A lightning arrester thunderstorm working condition simulation platform and lightning arrester status evaluation method

Abstract

The present invention discloses an experimental lightning arrester thunderstorm operating condition simulation platform and a lightning arrester state assessment method, relating to the field of lightning arrester measurement technology. The experimental lightning arrester thunderstorm operating condition simulation platform and the lightning arrester state assessment method add a water spray device within a high-voltage shielding cover, which can effectively simulate the operating scenario of the lightning arrester thunderstorm operating condition. Effective simulation parameters for the operating state of the lightning arrester can be provided by adjusting parameters such as the water spray volume. The experimental lightning arrester thunderstorm operating condition simulation platform and the lightning arrester state assessment method calculate the characteristic parameters of the lightning arrester state by drawing an elliptical trajectory representing the lightning arrester state, and then use the characteristic parameters to calculate the lightning arrester state assessment factor, ultimately determining whether the lightning arrester meets the operating requirements of the target environment.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arrester testing, in particular to an experimental lightning arrester thunderstorm working condition simulation platform and a lightning arrester state evaluation method. Background Art

[0002] Lightning arresters are critical devices used to protect electrical equipment and power systems. During a lightning event, they quickly direct the overvoltage from the lightning to the ground, protecting equipment from electric shock and damage. To ensure proper functioning of lightning arresters, they require experimental research and diagnostics.

[0003] There is currently no experimental platform for simulating thunderstorm conditions in traditional lightning arrester test platforms, and there is also a lack of lightning arrester status assessment methods for this scenario.

[0004] Chinese invention patent publication number CN116168907A discloses a lightning arrester installation structure and its use method, and Chinese utility model patent publication number CN215415518U discloses a zinc oxide lightning arrester test bracket. Although a telescopic bracket or a screw structure is used to adjust the height of the lightning arrester, it is still impossible to simulate thunderstorm conditions.

[0005] Chinese invention patent publication number CN102032242A discloses an online monitoring method for the operating status of a hydraulic system based on electrical parameter information fusion. The method uses Lissajous figures to perform single-phase and three-phase fusion analysis, calculates the relationship between electrical parameters and various characteristic quantities of an ellipse, and, by calculating the changes in the ellipse's area, shape, rotation direction, rotation angle, and ratio, enables real-time monitoring of the operating status, operating conditions, load power, and power matching of the hydraulic system's motor, hydraulic, and mechanical transmission devices. The method can also classify and identify motor, mechanical, and hydraulic faults in the drive system, providing a reliable basis for accurate diagnosis and energy-saving control. However, the method cannot be applied to the status assessment of lightning arresters during thunderstorms. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In view of the shortcomings of the existing technology, the present invention provides an experimental lightning arrester thunderstorm working condition simulation platform and a lightning arrester status assessment method, which solves the following technical problems:

[0008] 1. There is currently no experimental platform for simulating thunderstorm conditions in traditional lightning arrester test platforms;

[0009] 2. Currently, there is a lack of methods to assess the status of lightning arresters under thunderstorm conditions.

[0010] (2) Technical solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions: A lightning arrester status assessment method comprises the following steps:

[0012] S1: The voltage signal of the arrester in online operation measured by the voltage transformer is defined as U, and the current signal of the arrester in online operation measured by the voltage transformer is defined as I;

[0013] U=L1 cos(ωt)

[0014]

[0015] Where ω is the frequency of the electrical signal 50 Hz, is the initial phase of the arrester's online current signal, L2 is the current amplitude, the arrester's online voltage signal's initial phase is 0, L1 is the voltage amplitude, and t is the time parameter;

[0016] S2: Use trigonometric transformation to convert the arrester online operating current signal I into trigonometric function form:

[0017]

[0018] S3: cos 2 (ωt)+sin 2 Substitute (ωt)=1 into the online operation voltage signal U into the above trigonometric function form, eliminate the time parameter t, and obtain the synthesis equation of the arrester online operation voltage and current signal:

[0019]

[0020] S4: Draw the arrester state characterization elliptical trajectory in the Cartesian coordinate system according to the synthesis equation of the arrester online operation voltage and current signals, and obtain the elliptical trajectory characteristic parameters major axis A, minor axis B, and tilt angle α:

[0021] S5: Calculate the arrester state characteristic parameter f i :

[0022] f1=πAB / 4

[0023] f2=Acosα

[0024] f3=Bcosα

[0025]

[0026] S6: Calculate the arrester status assessment factor ε:

[0027]

[0028] Among them, f i ccis the characteristic parameter of the arrester when it leaves the factory, f i yx It is the characteristic parameter of the arrester when it is in online operation;

[0029] S7: Determine the operating status of the arrester based on the corresponding relationship between the evaluation factor and the actual operating status:

[0030] If the arrester status assessment factor ε≤0.48, the arrester meets the operating requirements of the target environment.

[0031] If the arrester status assessment factor ε>0.48, the arrester cannot normally meet the operating requirements.

[0032] A lightning arrester thunderstorm working condition simulation platform is provided for fixing the experimental lightning arrester and for the lightning arrester parameters of a lightning arrester state assessment method. The platform comprises a clamping module, a vertical lifting module, a shielding module, a high-voltage discharge module, a thunderstorm simulation module and a data acquisition module. The clamping module is arranged on the horizontal moving module, and the horizontal moving module is arranged on the vertical lifting module. The clamping module is used to fix the experimental lightning arrester, and the shielding module is used to shield the experimental lightning arrester. The shielding module is provided with a high-voltage discharge module and a thunderstorm simulation module. The thunderstorm simulation module is used to simulate the thunderstorm environment in which the experimental lightning arrester is located, and the data acquisition module is used to collect data of the experimental lightning arrester.

[0033] Preferably, the data acquisition module includes a humidity sensor, a high-voltage signal receiver, and a voltage transformer.

[0034] Preferably, the shielding module includes a high-voltage electric shielding cover, and the high-voltage discharge module includes a top high-voltage discharge electrode plate and a high-voltage conductive lower electrode plate, the top high-voltage discharge electrode plate is arranged at the top of the high-voltage electric shielding cover, and the high-voltage conductive lower electrode plate is arranged on the side wall of the high-voltage electric shielding cover.

[0035] Preferably, the thunderstorm simulation module includes a water spraying device, which is used to spray water onto the experimental lightning arrester.

[0036] Preferably, the clamping module includes two centering clamping sliders, a centering slider moving track, a screw for controlling the movement of the centering slider, a driving motor for driving the screw to rotate, and a base. The centering slider moving track is opened on the base, the centering clamping slider is slidingly connected to the centering clamping slider, the screw is threadedly connected to the centering clamping slider, and when the screw rotates, the movement directions of the two centering clamping sliders are opposite.

[0037] Preferably, the vertical lifting module includes hydraulic support rods arranged on both sides of the clamping module, driven rollers located at both ends of the hydraulic support rods, supporting guide rails for limiting the movement of the rollers, and insulating bases for supporting guide rails. When the hydraulic support rods are extended, the clamping module can be lifted up.

[0038] Preferably, a rotatable base is provided at the bottom of the insulating base.

[0039] (3) Beneficial effects

[0040] The present invention provides a lightning arrester thunderstorm working condition simulation platform and a lightning arrester status assessment method. It has the following beneficial effects:

[0041] (1) The experimental arrester thunderstorm working condition simulation platform and arrester status assessment method add a water spray device in the high-voltage shielding cover, which can effectively simulate the operation scenario of the arrester thunderstorm working condition, and can provide effective simulation parameters for the arrester operation status by adjusting parameters such as the water spraying amount.

[0042] (2) The experimental arrester thunderstorm working condition simulation platform and arrester status assessment method use the method of drawing the arrester status representation elliptical trajectory to calculate the arrester status characteristic parameters, and then use the characteristic parameters to calculate the arrester status assessment factor, and finally determine whether the arrester meets the operating requirements of the target environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the arrester online monitoring platform;

[0044] Figure 2 This is a schematic diagram of the arrester clamping and positioning device;

[0045] Figure 3 Wiring diagram for online operation status monitoring of lightning arrester;

[0046] Figure 4 This is the flow chart of the arrester online operation status monitoring system. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0048] like Figure 1 、 Figure 2As shown, a lightning arrester clamping and positioning device and a thunderstorm working condition online simulation platform mainly include: the experimental research platform mainly includes: an experimental lightning arrester 1, a centering clamping slider 2, a centering slider moving track 3, a screw 4 for controlling the movement of the centering slider, a driving motor 5 for driving the screw 4 of the centering slider to rotate, a base 6 for limiting the movement of the centering clamping slider 2, a hydraulic support rod 7 for supporting and controlling the movement of the base 6, driven rollers 8 at both ends of the hydraulic support rod 7, a supporting guide rail 9 for limiting the movement of the roller 8, an insulating base 10 for supporting the guide rail 9, and a top high-voltage discharge electrode 1 1. A voltage divider 12 connected to the discharge electrode plate, a 50kV transformer 13 connected to the voltage divider 12, a high-voltage power supply controller 14 connected to the transformer 13, a high-voltage electric shield 15, a high-voltage conductive lower plate 16 located on the high-voltage shield 15, an automatic water spray device 17 located on the top of the high-voltage shield 15, a humidity sensor 18 located on the top of the high-voltage shield 15, a high-voltage signal receiver 19, a voltage transformer 20, a rotatable base 21 located below the high-voltage electric shield 15, a motor master control device 22, and a hydraulic rod drive motor 23;

[0049] Figure 3 It is an experimental simulation of working conditions to perform online monitoring of the arrester operating status. Its characteristics are to define the current and voltage signals of the arrester in online operation, convert them into trigonometric function forms using trigonometric transformation, draw the arrester state characterization elliptical trajectory in the Cartesian coordinate system, and calculate the arrester state characteristic parameter f i and the arrester status evaluation factor ε, and finally judge the arrester operating status according to the evaluation factor, which specifically includes the following steps:

[0050] S1: The arrester online operation voltage signal measured by the voltage transformer is defined as U, and the voltage transformer is defined as

[0051] The arrester online operating current signal measured by the device is defined as I;

[0052] U=L1cos(ωt)

[0053]

[0054] Where ω is the frequency of the electrical signal 50 Hz, is the initial phase of the arrester's online current signal, L2 is the current amplitude, the arrester's online voltage signal's initial phase is 0, L1 is the voltage amplitude, and t is the time parameter;

[0055] S2: Use trigonometric transformation to convert the arrester online operating current signal I into trigonometric function form:

[0056]

[0057] S3: cos 2 (ωt)+sin2 (ωt)=1Substitute the online operation voltage signal U into the above trigonometric function form,

[0058] Eliminate the time parameter t and obtain the synthesis equation of the voltage and current signals of the arrester during online operation:

[0059]

[0060] S4: Draw the arrester state characterization elliptical trajectory in the Cartesian coordinate system according to the synthesis equation of the arrester online operation voltage and current signals, and obtain the elliptical trajectory characteristic parameters major axis A, minor axis B, and tilt angle α:

[0061] S5: Calculate the arrester state characteristic parameter f i :

[0062] f1=πAB / 4

[0063] f2=Acosα

[0064] f3=Bcosα

[0065]

[0066] S6: Calculate the arrester status assessment factor ε:

[0067]

[0068] Among them, f i cc is the characteristic parameter of the arrester when it leaves the factory, f i yx It is the characteristic parameter of the arrester when it is in online operation;

[0069] S7: Determine the operating status of the arrester based on the corresponding relationship between the evaluation factor and the actual operating status:

[0070] If the arrester status assessment factor ε≤0.48, the arrester meets the operating requirements of the target environment.

[0071] If the arrester status assessment factor ε>0.48, the arrester cannot normally meet the operating requirements.

[0072] It should be noted that, in the description of the invention, the terms "up", "down", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the description of the structure of the present invention as shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0073] The "first" and "second" in this technical solution are only used to distinguish the same or similar structures, or corresponding structures with similar functions, and are not an arrangement of the importance of these structures, nor do they have any ranking, size comparison, or other meanings.

[0074] In addition, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two structures. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on the overall principles of the present invention and the specific context of this solution.

Claims

1. A method for assessing the state of a lightning arrester, characterized in that: The steps include: S1: The voltage signal of the arrester in online operation measured by the voltage transformer is defined as U, and the current signal of the arrester in online operation measured by the voltage transformer is defined as I; U=L1cos(ωt) Where ω is the frequency of the electrical signal 50 Hz, is the initial phase of the arrester's online current signal, L2 is the current amplitude, the arrester's online voltage signal's initial phase is 0, L1 is the voltage amplitude, and t is the time parameter; S2: Use trigonometric transformation to convert the arrester online operating current signal I into trigonometric function form: S3: cos 2 (ωt)+sin 2 Substitute (ωt)=1 into the online operation voltage signal U into the above trigonometric function form, eliminate the time parameter t, and obtain the synthesis equation of the arrester online operation voltage and current signal: S4: Draw the arrester state characterization elliptical trajectory in the Cartesian coordinate system according to the synthesis equation of the arrester online operation voltage and current signals, and obtain the elliptical trajectory characteristic parameters major axis A, minor axis B, and tilt angle α: S5: Calculate the arrester state characteristic parameter f i : f1=πAB / 4 f2=Acosα f3=Bcosα S6: Calculate the arrester status assessment factor ε: Among them, f i cc is the characteristic parameter of the arrester when it leaves the factory, f i yx It is the characteristic parameter of the arrester when it is in online operation; S7: Determine the operating status of the arrester based on the corresponding relationship between the evaluation factor and the actual operating status: If the arrester status assessment factor ε≤0.48, the arrester meets the operating requirements of the target environment. If the arrester status assessment factor ε>0.48, the arrester cannot normally meet the operating requirements.

2. A lightning arrester thunderstorm working condition simulation platform for fixing an experimental lightning arrester (1), characterized by: Used to provide the arrester parameters of the arrester status evaluation method according to claim 1, the platform includes a clamping module, a vertical lifting module, a shielding module, a high-voltage discharge module, a thunderstorm simulation module and a data acquisition module, the clamping module is arranged on the horizontal moving module, the horizontal moving module is arranged on the vertical lifting module, the clamping module is used to fix the experimental arrester (1), the shielding module is used to shield the experimental arrester (1), the shielding module is provided with a high-voltage discharge module and a thunderstorm simulation module, the thunderstorm simulation module is used to simulate the thunderstorm environment in which the experimental arrester (1) is located, and the data acquisition module is used to collect data of the experimental arrester (1).

3. The experimental arrester thunderstorm working condition simulation platform according to claim 2, characterized in that: The data acquisition module includes a humidity sensor (18), a high-voltage signal receiver (19), and a voltage transformer (20).

4. The experimental arrester thunderstorm working condition simulation platform according to claim 2, characterized in that: The shielding module includes a high-voltage electric shielding cover (15), and the high-voltage discharge module includes a top high-voltage discharge electrode plate (11) and a high-voltage conductive lower electrode plate (16), wherein the top high-voltage discharge electrode plate (11) is arranged at the top inside the high-voltage electric shielding cover (15), and the high-voltage conductive lower electrode plate (16) is arranged on the side wall inside the high-voltage electric shielding cover (15).

5. The experimental arrester thunderstorm working condition simulation platform according to claim 2, characterized in that: The thunderstorm simulation module comprises a water spraying device (17), and the water spraying device (17) is used to spray water onto the experimental lightning arrester (1).

6. The experimental arrester thunderstorm working condition simulation platform according to claim 2, characterized in that: The clamping module comprises two centering clamping sliders (2), a centering slider moving track (3), a screw (4) for controlling the movement of the centering clamping slider (2), a driving motor (5) for driving the screw (4) to rotate, and a base (6); the centering slider moving track (3) is provided on the base (6); the centering clamping slider (2) is slidably connected to the centering clamping slider (2); the screw (4) is threadedly connected to the centering clamping slider (2); when the screw (4) rotates, the movement directions of the two centering clamping sliders (2) are opposite.

7. The experimental arrester thunderstorm working condition simulation platform according to claim 2, characterized in that: The vertical lifting module comprises hydraulic struts (7) arranged on both sides of the clamping module, driven rollers (8) located at both ends of the hydraulic struts (7), support guide rails (9) for limiting the movement of the rollers (8), and an insulating base (10) for supporting the guide rails (9). When the hydraulic struts (7) are extended, the clamping module can be supported and lifted.

8. The lightning arrester thunderstorm working condition simulation platform according to claim 7, characterized in that: A rotatable base (21) is provided at the bottom of the insulating base (10).

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