounding switch D11. In the first residual voltage test circuit C01: the first power switch K11, the first voltage regulator switch K12, the first transformer switch K13, the test current measurement and control system, the first ignition discharge spherical gap G1, the cylinder and the first grounding switch D11 are all connected to a common first switch cabinet A011, and the first switch cabinet A011 is connected to the first programmable controller A021.

[0068] In the second residual voltage test circuit C02, the power source E is connected in series with the second power switch K21, the second voltage regulator switch K22, and the second transformer switch K23; the test current measurement and control system in the second residual voltage test circuit C02 includes a second charging voltage monitoring instrument VT2, a current sensor CT2 for monitoring the test current, and a digital oscilloscope AS2 for signal acquisition; in the second residual voltage test circuit C02, a second test product W21 is placed on the test product installation station 31, and the cylinder above the test product installation station 31 is connected in series with the second ignition discharge spherical gap G1 and the cylinder is connected to the second grounding switch D21. In the second residual voltage test circuit C02: the second power switch K21, the second voltage regulator switch K22, the second transformer switch K23, the test current measurement and control system, the second ignition discharge spherical gap G2, the cylinder and the second grounding switch D21 are all connected to a common second switch cabinet A012, and the second switch cabinet A012 is connected to the second programmable controller A022.

[0069] In the third residual voltage test circuit C03, the power source E is connected in series with the third power switch K31, the third voltage regulator switch K32, and the third transformer switch K33; the test current measurement and control system in the third residual voltage test circuit C03 includes a third charging voltage monitoring instrument VT3, a current sensor CT3 for sample current monitoring, and a digital oscilloscope AS3 for signal acquisition; in the third residual voltage test circuit C03, a third sample W31 is placed on the sample installation station 31, and the cylinder above the sample installation station 31 is connected in series with the third ignition discharge spherical gap G3 and the cylinder is connected to the third grounding switch D31. In the third residual voltage test circuit C03: the third power switch K31, the third voltage regulator switch K32, the third transformer switch K33, the test current measurement and control system, the third ignition discharge spherical gap G2, the cylinder and the third grounding switch D31 are all connected to a common third switch cabinet A013, and the third switch cabinet A013 is connected to the third programmable controller A023.

[0070] The first programmable controller A021, the second programmable controller A022 and the third programmable controller A023 are all connected to a common master programmable controller A020.

[0071] The test voltage and test current measurement and control system is based on the preset test items and expected impact current amplitude. I The test parameters are matched in the test database. If the matched historical data is the same or meets the error requirements, the charging voltage is set accordingly. Uc 1Apply a current shock to the test object.

[0072] The first test current is obtained by measuring the test voltage and test current measurement and control system I1 .

[0073] Compare the first test current I 1 and expected current I When the error does not exceed the allowable range, the test of the sample is completed, the test data is automatically stored according to the preset path, and the test record is formed according to the preset format.

[0074] If it exceeds the allowable range, according to the local linear principle ( Uc 1 / I 1 = Uc 2 / I） Calculate the new charging voltage Uc 2. Apply a current shock to the test sample at this charging voltage.

[0075] The second test current is obtained by measuring the test voltage and test current measurement and control system I2 .

[0076] Compare the second test current I2 With expected current I The error can be determined by terminating the test of the sample based on the comparison result or continuing to calculate a new charging voltage according to the local linear principle for testing until the error requirement is met.

[0077] Automatically store test data according to the preset path and form test records according to the preset format.

[0078] After the test product enters the test product installation station 31, the connection between the high-voltage output terminal of the equipment and the test product is completed through the test wiring device, the grounding control switch is closed, and then the system power supply, voltage regulator and transformer of the equipment are closed in sequence; the equipment starts to charge according to the estimated charging voltage, and after charging is completed, the ignition discharge ball gap G ignites and discharges, the circuit is connected, and the current impact on the test product is completed.

[0079] Among them, the intelligent switch control system A0 is responsible for automatically selecting the corresponding test equipment according to the preset test items in the intelligent test measurement and control system; controlling the automatic closing or opening of the corresponding system power supply switch, the voltage regulator switch, the transformer switch and the grounding control switch according to the preset test process; Conduct the test according to the equipment charging voltage value output by the intelligent test measurement and control system.

[0080] The sample transfer and wiring system can control the robot arm 1 to cooperate with the conveyor belt 2 or the sample transmission turntable 3 to complete the sample delivery or withdrawal from the sample installation station 31; the test wiring device completes the connection or disconnection between the high-voltage output terminal of the equipment and the sample.

[0081] The data of the test database of the intelligent test control system is obtained from multiple channels (including public data sources and internal data sources), and then the collected data is sorted, analyzed, and integrated to ensure the accuracy and consistency of the data for subsequent analysis and use. Before conducting the impulse current related test, it can quickly obtain the charging voltage of the test equipment from the data of historical tests that are the same or meet the error requirements based on the electrical parameters of the test product (reference voltage or pressure ratio) and test parameters (including impulse current type, current amplitude specified value) of the test product, so as to avoid blind charging or conducting tests based on limited personal experience, which may cause accidental damage to the test product and equipment.

[0082] Specifically, according to the characteristics and requirements of arrester impulse current related tests, the test database sets two levels of search items: The keywords for setting the first-level search items are: test item name, test product specifications, test product parameters, impulse current waveform and impulse current amplitude.

[0083] In the secondary search items, the keywords for setting the test item name are: lightning residual voltage test, steep wave current test, operating residual voltage test and others; the keywords for setting the test product specifications are: test product diameter, test product height; the keywords for setting the test product parameters are: power frequency reference voltage, DC reference voltage, residual voltage; the keywords for setting the impulse current amplitude are: 250A, 100A, 5kA, 10kA, 20kA and others.

[0084] All search keywords are sorted and classified according to the corresponding relationship between the charging voltage of the corresponding test equipment (impact current generator) and the impulse current amplitude flowing through the test product after the test circuit is turned on. The data obtained from each test is automatically imported and stored in the database, and the database is regularly monitored, updated and maintained to ensure the stability and security of the database.

[0085] According to the sample parameters and test parameters, a more accurate search can be performed in the database according to the search keywords.

[0086] Specifically, the test voltage and current measurement and control system of the intelligent test measurement and control system is responsible for automatically searching and matching data in the database according to keywords such as the test project name, test product specifications and reference voltage, impulse current waveform and impulse current amplitude, and verifying, comparing and correcting the equipment charging voltage through preliminary tests; controlling the voltage boost or voltage reduction of the voltage regulator and the discharge of the ignition discharge ball gap in the test equipment through the intelligent switch control system; and reading the equipment charging voltage signal collected by the voltage monitoring instrument and the test product current signal collected by the current sensor from the digital oscilloscope in real time.

[0087] The present invention can automatically select test equipment according to the test items, and control the corresponding switches to automatically open or close in sequence according to the preset test process, effectively reducing misoperation; the precise coordination of the robot arm 1 of the present invention and the conveyor belt 2 or the sample transmission turntable 3 can realize the rapid transportation of the sample and the accurate entry or exit of the test station; the automatic connection or disconnection of the high-voltage output end of the equipment and the sample wiring eliminates the risk of electric shock caused by manual wiring replacement and improves the test efficiency. The present invention can eliminate accidental damage to the sample and equipment caused by blind charging or charging based on experience through the equipment charging voltage determined by the historical test big database and preliminary tests. The linkage of multiple sets of test equipment, the automation of test process and data processing of the present invention can minimize the impact of human factors on the test and realize the standardization and intelligence of the entire test process.

[0088] Example 2 A control method for an intelligent lightning arrester residual voltage test device comprises the following steps: Select the test item in the intelligent test control system and input the test parameters such as the expected impulse current amplitude. I and the characteristic parameters of the test sample, the test sample number or the reference voltage; The intelligent switch control system A0 automatically selects the corresponding test equipment according to the test items selected by the intelligent test measurement and control system; The voltage and current measurement and control system in the intelligent test measurement and control system retrieves historical test data from the database according to the test parameters and test product characteristic parameters input by the intelligent test measurement and control system.

[0089] The sample transfer and wiring system, through the cooperation of the mechanical arm 1 and the conveyor belt 2 or the sample transmission turntable 3, sends the sample into and positions it at the sample installation station 31, and then the test wiring device connects the high-voltage output terminal of the equipment with the sample; The intelligent switch control system A0 first controls the closing of the system power switch, the voltage regulator switch, the transformer switch and the grounding switch in sequence through the programmable controller according to the preset test process; then tests the test product at the test product installation station 31 according to the determined charging voltage value; After the test is completed, the test wiring device disconnects the test product from the high voltage output terminal of the equipment and removes it from the test product installation station 31; The intelligent switch control system A0 controls the grounding control switch and the transformer switch to open in sequence through a programmable controller; The voltage and current measurement and control system automatically stores the test data according to the preset path and forms the test record according to the preset format; Repeat the steps until all samples are tested and data processed.

[0090] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A lightning arrester residual pressure test device, characterized in that: include: An intelligent switch control system (A0), an intelligent test measurement and control system, and a sample transport and wiring system; the intelligent switch control system (A0) comprises a plurality of programmable controllers; the intelligent test measurement and control system comprises a test big database and a test voltage and test current measurement and control system which are mutually communicated; the sample transport and wiring system comprises a plurality of mechanical arms (1), a sample transmission turntable (3) is arranged beside the mechanical arms (1); a sample installation station (31) is arranged on the sample transmission turntable (3); a test wiring device is arranged beside the sample installation station (31), the test wiring device comprises a test upper electrode and a cylinder which are arranged above the sample installation station (31) and are electrically connected to each other, and a grounding switch which is arranged below the sample installation station (31) and is connected to the grounding terminal of the equipment, the test upper electrode being connected to the high-voltage output terminal of the equipment; the test voltage and test current measurement and control system, the test upper electrode, and the grounding switch are all electrically connected to the residual voltage test circuit; the test voltage and test current measurement and control system and the grounding switch are all electrically connected to the programmable controller.

2. A lightning arrester residual voltage test device according to claim 1, characterized in that: A test completion area (5) and a spare parts area (4) are arranged next to the mechanical arm (1).

3. A lightning arrester residual voltage test device according to claim 1, characterized in that: The number of the mechanical arms (1) is greater than one, each mechanical arm (1) has a sample transmission turntable (3), and a conveyor belt (2) is arranged between the plurality of sample transmission turntables (3).

4. A lightning arrester residual voltage test device according to claim 1, characterized in that: The residual voltage test circuit has a voltage regulator and a transformer; the test voltage and test current measurement and control system includes a charging voltage monitoring instrument and a current sensor for monitoring the test current. The charging voltage monitoring instrument is connected in parallel with the high voltage or low voltage output end of the transformer, and the current sensor for monitoring the test current is connected in series in the residual voltage test circuit.

5. A lightning arrester residual voltage test device according to claim 4, characterized in that: The test voltage and test current measurement and control system also includes a digital oscilloscope for signal acquisition, and the charging voltage monitoring instrument and the current sensor for test product current monitoring are both connected to the digital oscilloscope for signal acquisition through cables.

6. A lightning arrester residual voltage test device according to claim 4, characterized in that: The voltage regulator and the transformer are both connected in series in the residual voltage test circuit, and the voltage regulator is connected in series with a voltage regulator switch and the transformer is connected in series with a transformer switch. The voltage regulator switch and the transformer switch are both electrically connected to an intelligent switch control system (A0).

7. A lightning arrester residual voltage test device according to claim 1, characterized in that: A wave modulation element is connected in series in the residual pressure test circuit.

8. The device for residual voltage testing of a lightning arrester according to claim 1, characterized in that: The number of residual voltage test circuits is greater than one, each residual voltage test circuit is connected to a programmable controller, each programmable controller is connected to a switch cabinet, and each programmable controller is connected to a common master programmable controller.

9. A control method for a lightning arrester residual voltage test device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Select the test item in the intelligent test measurement and control system, input the test parameters and the characteristic parameters of the test product; select the corresponding test equipment according to the test item selected by the intelligent test measurement and control system through the intelligent switch control system (A0); Through the voltage and current measurement and control system, according to the test parameters and test product characteristic parameters input by the intelligent test measurement and control system, the historical test data is retrieved in the database; After the test piece is sent to the test piece installation station (31) by means of the mechanical arm (1) and the test piece transfer turntable (3), the high voltage output terminal of the equipment is connected to the high voltage terminal of the test piece by means of the test wiring device, and the ground terminal of the residual voltage circuit is connected to the high and low voltage terminals of the test piece; The intelligent switch control system (A0) controls the earthing switch to close through a programmable controller; and then tests the test piece at the test piece installation station (31) according to the determined test parameters and test piece characteristic parameter values.

10. A control method for a lightning arrester residual voltage test device according to claim 9, characterized in that: When searching for historical test data in the database, if the historical test data with the same parameters or meeting the error requirements is matched, the retrieved matching charging voltage is used as the device charging voltage; if the historical test data with the same parameters or meeting the error requirements is not matched, the voltage is selected. Uc 1 is used as the device charging voltage for preliminary experiments, and the local linear principle formula is used Uc 1 / I 1 = Uc 2 / I Calculate the new charging voltage Uc 2 as the device charging voltage, where I is the expected impulse current amplitude, I 1 is the current amplitude measured in the preliminary experiment.

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