Heating analog simulation device of lightning arrester

Abstract

The utility model relates to a lightning arrester heating simulation device, which comprises a layered shell assembly, a multistage temperature control module and a valve plate simulation assembly, the layered shell assembly comprises a plurality of insulating sleeves which are coaxially arranged, the outer surface of each insulating sleeve is provided with an annular heat dissipation groove, and the valve plate simulation assembly is provided with a plurality of temperature control modules. The multi-stage temperature control module comprises an independent heating unit and a main control box body which are arranged in an insulating sleeve, the valve plate simulation assembly comprises multiple layers of stacked zinc oxide valve plates arranged in the independent heating unit, and reference can be provided for judgment of the infrared temperature measurement defect of the lightning arrester in daily operation and maintenance work.

Description

Technical Field

[0001] This utility model relates to a simulation device for simulating the heating of a surge arrester, belonging to the field of surge arrester technology. Background Technology

[0002] When simulating heating defects in power equipment, the local heating defect of zinc oxide surge arrester is a typical voltage-induced heating defect, and its simulation is essential.

[0003] Currently, when maintenance personnel conduct infrared thermography, they first perform general checks. After identifying abnormal temperature points, they need to conduct precise checks to pinpoint the hot spot temperature and the location of the heat source. Precise checks require maintenance personnel to be more proficient in operating the infrared thermometer and to have a more reasonable understanding of the instrument parameters. Especially for voltage-heated defects, due to their small temperature difference, the accuracy of the detection results is directly affected by the maintenance personnel's skill level, and may even lead to the failure to detect the hot spot.

[0004] Therefore, providing a simulation device for simulating the heating of surge arresters to help determine defects in infrared temperature measurement of surge arresters during routine operation and maintenance is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a surge arrester heating simulation device, which can provide a reference for judging surge arrester infrared temperature measurement defects in daily operation and maintenance work.

[0006] The technical solution of this utility model is as follows:

[0007] A surge arrester heating simulation device includes a layered housing assembly, a multi-stage temperature control module, and a valve plate simulation assembly. The layered housing assembly includes multiple coaxially arranged insulating sleeves, each of which has an annular heat dissipation groove on its outer surface. The multi-stage temperature control module includes an independent heating unit and a main control box disposed inside the insulating sleeve. The valve plate simulation assembly includes multiple stacked zinc oxide valve plates disposed inside the independent heating unit.

[0008] The main control box has a built-in programmable logic controller and a touch control panel on its surface. The independent heating unit includes a ring-shaped resistance wire and a ceramic base. The ring-shaped resistance wire is nested in a ring-shaped groove on the inner wall of the ceramic base and is connected to the main control box through a conductive lead. The heating surface of the ring-shaped resistance wire contacts the outer surface of the zinc oxide valve plate.

[0009] The adjacent insulating sleeves are fixed together by snap-fit ​​connecting rings, and the inner wall of the insulating sleeve is provided with an array of micro-pores.

[0010] The outer peripheral surface of the ceramic base and the inner wall of the insulating sleeve form an interference fit, and a thermally conductive silicone layer is filled between the ceramic base and the insulating sleeve.

[0011] Each zinc oxide valve plate has a thermally conductive coating on its outer edge, and axially adjacent zinc oxide valve plates are separated by threaded insulating support columns, and each zinc oxide valve plate has a heat-conducting film attached to its surface.

[0012] The multi-level temperature control module also includes a branch relay, which is connected to each independent heating unit through a multi-core shielded cable. The contact switch of the branch relay is installed inside the main control box.

[0013] This utility model has the following beneficial effects:

[0014] This utility model achieves accurate simulation of axial gradient heating of surge arresters by combining multiple coaxial insulating sleeves and annular heat dissipation grooves in a layered shell assembly, combined with the linkage control of independent heating units of multi-level temperature control modules and main control box, and the multi-layer zinc oxide valve plate stacking structure of valve plate simulation assembly. It achieves the effect of reproducing the deterioration thermal field distribution of real surge arrester valve plates in a safe environment.

[0015] Through the hierarchical assembly structure of the snap-fit ​​connecting ring and the interference fit of the thermally conductive silicone layer, the thermal resistance gradient of the device is rapidly reconstructed, achieving the effect of simulating the surface temperature field characteristics of the surge arrester under different heat dissipation conditions.

[0016] By combining the thermally conductive coating on the outer edge of the zinc oxide valve plate with the surface thermally conductive film, and the directional heat transfer structure of the annular resistance wire and the ceramic base, the visual monitoring of the heating defects of the surge arrester core is realized, achieving the technical effect of improving the ability of maintenance personnel to identify defects by infrared temperature measurement. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0018] The reference numerals in the figure are as follows:

[0019] 101. Insulating sleeve; 102. Heat dissipation groove; 103. Snap-on connecting ring; 104. Miniature vent; 201. Main control box; 206. Ring resistance wire; 207. Ceramic base; 301. Zinc oxide valve plate; 302. Thermally conductive coating; 303. Insulating support column. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Please see Figure 1 The utility model provides a technical solution:

[0022] The surge arrester heating simulation device of this embodiment includes a layered shell assembly, a multi-stage temperature control module, and a valve plate simulation assembly. The layered shell assembly includes multiple coaxially arranged insulating sleeves 101, which are fixed together by snap-fit ​​connecting rings 103. Each insulating sleeve 101 has an annular heat dissipation groove 102 on its outer surface. Preferably, the inner wall of the insulating sleeve 101 is arrayed with micro-pores 104. Multiple insulating sleeves 101 are aligned coaxially along the axis and assembled by locking them layer by layer with snap-fit ​​connecting rings 103. The annular heat dissipation grooves 102 need to face a preset heat dissipation direction, which is usually consistent with the natural convection direction. The distribution density of the micro-pores 104 on the inner wall is adjusted according to the simulated working conditions. This assembly simulates the axial thermal resistance gradient of the outer insulating sleeve 101 of a real surge arrester through a layered heat dissipation structure.

[0023] The multi-stage temperature control module includes an independent heating unit and a main control box 201 disposed inside the insulating sleeve 101, and the valve plate simulation assembly includes multi-layer stacked zinc oxide valve plates 301 disposed inside the independent heating unit.

[0024] The annular heat dissipation groove 102 of the insulating sleeve 101 simulates the heat dissipation fins of the outer insulating cylinder of the surge arrester, and the directional airflow through the micro air holes 104 achieves local forced heat dissipation; the snap-on connecting ring 103 provides an axially detachable structure, supporting quick replacement of specific layers of the insulating sleeve 101 to adjust the thermal resistance gradient.

[0025] The main control box 201 has a built-in programmable logic controller and a touch control panel on its surface; the independent heating unit includes a ring resistance wire 206 and a ceramic base 207. The ring resistance wire 206 is nested in the ring groove on the inner wall of the ceramic base 207 and is connected to the main control box 201 through conductive leads. The heating surface of the ring resistance wire 206 contacts the outer surface of the zinc oxide valve plate 301.

[0026] After the target temperature curve is input via the touch control panel 205 in the main control box 201, the programmable logic controller decomposes the instruction into control signals for each independent heating unit. During operation, the annular resistance wire 206 needs to be precisely embedded in the annular groove of the ceramic base 207. After being powered on, the annular resistance wire 206 heats up, and its heating surface directly contacts the outer surface of the zinc oxide valve plate 301, simulating the Joule heating of the leakage current caused by the deterioration of the zinc oxide valve plate 301.

[0027] It is worth mentioning that the wiring sequence of the conductive leads must be strictly in accordance with the hierarchical numbering to avoid thermal field misalignment, realize multi-level independent temperature control, and reproduce the differences in heating at different locations of the surge arrester.

[0028] The outer circumferential surface of the ceramic base 207 forms an interference fit with the inner wall of the insulating sleeve 101, and a thermally conductive silicone layer is filled between the ceramic base 207 and the insulating sleeve 101. Specifically, the ceramic base 207 is press-fitted to the inner wall of the insulating sleeve 101 using an interference fit. The thermally conductive silicone layer needs to be preheated to 60°C before injection to reduce its viscosity, and after curing, it forms a continuous thermal interface. This structure simulates the contact thermal resistance between the core and the outer shell of a real surge arrester, and also compensates for the difference in thermal expansion coefficients between the ceramic and the sleeve through the elastic modulus of the silicone.

[0029] Each zinc oxide valve plate 301 has a thermally conductive coating 302 on its outer edge, and axially adjacent zinc oxide valve plates 301 are separated by threaded insulating support pillars 303. Each zinc oxide valve plate 301 has a heat-conducting film attached to its surface. Before stacking, the zinc oxide valve plates 301 are coated with an aluminum nitride thermally conductive coating 302 on their outer edges to simulate the effect of the oxide layer on the surface of the zinc oxide valve plates 301 on heat dissipation. The surface heat-conducting film uses a reversible thermochromic material for visually monitoring the axial temperature distribution of the valve plates.

[0030] The multi-stage temperature control module also includes branch relays, which are connected to each independent heating unit via multi-core shielded cables. The contact switches of the branch relays are installed inside the main control box 201.

[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A simulation device for simulating the heating of a surge arrester, characterized in that: The device includes a layered housing assembly, a multi-stage temperature control module, and a valve plate simulation assembly. The layered housing assembly includes multiple coaxially arranged insulating sleeves (101), each of which has an annular heat dissipation groove (102) on its outer surface. The multi-stage temperature control module includes an independent heating unit and a main control box (201) disposed inside the insulating sleeve (101). The valve plate simulation assembly includes multiple layers of stacked zinc oxide valve plates (301) disposed inside the independent heating unit.

2. The surge arrester heating simulation device as described in claim 1, characterized in that: The main control box (201) has a built-in programmable logic controller and a touch control panel on its surface; the independent heating unit includes an annular resistance wire (206) and a ceramic base (207). The annular resistance wire (206) is nested in an annular groove on the inner wall of the ceramic base (207) and is connected to the main control box (201) through conductive leads. The heating surface of the annular resistance wire (206) contacts the outer surface of the zinc oxide valve plate (301).

3. The surge arrester heating simulation device as described in claim 1, characterized in that: The adjacent insulating sleeves (101) are fixed together by snap-fit ​​connecting rings (103), and the inner wall of the insulating sleeves (101) is provided with micro air holes (104).

4. The surge arrester heating simulation device as described in claim 2, characterized in that: The outer peripheral surface of the ceramic base (207) and the inner wall of the insulating sleeve (101) form an interference fit, and a thermally conductive silicone layer is filled between the ceramic base (207) and the insulating sleeve (101).

5. The surge arrester heating simulation device as described in claim 1, characterized in that: Each zinc oxide valve plate (301) has a thermally conductive coating (302) on its outer edge, and axially adjacent zinc oxide valve plates (301) are separated by threaded insulating support columns (303), and each zinc oxide valve plate (301) has a heat-conducting film attached to its surface.

6. The surge arrester heating simulation device as described in claim 2, characterized in that: The multi-level temperature control module also includes a branch relay, which is connected to each independent heating unit through a multi-core shielded cable. The contact switch of the branch relay is installed inside the main control box (201).

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