Test method for dynamic breakdown of environment-friendly gas type disconnecting switch

Abstract

The invention belongs to the technical field of high-voltage switches, discloses a test method for dynamic breakdown of an environment-friendly gas type disconnecting switch, and aims to solve the problems of low test efficiency and high cost. The method comprises the following steps: acquiring a test device and a breakdown voltage control circuit and connecting the test device and the breakdown voltage control circuit; a moving contact in the test device is driven to move in the direction towards a static contact, and meanwhile, the breakdown voltage is gradually increased through a breakdown voltage control circuit; a moving contact in the test device is driven to move in the direction away from a static contact, and meanwhile, the breakdown voltage is gradually reduced through a breakdown voltage control circuit; and obtaining the movement distance of the moving contact and the corresponding breakdown voltage in the switching-on and switching-off processes so as to respectively obtain a plurality of groups of electrode distances and the corresponding breakdown voltage of each group. According to the method, data of the electrode distance and the corresponding breakdown voltage in the whole opening and closing process can be efficiently obtained only through one-time opening and closing operation, the test is closer to the actual situation, the test efficiency and accuracy are remarkably improved, and meanwhile the test cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage switches, and in particular relates to a test method for dynamic breakdown of an environmentally friendly gas type isolating switch. Background Art

[0002] Previously, most high-voltage equipment usually used SF 6 However, the research on environmentally friendly isolating switchgear has become a hot topic in the high-voltage switchgear industry. 6 Gas has become an important development direction of my country's power switch industry, and the market potential is huge, especially the environmental protection gas to SF 6 The replacement of environmentally friendly gases is particularly eye-catching. In order to further study the breakdown characteristics of environmentally friendly gases, it is necessary to carry out breakdown voltage tests at different electrode distances. At present, this type of research mostly uses mechanical methods to adjust the electrode spacing. Specifically, first fill the isolating switch cylinder with environmentally friendly gases, gradually increase the voltage at both ends of the isolating switch until breakdown, then adjust the spacing between the moving contact and the static contact and repeat the test, and record the breakdown voltage of the spherical and flat electrodes at different spacings. However, this method has the disadvantages of low test efficiency and high cost. Summary of the invention

[0003] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a test method for dynamic breakdown of an environmentally friendly gas-type disconnector that meets one or more of the above-mentioned needs, aiming to be closer to actual working conditions, thereby improving test efficiency and accuracy, and effectively reducing costs.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] The present invention provides a test method for dynamic breakdown of an environmentally friendly gas-type disconnector, comprising the steps of: S1, obtaining a test device and a breakdown voltage control circuit; S2, driving a moving contact in the test device to move in a direction toward a static contact in the test device, and at the same time gradually increasing the breakdown voltage through the breakdown voltage control circuit, thereby completing closing; S3, driving the moving contact in the test device to move in a direction away from the static contact in the test device, and at the same time gradually reducing the breakdown voltage through the breakdown voltage control circuit, thereby completing opening; S4, obtaining the movement distance and corresponding breakdown voltage of the moving contact in the closing and opening, so as to respectively obtain multiple groups of electrode distances and the corresponding breakdown voltages of each group, thereby completing the dynamic insulation breakdown test of the environmentally friendly gas-type disconnector.

[0006] As a preferred solution, the test device includes an air chamber, a test component and an observation component; the air chamber includes a test chamber and a pressure-stabilizing chamber; the test component includes a gas charging and discharging component and a switch-opening and closing component; the test component also includes a control component for controlling the switch-opening and closing component and a displacement sensor for monitoring the electrode distance of the switch-opening and closing component.

[0007] As a preferred solution, the breakdown voltage control circuit includes a power supply component, a breakdown voltage adjustment component and a signal acquisition component; the signal acquisition component is connected to the displacement sensor.

[0008] As a preferred solution, the power supply component includes a high-voltage AC power supply and a rectifier; the breakdown voltage adjustment component includes a resistor and a capacitor; and the signal acquisition component includes an oscilloscope.

[0009] As a preferred solution, the control component includes a driving mechanism for controlling the movement displacement and speed of the opening and closing component and a transmission mechanism for transmitting the power generated by the driving mechanism to the opening and closing component; the transmission mechanism includes an insulating part connected to the driving component and a gear transmission part connected to the opening and closing component.

[0010] As a preferred solution, the test cavity is enclosed by a shell, a cover plate and two pot-type insulators; the voltage-stabilizing cavity is enclosed by a transition cylinder and two pot-type insulators; the pot-type insulator includes a convex surface, and the convex surface faces the test cavity.

[0011] As a preferred solution, the opening and closing assembly includes a moving contact, a static contact, a moving end support and a static end support; the moving contact is threadedly connected to the moving end support; the static contact is threadedly connected to the static end support.

[0012] As a preferred solution, the test assembly also includes a pressure relief valve for explosion prevention; the gas charging and discharging assembly includes an inflation valve, an exhaust valve and a pressure gauge for monitoring the inflation pressure of the test chamber.

[0013] As a preferred solution, the observation component includes a measuring component for measuring spectrum and / or temperature; the measuring component includes a spectrometer and a spectrum shooting window arranged on the air chamber; the spectrum shooting window is tilted and has an angle of 45° with the axis of the gear shaft.

[0014] As a preferred solution, the observation component also includes an observation component for observing insulation tests; the observation component includes a camera and a high-speed camera window arranged on the air chamber; two high-speed camera windows are provided; each of the high-speed camera windows is tilted and has an angle of 45° with the axis of the gear shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The displacement sensor is arranged on the moving contact, which can accurately monitor its movement distance during the opening and closing process, and provide reliable data support for the breakdown test. By collecting signals through the oscilloscope, only one opening and closing operation is required to efficiently obtain a series of relationship data between the electrode distance and the corresponding breakdown voltage during the entire opening and closing process. This method not only makes the test closer to the actual situation, but also significantly improves the test efficiency and accuracy, while reducing the test cost.

[0017] 2. The pressure relief valve can effectively prevent the pressure in the shell from being too high during the test. Compared with the traditional disposable bursting disc protection device, the design is optimized, which not only improves the test efficiency, but also has the characteristics of multiple uses, thereby significantly saving the test cost.

[0018] 3. The pot-type insulator comprises a convex surface, which faces the test cavity. The convex surface faces the test cavity and can structurally withstand greater pressure, thereby increasing the stability of the test device.

[0019] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the flow chart of the test method described in the embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the test device described in the embodiment of the present invention.

[0023] Figure 3 2 is a side view of the test device according to an embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the breakdown voltage control circuit described in an embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the matching types of the moving and static end electrode structures described in an embodiment of the present invention, wherein a is a needle-plate electrode type, b is a ball-plate electrode type, and c is a plate-plate electrode type.

[0026] Figure Number:

[0027] 110, test chamber; 111, housing; 112, cover plate; 113, pot-type insulator; 1131, convex surface;

[0028] 120, pressure stabilizing chamber; 121, transition cylinder;

[0029] 210. Gas charging and discharging assembly;

[0030] 211, charging valve; 212, exhaust valve; 213, pressure gauge;

[0031] 220, opening and closing components;

[0032] 221, moving contact; 222, static contact; 223, moving end support; 224, static end support;

[0033] 230, control components;

[0034] 231. Driving mechanism;

[0035] 232, transmission mechanism; 2321, insulating member; 2322, gear transmission member;

[0036] 250, pressure relief valve;

[0037] 311, spectrum shooting window;

[0038] 321. High-speed camera window. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the drawings and specific embodiments of the specification. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, not all embodiments. Therefore, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work should fall within the scope of protection of the present invention. In addition, the orientation or position relationship indicated by the terms "vertical", "horizontal", "front", "rear", etc. mentioned in the embodiments of the present invention is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. It should be further explained that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like in the description should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiment 1:

[0041] like Figure 1 As shown, the present embodiment provides a test method for dynamic breakdown of an environmentally friendly gas-type disconnecting switch, comprising the steps of: S1, obtaining a test device and a breakdown voltage control circuit, and connecting the test device and the breakdown voltage control circuit; S2, driving the moving contact 221 in the test device to move in a direction toward the static contact 222 in the test device, and at the same time gradually increasing the breakdown voltage through the breakdown voltage control circuit, thereby completing closing; S3, driving the moving contact 221 in the test device to move in a direction away from the static contact 222 in the test device, and at the same time gradually reducing the breakdown voltage through the breakdown voltage control circuit, thereby completing opening; S4, obtaining the movement distance and corresponding breakdown voltage of the moving contact 221 in the closing and opening, so as to obtain multiple groups of electrode distances and the corresponding breakdown voltages of each group, respectively, thereby completing the dynamic insulation breakdown test of the environmentally friendly gas-type disconnecting switch.

[0042] like Figure 1-3As shown, the test device includes an air chamber, a test assembly and an observation assembly. The air chamber includes a test chamber 110 and a pressure stabilizing chamber 120, and the test assembly includes a gas charging and discharging assembly 210, a switch-opening assembly 220, a control assembly 230 for controlling the switch-opening assembly 220, and a displacement sensor (not shown in the drawings) for monitoring the electrode distance of the switch-opening assembly 220.

[0043] In this embodiment, a displacement sensor is installed on the moving contact 221 to monitor the movement distance of the moving contact 221 during the opening and closing process. When the voltage between the two electrodes exceeds the breakdown voltage, the electrode breaks down. After the breakdown, C2 begins to discharge, the voltage disappears, and the arc in the electrode gap of the isolating switch is extinguished; after the arc is extinguished in the electrode gap, C1 continues to charge and pressurize the capacitor C2 through the resistor R again, and the moving contact 221 continues to move, increasing the distance between the two electrodes. Whenever the voltage provided by the capacitor C2 to both ends of the electrode exceeds the breakdown voltage at this distance, the electrode is broken down again. This process is repeated, and a series of breakdown voltage data corresponding to the electrode distance can be obtained through a single opening and closing operation, which greatly improves the efficiency of studying the insulation performance of environmentally friendly gases.

[0044] The control assembly 230 includes a driving mechanism 231 for controlling the movement displacement and speed of the opening and closing assembly 220 and a transmission mechanism 232 for transmitting the power generated by the driving mechanism 231 to the opening and closing assembly 220. The transmission mechanism 232 includes an insulating member 2321 connected to the driving assembly and a gear transmission member 2322 connected to the opening and closing assembly 220.

[0045] The test chamber 110 is enclosed by a housing 111, a cover plate 112 and two pot-type insulators 113, and the voltage-stabilizing chamber 120 is enclosed by a transition cylinder 121 and two pot-type insulators 113. The pot-type insulator 113 includes a convex surface 1131, which faces the test chamber 110. The convex surface 1131 faces the test chamber 110, and the structure can withstand greater pressure, thereby increasing the stability of the test device.

[0046] The switch-opening and closing assembly 220 includes a moving contact 221, a stationary contact 222, a moving end support 223 and a stationary end support 224. The moving contact 221 is threadedly connected to the moving end support 223, and the stationary contact 222 is threadedly connected to the stationary end support 224. The moving contact 221 and the stationary contact 222 are respectively connected to the moving contact 221 seat and the stationary contact 222 seat by threaded connection. The threaded connection can efficiently replace the tip electrode, ball head electrode, and plate-plate electrode of the moving end plate and the stationary end. The moving and stationary end electrode structure matching types are as follows: Figure 5As shown, a is a needle-plate electrode type, b is a ball-plate electrode type, and c is a plate-plate electrode type. The contact and the contact seat are connected by threads, and the contact is easy to replace, which can improve the richness and efficiency of the test.

[0047] The test assembly also includes a pressure relief valve 250 for explosion prevention. The pressure relief valve 250 can effectively prevent excessive pressure in the shell 111 during the test. Compared with the traditional disposable bursting disc protection device, the design is optimized, which not only improves the test efficiency, but also has the characteristics of multiple uses, thereby significantly saving the test cost.

[0048] The gas charging and discharging assembly 210 includes a charging valve 211 , an exhaust valve 212 , and a pressure gauge 213 for monitoring the charging pressure of the test chamber 110 .

[0049] The observation component includes a measuring component for measuring spectrum and / or temperature, and the measuring component includes a spectrometer and a spectrum shooting window 311 arranged on the gas chamber, and the spectrum shooting window 311 is tilted and has an angle of 45° with the axis of the gear shaft.

[0050] The observation component also includes an observation component for observing the insulation test, and the observation component includes a camera and a high-speed camera window 321 arranged on the air chamber. Two high-speed camera windows 321 are provided, and each high-speed camera window 321 is tilted and has an angle of 45° with the axis of the gear shaft. Furthermore, the high-speed camera window 321 can be designed in an elliptical shape, so that the observation range is larger, and the test conditions at different opening distances can be clearly seen. The high-speed camera window 321 is arranged vertically, and a high-speed camera is used to observe the dynamic process of the entire insulation test from two angles, which is convenient for studying the insulation breakdown of the two contacts.

[0051] like Figure 4The breakdown voltage control circuit shown includes a power supply component, a breakdown voltage adjustment component and a signal acquisition component, and the signal acquisition component is connected to the displacement sensor. The power supply component includes a high-voltage AC power supply and a rectifier; the breakdown voltage adjustment component includes a resistor and a capacitor; and the signal acquisition component includes an oscilloscope. According to the provisions on peak voltage in GB 1985-2014 "High-voltage AC disconnector and grounding switch", a corresponding margin is set for the high-voltage AC power supply to ensure that its voltage value is higher than the specified standard. The voltage signal is collected by the oscilloscope, and combined with the voltage divider ratio between capacitors C2 and C3, the stroke between the electrodes of the disconnector and the corresponding breakdown voltage value can be obtained. After the dynamic and static electrodes of the disconnector are separated, capacitor C2 is in an open circuit state. At this time, capacitor C1 charges capacitor C2 through charging resistor R, causing the voltage of capacitor C2 to rise rapidly. When the voltage of capacitor C2 exceeds the breakdown voltage of the electrode gap, the electrode gap breaks down. After the breakdown, capacitor C2 begins to discharge, the voltage disappears, and the arc of the disconnector electrode gap is extinguished. After the arc is extinguished, capacitor C1 charges capacitor C2 again through charging resistor R, and the voltage of capacitor C2 rises rapidly again and causes a new breakdown. This process - charging, breakdown, discharge, arc extinguishing, and recharging - is repeated continuously during the opening operation, forming a repeated breakdown phenomenon. As the opening distance continues to increase, the breakdown voltage gradually increases until the electrode gap becomes large enough to no longer be broken down. By measuring the change of the electrode gap breakdown voltage over time, the dynamic breakdown characteristics of the electrode gap during the disconnection process can be obtained. The principle of the change of the electrode gap breakdown voltage over time during the closing process is the same.

[0052] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0053] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. The present invention is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A test method for dynamic breakdown of an environmentally friendly gas-type isolating switch, characterized in that: Includes steps: S1. Obtain a test device and a breakdown voltage control circuit; S2, driving the moving contact (221) in the test device to move in a direction toward the stationary contact (222) in the test device, and at the same time gradually increasing the breakdown voltage through the breakdown voltage control circuit, thereby completing the closing; S3, driving the moving contact (221) in the test device to move in a direction away from the stationary contact (222) in the test device, and at the same time gradually reducing the breakdown voltage through the breakdown voltage control circuit, thereby completing the opening; S4. Obtain the movement distance and corresponding breakdown voltage of the moving contact (221) during the closing and opening of the switch, so as to obtain multiple groups of electrode distances and the corresponding breakdown voltage of each group, thereby completing the dynamic insulation breakdown test of the environmentally friendly gas type disconnector.

2. The test method for dynamic breakdown of an environmentally friendly gas-type isolating switch according to claim 1, characterized in that: The test device comprises an air chamber, a test assembly and an observation assembly; The air chamber comprises a test chamber (110) and a pressure stabilization chamber (120); The test assembly comprises a gas charging and discharging assembly (210) and a switch-on and switch-off assembly (220); The test component further comprises a control component (230) for controlling the opening and closing component (220) and a displacement sensor for monitoring the electrode distance of the opening and closing component (220).

3. The test method for dynamic breakdown of an environmentally friendly gas type disconnector according to claim 2 is characterized in that: The breakdown voltage control circuit includes a power supply component, a breakdown voltage adjustment component and a signal acquisition component; The signal acquisition component is connected to the displacement sensor.

4. The test method for dynamic breakdown of an environmentally friendly gas-type isolating switch according to claim 3 is characterized in that: The power supply assembly includes a high-voltage AC power supply and a rectifier; The breakdown voltage adjustment component includes a resistor and a capacitor; The signal acquisition component includes an oscilloscope.

5. The test method for dynamic breakdown of an environmentally friendly gas-type isolating switch according to claim 4, characterized in that: The control component (230) comprises a driving mechanism (231) for controlling the movement displacement and speed of the opening and closing component (220) and a transmission mechanism (232) for transmitting the power generated by the driving mechanism (231) to the opening and closing component (220); The transmission mechanism (232) comprises an insulating member (2321) connected to the driving assembly and a gear transmission member (2322) connected to the opening and closing assembly (220).

6. A test method for dynamic breakdown of an environmentally friendly gas-type disconnector according to claim 5, characterized in that: The test chamber (110) is enclosed by a housing (111), a cover plate (112) and two pot-type insulators (113); The voltage stabilizing chamber (120) is enclosed by a transition cylinder (121) and two pot-type insulators (113); The pot-type insulator (113) comprises a convex surface (1131), and the convex surface (1131) faces the test cavity (110).

7. A test method for dynamic breakdown of an environmentally friendly gas-type disconnector according to claim 6, characterized in that: The opening and closing switch assembly (220) comprises a moving contact (221), a stationary contact (222), a moving end support (223) and a stationary end support (224); The moving contact (221) is threadedly connected to the moving end support (223); The static contact (222) is connected to the static end support (224) via threads.

8. The test method for dynamic breakdown of an environmentally friendly gas-type disconnector according to claim 7 is characterized in that: The test assembly also includes a pressure relief valve (250) for explosion prevention; The gas charging and discharging assembly (210) comprises a charging valve (211), an exhaust valve (212), and a pressure gauge (213) for monitoring the charging pressure of the test chamber (110).

9. A test method for dynamic breakdown of an environmentally friendly gas-type disconnector according to claim 8, characterized in that: The observation component includes a measurement component for measuring spectrum and / or temperature; The measuring component comprises a spectrometer and a spectrum shooting window (311) arranged on the gas chamber; The spectrum shooting window (311) is tilted and has an angle of 45° with the axis of the gear shaft.

10. A test method for dynamic breakdown of an environmentally friendly gas-type disconnector according to claim 9, characterized in that: The observation assembly also includes an observation assembly for observing insulation testing; The observation assembly includes a camera and a high-speed camera window (321) arranged on the air chamber; The high-speed camera windows (321) are provided with two; Each of the high-speed camera windows (321) is tilted and has an angle of 45° with the axis of the gear shaft.

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