Platform for testing influence of water drops on corona discharge on surface of insulator

Abstract

The utility model discloses a platform for testing the influence of water drops on corona discharge on the surface of an insulator, and belongs to the technical field of power systems. The test platform comprises a raining device, a pulse current measuring device and an image acquisition system; the raining device is used for spraying water to the insulator; the pulse current measuring device is used for measuring the pulse current peak value of the insulator when the raining device works; and the image acquisition system is used for shooting the process that the water drops sprayed by the raining device drop on the insulator. According to the utility model, the image acquisition system is used for recording the process that a water drop contacts the surface of the insulator, and the pulse current measuring device is used for measuring the corona pulse current to obtain one-to-one correspondence between the corona pulse current and the stress movement condition and the discharge form of the water drop; the stress movement condition and the discharge characteristic of the water drop in the whole process of dropping, attaching to the surface of the insulator and leaving the insulator are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of power systems, in particular to a test platform for the influence of water drops on corona discharge on the surface of an insulator. Background Art

[0002] In a complex natural environment, insulators need to face the test of various severe weather conditions, among which rain conditions are particularly common. When raindrops fall on the surface of the insulator shed, due to the presence of high field strength areas, corona discharge may be triggered. Corona discharge is a local discharge phenomenon that produces a faint blue halo on the surface of the insulator, accompanied by a "hissing" sound. Although this discharge phenomenon seems weak, its impact on the power system cannot be ignored.

[0003] First, corona discharge will lead to the loss of transmission energy. When the current passes through the insulator, part of the energy will be dissipated in the form of heat, which not only reduces the transmission efficiency, but also may cause the temperature of the insulator to rise, thereby accelerating its aging process. Secondly, severe corona discharge may also cause flashover accidents. When the electric field strength of the insulator exceeds the tolerance limit of the insulator, flashover will occur, causing a sudden increase in current, which may cause serious damage to the power system. This seemingly ordinary power equipment component actually carries the important mission of supporting and fixing the conductor. Whether its performance is stable or not is directly related to the safe operation of the power system. In addition, corona discharge will also cause electromagnetic environment problems such as radio interference and audible noise.

[0004] At present, the test on the effect of water droplets on corona discharge on the insulator surface under rain conditions is to use a pulse current measuring device to measure the pulse current or a UV imager to monitor the corona. It is impossible to capture the force movement and discharge characteristics of water droplets during the entire process of falling, adhering to the insulator surface and leaving the insulator, resulting in the inability to obtain the relationship between the falling of water droplets under rain conditions and the corona on the insulator surface. Utility Model Content

[0005] In view of the problem in the prior art that it is impossible to capture the force movement and discharge characteristics of water droplets during the entire process of water droplets falling, adhering to the surface of an insulator and leaving the insulator, the utility model provides a test platform for the effect of water droplets on corona discharge on the surface of an insulator. The process of water droplets contacting the surface of the insulator is recorded by an image acquisition system, and the pulse current measuring device measures the corona pulse current, so as to achieve a one-to-one correspondence between the corona pulse current and the force movement and discharge form of the water droplets, and obtain the force movement and discharge characteristics of the water droplets during the entire process of water droplets falling, adhering to the surface of an insulator and leaving the insulator.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0007] A test platform for the effect of water droplets on corona discharge on the surface of an insulator comprises a shower device, a pulse current measuring device and an image acquisition system; the shower device is used for spraying water on the insulator; the pulse current measuring device is used for measuring the peak value of the pulse current of the insulator when the shower device is working; and the image acquisition system is used for photographing the process of water droplets sprayed by the shower device falling on the insulator.

[0008] Optionally, the shower device includes a movable base, a spray device and a lifting system; the movable base is installed below the lifting system, and the spray device is arranged above the lifting system.

[0009] Optionally, the spray device includes a shower row and a spray head; the shower row is installed in the upper area of ​​the lifting device; and the spray head is installed on the shower row.

[0010] Optionally, the spray device is made of anti-corrosion material.

[0011] Optionally, an anti-rollover device is provided on the movable base.

[0012] Optionally, the shower device further comprises a tape reel rack; the tape reel rack is used to collect the water tape between the shower device and the water source.

[0013] Optionally, the image acquisition system includes a camera; the camera is used to take photos or videos of the process of water drops falling on the insulator.

[0014] Optionally, a collecting device is also included; the collecting device is used to trigger the pulse current measuring device and the image acquisition system to start working, and collect the working results generated by the pulse current measuring device and the image acquisition system.

[0015] Optionally, the collection device includes a computer; the computer is arranged between the pulse current measuring device and the image acquisition system.

[0016] Optionally, the insulator is connected in parallel with an industrial frequency voltage divider; the industrial frequency voltage divider is also connected to a high-voltage winding of an industrial frequency test transformer; and a protective resistor is provided between the industrial frequency voltage divider and the high-voltage winding of the industrial frequency test transformer.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model can control the shower angle and shower amount through the shower device, the image acquisition system records the movement of water droplets, the pulse current measuring device monitors the pulse current flowing through the insulator, and the image acquisition system and the pulse current measuring device are synchronously controlled to trigger, so as to realize the one-to-one correspondence between the corona pulse current and the force movement and discharge form of the water droplets under the camera, thereby forming a test platform for studying the influence of water droplets on the corona discharge on the surface of the insulator under shower conditions. According to the information collected by the utility model, a real shower environment can be simulated, and the size, speed and landing point of raindrops, as well as the electric field strength on the surface of the insulator can be precisely controlled. According to the influence of water droplets on the corona discharge on the surface of the insulator under shower conditions, the influence mechanism of water droplets on the corona discharge on the surface of the insulator is analyzed, and the safety and reliability of the power system can be improved in a targeted manner, and the electromagnetic environment can be improved. 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:

[0020] Figure 1 The utility model is a schematic diagram of the installation of a test platform for the effect of water droplets on corona discharge on the surface of an insulator.

[0021] In the figure, 1 is a rain shower device; 2 is a pulse current measuring device; 3 is a camera; 4 is a computer; 5 is an insulator; 6 is an industrial frequency voltage divider; 7 is a protective resistor; 8 is a high-voltage winding; and 9 is an industrial frequency test transformer. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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.

[0023] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may 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 be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in 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. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Glossary:

[0026] Insulator: An insulator is a device installed between conductors at different potentials or between conductors and grounded structures, which can withstand voltage and mechanical stress.

[0027] Corona discharge: Corona discharge is a local discharge phenomenon caused by a gas gap under the action of an extremely non-uniform electric field.

[0028] The utility model provides a test platform for the influence of water drops on corona discharge on the surface of an insulator, comprising a rain shower device 1, a pulse current measuring device 2, an image acquisition system and a collecting device.

[0029] like Figure 1 As shown, the shower device 1 is used to spray water on the insulator 5, the pulse current measuring device 2 is arranged on the line connecting the insulator 5, and is used to measure the peak value of the pulse current reaching the insulator 5 during the test, and the image acquisition system is used to photograph the process of water drops falling on the insulator 5. The pulse current measuring device 2 and the image acquisition system are both connected to the collection device.

[0030] The shower device 1 comprises a movable base, a spray device, a lifting system, a control system, a water hose and a hose reel and an anti-rollover device.

[0031] The movable base is provided with a lifting system, and a spray device is provided at the top of the lifting system. The spray device is connected to the water source through a water hose. The movable base is also provided with a hose reel. When the lifting mechanism rises, the hose rises with the lifting mechanism. When the lifting mechanism descends, the hose can be wound around the hose reel to prevent the excessively long hose from affecting the personal safety of the operators. At the same time, the hose can also be stored after the test operation is completed. The state of the spray device is controlled by the control system, and anti-rollover devices are provided around the movable base to protect the personal safety of the operators.

[0032] The movable base can enable the shower device 1 to move on the ground, and after moving to a designated position, the locking device in the movable base is opened to prevent the shower device 1 from moving during the showering process. A level or other level indicating device is also provided on the movable base to measure the horizontal position and vertical position of the movable base on the ground, and the staff adjusts the movable base according to the position information.

[0033] The spraying device includes a shower row and a nozzle. The width of the shower row is ≥2m, and the maximum shower distance is ≥10m. The nozzle is fixed on the shower row. The water outlet direction of a single nozzle can be adjusted in multiple directions. Each row of nozzles can be opened or closed independently. No atomization will occur when spraying at a distance of 10m at the maximum spraying power. The spray angle of the shower row can be adjusted within the range of 0 to 45°, and the angle of a single nozzle can be adjusted. The shower row and nozzle are treated with rust and corrosion prevention to extend their service life.

[0034] The rain conditions are as follows:

[0035]

[0036] The lifting system is electrically controlled, with the highest nozzle height ≥15m from the ground. The lifting device should be rigid enough to ensure that the spraying device does not shake when it is lifted to the highest position for spraying. There will be no shaking during use. The lifting system can be raised and lowered continuously, and the height is controllable. It also has an automatic locking function when parking.

[0037] When the lifting mechanism rises, the water hose rises along with the lifting mechanism, and when the lifting mechanism descends, the water hose can be wound around the hose reel rack by manually rotating the hose reel rack.

[0038] The control system is used to control the shower row angle, shower volume, monitor the operation of each component of the shower device 1, and record test parameters such as water temperature, conductivity, water outlet pressure, and remaining water volume. The control system is connected to the shower device 1 using optical fiber, which is convenient for operation in the control room.

[0039] The pulse current measuring device 2 is a high-potential pulse current measuring device, which can measure the peak value of the impulse current in the range of 0 to 1000A, the maximum steady-state sinusoidal current effective value > 4A, the available rise time ≤ 5ns, the low-frequency cut-off frequency ≤ 50Hz, the bandwidth 50Hz to 20MHz, the sampling rate ≥ 100MS / s, the storage depth ≥ 512MS, the sampling accuracy of 8 bits or more, and the level trigger; it can display the measured waveform, including the local horizontal and vertical magnification function of the waveform, display the current scale (vertical), time scale (horizontal), sampling rate and other information of the waveform, as well as the waveform peak, effective value, time reading and waveform image and waveform data storage and export functions, which can meet the needs of the test.

[0040] The image acquisition system includes a camera 3, which is a high-speed camera.

[0041] The maximum shooting rate of the camera 3 selected in the present invention is 1,000,000 frames per second, and the shortest shutter time is no more than 1μs; the trigger mode includes manual triggering and image triggering. In the image triggering mode, the shooting results can be automatically stored after each triggering and the triggering state can be entered to prepare for the next triggering; storage method: the image sequence is automatically stored in the machine after the shooting is completed; power supply: battery and external power supply; built-in storage: 64GB, and can be connected to an external storage device; lens interface: common lenses such as Nikon, Canon, Sony, etc.; data transmission interface: USB3.0; and includes accessories such as tripod, pan head, filter, etc.; shooting parameters can be set in the software, such as: frame rate, resolution, shutter speed, triggering method, etc., and the shot images can be read and stored.

[0042] The collecting device includes a computer 4, which is used to trigger the pulse current measuring device 2 and the image acquisition system to start working, and collect the data generated by the triggered pulse current measuring device 2 and the image acquisition system.

[0043] The shower device 1 showers the insulator and can control the shower angle and shower amount to provide shower conditions for the insulator; the camera 3 constantly records the force movement and discharge characteristics of water drops when they fall, adhere to and leave the insulator; the pulse current measuring device 2 constantly monitors the pulse current flowing through the insulator; the camera 3 and the pulse current measuring device 2 are synchronously controlled and triggered by the computer 4 in the collecting device to achieve a one-to-one correspondence between the corona pulse current and the force movement and discharge morphology of the water droplets under the camera 3, so as to study the influence of water droplets on the corona discharge on the insulator surface.

[0044] The utility model realizes the simulation of the corona discharge state on the surface of the insulator under various rain conditions through the rain shower device 1, and compares the result of photographing the state of raindrops falling on the insulator 5 with the measurement result obtained by the pulse current measuring device 2 through the pulse current measuring device 2 through the pulse current measuring system, so as to study the force movement and discharge characteristics of the water droplets in the whole process of falling, adhering to the insulator surface and leaving the insulator, and analyze the influence of the position and size of the water droplets on the falling discharge of the water droplets.

[0045] The insulator 5 is connected in parallel with the power frequency voltage divider 6, and the pulse current measuring device 2 is arranged in the circuit on one side of the power frequency voltage divider 6 and the insulator 5. One end of the power frequency voltage divider 6 is also connected to the protective resistor 7, and the other end of the power frequency voltage divider 6 is also connected to the high voltage winding 8 of the power frequency test transformer 9.

[0046] First, the high voltage electricity output from the power frequency test transformer 9 is transmitted through the high voltage winding 8. Then, the high voltage electricity is isolated by the protection resistor 7 to ensure the safe operation of the circuit. Then, the current is divided by the power frequency voltage divider 6 to reduce the voltage level for subsequent measurement and protection.

[0047] The current passes through the pulse current measuring device 2, which measures the current in the circuit. At the same time, the image acquisition system is used to capture various phenomena or events that may occur when the insulator 5 hits the water droplets for analysis and research. The rain shower device 1 is used to simulate severe weather conditions to test the working stability and insulation performance of the circuit in a wet environment. Finally, after all the data is collected, it is transmitted to the computer 4 for storage, analysis and display.

[0048] In summary, the prior art only uses a pulse current measuring device to measure pulse current or an ultraviolet imager to monitor corona, and does not combine with a camera to shoot the force movement and discharge characteristics of water droplets during the entire process of water droplets falling, adhering to the surface of the insulator, and leaving the insulator, so that it is impossible to obtain the relationship between water droplets and the corona on the surface of the insulator under rain conditions, and cannot meet the research needs. The utility model combines a rain device 1, a pulse current measuring device 2, and an image acquisition system. The rain device 1 can control the rain angle and the amount of rain to simulate the corona discharge of insulators in an electric field environment under various rain conditions. The camera 3 records the movement of water droplets, and the pulse current measuring device 2 monitors the pulse current flowing through the insulator. The camera 3 and the pulse current measuring device 2 are synchronously controlled and triggered by a computer to achieve a one-to-one correspondence between the corona pulse current and the force movement and discharge form of the water droplets under the camera 3. The camera 3 shoots the movement and discharge characteristics of water droplets during the entire process of water droplets falling, adhering to the surface of the insulator, and leaving the insulator 5, and analyzes the influence of water droplets on the corona discharge on the surface of the insulator 5. Thus, a test platform for studying the influence of water droplets on the corona discharge on the surface of insulators under rain conditions is formed, which meets the needs of research and testing. In addition, the utility model can provide test data for the formulation and revision of relevant standards, and can also provide a reference for insulator design.

[0049] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.

[0050] The above content is a further detailed description of the utility model. It cannot be determined that the specific implementation methods of the utility model are limited to these. For ordinary technicians in the technical field to which the utility model belongs, they can make some simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the protection scope of the utility model determined by the submitted claims.

Claims

1. A test platform for the effect of water droplets on corona discharge on the surface of insulators, characterized in that: It comprises a rain shower device (1), a pulse current measuring device (2) and an image acquisition system; The shower device (1) is used to spray water on the insulator (5); The pulse current measuring device (2) is used to measure the peak value of the pulse current of the insulator (5) when the rain shower device (1) is working; The image acquisition system is used to capture the process of water drops sprayed by the shower device (1) falling on the insulator (5).

2. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 1, characterized in that: The shower device (1) comprises a movable base, a spray device and a lifting system; The movable base is installed below the lifting system, and a spray device is arranged above the lifting system.

3. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 2, characterized in that: The spray device includes a shower row and a spray head; The shower row is installed in the upper area of ​​the lifting device; The spray head is installed on the shower row.

4. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 2, characterized in that: The spray device is made of anti-corrosion material.

5. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 2, characterized in that: The movable base is provided with an anti-rollover device.

6. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 2, characterized in that: The shower device (1) further comprises a tape reel; The tape reel is used to collect the water tape between the spray device and the water source.

7. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 1, characterized in that: The image acquisition system comprises a camera (3); The camera (3) is used to take photos or videos of the process of water drops falling on the insulator (5).

8. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 1, characterized in that: Also included is a collection device; The collecting device is used to trigger the pulse current measuring device (2) and the image collecting system to start working, and to collect the working results generated by the pulse current measuring device (2) and the image collecting system.

9. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 8, characterized in that: The collection device comprises a computer (4); The computer (4) is arranged between the pulse current measuring device (2) and the image acquisition system.

10. A test platform for the effect of water droplets on corona discharge on the surface of insulators according to claim 1, characterized in that: The insulator (5) is connected in parallel with the power frequency voltage divider (6); The power frequency voltage divider (6) is also connected to the high voltage winding (8) of the power frequency test transformer (9); A protective resistor (7) is provided between the power frequency voltage divider (6) and the high voltage winding (8) of the power frequency test transformer (9).

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