Intelligent power distribution network terminal device test bench

Abstract

The utility model discloses a kind of intelligent power distribution network terminal device test benches, belong to power distribution network terminal test bench technical field, this intelligent power distribution network terminal device test bench, including test cabinet, the test cabinet cabinet inside installation has program-controlled three-phase power source, analog circuit breaker and aviation socket group, test cabinet workbench is equipped with electromagnetic interference component, and electromagnetic interference component includes driving mechanism, high-frequency signal generator, power amplifier, polarized antenna and central control unit.The utility model is integrated program-controlled three-phase power source, analog circuit breaker, aviation socket group and electromagnetic interference component, realized the integration operation of power distribution network terminal test, electromagnetic interference component is directly integrated in workbench, forms "fault simulation-interference test" closed loop process, avoid the signal attenuation caused by external signal source, especially suitable for evaluating terminal in harmonic, short circuit and other complex fault scene under anti-interference.

Description

Technical Field

[0001] This utility model belongs to the technical field of power distribution network terminal test benches, specifically relating to a smart power distribution network terminal device test bench. Background Technology

[0002] As the fundamental unit for distribution network monitoring and protection, distribution network terminals are widely used in substations, ring main units, pole-mounted switches, and other scenarios. Their operational reliability, real-time communication performance, and anti-interference capabilities directly affect the accuracy of fault location and the reliability of power supply. To ensure stable operation of the terminals after commissioning, their functions, performance, and immunity must be fully tested and verified in both laboratory and field environments.

[0003] Existing power distribution network terminal testing devices typically adopt a distributed structure: programmable three-phase power sources and simulated circuit breakers are set up independently, and the terminals under test are connected through temporary wiring to simulate faults such as short circuits and grounding in the power distribution network; electromagnetic interference testing relies on an external signal generator, power amplifier and antenna combination, with the antenna angle and polarization direction adjusted manually.

[0004] During the testing process of the distribution network terminal test device, the positioning deviation caused by manually adjusting the antenna angle cannot be accurately matched to the spatial layout of the terminal antenna (such as lateral radiation from the tower or high-altitude interference). Furthermore, the lack of dynamic adjustment capability of the pitch angle leads to non-repeatable test results. In the open test environment, external base stations and radio signals can easily intrude into the test link, masking the actual communication error rate and remote signal loss rate of the terminal, and affecting the accurate measurement of the delay of active fault isolation action. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a test bench for intelligent distribution network terminal devices.

[0006] The technical solution adopted to solve the above technical problems is: to provide a smart distribution network terminal device test bench, including a test cabinet, characterized in that the test cabinet is equipped with a programmable three-phase power source, a simulated circuit breaker and an aviation socket group for reproducing distribution network fault scenarios, and an electromagnetic interference component is installed on the test cabinet workbench surface; The electromagnetic interference component includes a drive mechanism, a high-frequency signal generator, a power amplifier, a polarized antenna, and a central control unit.

[0007] The above technical solution integrates a programmable three-phase power source, a simulated circuit breaker, an aviation socket group, and an electromagnetic interference component, enabling integrated operation of power distribution network terminal testing. The electromagnetic interference component is directly integrated on the workbench, forming a closed-loop process of "fault simulation - interference testing," which avoids signal attenuation caused by external signal sources. It is particularly suitable for evaluating the anti-interference capability of terminals under complex fault scenarios such as harmonics and short circuits.

[0008] Furthermore, the drive mechanism includes a drive frame fixed to the test bench surface, a horizontal annular guide rail fixed to the bottom surface of the drive frame, a rack structure axially provided on the horizontal annular guide rail, a mounting seat slidably disposed on the horizontal annular guide rail, a first servo motor fixed to the top surface of the mounting seat, a gear mounted on the output shaft of the first servo motor and meshing with the rack structure of the horizontal annular guide rail, a worm gear rotatably connected to the bottom surface of the mounting seat, a second servo motor fixed to one side of the mounting seat, a worm gear fixed to the output shaft of the second servo motor and meshing with the worm gear, a mounting plate fixed to the bottom surface of the worm gear, and a polarized antenna detachably mounted to the mounting plate by bolts.

[0009] Through the above technical solution, the full-degree-of-freedom dynamic control of the polarized antenna is achieved through the collaborative design of the horizontal ring guide rail and the worm gear mechanism. The rack structure of the horizontal ring guide rail, in conjunction with the first servo motor, supports continuous rotation from 0° to 360°, which can simulate electromagnetic interference in any direction in complex spaces such as substations and towers (such as lateral equipment radiation or high-altitude lightning pulses). The worm gear drive achieves precise positioning of the pitch angle from 0° to 90° through its self-locking characteristics, ensuring that the antenna polarization direction is completely matched with the spatial layout of the terminal antenna.

[0010] Furthermore, a micro switch is installed on the bottom surface of the drive frame above the mounting base, the top surface of the mounting base is inclined to cooperate with the roller of the micro switch, and an angle sensor is installed on one side of the mounting plate.

[0011] The above technical solution improves the system's testing accuracy through the redundant design of microswitches and tilt sensors. The microswitches are triggered by the inclined surface of the mounting base and automatically cut off the power when the antenna rotates to the starting position, completing the position calibration after one test. The tilt sensor feeds back the pitch angle data to the central control unit in real time, realizing dynamic calibration of angle deviation and ensuring that the test results under different interference angles are repeatable, providing a data basis for the quantitative evaluation of the terminal's anti-interference performance.

[0012] Furthermore, an isolation cover is provided on the workbench of the test cabinet, covering the workbench of the test cabinet, and an isolation door with a magnetic strip is provided on the front side.

[0013] Furthermore, the isolation cover is a metal shielded shell with a wave-transparent observation window on the top. The isolation door is hinged to the isolation cover and has a magnetic sealing strip on the edge to achieve an electromagnetic isolation of ≥60dB. A grounding terminal is provided on the side wall of the isolation cover, and a temperature and humidity sensor is installed on the inner wall of the isolation cover to trigger an alarm when the temperature exceeds the standard.

[0014] The above technical solution constructs a high-purity testing environment by combining a metal shielded enclosure with a magnetically sealed door and a wave-transparent observation window. This effectively blocks external interference from base stations, radio signals, and other environmental sources, ensuring that test results reflect only the terminal's own anti-interference performance. The wave-transparent window enables non-destructive observation during the test, avoiding shielding failure caused by frequent door openings. Temperature and humidity sensors monitor the internal environment in real time, triggering an alarm when the temperature exceeds 40℃ or the humidity exceeds 85%RH to prevent overheating and damage to the power amplifier, extending equipment lifespan and ensuring continuous testing.

[0015] Furthermore, the central control unit integrates an automated testing engine and a performance evaluation module; The automated testing engine can automatically match the state sequence in the test case library based on the terminal device information; The performance evaluation module can calculate the bit error rate, remote signal loss rate, and FA action delay in real time.

[0016] Through the above technical solution, the testing process is automated and the results are quantified by integrating an automated testing engine and a performance evaluation module. The engine automatically matches the state sequence in the test case library based on the terminal device information, replacing manual configuration item by item and shortening the single terminal testing time. The performance evaluation module calculates the bit error rate, remote signal loss rate and FA action delay in real time, automatically generates test reports with marked non-conforming items, and records the performance attenuation curves under different interference angles in conjunction with the tilt sensor, providing data support for the optimization of terminal antenna layout.

[0017] Furthermore, the bottom of the test cabinet is equipped with casters with brakes, and a push-pull rod is installed on one side of the test cabinet.

[0018] The above technical solution, with its braked casters and adjustable height push-pull rods, allows the device to stably traverse various terrains such as substations, warehouses, and outdoor sites, solving the problem that traditional fixed test benches cannot support on-site troubleshooting, while also meeting the need for rapid deployment between laboratories and field environments.

[0019] The beneficial effects of this utility model are as follows: By integrating a programmable three-phase power source, a simulated circuit breaker, an aviation socket group, and an electromagnetic interference component, the system achieves integrated operation for testing distribution network terminals. The electromagnetic interference component is directly integrated on the workbench, forming a closed-loop process of "fault simulation - interference testing," which avoids signal attenuation caused by external signal sources. It is especially suitable for evaluating the anti-interference capability of terminals under complex fault scenarios such as harmonics and short circuits.

[0020] The coordinated design of the horizontal ring guide rail and the worm gear mechanism enables the full-degree-of-freedom dynamic control of the polarized antenna. The rack and pinion structure of the horizontal ring guide rail, in conjunction with the first servo motor, supports continuous rotation from 0° to 360°, which can simulate electromagnetic interference in any direction in complex spaces such as substations and towers (such as lateral equipment radiation or high-altitude lightning pulses). The worm gear drive achieves precise positioning of the pitch angle from 0° to 90° through its self-locking characteristic, ensuring that the antenna polarization direction is completely matched with the spatial layout of the terminal antenna.

[0021] The redundant design of microswitches and tilt sensors simultaneously improves the system's testing accuracy. The microswitches are triggered by the inclined surface of the mounting base and automatically cut off the power when the antenna rotates to the starting position, completing the position calibration after one test. The tilt sensor feeds back the pitch angle data to the central control unit in real time, realizing dynamic calibration of angle deviation and ensuring that the test results under different interference angles are repeatable, providing a data basis for the quantitative evaluation of the terminal's anti-interference performance. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a test bench for an intelligent power distribution network terminal device according to this utility model; Figure 2 This is a three-dimensional disassembled structural diagram of a smart distribution network terminal device test bench according to this utility model; Figure 3 This is a three-dimensional structural diagram of the high-frequency signal generator of the intelligent power distribution network terminal device test bench of this utility model; Figure 4 for Figure 3 A magnified schematic diagram of the partial three-dimensional structure of A.

[0023] Reference numerals: 1. Test cabinet; 101. Programmable three-phase power source; 102. Analog circuit breaker; 103. Aviation socket assembly; 2. High-frequency signal generator; 201. Power amplifier; 202. Polarized antenna; 203. Drive frame; 204. Horizontal circular guide rail; 205. Mounting base; 206. First servo motor; 207. Turbine; 208. Second servo motor; 209. Worm gear; 210. Mounting plate; 211. Micro switch; 212. Tilt sensor; 3. Isolation enclosure; 301. Isolation door; 302. Wave-transparent observation window; 303. Temperature and humidity sensor; 4. Casters; 401. Push-pull rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] like Figure 1-4 As shown, this embodiment of a smart distribution network terminal device test bench includes a test cabinet 1. Inside the test cabinet 1 are a programmable three-phase power source 101, a simulated circuit breaker 102, and an aviation socket group 103. The central control unit is electrically connected to the programmable three-phase power source 101, which is also electrically connected to the simulated circuit breaker 102 and outputs three-phase voltage and current to it. The simulated circuit breaker 102 is electrically connected to the plug terminals of the aviation socket group 103, controlling the on / off state of the aviation socket group 103. The combination of these three components recreates a distribution network fault scenario. The distribution network terminal under test is connected to the aviation socket group 103. The standardized interface of the aviation socket group 103 directly matches the terminal communication protocol, avoiding manual wiring errors and ensuring one-time connection of power and signal channels. The test cabinet 1's workbench is equipped with an electromagnetic interference (EMI) assembly, which includes a drive mechanism, a high-frequency signal generator 2, a power amplifier 201, a polarized antenna 202, and a central control unit. The central control unit is electrically connected to the high-frequency signal generator 2, which is electrically connected to the power amplifier 201. The power amplifier 201 is electrically connected to the polarized antenna 202. The central control unit sets the output parameters of the high-frequency signal generator 2 according to the test requirements: frequency range 1MHz–2.5GHz, modulation method (80% AM amplitude modulation), and sweep step ≤1%. The signal is amplified by the power amplifier 201 to a continuously adjustable 0–50W and output to the polarized antenna 202.

[0026] The drive mechanism includes a drive frame 203 fixed to the tabletop of the test cabinet 1. A horizontal annular guide rail 204 is fixed to the bottom surface of the drive frame 203. The horizontal annular guide rail 204 has a rack structure axially arranged. A mounting base 205 is slidably arranged on the horizontal annular guide rail 204. A first servo motor 206 is fixed to the top surface of the mounting base 205. A gear is mounted on the output shaft of the first servo motor 206 and meshes with the rack structure of the horizontal annular guide rail 204. A worm gear 207 is rotatably connected to the bottom surface of the mounting base 205. A second servo motor 207 is fixed to one side of the mounting base 205. 8. A worm gear 209 is fixed to the output shaft of the second servo motor 208. The worm gear 209 meshes with a turbine 207. A mounting plate 210 is fixed to the bottom surface of the turbine 207. The polarized antenna 202 is detachably mounted to the mounting plate 210 by bolts. A micro switch 211 is mounted on the bottom surface of the drive frame 203 above the mounting base 205. The top surface of the mounting base 205 is inclined and cooperates with the roller of the micro switch 211. A tilt sensor 212 is mounted on one side of the mounting plate 210. The central control unit issues a command and starts the first servo motor 206. The drive gear meshes with the rack structure of the horizontal annular guide rail 204, driving the mounting base 205 and the polarized antenna 202 to achieve continuous rotation from 0° to 360°, simulating lateral radiation interference from substation equipment. Then, the second servo motor 208 is activated to drive the worm gear 209 to mesh with the turbine 207. The antenna elevation angle is adjusted from 0° to 90° via the mounting plate 210 to match the polarization direction of the terminal antenna. The tilt sensor 212 provides real-time angle data, with a closed-loop calibration deviation ≤ ±0.5. After the test, the mounting base 205 resets, and its top inclined surface abuts against the micro switch 211, triggering the micro switch 211 to activate the mounting base 205. The position calibration involves the first servo motor 206, the second servo motor 208, the micro switch 211, and the tilt sensor 212, all of which are electrically connected to the central control unit. An electric slip ring is installed on the bottom outer wall of the drive frame 203, and a rigid tube is fixed between the electric slip ring and the mounting base 205. The signal lines of the first servo motor 206, the second servo motor 208, and the tilt sensor 212 are electrically connected to the outer ring of the electric slip ring through the rigid tube, and the inner ring of the electric slip ring is electrically connected to the central control unit to prevent the wires from getting tangled when the mounting base 205 rotates.

[0027] An isolation cover 3 is installed on the workbench of test cabinet 1, covering the workbench surface. An isolation door 301 with a magnetic strip is located on the front. The isolation cover 3 is a metal shielded shell, with a wave-transparent observation window 302 on the top. The isolation door 301 is hinged to the isolation cover 3 and has a magnetic sealing strip on its edge, achieving an electromagnetic isolation of ≥60dB. A grounding terminal is located on the side wall of the isolation cover 3, and a temperature and humidity sensor 303 is installed on the inner wall of the isolation cover 3. An alarm is triggered when the temperature exceeds the limit. The metal shielded isolation cover 3, combined with the magnetic sealing door and the wave-transparent observation window 302, creates a high-purity testing environment. This can block external base station and radio signal interference, ensuring that the test results only reflect the terminal's own anti-interference performance. The wave-transparent window enables non-destructive observation during the test process, avoiding shielding failure caused by frequent door opening. The temperature and humidity sensor 303 monitors the internal environment in real time, triggering an alarm when the temperature >40℃ or humidity >85%RH to prevent overheating and damage to the power amplifier 201, extending equipment life and ensuring test continuity.

[0028] The central control unit integrates an automated testing engine and a performance evaluation module. The automated testing engine can automatically match the state sequence in the test case library based on the terminal device information. The performance evaluation module can calculate the bit error rate, remote signal loss rate, and FA action delay in real time. Through the integrated automated testing engine and performance evaluation module, the testing process is automated and the results are quantified. The engine automatically matches the state sequence in the test case library based on the terminal device information, replacing manual configuration item by item and shortening the single terminal testing time. The performance evaluation module calculates the bit error rate, remote signal loss rate, and FA action delay in real time, automatically generates test reports with marked non-conforming items, and records the performance attenuation curves under different interference angles in conjunction with the tilt sensor 212, providing data support for the optimization of terminal antenna layout. The bottom of the test cabinet 1 is equipped with universal wheels 4 with brake devices, and a push-pull rod 401 is installed on one side of the test cabinet 1. With the universal wheels 4 with brake devices and the adjustable height push-pull rod 401, the device can stably pass through various terrains such as substations, warehouses, and outdoor sites, solving the problem that traditional fixed test benches cannot support on-site defect elimination, while meeting the needs of rapid deployment between laboratory and field environments.

[0029] The working principle of this embodiment is as follows: the test cabinet 1 is moved to the test site by the casters 4 and the push-pull rod 401, the wheel brakes are locked in place, the magnetic isolation door 301 of the isolation cover 3 is opened, and the power distribution network terminal under test is connected to the test system through the aviation socket group 103. The standardized interface of the aviation socket group 103 directly matches the terminal communication protocol, avoiding manual wiring errors and ensuring that the power supply and signal channels are connected at one time. After the isolation door 301 is closed, the temperature and humidity sensor 303 monitors the internal environment of the isolation cover 3 in real time. If the temperature is >40℃ or the humidity is >85%RH, an audible and visual alarm is triggered and the test is suspended to prevent the power amplifier 201 from overheating and being damaged. After confirming that the environment meets the standards, the central control unit of the test cabinet 1 is started, the terminal equipment information is loaded, and the fault sequence in the test case library is automatically matched. The central control unit sets the output parameters of the high-frequency signal generator 2 according to the test requirements: frequency range 1MHz–2.5GHz, modulation method (80% AM amplitude modulation), and sweep step ≤1%. The signal is amplified by the power amplifier 201 to a continuously adjustable 0–50W and output to the polarized antenna 202. The central control unit issues a command and starts the first servo motor 206, driving the gear to mesh with the rack structure of the horizontal annular guide rail 204, thereby driving the mounting base 205 and the polarized antenna 202 to achieve continuous rotation from 0° to 360°, simulating lateral radiation interference from substation equipment. Then, the second servo motor 208 is started, driving the worm gear 209 to mesh with the turbine 207, adjusting the antenna elevation angle from 0° to 90° via the mounting plate 210 to match the polarization direction of the terminal antenna. The tilt sensor 212 provides real-time angle data, with a closed-loop calibration deviation ≤ ±0.5. After the test, the mounting base 205 resets, and its top inclined surface abuts against the micro switch 211, triggering the micro switch 211 to calibrate the position of the mounting base 205. The programmable three-phase power source 101 outputs fault waveforms according to preset test cases, while simulating the circuit breaker 102 to perform opening and closing operations, reproducing the short circuit and ground fault scenarios of the distribution network. The fault signal is transmitted to the terminal through the aviation socket group 103 to verify its protection logic response. During this stage, the high-frequency signal generator 201 is turned off to avoid noise interference. During the fault simulation, the polarized antenna 202 radiates radio frequency interference at a specified angle and intensity. The central control unit synchronously injects conducted interference such as a 150kHz–80MHz frequency sweep, which is coupled to the terminal power line through current clamping to simulate the superposition effect of radiated and conducted interference in the real environment. Operators monitor the terminal's operational status, such as indicator light flashing and screen display, through the transparent observation window 302. The performance evaluation module collects terminal communication data in real time and calculates the bit error rate (BER), remote signaling loss rate threshold (<0.1%), and FA action delay threshold (<100ms). The data is stored in association with interference angle and intensity parameters, generating a dynamic attenuation curve, such as the FA delay rising to 150ms under 27MHz interference. After the test, the central control unit automatically integrates the data and outputs an evaluation report including failure frequencies, such as remote signaling loss at 1.2GHz, and interference angle sensitivity, such as the peak BER at 60° elevation.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A test bench for a smart distribution network terminal device, comprising a test cabinet (1), characterized in that, The test cabinet (1) is equipped with a programmable three-phase power source (101), a simulated circuit breaker (102) and an aviation socket group (103) to reproduce the fault scenario of the power distribution network. The test cabinet (1) is equipped with an electromagnetic interference component on its workbench. The electromagnetic interference component includes a drive mechanism, a high-frequency signal generator (2), a power amplifier (201), a polarized antenna (202), and a central control unit.

2. The intelligent distribution network terminal device test bench according to claim 1, characterized in that, The drive mechanism includes a drive frame (203) fixed on the test cabinet (1) table. A horizontal annular guide rail (204) is fixed on the bottom surface of the drive frame (203). A rack structure is provided axially on the horizontal annular guide rail (204). A mounting seat (205) is slidably arranged on the horizontal annular guide rail (204). A first servo motor (206) is fixed on the top surface of the mounting seat (205). A gear is installed on the output shaft of the first servo motor (206) and meshes with the rack structure of the horizontal annular guide rail (204). A turbine (207) is rotatably connected to the bottom surface of the mounting seat (205). A second servo motor (208) is fixed on one side of the mounting seat (205). A worm gear (209) is fixed on the output shaft of the second servo motor (208). The worm gear (209) meshes with the turbine gear (207). A mounting plate (210) is fixed on the bottom surface of the turbine gear (207). The polarized antenna (202) is detachably installed on the mounting plate (210) by bolts.

3. The intelligent distribution network terminal device test bench according to claim 2, characterized in that, A micro switch (211) is installed on the bottom surface of the drive frame (203) and above the mounting base (205). The top surface of the mounting base (205) is inclined and cooperates with the roller of the micro switch (211). An angle sensor (212) is installed on one side of the mounting plate (210).

4. The intelligent distribution network terminal device test bench according to claim 3, characterized in that, An isolation cover (3) is provided on the workbench of the test cabinet (1). The isolation cover (3) covers the workbench of the test cabinet (1), and an isolation door (301) with a magnetic strip is provided on the front side.

5. A smart distribution network terminal device test bench according to claim 4, characterized in that, The isolation cover (3) is a metal shielded shell with a wave-transparent observation window (302) on the top. The isolation door (301) is hinged to the isolation cover (3) and a magnetic sealing strip is provided on the edge to achieve an electromagnetic isolation of ≥60dB. The isolation cover (3) is provided with a grounding terminal on the side wall and a temperature and humidity sensor (303) is installed on the inner wall of the isolation cover (3). An alarm is triggered when the temperature exceeds the standard.

6. The intelligent distribution network terminal device test bench according to claim 5, characterized in that, The central control unit integrates an automated testing engine and a performance evaluation module; The automated testing engine can automatically match the state sequence in the test case library based on the terminal device information; The performance evaluation module can calculate the bit error rate, remote signal loss rate, and FA action delay in real time.

7. A smart distribution network terminal device test bench according to claim 6, characterized in that, The bottom of the test cabinet (1) is equipped with casters (4) with brakes, and a push-pull rod (401) is installed on one side of the test cabinet (1).

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