Safety performance detection device of power distribution cabinet

Abstract

The invention relates to the technical field of electric power distribution cabinets, in particular to a safety performance detection device for an electric power distribution cabinet, which comprises a distribution box body internally provided with a plurality of layers of shielding structures; the sensing module is integrated in the distribution box body and comprises a voltage detection unit, a current detection unit, an insulation resistance detection unit and a temperature and humidity detection unit; the data processing module is connected with the sensor module through an elastic contact structure; the outer wall of the distribution box body is provided with a heat dissipation air channel which spirally penetrates through the side wall of the shell. The conductive contact pieces are arranged in a wave shape, the hemispherical protrusions are arranged at the tail ends of the contact pieces, it is ensured that the contact area is larger than 80% under vibration, in the vibration process of the bridge body, the extrusion force of the abutting unit enables the elastic pieces and the data processing unit to be in an abutting state, and the abutting unit is made of aluminum nitride and can slide downwards along the inclined guide blocks in the vibration process; and the elastic sheet is further propped tightly, so that the connection stability is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution cabinets, and specifically relates to a safety performance detection device for a power distribution cabinet. Background Art

[0002] Distribution cabinets (boxes) are divided into power distribution cabinets (boxes), lighting distribution cabinets (boxes), and metering cabinets (boxes), and are the final-stage equipment of the power distribution system. A distribution cabinet is a general term for a motor control center. Distribution cabinets are suitable for occasions where the load is relatively dispersed and the number of circuits is small; motor control centers are used for occasions where the load is concentrated and the number of circuits is large. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearby load. This level of equipment should provide protection, monitoring, and control for the load.

[0003] The detection of the load of the distribution cabinet is an important link to ensure the safe and stable operation of the power distribution system. The main purpose is to evaluate the working performance of the distribution cabinet under load conditions, including the detection of key parameters such as voltage, current, and power factor; during the detection process, real-time data is processed to ensure that the load of the distribution cabinet is within the preset range. In coastal areas, it is relatively humid, and the distribution cabinet may be severely corroded when working in a humid environment for a long time. Especially at the joints, salt spray corrosion may cause the contact position to become loose, and insufficient electromagnetic shielding may cause signal interference (such as interference from high-frequency equipment in a substation). For distribution cabinets used on bridges, the vehicle weight and speed will excite the vibration of the bridge. Heavy vehicles or large trucks, due to their large load and high speed, have a stronger impact on the bridge and are more likely to cause obvious vibration, and mechanical connectors may fail to make contact in a vibrating scenario. Distribution cabinets (boxes) are divided into power distribution cabinets (boxes), lighting distribution cabinets (boxes), and metering cabinets (boxes), and are the final-stage equipment of the power distribution system. A distribution cabinet is a general term for a motor control center. Distribution cabinets are suitable for occasions where the load is relatively dispersed and the number of circuits is small; motor control centers are used for occasions where the load is concentrated and the number of circuits is large. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearby load. This level of equipment should provide protection, monitoring, and control for the load. The detection of the load of the distribution cabinet is an important link to ensure the safe and stable operation of the power distribution system. The main purpose is to evaluate the working performance of the distribution cabinet under load conditions, including the detection of key parameters such as voltage, current, and power factor; during the detection process, real-time data is processed to ensure that the load of the distribution cabinet is within the preset range. In coastal areas, it is relatively humid, and the distribution cabinet may be severely corroded when working in a humid environment for a long time. Especially at the joints, salt spray corrosion may cause the contact position to become loose, and insufficient electromagnetic shielding may cause signal interference (such as interference from high-frequency equipment in a substation). For distribution cabinets used on bridges, the vehicle weight and speed will excite the vibration of the bridge. Heavy vehicles or large trucks, due to their large load and high speed, have a stronger impact on the bridge and are more likely to cause obvious vibration, and mechanical connectors may fail to make contact in a vibrating scenario. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a safety performance detection device for a power distribution cabinet. The conductive contact piece is arranged in a wavy shape, and a hemispherical protrusion is provided at the end of the contact piece to ensure that the contact area remains greater than 80% under vibration. During the vibration of the bridge body, the extrusion force of the pressing unit causes the elastic piece to be in a pressed state with the data processing unit. The pressing unit is made of aluminum nitride and will slide downward along the inclined guide block during vibration to further press the elastic piece and ensure the stability of the connection.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a safety performance detection device for a power distribution cabinet, including:

[0006] A distribution box body with a multi-layer shielding structure inside;

[0007] A sensor module integrated in the distribution box body, including a voltage detection unit, a current detection unit, an insulation resistance detection unit, and a temperature and humidity detection unit;

[0008] The data processing module is connected to the sensor module through an elastic contact structure;

[0009] A heat dissipation air duct is provided on the outer wall of the distribution box body, which penetrates the side wall of the outer shell in a spiral shape.

[0010] Preferably, the elastic contact structure includes an elastic piece made of highly elastic conductive rubber. One side of the elastic piece is provided with conductive contact pieces arranged in a wavy pattern. A hemispherical protrusion is provided at the end of the contact piece, and a composite layer is plated on the surface of the hemispherical protrusion.

[0011] Preferably, the conductive contact piece is a second-level fractal corrugated structure; the main wavelength is 5 mm, the secondary wavelength is 1.5 mm, and the corrugation depth ratio is 1:0.6.

[0012] Preferably, spiral wound carbon fiber filaments are embedded in the elastic piece, and the fiber direction forms a 45° angle with the deformation axis of the contact piece.

[0013] Preferably, the data processing module includes a support frame fixedly connected to the inner wall of the distribution box body. A lifting part is provided at the bottom of the support frame, and a data processing unit is fixedly connected to the upper surface of the lifting part;

[0014] A mating contact adapted to the conductive contact piece is provided on one side of the data processing unit.

[0015] Preferably, the support frame includes an inclined guide block, and the elastic piece is placed between the inclined guide block and the data processing unit;

[0016] A pressing unit is provided between the elastic piece and the inclined guide block.

[0017] Preferably, an inclined surface adapted thereto is provided on one side of the pressing unit and one side of the inclined guide block, the pressing unit and the inclined guide block are in pressing contact, and the pressing unit is arranged in multiple sheets.

[0018] Preferably, side stabilizing guide rails are slidably inserted on both sides of the pressing unit, side guiding grooves are provided on the inner wall of the support frame, and the side stabilizing guide rails are placed in the side guiding grooves;

[0019] A soft guide plate is provided in the side guiding groove.

[0020] Preferably, a plurality of rubber sheets are provided on the surface of the inclined surface of the inclined guide block.

[0021] Preferably, the inside of the elastic sheet is hollow, and multiple groups of built-in wires are fixedly connected to the inner wall of the elastic sheet. The side of the built-in wire close to the conductive contact piece is connected to the conductive contact piece through a connection contact.

[0022] Preferably, the multi-layer shielding structure includes:

[0023] An outer electromagnetic shielding layer made of a copper-nickel alloy braided mesh;

[0024] An intermediate heat insulation layer composed of an aerogel composite material;

[0025] An inner moisture-proof layer covered with a polytetrafluoroethylene coating.

[0026] Preferably, the inner wall of the heat dissipation air duct is provided with staggered flow guiding fins, and the height of the fins is of the diameter of the heat dissipation air duct, and the distance between adjacent fins decreases in a gradient.

[0027] Advantages of the present invention:

[0028] (1) For the safety performance detection device of a power distribution cabinet described in the present invention, compared with the prior art, in this application, the conductive contact pieces are arranged in a wavy shape, and hemispherical protrusions are provided at the ends of the contact pieces to ensure that the contact area remains greater than 80% under vibration. During the vibration of the bridge body, the pressing force of the pressing unit makes the elastic sheet and the data processing unit in a pressing state. The pressing unit is made of aluminum nitride, and during the vibration process, it will slide downward along the inclined guide block to further press the elastic sheet and ensure the stability of the connection.

[0029] (2) For the safety performance detection device of a power distribution cabinet described in the present invention, the pressing unit arranged in multiple sheets can play a role in heat dissipation. The pressing unit can slide along the inclined surface provided on one side of the inclined guide block. In a vibrating environment, due to gravity, the pressing unit will slide downward along the inclined surface, thereby realizing the pressing of the elastic sheet on one side. Description of the Drawings

[0030] The present invention will be further described below with reference to the drawings and embodiments.

[0031] Figure 1 Schematic diagram of the overall structure of the present invention;

[0032] Figure 2 Connection diagram of the electrical components and the controller of the present invention;

[0033] Figure 3 Schematic diagram of the three-dimensional structure of the data processing unit of the present invention;

[0034] Figure 4 For the present invention Figure 3 Axonometric view;

[0035] Figure 5 Schematic diagram of the three-dimensional structure of the elastic contact structure of the present invention;

[0036] Figure 6 For the present invention Figure 5 Cross-sectional view;

[0037] Figure 7 Schematic diagram of the three-dimensional structure of the pressing unit of the present invention;

[0038] Figure 8 Schematic diagram of the three-dimensional structure of the support frame of the present invention;

[0039] Figure 9 For the present invention Figure 8 Enlarged view at position A in the present invention.

[0040] In the figure: 100, power distribution box body; 101, heat dissipation air duct;

[0041] 200, data processing module; 210, support frame; 212, side guide groove; 213, guide plate; 214, inclined guide block; 215, rubber sheet; 220, pressing unit; 222, side stable guide rail; 230, data processing unit; 231, mating contact; 240, elastic contact structure; 241, conductive contact piece; 2411, hemispherical protrusion; 242, built-in wire; 243, connection contact; 246, elastic sheet;

[0042] 300, electrical components; 400, controller; 600, sensor module. Detailed implementation manners

[0043] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0044] As Figures 1 - 9 shown, a safety performance detection device for a power distribution cabinet of the present invention, the power distribution box body 100, which is provided with a multi-layer shielding structure inside;

[0045] The sensor module 600 integrated within the power distribution box body 100 includes a voltage detection unit, a current detection unit, an insulation resistance detection unit, and a temperature and humidity detection unit;

[0046] The data processing module 200 is connected to the sensor module 600 through the elastic contact structure 240;

[0047] A heat dissipation air duct 101 is provided on the outer wall of the power distribution box body 100, which penetrates the side wall of the outer shell in a spiral shape.

[0048] The on-off of the electrical component 300 can be controlled through the controller 400.

[0049] For the power distribution box body 100, a multi-layer shielding structure is provided inside it to reduce the interference from the outside to the electrical component 300 installed inside the power distribution box body 100. The heat dissipation air duct 101 penetrates the side wall of the outer shell in a spiral shape, the duct diameter is 25 mm, and when the forced air cooling wind speed is 3 m / s, the temperature rise of the outer shell < 15K.

[0050] The sensor module 600 integrates four types of sensors (technical parameters are shown in Table 1):

[0051] Sensor type Range Accuracy Response time Voltage detection 0-1000V ±0.5% ≤10 ms Current detection 0-500A ±1% ≤20 ms Insulation resistance 0 - 10 GΩ ±2% ≤5s Temperature and humidity -50~100 °C / 0 - 100% RH ±0.5 °C / ±3% RH ≤15s

[0052] The sensor module 600 can simultaneously detect data such as the temperature, humidity, current, and voltage of the electrical component 300 inside the box. The sensor module 600 transmits the data to the data processing module 200 in real time through the elastic contact structure 240. Through the data processing module 200, the data can be collected and analyzed, and the data is transmitted to the background in real time. When the data exceeds the preset range, the data is transmitted to the background in a timely manner to help the staff discover problems in a timely manner and perform repairs in a timely manner.

[0053] As a technical optimization scheme of the present invention, the elastic contact structure 240 includes an elastic sheet 246. The elastic sheet 246 is made of highly elastic conductive rubber. One side of the elastic sheet 246 is provided with conductive contact pieces 241 arranged in a wavy shape. A hemispherical protrusion 2411 is provided at the end of the contact piece, and a composite layer is plated on the surface of the hemispherical protrusion 2411.

[0054] The conductive contact piece 241 is arranged in a wavy shape, and a hemispherical protrusion 2411 is provided at the end of the contact piece to ensure that the contact area remains greater than 80% under XYZ three-axis vibration (amplitude ±2 mm). The fractal structure reduces the contact pressure fluctuation by 35%, and the pressure standard deviation drops from ±0.8 N to ±0.5 N.

[0055] The surface of the hemispherical protrusion 2411 is coated with a Ni / Au / Pd composite coating (thickness: 2μm Ni bottom layer + 0.5μm Au + 0.3μm Pd), and surface laser microstructuring is performed (20μm diameter pits, density 200 pieces / mm²). Contact resistance: reduced from 0.8mΩ to 0.3mΩ, wear resistance: the coating life is increased from 5000 times to 20000 times.

[0056] As a technical optimization solution of the present invention, the conductive contact piece 241 is a second-order fractal corrugated structure; the main wavelength is 5mm, the secondary wavelength is 1.5mm, and the corrugation depth ratio is 1:0.6.

[0057] The original single-wave contact piece is optimized into a second-order fractal corrugated structure, and the corrugation depth ratio is adjusted from 1:1 to 1:0.6 to form a gradient deformation ability. Through finite element simulation, the maximum stress concentration point is reduced by 48% (from 12MPa → 6.2MPa), and the cyclic life is increased from 100,000 times to 500,000 times.

[0058] As a technical optimization solution of the present invention, the elastic piece 246 is inlaid with helically wound carbon fiber filaments, and the fiber direction forms a 45° angle with the deformation axis of the contact piece.

[0059] The elastic piece 246 being inlaid with helically wound carbon fiber filaments can increase the tensile strength of the elastic piece 246, and at the same time can also increase the deformation recovery rate of the elastic piece 246. The tensile strength is increased from 3MPa to 8MPa, and the deformation recovery rate is increased from 92% to 98%, which can ensure stable contact between the conductive contact piece 241 and one side of the data processing unit 230.

[0060] As a technical optimization solution of the present invention, the data processing module 200 includes a support frame 210, the support frame 210 is fixedly connected to the inner wall of the power distribution box 100, a lifting part is provided at the bottom of the support frame 210, and a data processing unit 230 is fixedly connected to the upper surface of the lifting part;

[0061] A mating contact 231 adapted to the conductive contact piece 241 is provided on one side of the data processing unit 230.

[0062] Under the elastic force of the elastic piece 246, the conductive contact piece 241 abuts against the mating contact 231 during installation. During vibration, the conductive contact piece 241 can still abut against the mating contact 231, and it is ensured that the contact area remains >80% under XYZ three-axis vibration (amplitude ±2mm), guaranteeing the stability of the connection.

[0063] As a technical optimization solution of the present invention, the support frame 210 includes an inclined guide block 214, and the elastic piece 246 is placed between the inclined guide block 214 and the data processing unit 230;

[0064] A pressing unit 220 is provided between the elastic sheet 246 and the inclined guide block 214.

[0065] The data processing unit 230 is fixedly connected to the support frame 210. Due to the pressing force of the pressing unit 220, the elastic sheet 246 and the data processing unit 230 are in a pressed state. The pressing unit 220 is made of aluminum nitride. During vibration, it will slide downward along the inclined guide block 214 to further press the elastic sheet 246. Aluminum nitride has a relatively high density, is non-conductive, and has a very high resistivity, within the range of 10−16 Ω⋅m, and is an electrical insulator; and it has a high thermal conductivity and is one of the few materials known to have electrical insulation and high thermal conductivity.

[0066] As a technical optimization scheme of the present invention, an inclined surface adapted thereto is provided on one side of the pressing unit 220 and one side of the inclined guide block 214. The pressing unit 220 is tightly arranged with the inclined guide block 214, and the pressing unit 220 is arranged in a multi-sheet shape.

[0067] The multi-sheet shape of the pressing unit 220 can play a role in heat dissipation. The pressing unit 220 can slide along the inclined surface provided on one side of the inclined guide block 214. In a vibrating environment, due to gravity, the pressing unit 220 will slide downward along the inclined surface, thereby realizing the pressing of the elastic sheet 246 on one side.

[0068] As a technical optimization scheme of the present invention, side stable guide rails 222 are slidably inserted on both sides of the pressing unit 220, and side guide grooves 212 are provided on the inner wall of the support frame 210. The side stable guide rails 222 are placed in the side guide grooves 212;

[0069] A soft guide plate 213 is provided in the side guide groove 212;

[0070] A plurality of rubber sheets 215 are provided on the inclined surface of the inclined guide block 214.

[0071] The side stable guide rails 222 provided on both sides of the pressing unit 220 can ensure the stability of the pressing unit 220 during the downward movement. During the downward movement of the pressing unit 220, the side stable guide rails 222 on both sides will move downward along the side guide grooves 212. At this time, the side stable guide rails 222 will slide relative to the pressing unit 220. A plurality of rubber sheets 215 provided on the inclined surface of the inclined guide block 214 can increase the friction force to prevent the pressing unit 220 from moving upward. The setting of the soft guide plate 213 plays a blocking role in the upward movement of the side stable guide rails 222 to ensure that the pressing unit 220 continuously presses the elastic sheet 246.

[0072] As a technical optimization solution of the present invention, the inside of the elastic sheet 246 is hollow, and a plurality of built-in wires 242 are fixedly connected to the inner wall of the elastic sheet 246. The built-in wires 242 are connected to the conductive contact piece 241 through connection contacts 243 on one side close to the conductive contact piece 241.

[0073] The elastic sheet 246 can also protect the built-in wires 242 inside. Connected to the conductive contact piece 241 through the connection contact 243, the elastic sheet 246 uses its own elasticity to tightly press the conductive contact piece 241 against the mating contact 231.

[0074] As a technical optimization solution of the present invention, the multi-layer shielding structure includes:

[0075] An outer electromagnetic shielding layer, made of a copper-nickel alloy braided mesh; the braided density of the copper-nickel alloy (Cu70 / Ni30) is 120 meshes, the thickness is 0.3 mm, and the shielding effectiveness test data is shown in Table 2:

[0076] Frequency 100 MHz 1 GHz 10 GHz SE (dB) 65 72 58

[0077] An intermediate heat insulation layer, composed of an aerogel composite material; the aerogel (SiO 2 content ≥ 95%) has a thickness of 10 mm, a thermal conductivity of 0.018 W / (m·K) (tested according to GB / T 10295), and can withstand an instantaneous thermal shock of 1000 °C (no structural damage within 5 seconds).

[0078] An inner moisture-proof layer, covered with a polytetrafluoroethylene coating; the thickness of the polytetrafluoroethylene coating is 50 μm, and the water vapor transmission rate < 0.01 g / (m²·24 h) (ASTM E96).

[0079] As a technical optimization solution of the present invention, the inner wall of the heat dissipation air duct 101 is provided with staggered guide fins, and the height of the fins is The distance between adjacent fins decreases in a gradient.

[0080] Height gradient: 5 mm at the inlet end → 3 mm at the outlet end; spacing gradient: 8 mm at the inlet → 5 mm at the outlet, spiral angle 30°, air duct diameter 25 mm, when the forced air cooling wind speed is 3 m / s, the temperature rise of the shell < 15 K (measured by an infrared thermal imager).

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety performance detection device for a power distribution cabinet, characterized in that: include: A power distribution box (100) having a multi-layer shielding structure therein; A sensor module (600) integrated in a power distribution box (100), comprising a voltage detection unit, a current detection unit, an insulation resistance detection unit, and a temperature and humidity detection unit; The data processing module (200) is connected to the sensor module (600) via an elastic contact structure (240); The outer wall of the power distribution box (100) is provided with a heat dissipation duct (101) which is spirally pierced through the side wall of the outer shell.

2. A safety performance detection device for a power distribution cabinet according to claim 1, characterized in that: The elastic contact structure (240) comprises an elastic sheet (246), the elastic sheet (246) being made of highly elastic conductive rubber, a conductive contact sheet (241) arranged in a wave shape being provided on one side of the elastic sheet (246), a hemispherical protrusion (2411) being provided at the end of the contact sheet, and a composite layer being plated on the surface of the hemispherical protrusion (2411).

3. A safety performance detection device for a power distribution cabinet according to claim 2, characterized in that: The conductive contact sheet (241) is a secondary fractal corrugated structure; the primary wavelength is 5 mm, the secondary wavelength is 1.5 mm, and the corrugation depth ratio is 1:0.

6.

4. The safety performance detection device for a power distribution cabinet according to claim 2 is characterized in that: The elastic sheet (246) is inlaid with spirally wound carbon fiber filaments, and the fiber direction forms an angle of 45° with the deformation axis of the contact sheet.

5. The safety performance detection device for a power distribution cabinet according to claim 2 is characterized in that: The data processing module (200) comprises a support frame (210), the support frame (210) being fixedly connected to the inner wall of the power distribution box (100), a lifting portion being provided at the bottom of the support frame (210), and a data processing unit (230) being fixedly connected to the upper surface of the lifting portion; A matching contact point (231) adapted to the conductive contact sheet (241) is provided on one side of the data processing unit (230).

6. A safety performance detection device for a power distribution cabinet according to claim 5, characterized in that: The support frame (210) comprises an inclined guide block (214), and the elastic sheet (246) is disposed between the inclined guide block (214) and the data processing unit (230); A tightening unit (220) is provided between the elastic sheet (246) and the inclined guide block (214).

7. A safety performance detection device for a power distribution cabinet according to claim 6, characterized in that: One side of the pressing unit (220) and one side of the inclined guide block (214) are provided with inclined surfaces matching therewith, the pressing unit (220) and the inclined guide block (214) are arranged in a pressing relationship, and the pressing unit (220) is arranged in a multi-piece shape.

8. A safety performance detection device for a power distribution cabinet according to claim 7, characterized in that: Side stabilizing guide rails (222) are slidably inserted on both sides of the abutting unit (220); side guide grooves (212) are provided on the inner wall of the support frame (210); and the side stabilizing guide rails (222) are placed in the side guide grooves (212); A soft guide plate (213) is arranged in the side guide groove (212).

9. A safety performance detection device for a power distribution cabinet according to claim 7, characterized in that: A plurality of rubber sheets (215) are provided on the inclined surface of the inclined guide block (214).

10. A safety performance detection device for a power distribution cabinet according to claim 2, characterized in that: The elastic sheet (246) is hollow inside, and a plurality of sets of built-in wires (242) are fixedly connected to the inner wall of the elastic sheet (246); the built-in wires (242) are connected to the conductive contact sheet (241) via a connection contact (243) on a side close to the conductive contact sheet (241).

11. A safety performance detection device for a power distribution cabinet according to claim 1, characterized in that: The multi-layer shielding structure comprises: The outer electromagnetic shielding layer is made of copper-nickel alloy braided mesh; The middle thermal insulation layer is made of aerogel composite material; Inner moisture barrier, covered with PTFE coating.

12. A safety performance detection device for a power distribution cabinet according to claim 1, characterized in that: The inner wall of the heat dissipation duct (101) is provided with staggered guide fins, the height of the fins being equal to the diameter of the heat dissipation duct (101). , the distance between adjacent fins decreases gradually.

Images