Ring main unit partial discharge detection device and method

Abstract

The invention discloses a ring main unit partial discharge detection device and method, and the device comprises a ring main unit body, the surface of the ring main unit body is rotatably connected with a cabinet door, and the cabinet door is fixedly provided with a safety controller and a data display. A switch equipment unit and a protection and control unit are installed in the ring main unit body. The surface of the ring main unit main body is provided with a detachable partial discharge detection mechanism. The invention aims to solve the technical problems that in the using process of an existing ring main unit, partial discharge detection on different positions of the surface of the ring main unit is inconvenient, and due to the fact that it is difficult to reach some positions for detection, the partial discharge phenomenon of the areas cannot be found in time possibly, the operation risk of electrical equipment is increased, and the reliability of the ring main unit is improved. And insulation damage or short circuit is caused.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution equipment, and in particular to a device and method for detecting partial discharge of a ring main unit. Background Art

[0002] A ring main unit (RMU) is a type of switchgear used in medium-voltage power distribution networks, primarily for power distribution and protection. It is commonly used in power supply systems for industrial, commercial, and residential areas. A RMU can provide power to loads from multiple directions, forming one or more closed-loop networks. Even if a fault occurs in one part, power can continue to be supplied to the loads through other paths, ensuring continuity and stability of the power supply. The RMU contains components such as circuit breakers, load switches, fuses, and earthing switches. These components work together to open and close circuits, and provide overload and short-circuit protection.

[0003] The partial discharge detection device for ring main units (RMUs) is a device used to monitor and assess the insulation condition of RMU equipment in power systems. Partial discharge is an electrical phenomenon occurring within or on the surface of insulating materials, signaling the onset of partial failure in the insulation system. If left uncontrolled and untreated, partial discharge can cause equipment failure and even power system accidents. This detection device detects the presence and severity of partial discharge by capturing electromagnetic or acoustic signals generated by partial discharge. When the RMU detects partial discharge, the control system within the RMU issues an alarm and trips the circuit breaker.

[0004] During the use of existing ring main units, it is not convenient to perform partial discharge detection at different locations on the surface of the ring main unit. Since it is difficult to reach certain locations for detection, partial discharge phenomena in these areas may not be discovered in time, increasing the risk of electrical equipment operation and causing insulation damage or short circuit. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that it is not convenient to perform partial discharge detection on different positions on the surface of the existing ring network cabinet during use. Since it is difficult to reach certain positions for detection, partial discharge phenomena in these areas may not be discovered in time, increasing the risk of electrical equipment operation and causing insulation damage or short circuit.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a partial discharge detection device for a ring main unit, comprising a ring main unit body, The surface of the ring network cabinet body is rotatably connected to a cabinet door, and a safety controller and a data display are fixedly installed on the cabinet door respectively; The ring main unit is equipped with a switchgear unit and a protection and control unit. A detachable partial discharge detection mechanism is installed on the surface of the ring network cabinet body.

[0007] As a preferred solution of the partial discharge detection device for a ring main unit of the present invention, the partial discharge detection mechanism includes a cover body, a handle is fixedly connected to the top of the cover body, and a control module is fixedly installed on the surface of the cover body.

[0008] As a preferred solution of the partial discharge detection device for the ring network cabinet of the present invention, the top of the inner wall of the cover is fixedly connected to a drive component, the bottom of the drive component is fixedly connected to a vacuum adsorption component, and the vacuum adsorption component is adsorbed on the surface of the ring network cabinet body.

[0009] As a preferred solution of the partial discharge detection device for a ring main unit of the present invention, mounting assemblies are installed on the left and right sides of the driving assembly, and a plurality of ultrasonic assemblies are installed on the mounting assemblies.

[0010] As a preferred solution of the partial discharge detection device of the ring network cabinet described in the present invention, the driving assembly includes a mounting seat and a support seat, the mounting seat is fixedly installed on the top of the support seat, the top of the mounting seat is fixedly connected to the top of the inner wall of the cover body, and the mounting seat and the support seat are rotatably connected to the active rod and the driven rod on the opposite sides respectively.

[0011] As a preferred solution of the partial discharge detection device for the ring main unit of the present invention, wherein: the fixed sleeve on the surface of the active rod is provided with a driving gear, the fixed sleeve on the surface of the driven rod is provided with a driven gear meshing with the driving gear, a reduction motor is fixedly installed on the top of the mounting seat, and the output shaft of the reduction motor is fixedly connected to the top of the active rod.

[0012] As a preferred solution of the partial discharge detection device for the ring network cabinet described in the present invention, the vacuum adsorption component includes a vacuum suction cup, a mounting plate is fixedly connected to the top of the vacuum suction cup, the mounting plate is fixedly connected to the bottom of the support seat, a vacuum cavity is opened at the bottom of the vacuum suction cup, a three-way solenoid valve connected to the vacuum cavity is fixedly installed on the surface of the vacuum suction cup, and a vacuum generator is connected to the three-way solenoid valve.

[0013] As a preferred solution of the partial discharge detection device of the ring network cabinet described in the present invention, wherein: the mounting assembly includes a rotating arm, the rotating arm is fixedly sleeved on the bottom of the surface of the driven rod, a slide groove is provided inside the rotating arm, and sockets connected to the slide groove are provided on the front and rear sides of the rotating arm, a long rod cam is rotatably connected to the rotating arm, a drive motor is fixedly installed on the rotating arm, and the output shaft of the drive motor is fixedly connected to one end of the long rod cam.

[0014] As a preferred solution of the partial discharge detection device of the ring network cabinet described in the present invention, wherein: the ultrasonic component includes a sliding rod, the sliding rod is located in the inner cavity of the slide groove and is movably connected thereto, a mounting screw is installed on the sliding rod, the mounting screw passes through the jack and the slide groove, a nut sleeve is provided on the threaded sleeve on the surface of the mounting screw, the bottom of the sliding rod is fixedly connected to the limit plate, the inside of the limit plate is slidably connected to the lifting rod, the top of the lifting rod is fixedly connected to the pressure plate, the pressure plate is movably connected to the surface of the long rod cam, the movable sleeve on the surface of the lifting rod is provided with a spring, the spring is located on the side opposite to the limit plate and the pressure plate, and an ultrasonic detector is fixedly installed on the bottom of the lifting rod.

[0015] A method for detecting partial discharge of a ring main unit comprises the following steps: S1. Fix and adsorb the device. Install the partial discharge detection mechanism according to the partial discharge detection position of the ring main unit. When installing the partial discharge detection mechanism, first start the vacuum adsorption component. The vacuum adsorption component forms a vacuum cavity inside the vacuum suction cup through the three-way solenoid valve and the vacuum generator, so that the vacuum suction cup is adsorbed on the surface of the ring main unit, thereby fixing the drive component and the cover, ensuring that the partial discharge detection mechanism is stably fixed on the ring main unit.

[0016] S2. Adjust the detection position. When the drive assembly is running, the output shaft of the reduction motor drives the active rod to rotate. The active gear on the top of the active rod engages with the driven gear on the surface of the driven rod, driving the driven rod to rotate synchronously, so that the ultrasonic assembly reaches the detection position. There are several driven rods and driven gears. S3: Partial discharge position detection: The rotating arm connected to the bottom of the driven rod moves with the drive assembly. The output shaft of the drive motor drives the long rod cam to rotate. The long rod cam pushes the pressure plate and the lifting rod downward. During the movement of the pressure plate, the spring is compressed. The lifting rod drives the ultrasonic detector downward so that the detection end of the ultrasonic detector can be attached to the surface of the ring main unit. S4. Ultrasonic detection and data processing. The ultrasonic detector detects leakage or insulation faults by capturing the high-frequency mechanical vibration waves generated by partial discharge. The detected signal is wirelessly transmitted to the safety controller through the control module. Combined with the operating status of the switchgear unit, the amplitude, frequency, and phase distribution parameters of the partial discharge are analyzed in real time. The data display shows the test results in real time, including PRPD graphs and trend analysis charts. If an abnormal discharge signal is detected, the safety controller triggers an early warning. When the early warning is triggered, the sound and light alarms are activated, and the staff are remotely notified, prompting the operation and maintenance personnel to take measures. S5, multi-angle coverage detection: when the detection position needs to be changed, the position of the installation component is changed by the driving component. The installation component drives several ultrasonic components to rotate, so that the ultrasonic detector can cover different positions on the surface of the ring main unit, realizing multi-angle detection. After the detection is completed, the vacuum adsorption component turns off the vacuum state, and the cover body is removed by the handle and can be moved to other parts of the ring main unit body for repeated detection. Other parts include the top, left and right sides, and front and back sides; S6. Safety and automation control. The safety controller monitors the adsorption status of the detection mechanism, the operating status of the drive component, and the signal strength of the ultrasonic detector in real time. If an abnormal situation is detected, the device operation is immediately stopped and an alarm is triggered. The control module presets the detection path and parameters, and automatically completes the adsorption, positioning, detection and data upload operations through programmed instructions, reducing human intervention.

[0017] Beneficial effects of the present invention: 1. The present invention achieves close fit between the detection mechanism and the surface of the ring network cabinet through the synergistic effect of the vacuum suction cup and the vacuum generator, ensuring stable fixation of the device under complex working conditions and avoiding displacement problems caused by vibration or environmental interference in traditional mechanical fixing methods. The reduction motor drives the gear set to drive the driven rod to rotate, and the combined structure of the rotating arm and the long rod cam realizes multi-angle positioning and precise coverage of the ultrasonic detector, significantly improving the flexibility and adaptability of the detection position.

[0018] 2. The present invention adopts a plug-in ultrasonic sensor and a protective shell structure, combined with electromagnetic shielding materials and silicone gel filling, to effectively suppress external electromagnetic interference and mechanical vibration noise, significantly improving the signal-to-noise ratio of signal acquisition. The threaded ring adjusts the height of the ultrasonic conductive plate to eliminate the influence of the air gap and ensure the efficient transmission of the ultrasonic signal. Combined with the pressure sensing function of the resistance strain ring, real-time calibration of the contact status between the sensor and the ring network cabinet surface is achieved. Through FFT spectrum analysis, power frequency phase synchronization and amplitude threshold judgment, the characteristic signal of partial discharge is accurately identified, and discharge events are distinguished from environmental noise. The detection sensitivity reaches the 20-200kHz frequency band, and the false alarm rate is significantly reduced.

[0019] 3. The present invention presets the detection path and parameters through the control module to realize the full process automation of adsorption, positioning, detection and data uploading, reduce manual intervention, and reduce the complexity of operation and maintenance. The safety controller integrates data analysis function, combines PRPD map and trend analysis, triggers sound and light alarms and remote notifications, shortens fault response time, and improves the safety of the power system. By adjusting the position of the ultrasonic component through the drive component, multi-angle coverage detection of the top, side and front and back surfaces of the ring network cabinet can be achieved, avoiding the risk of missed detection and ensuring a comprehensive assessment of the equipment status.

[0020] 4. The present invention releases residual charge by closing the grounding switch to form a visible breakpoint, which cooperates with the physical disconnection of the isolating switch to ensure the safety of maintenance personnel's operation. The relay protection device and the high-voltage fuse work together to achieve rapid disconnection of the fault current and backup protection. Combined with zero-sequence current detection and regional selective protection, only the fault section is isolated to minimize the scope of power outage. By early detection of insulation defects and timely maintenance, equipment damage caused by partial discharge is avoided, the service life of the ring network cabinet is extended, the replacement cost is reduced, the frequency of manual inspections is reduced, and combined with automated data analysis, the manpower and time investment are reduced. At the same time, through network reconstruction and coordinated control of distributed power sources, the grid operation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 is a cross-sectional view of the present invention; Figure 3 The structure of the present invention is schematically shown Figure 2 ; Figure 4 is a schematic diagram of a partial discharge detection mechanism of the present invention; Figure 5 is a cross-sectional view of a partial discharge detection mechanism of the present invention; Figure 6 is a cross-sectional view of a drive assembly of the present invention; Figure 7 Schematic diagram of the vacuum adsorption component of the present invention Figure 1 ; Figure 8 Schematic diagram of the vacuum adsorption component of the present invention Figure 2 ; Figure 9 Schematic diagram of the mounting assembly and ultrasonic assembly of the present invention Figure 1 ; Figure 10 Schematic diagram of the mounting assembly and ultrasonic assembly of the present invention Figure 2 ; Figure 11 is a schematic diagram of an ultrasonic component of the present invention; Figure 12 It is a partial cross-sectional view of the ultrasonic component of the present invention.

[0022] Figure: 1. Ring main unit; 2. Partial discharge detection mechanism; 3. Cabinet door; 4. Safety controller; 5. Data display; 6. Switchgear unit; 7. Protection and control unit; 201. Cover; 202. Handle; 203. Control module; 204. Drive assembly; 205. Vacuum adsorption assembly; 206. Mounting assembly; 207. Ultrasonic assembly; 2041. Mounting base; 2042. Support base; 2043. Reducer motor; 2044. Driven gear; 2045. Driven rod; 2046. Active rod; 2047. Active gear; 2051. Vacuum suction cup; 2052. Mounting plate; 2053. Tee Solenoid valve; 2054, vacuum generator; 2055, vacuum chamber; 2061, rotating arm; 2062, socket; 2063, long rod cam; 2064, slide; 2065, drive motor; 2071, slide; 2072, mounting screw; 2073, nut sleeve; 2074, pressure plate; 2075, spring; 2076, lifting rod; 2077, ultrasonic detector; 2078, limit plate; 2079, socket; 20710, plug; 20711, ultrasonic sensor; 20712, protective shell; 20713, resistance strain ring; 20714, ultrasonic transmission sheet; 20715, threaded ring. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example

[0024] Reference Figures 1-12 This embodiment provides a partial discharge detection device for a ring main unit, including a ring main unit body 1, a cabinet door 3 is rotatably connected to the surface of the ring main unit body 1, and a safety controller 4 and a data display 5 are fixedly installed on the cabinet door 3.

[0025] Furthermore, a switchgear unit 6 and a protection and control unit 7 are installed inside the ring main unit body 1 .

[0026] Furthermore, the switchgear unit 6 includes a load switch, a circuit breaker, an isolating switch and a grounding switch, and the protection and control unit 7 includes a high-voltage fuse, a relay protection device and an automation control system.

[0027] During the power supply stage, the load switch controls the line on and off, the circuit breaker is in the closed state to ensure current transmission, the disconnector remains connected to form a loop, and the automation control system monitors the grid parameters in real time. The grid parameters include voltage, current and temperature, and predicts potential risks through the relay protection device. The circuit breaker quickly cuts off the fault current through the tripping instruction of the relay protection device. The high-voltage fuse serves as a backup protection to melt and cut off the circuit. After the fault section is isolated, the disconnector disconnects the physical connection, and the grounding switch closes to release the residual charge, forming a visible breakpoint. The automation system locates the fault point through zero-sequence current detection and starts regional selective protection to isolate only the faulty section. During maintenance and power restoration, after the manual operation of the disconnector forms an obvious disconnection point, the grounding switch is closed to achieve double discharge to ensure maintenance safety. After the fault is eliminated, the automation system controls the sequential operation of the switchgear through logical interlocking to prevent misoperation. The automation system performs load forecasting, network reconstruction and distributed power supply coordinated control, and realizes millisecond-level fault self-healing through IED equipment.

[0028] Furthermore, a detachable partial discharge detection mechanism 2 is installed on the surface of the ring main unit 1 .

[0029] Furthermore, the partial discharge detection mechanism 2 includes a cover body 201 , a handle 202 is fixedly connected to the top of the cover body 201 , and a control module 203 is fixedly installed on the surface of the cover body 201 .

[0030] Furthermore, a driving assembly 204 is fixedly connected to the top of the inner wall of the cover body 201 , and a vacuum adsorption assembly 205 is fixedly connected to the bottom of the driving assembly 204 . The vacuum adsorption assembly 205 is adsorbed on the surface of the ring main unit 1 .

[0031] Furthermore, mounting components 206 are installed on the left and right sides of the driving component 204 , and a plurality of ultrasonic components 207 are installed on the mounting components 206 .

[0032] Furthermore, the driving assembly 204 includes a mounting seat 2041 and a support seat 2042. The mounting seat 2041 is fixedly mounted on the top of the support seat 2042. The top of the mounting seat 2041 is fixedly connected to the top of the inner wall of the cover body 201. The mounting seat 2041 and the support seat 2042 are rotatably connected to the opposite sides with an active rod 2046 and a driven rod 2045 respectively.

[0033] Furthermore, a driving gear 2047 is fixedly sleeved on the surface of the active rod 2046, and a driven gear 2044 is fixedly sleeved on the surface of the driven rod 2045 and meshed with the driving gear 2047. A reduction motor 2043 is fixedly installed on the top of the mounting seat 2041, and the output shaft of the reduction motor 2043 is fixedly connected to the top of the active rod 2046.

[0034] Furthermore, the vacuum adsorption assembly 205 includes a vacuum suction cup 2051, the top of the vacuum suction cup 2051 is fixedly connected to a mounting plate 2052, the mounting plate 2052 is fixedly connected to the bottom of the support seat 2042, a vacuum cavity 2055 is opened at the bottom of the vacuum suction cup 2051, and a three-way solenoid valve 2053 connected to the vacuum cavity 2055 is fixedly installed on the surface of the vacuum suction cup 2051, and the three-way solenoid valve 2053 is connected to a vacuum generator 2054.

[0035] Furthermore, the mounting assembly 206 includes a rotating arm 2061, which is fixedly mounted on the bottom of the surface of the driven rod 2045. A sliding groove 2064 is provided inside the rotating arm 2061, and sockets 2062 connected to the sliding groove 2064 are provided on the front and rear sides of the rotating arm 2061. A long rod cam 2063 is rotatably connected to the rotating arm 2061, and a drive motor 2065 is fixedly installed on the rotating arm 2061. The output shaft of the drive motor 2065 is fixedly connected to one end of the long rod cam 2063.

[0036] Furthermore, the ultrasonic component 207 includes a slide rod 2071, which is located in the inner cavity of the slide groove 2064 and movably connected thereto. A mounting screw 2072 is installed on the slide rod 2071, which passes through the socket 2062 and the slide groove 2064. A nut sleeve 2073 is provided on the surface of the mounting screw 2072. The bottom of the slide rod 2071 is fixedly connected to the limit plate 2078, and the limit plate 2078 is slidably connected to the inside of the lift rod 2076. The top of the lift rod 2076 is fixedly connected to the pressure plate 2074, and the pressure plate 2074 is movably connected to the surface of the long rod cam 2063. A spring 2075 is movably provided on the surface of the lift rod 2076. The spring 2075 is located on the side opposite to the limit plate 2078 and the pressure plate 2074. An ultrasonic detector 2077 is fixedly installed on the bottom of the lift rod 2076.

[0037] When the lateral position of the ultrasonic component 207 needs to be adjusted, the position of the slide rod 2071 is adjusted so that the slide rod 2071 slides in the slide groove 2064. When it is adjusted to the appropriate position, the mounting screw 2072 is inserted through the hole 2062, the slide rod 2071 and the slide groove 2064, and the nut sleeve 2073 is screwed onto the mounting screw 2072 to fix the slide rod 2071 to adjust the position of the ultrasonic detector 2077.

[0038] Furthermore, an ultrasonic sensor 20711 is installed at the bottom of the ultrasonic detector 2077, a plug 20710 is provided on the top of the ultrasonic sensor 20711, and a socket 2079 is provided at the bottom of the ultrasonic detector 2077 for use with the plug 20710. The plug 20710 is inserted into the socket 2079 and electrically connected to it.

[0039] Furthermore, the bottom of the ultrasonic detector 2077 is fixedly connected to a protective shell 20712, the ultrasonic sensor 20711 is located in the inner cavity of the protective shell 20712, the inner wall of the protective shell 20712 is threadedly connected to a threaded ring 20715, the bottom of the threaded ring 20715 is fixedly connected to an ultrasonic conductive sheet 20714, the top of the ultrasonic conductive sheet 20714 is movably connected to the detection end of the ultrasonic sensor 20711, the bottom of the ultrasonic conductive sheet 20714 is sleeved with a resistance strain ring 20713, and the bottom of the ultrasonic conductive sheet 20714 and the resistance strain ring 20713 are movably connected to the surface of the ring network cabinet body 1.

[0040] The ultrasonic sensor 20711 can be quickly installed and replaced through the plug-in connection between the plug 20710 and the socket 2079, and the electrical connection is completed simultaneously. The threaded ring 20715 is rotated to adjust the height of the ultrasonic conductive sheet 20714 to ensure that the bottom of the ultrasonic conductive sheet 20714 is in close contact with the surface of the ring network cabinet body 1, eliminating the influence of the air gap on the transmission of sound waves. The resistance strain ring 20713 senses the pressure changes on the contact surface between the ultrasonic conductive sheet 20714 and the ring network cabinet body 1 in real time. When the pressure value deviates from the set range, a calibration signal is triggered. The ultrasonic waves generated by partial discharge or mechanical vibration inside the ring network cabinet body 1 pass through the cabinet surface. The ultrasonic wave is transmitted to the ultrasonic conductive sheet 20714 and then to the detection end of the ultrasonic sensor 20711 through physical contact. The ultrasonic sensor 20711 converts the 20-200kHz ultrasonic signal into an electrical signal, which is transmitted to the ultrasonic detector 2077 through the connection channel between the plug 20710 and the socket 2079. The ultrasonic detector 2077 transmits the detection signal to the control module 203, and the control module 203 transmits the signal to the safety controller 4 for analysis. The protective shell 20712 adopts electromagnetic shielding material to block external radio interference and industrial frequency magnetic field disturbance. At the same time, the interior is filled with silicone gel to absorb mechanical vibration noise.

[0041] The ultrasonic detector 2077 detects leakage or insulation faults by capturing high-frequency mechanical vibration waves generated by partial discharge. Its core principles are as follows: When insulation defects exist within the ring main unit (RMU), such as air gaps, contamination, and cracks, the high-voltage electric field can cause partial discharge. The energy generated by this instantaneous discharge causes a violent collision with the surrounding dielectric, generating high-frequency ultrasonic signals. These signals travel through the solid dielectric (metal body of the RMU) to the surface, where they are captured by sensors. The solid dielectric is the metal body of the RMU 1.

[0042] The ultrasonic frequency band generated by partial discharge is relatively wide, but is mainly concentrated in the range of 40kHz to 100kHz, which is separated from the mechanical noise band of the ring network cabinet. In addition, partial discharge events are instantaneous, and the ultrasonic signal exhibits short pulse characteristics. The discharge source can be located by time difference. The greater the discharge energy, the higher the ultrasonic signal amplitude, which can be used to assess the severity of the discharge. The ultrasonic sensor 20711 converts the ultrasonic signal into an electrical signal, enhances the weak signal through a preamplifier, and uses a bandpass filter to filter out environmental noise. The occurrence of discharge is determined by comparing the signal amplitude with the threshold. The characteristic frequency of the discharge is identified through FFT, and combined with the power frequency phase information, the discharge event is distinguished from periodic noise. The processed signal is uploaded to the monitoring system inside the safety controller 4 to trigger an early warning or record the event. Example

[0043] Reference Figures 1-12 This embodiment provides a method for detecting partial discharge of a ring main unit, comprising the following steps: S1. Fixing and adsorbing the device. The partial discharge detection mechanism 2 is installed according to the partial discharge detection position of the ring main unit 1. When installing the partial discharge detection mechanism 2, first start the vacuum adsorption component 205. The vacuum adsorption component 205 forms a vacuum cavity 2055 inside the vacuum suction cup 2051 through the three-way solenoid valve 2053 and the vacuum generator 2054, so that the vacuum suction cup 2051 is adsorbed on the surface of the ring main unit 1, thereby fixing the drive component 204 and the cover body 201, ensuring that the partial discharge detection mechanism 2 is stably fixed on the ring main unit 1.

[0044] S2. Adjust the detection position. When the drive assembly 204 is running, the output shaft of the reduction motor 2043 drives the active rod 2046 to rotate. The active gear 2047 on the top of the active rod 2046 engages with the driven gear 2044 on the surface of the driven rod 2045, driving the driven rod 2045 to rotate synchronously, so that the ultrasonic assembly 207 reaches the detection position. There are multiple driven rods 2045 and driven gears 2044. S3. Partial discharge position detection: The rotating arm 2061 connected to the bottom of the driven rod 2045 moves with the driving assembly 204. The output shaft of the driving motor 2065 drives the long rod cam 2063 to rotate. The long rod cam 2063 pushes the pressure plate 2074 and the lifting rod 2076 to move downward. During the movement of the pressure plate 2074, the spring 2075 is compressed. The lifting rod 2076 drives the ultrasonic detector 2077 to move downward, so that the detection end of the ultrasonic detector 2077 can be attached to the surface of the ring main unit 1; S4. Ultrasonic detection and data processing. The ultrasonic detector 2077 detects leakage or insulation faults by capturing high-frequency mechanical vibration waves generated by partial discharge. The detected signal is wirelessly transmitted to the safety controller 4 through the control module 203. The amplitude, frequency, and phase distribution parameters of the partial discharge are analyzed in real time in combination with the operating status of the switchgear unit 6. The data display 5 displays the detection results in real time, including PRPD graphs and trend analysis graphs. If an abnormal discharge signal is detected, the safety controller 4 triggers an early warning. When the early warning is triggered, the sound and light alarms are activated, and the staff are remotely notified, prompting the operation and maintenance personnel to take measures. S5. Multi-angle coverage detection. When the detection position needs to be changed, the position of the installation component 206 is changed by the driving component 204. The installation component 206 drives the plurality of ultrasonic components 207 to rotate, so that the ultrasonic detector 2077 can cover different positions on the surface of the ring main unit to achieve multi-angle detection. After the detection is completed, the vacuum adsorption component 205 is turned off, and the cover body 201 is disassembled by the handle 202 and can be moved to other parts of the ring main unit body 1 for repeated detection. Other parts include the top, left and right sides, and front and back sides; S6. Safety and automation control. The safety controller 4 monitors the adsorption status of the detection mechanism 2, the operating status of the drive component 204, and the signal strength of the ultrasonic detector 2077 in real time. If an abnormal situation is detected, the device operation is immediately stopped and an alarm is triggered. The control module 203 presets the detection path and parameters, and automatically completes the adsorption, positioning, detection and data uploading operations through programmed instructions, reducing manual intervention.

Claims

1. A partial discharge detection device for a ring main unit, comprising a ring main unit body (1), characterized in that: The surface of the ring network cabinet body (1) is rotatably connected to a cabinet door (3), and a safety controller (4) and a data display (5) are respectively fixedly mounted on the cabinet door (3); A switchgear unit (6) and a protection and control unit (7) are respectively installed inside the ring network cabinet body (1); A detachable partial discharge detection mechanism (2) is mounted on the surface of the ring main unit (1).

2. The ring main unit partial discharge detection device according to claim 1, characterized in that: The partial discharge detection mechanism (2) comprises a cover body (201), a handle (202) is fixedly connected to the top of the cover body (201), and a control module (203) is fixedly mounted on the surface of the cover body (201).

3. The ring main unit partial discharge detection device according to claim 2, characterized in that: The top of the inner wall of the cover (201) is fixedly connected to a driving assembly (204), and the bottom of the driving assembly (204) is fixedly connected to a vacuum adsorption assembly (205), and the vacuum adsorption assembly (205) is adsorbed on the surface of the ring network cabinet body (1).

4. The ring main unit partial discharge detection device according to claim 3, characterized in that: Mounting components (206) are installed on the left and right sides of the driving component (204), and a plurality of ultrasonic components (207) are installed on the mounting components (206).

5. The ring main unit partial discharge detection device according to claim 4, characterized in that: The driving assembly (204) comprises a mounting seat (2041) and a support seat (2042); the mounting seat (2041) is fixedly mounted on the top of the support seat (2042); the top of the mounting seat (2041) is fixedly connected to the top of the inner wall of the cover body (201); and the mounting seat (2041) and the support seat (2042) are rotatably connected to an active rod (2046) and a driven rod (2045) on opposite sides thereof.

6. The ring main unit partial discharge detection device according to claim 5, characterized in that: A driving gear (2047) is fixedly sleeved on the surface of the active rod (2046), a driven gear (2044) meshing with the driving gear (2047) is fixedly sleeved on the surface of the driven rod (2045), a reduction motor (2043) is fixedly mounted on the top of the mounting seat (2041), and an output shaft of the reduction motor (2043) is fixedly connected to the top of the active rod (2046).

7. The ring main unit partial discharge detection device according to claim 6, characterized in that: The vacuum adsorption assembly (205) comprises a vacuum suction cup (2051), the top of the vacuum suction cup (2051) is fixedly connected to a mounting plate (2052), the mounting plate (2052) is fixedly connected to the bottom of the support seat (2042), a vacuum cavity (2055) is provided at the bottom of the vacuum suction cup (2051), a three-way solenoid valve (2053) in communication with the vacuum cavity (2055) is fixedly mounted on the surface of the vacuum suction cup (2051), and the three-way solenoid valve (2053) is in communication with a vacuum generator (2054).

8. The ring main unit partial discharge detection device according to claim 7, characterized in that: The mounting assembly (206) comprises a rotating arm (2061), the rotating arm (2061) being fixedly sleeved on the bottom of the surface of the driven rod (2045), a sliding groove (2064) being provided inside the rotating arm (2061), and sockets (2062) communicating with the sliding groove (2064) being provided on the front and rear sides of the rotating arm (2061), a long rod cam (2063) being rotatably connected to the rotating arm (2061), a driving motor (2065) being fixedly mounted on the rotating arm (2061), and an output shaft of the driving motor (2065) being fixedly connected to one end of the long rod cam (2063).

9. The ring main unit partial discharge detection device according to claim 8, characterized in that: The ultrasonic component (207) includes a slide rod (2071), the slide rod (2071) is located in the inner cavity of the slide groove (2064) and is movably connected thereto, a mounting screw rod (2072) is installed on the slide rod (2071), the mounting screw rod (2072) passes through the jack (2062) and the slide groove (2064), a nut sleeve (2073) is provided on the threaded sleeve of the mounting screw rod (2072), the bottom of the slide rod (2071) is fixedly connected to a limiting plate (2078), and the limiting plate ( 2078) is internally slidably connected to a lifting rod (2076), the top of the lifting rod (2076) is fixedly connected to a pressure plate (2074), the pressure plate (2074) is movably connected to the surface of the long rod cam (2063), a spring (2075) is movably sleeved on the surface of the lifting rod (2076), the spring (2075) is located on the side opposite to the limit plate (2078) and the pressure plate (2074), and an ultrasonic detector (2077) is fixedly installed on the bottom of the lifting rod (2076).

10. A method for detecting partial discharge of a ring main unit, applicable to the ring main unit partial discharge detection device according to claim 9, characterized in that: The following steps are involved: S1. Fixing and adsorbing the device. The partial discharge detection mechanism (2) is installed according to the partial discharge detection position of the ring network cabinet body (1). When installing the partial discharge detection mechanism (2), the vacuum adsorption component (205) is first started. The vacuum adsorption component (205) forms a vacuum cavity (2055) inside the vacuum suction cup (2051) through the three-way electromagnetic valve (2053) and the vacuum generator (2054), so that the vacuum suction cup (2051) is adsorbed on the surface of the ring network cabinet body (1), thereby fixing the driving component (204) and the cover (201), ensuring that the partial discharge detection mechanism (2) is stably fixed on the ring network cabinet body (1); S2. Adjust the detection position. When the driving assembly (204) is in operation, the output shaft of the reduction motor (2043) drives the active rod (2046) to rotate. The active gear (2047) on the top of the active rod (2046) engages with the driven gear (2044) on the surface of the driven rod (2045), driving the driven rod (2045) to rotate synchronously, so that the ultrasonic assembly (207) reaches the detection position. The number of the driven rods (2045) and the driven gears (2044) is several. S3, partial discharge position detection, the rotating arm (2061) connected to the bottom of the driven rod (2045) moves with the driving assembly (204), the output shaft of the driving motor (2065) drives the long rod cam (2063) to rotate, the long rod cam (2063) pushes the pressure plate (2074) and the lifting rod (2076) to move downward, the pressure plate (2074) compresses the spring (2075) during the movement, and the lifting rod (2076) drives the ultrasonic detector (2077) to move downward, so that the detection end of the ultrasonic detector (2077) can be attached to the surface of the ring network cabinet body (1); S4, ultrasonic detection and data processing, the ultrasonic detector (2077) detects whether there is leakage or insulation fault by capturing the high-frequency mechanical vibration wave generated by partial discharge, and the detected signal is wirelessly transmitted to the safety controller (4) through the control module (203). Combined with the operating status of the switchgear unit (6), the amplitude, frequency, and phase distribution parameters of the partial discharge are analyzed in real time. The data display (5) displays the detection results in real time. The detection results include PRPD graphs and trend analysis graphs. If an abnormal discharge signal is detected, the safety controller (4) triggers an early warning. When the early warning is triggered, the sound and light alarm works, and the staff is remotely notified to prompt the operation and maintenance personnel to take measures; S5, multi-angle coverage detection, when the detection position needs to be changed, the position of the installation component (206) is changed by the driving component (204), and the installation component (206) drives the plurality of ultrasonic components (207) to rotate, so that the ultrasonic detector (2077) can cover different positions on the surface of the ring network cabinet, realizing multi-angle detection. After the detection is completed, the vacuum adsorption component (205) is turned off, and the cover (201) is disassembled through the handle (202) and can be moved to other parts of the ring network cabinet body (1) for repeated detection, and the other parts include the top, left and right sides, and front and back sides; S6. Safety and automation control. The safety controller (4) monitors the adsorption state of the detection mechanism (2), the operating state of the drive component (204), and the signal strength of the ultrasonic detector (2077) in real time. If an abnormal condition is detected, the device operation is immediately stopped and an alarm is triggered. The control module (203) presets the detection path and parameters, and automatically completes the adsorption, positioning, detection and data uploading operations through programmed instructions, reducing manual intervention.

Images