12kv digital primary and secondary fusion ring network box

Abstract

The present application relates to the technical field of ring network box equipment, in particular to a 12kV digital primary and secondary fusion ring network box, which comprises a ring network box body, a digital sensing unit, a digital main control unit, a ring network unit and a measurement and control integrated voltage transformer installed in the ring network box body, the digital sensing unit, the digital main control unit, the ring network unit and the measurement and control integrated voltage transformer are connected through a primary and secondary connection cable, and a recloser is further arranged in the ring network box body, and a lever of the recloser is connected with a detection device. The present application realizes information interaction between the digital sensing unit, the digital main control unit and a master station, reduces a large number of connecting parts and insulating parts after adopting a digital architecture, simplifies the product structure, realizes miniaturization, reduces carbon emissions in the transportation link, and promotes the development of power distribution equipment towards green and low carbon.

Description

Technical Field

[0001] This invention relates to the field of ring main unit equipment technology, specifically to a 12kV digital primary and secondary integrated ring main unit. Background Technology

[0002] The integrated primary and secondary ring main unit (RMM) is a highly integrated power device for smart distribution networks. It is a compact, intelligent, and efficient distribution unit built by deeply integrating traditionally distributed primary and secondary equipment. Currently, there are no relevant domestic standards to provide technical specifications for RMMs to guide their development towards green and low-carbon directions. Approximately 50,000 outdoor RMMs are used annually in China, consuming large quantities of steel, control cables, plastics, etc. The production process of these devices generates significant carbon emissions. Furthermore, RMMs require extensive functional testing during production. Automatic reclosing function testing is a crucial test of the RMM's safety performance. This requires simulating fault scenarios, accurately acquiring signals, and synchronously recording key nodes to systematically record the action process and timing parameters of the first trip and the first reclosing. While a time recorder is typically used to synchronously record the action moments, the reclosing trip process involves the linkage of mechanical action and electrical signals, but these are not perfectly synchronized. Therefore, the time recorder may not accurately reflect the actual moment of the mechanical trip. Summary of the Invention

[0003] To address the aforementioned technical shortcomings, the present invention aims to provide a 12kV digital primary and secondary integrated ring main unit, comprising a ring main unit enclosure, and digital sensing units, digital main control units, ring main units, and integrated measurement and control voltage transformers installed within the ring main unit enclosure. All external interfaces of the digital sensing units, digital main control units, and ring main units adopt aviation plug interfaces. The digital sensing units, digital main control units, ring main units, and integrated measurement and control voltage transformers are connected via primary and secondary connection cables. A reclosing device is also installed within the ring main unit enclosure. The side wall of the ring main unit enclosure has an opening facing the outside of the enclosure, and the reclosing device is installed within this cavity. A through hole is provided inside the cavity, and the reclosing device's arm is connected to a detection device located within the cavity.

[0004] To address the issue of accurately detecting the motion response speed of the reversing gate arm during reclosing tripping, the following features are specifically incorporated: The detection device includes a housing installed on the side wall of the ring main unit and covering the opening of the mounting cavity. The housing contains several detection seats corresponding to the reclosing circuit. Each detection seat has a vertical groove, within which a lifting seat is slidably mounted. A horizontal bushing is mounted on the lifting seat, and a shaft is slidably mounted within the bushing. A connector is located at the end of the shaft facing the ring main unit, and this connector is fitted onto the reclosing gate arm. A sensing unit is located at the bottom of each detection seat, below the lifting seat, and detects the vertical height change and speed of the lifting seat.

[0005] To ensure the accuracy of the sensing unit's detection position, the following features are specifically designed: the sensing unit includes a laser rangefinder and a target; a positioning seat is provided at the bottom of the detection seat; the laser rangefinder is coaxially mounted in the positioning seat and keeps the detection end vertically upward; the target is mounted at the bottom of the lifting seat and is located directly above the detection end of the laser rangefinder.

[0006] To avoid external light affecting the detection of the sensing unit and to ensure that the reclosing is in a closed environment, the following features are specifically provided: the detection base is provided with hanging ears on the upper and lower sides, and the detection base is installed on the housing by the hanging ears and bolts.

[0007] The outer casing is covered by a shell that covers all the detection seats.

[0008] In order to enable the reclosing reset operation to be performed outside the housing, the following features are specifically provided: a number of reset sliders are slidably installed outside the housing, each reset slider is synchronously connected to the lifting seat on the detection seat, and the side of the reset slider facing the inside of the housing is provided with an insertion hole, and the bushing of the lifting seat is inserted into the insertion hole.

[0009] The cover is provided with a clearance hole for avoiding the bushing. The clearance hole extends vertically and the width of the clearance hole is not less than the outer diameter of the bushing.

[0010] To reduce the impact on the response speed of reclosing tripping, the following features are specifically designed: several vertical limit slide rails are provided on the outer side of the housing, and the reset slider is slidably installed in the limit slide rails.

[0011] To improve safety, the following feature is specifically designed: an insulating push handle is provided on the outside of the reset slider.

[0012] To prevent the clearance hole on the cover from being exposed when the reset slider moves with the gate arm, the following features are specifically provided: sealing plates are provided on the upper and lower sides of the reset slider, and the sealing plates fit against the outer wall of the cover and seal the clearance hole.

[0013] The advantages of this invention compared to the prior art are:

[0014] Firstly, in this invention, each electrical component unit within the ring main unit is digitized by a digital sensing unit that collects analog voltage and current quantities and status quantities within the unit, and receives digital commands to control the operating mechanism. The digital main control unit collects analog bus voltage quantities and cabinet status quantities, receives digital quantities from the digital sensing unit, issues control commands, and interacts with the main station. By adopting a digital architecture, a large number of connectors and insulation components can be reduced, simplifying the product structure and achieving miniaturization. At the same time, carbon emissions in the transportation process are reduced, promoting the development of power distribution equipment towards a green and low-carbon direction.

[0015] Secondly, the detection device in this invention avoids the limitations of traditional time recorders that rely on electrical contact signals through direct mechanical coupling between the connector and the reclosing gate arm. It solves the problem of time recording deviation caused by the asynchrony between electrical signals and mechanical actions, and significantly improves the accuracy and reliability of detecting the reclosing trip action time and process parameters.

[0016] Thirdly, the insertion and fitting of the reset slider and the bushing in this invention enables convenient external reset of the reclosing circuit, which can be operated without opening the cover. This ensures that the sensing unit is always in a closed environment to isolate external light interference and simplifies the reset process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a 3D view of a 12kV digital primary and secondary integrated ring network box.

[0019] Figure 2 This is an exploded three-dimensional structure diagram of a 12kV digital primary and secondary integrated ring main unit.

[0020] Figure 3 for Figure 2 A magnified view of part A.

[0021] Figure 4 A three-dimensional diagram of the reclosing and detection device of a 12kV digital primary and secondary integrated ring main unit.

[0022] Figure 5 This is a front view of the reclosing and detection device of a 12kV digital primary and secondary integrated ring network box.

[0023] Figure 6 for Figure 5 Sectional view of section BB.

[0024] Figure 7 for Figure 5 A three-dimensional sectional view of BB.

[0025] Figure 8 for Figure 7 A magnified view of a portion of point C.

[0026] Figure 9 An exploded three-dimensional view of the reclosing and detection device of a 12kV digital primary and secondary integrated ring network box.

[0027] Figure 10 for Figure 9 A magnified view of a portion of point D.

[0028] Explanation of reference numerals in the attached drawings: 1. Ring network box housing; 1a. Digital sensing unit; 1b. Digital main control unit; 1c. Ring network unit; 1d. Integrated voltage transformer for measurement and control; 1e. Reclosing device; 2a. Detection device; 2a1. Enclosure; 2a2. Reset slider; 2a3. Insertion hole; 2a4. Clearance hole; 2a5. Limiting slide rail; 2a6. Insulating push handle; 2a7. Sealing plate; 2b. Detection seat; 2b1. Slide groove; 2b2. Positioning seat; 2b3. Hanging lug; 2c. Lifting seat; 2c1. Bushing; 2c2. Shaft; 2c3. Connector; 2d. Sensing unit; 2d1. Laser rangefinder sensor; 2d2. Target. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figures 1 to 10 :

[0031] The 12kV digital primary and secondary integrated ring main unit includes a ring main unit box 1, and digital sensing units 1a, digital main control units 1b, ring main units 1c, and integrated measurement and control voltage transformers 1d installed inside the ring main unit box 1. The external interfaces of digital sensing units 1a, digital main control units 1b, and ring main units 1c all adopt aviation plug interfaces. Digital sensing units 1a, digital main control units 1b, ring main units 1c, and integrated measurement and control voltage transformers 1d are connected through primary and secondary connection cables. A reclosing device 1e is also provided inside the ring main unit box 1. The side wall of the ring main unit box 1 is provided with an installation cavity with an opening facing the outside of the ring main unit box 1. The reclosing device 1e is installed in the installation cavity. The inner side of the installation cavity is provided with a through hole. The reclosing device 1e is installed in the installation cavity. The gate arm of the reclosing device 1e is connected to the detection device 2 provided in the installation cavity.

[0032] The ring main unit 1 of the 12kV digital primary and secondary integrated ring main unit in this application can be made of stainless steel and GRC materials, or SMC (saturated polyvinyl chloride) material, to ensure that it meets the mechanical strength requirements. The power supply is provided by an integrated measurement and control voltage transformer 1d at AC 220V, using a VV structure. Its power supply should simultaneously support the normal operation of the digital sensing unit 1a, the digital main control unit 1b, the ring main unit 1c, and other communication equipment. Each electrical component unit within the ring main unit 1 is digitized by the digital sensing unit 1a, which collects analog voltage and current values ​​and status values ​​within its unit and receives digital commands to control the operating mechanism. The digital main control unit 1b collects analog bus voltage values ​​and cabinet status values, receives digital values ​​from the digital sensing unit 1a, issues control commands, and interacts with the main station. The digital sensing unit 1a and the digital main control unit 1b use 304 stainless steel housings, and all external interfaces use aviation connectors. The overall protection level of digital sensing unit 1a and digital main control unit 1b meets the relevant requirements of IP65 protection level in GB / T4208. The digital bus between digital sensing unit 1a and digital main control unit 1b uses an RJ45 interface. One digital main control unit 1b has the ability to communicate with at least six digital sensing units 1a. The digital bus interface on the digital main control unit 1b should have a hub function. Digital sensing units 1a can be plugged into any bus interface of the digital main control unit 1b without requiring parameter reconfiguration. The transmission speed of the digital bus general frame is 10 Mbit / s, using Manchester encoding, with the most significant bit first and the least significant bit last. The Manchester encoding rule is: transitioning from the least significant bit to the most significant bit results in a binary 1, and transitioning from the most significant bit to the least significant bit results in a binary 0. The external interface of the ring network unit 1c also uses an aviation plug interface. Its analog quantities, status quantities, and control signals do not pass through the secondary room terminal block for conversion. In this embodiment, the output capacity (purely resistive load) of the control circuit contacts of the digital sensing unit 1a should preferably be no less than DC 48V / 10A. The digital sensing unit 1a should have at least two RS485 communication ports. The digital sensing unit 1a should have at least one digital bus communication interface for communication with the digital main control unit 1b. The sampling frequency of the digital sensing unit 1a should be no less than 12.8kHz. The time synchronization error of the digital main control unit 1b should be no greater than 5ms. The timekeeping error should be no greater than 1 second / day. The digital main control unit 1b should have at least three Ethernet ports, one dedicated maintenance serial port, two RS232 ports, and two RS485 communication ports. The SOE resolution of the digital main control unit 1b should be no greater than 2ms. The voltage, current, active power, and reactive power accuracy of the digital main control unit 1b should be 0.5 class. The digital main control unit 1b should be configured with at least 4 aviation plug interfaces to communicate with the sensing units via the FT3 protocol. Each aviation plug interface connects to 2 digital sensing units 1a, and a maximum of 8 digital sensing units 1a can be connected.The sampling frequency of the digital main control unit 1b shall not be less than 12.8kHz. The digital main control unit 1b shall have at least 6 simultaneous waveform recording capabilities. The recorded waveforms shall include waveform data for at least 4 cycles before the fault occurrence and at least 8 cycles after the fault occurrence, with a recording point count of at least 80 points / cycle. The recorded waveform data shall include voltage, current, switch position, etc. At least 64 sets of recorded waveform data shall be cyclically stored and uploaded to the main station. The relative errors of the steady-state recorded voltage amplitude are: 0.05Un≤5.0%, 0.1Un≤2.5%, 0.5Un≤1.0%, 1.0Un≤0.5%, 1.5Un≤1.0%. The relative errors of the steady-state recorded current amplitude are: 0.1In≤5.0%, 0.2In≤2.5%, 0.5In≤1.0%, 1.0In≤0.5%, 5.0In≤1.0%, 10In≤2.5%. The instantaneous error of the maximum peak value in the transient recording should not exceed 10%. The inherent operating time of the digital main control unit 1b should be less than 40ms. The current setting error of the digital main control unit 1b should not exceed 0.02In in the absolute error range of 0.05In to 1.2In; and should not exceed 5% in the relative error range of 1.2In to 10In. The delay time setting error of the digital main control unit 1b should not exceed 1% or 40ms when the setting value is 1.2 times. The voltage harmonics and total distortion of the digital main control unit 1b are as follows: harmonic content ≥1%Un, error ±5%Uh; harmonic content <1%Un, error ±0.05%Un; current harmonics and total distortion are as follows: harmonic content ≥3%In, error ±5%Ih; harmonic content <3%In, error ±0.15%In; 8T / CES9 (Note: Un: nominal voltage; In: nominal current; Uh and Ih are measured values, h represents the harmonic order). The voltage imbalance of the digital main control unit 1b is ±0.15%; the current imbalance is ±1%; the frequency deviation is ±0.01Hz; the voltage deviation is ±0.5%; the voltage fluctuation and flicker are ±5%; the aviation plug interfaces on the digital sensing unit 1a, digital main control unit 1b, and ring network unit 1c facilitate the insertion and removal of primary and secondary connection cables and have locking, anti-disconnection, and anti-misinsertion functions. This embodiment utilizes a digital sensing unit 1a, a digital main control unit 1b, a ring network unit 1c, an integrated measurement and control voltage transformer 1d, and primary and secondary connection cables to achieve local digital processing of analog current (or analog line voltage) and remote signaling in the secondary compartment of the PT bay, and local digital processing of analog voltage in the secondary compartment of the PT bay cabinet. It also features phase-to-phase short-circuit fault detection, judgment, and recording functions, and supports uploading phase-to-phase short-circuit fault events; supports waveform data storage, and can respond to the master station's request for waveform data. Furthermore, it possesses ground fault detection, judgment, and recording functions under different neutral point grounding methods, and supports uploading ground fault events; it should support waveform data storage and can respond to the master station's request for waveform data.It features local fault clearing capability, directly clearing phase-to-phase short-circuit faults and grounding faults. It also features alarm transmission capabilities for voltage and load over-limit conditions. The presence of reclosing 1e enables automatic reclosing in this embodiment, with adjustable reclosing times and timings; it also features a reclosing interlock function. Furthermore, it possesses asynchronous acquisition and synchronous calculation capabilities to calculate active and reactive power, as well as the forward and reverse active energy, forward and reverse reactive energy, and four-quadrant reactive energy for each bay, along with an energy freezing function. The 12kV digital primary and secondary integrated ring main unit of this application undergoes power frequency voltage testing, lightning impulse immunity testing, transformer accuracy testing, power supply load capacity testing, and automatic reclosing function testing. During the automatic reclosing function testing, upon the initial application of fault voltage and current, the ring main unit should trip for the first time, and the reclosing 1e reset timer should be initiated. The first reclosing should be performed according to the reclosing 1e setting, and the correctness and timing of the first trip and reclosing action of the ring main unit should be recorded. This process is repeated multiple times. In this embodiment, the reclosing circuit 1e is located in the mounting cavity on the side wall of the ring network box 1. The detection device 2 at the mounting cavity is used to quickly and accurately record the tripping response speed of the reclosing circuit 1e.

[0033] To address the issue of how detection device 2 can accurately detect the motion response speed of the flipped gate arm when reclosing 1e trips, the following features are specifically designed:

[0034] The detection device 2 includes a housing 2a installed on the side wall of the ring network box 1 and covering the opening of the installation cavity. The housing 2a contains several detection seats 2b corresponding to the reclosing gate 1e. The detection seats 2b are provided with vertical sliding grooves 2b1. Lifting seats 2c are slidably installed in the sliding grooves 2b1. Horizontal bushings 2c1 are provided on the lifting seats 2c. A shaft 2c2 is slidably installed in the bushings 2c1. A connector 2c3 is provided at the end of the shaft 2c2 facing the ring network box 1. The connector 2c3 is sleeved on the gate arm of the reclosing gate 1e. A sensing unit 2d is provided at the bottom of the detection seat 2b. The sensing unit 2d is located below the lifting seats 2c and detects the vertical height change and speed of the lifting seats 2c.

[0035] Reference Figures 3 to 7In this embodiment, when the reclosing gate 1e of the primary and secondary fusion ring network box performs a tripping action, the gate arm of the reclosing gate 1e rotates, and drives the shaft 2c2 to move synchronously through the connector 2c3 sleeved on the gate arm. The shaft 2c2 adjusts its position horizontally in the bushing 2c1 to match the displacement direction of the gate arm, and at the same time drives the lifting seat 2c to slide vertically in the slide groove 2b1 of the detection seat 2b. The sensing unit 2d at the bottom of the detection seat 2b captures the vertical height change and moving speed of the lifting seat 2c in real time, converts the displacement signal of the mechanical action into an electrical signal and records it, thereby completely recording the start time, process parameters and completion time of the gate arm mechanical action when the reclosing gate 1e trips, realizing direct detection of the mechanical tripping process of the reclosing gate. In this embodiment, the direct mechanical coupling between the connector 2c3 and the gate arm of the reclosing gate 1e avoids the limitations of traditional time recorders that rely on electrical contact signals, solves the problem of time recording deviation caused by the asynchrony between electrical signals and mechanical actions, and significantly improves the accuracy and reliability of the detection of the reclosing tripping action time and process parameters. Meanwhile, the integrated design of the housing 2a and the detection seat 2b allows the device to be compactly embedded in the ring network box 1, reducing the additional consumables of traditional distributed detection instruments and meeting the needs of green and low-carbon development.

[0036] To ensure the accuracy of the 2D detection position of the sensing unit, the following features are specifically designed:

[0037] The sensing unit 2d includes a laser rangefinder 2d1 and a target 2d2. A positioning seat 2b2 is provided at the bottom of the detection seat 2b. The laser rangefinder 2d1 is coaxially installed in the positioning seat 2b2 and the detection end is kept vertically upward. The target 2d2 is installed at the bottom of the lifting seat 2c and is located directly above the detection end of the laser rangefinder 2d1.

[0038] Reference Figure 8 In this embodiment, the gate arm drives the shaft 2c2 and the lifting seat 2c to move vertically along the slide groove 2b1 via the connector 2c3. At this time, the target 2d2 installed at the bottom of the lifting seat 2c moves synchronously with the lifting seat 2c. The laser range sensor 2d1 in the positioning seat 2b2 at the bottom of the detection seat 2b keeps the detection end vertically upward and continuously emits laser signals to the target 2d2 directly above. By receiving the reflected signals, the distance change of the target 2d2 is calculated in real time, thereby accurately capturing the vertical height change, moving speed and instantaneous position of the lifting seat 2c, realizing dynamic monitoring of the mechanical movement of the gate arm of the reclosing gate 1e.

[0039] To prevent external light from affecting the detection of the sensing unit 2d and to ensure that the reclosing circuit 1e is in a closed environment, the following features are specifically designed:

[0040] The detection seat 2b has hanging ears 2b3 on both the upper and lower sides. The detection seat 2b is installed on the housing 2a by the hanging ears 2b3 and bolts.

[0041] The outer casing 2a is provided with a cover 2a1 that covers all the detection seats 2b.

[0042] Reference Figures 4 to 9 In this embodiment, the detection seat 2b is fixed to the housing 2a by the upper and lower hanging ears 2b3 and bolts, ensuring the stability of the sliding trajectory of the lifting seat 2c in the slide groove 2b1. The outer shell 2a1 of the housing 2a completely covers all the detection seats 2b, forming a closed space, which isolates the core components of the sensing unit 2d such as the laser range sensor 2d1 and the target 2d2 from the external environment. This not only avoids the interference of external light on the laser sensing, but also keeps the reclosing switch 1e and the detection components in a closed environment, preventing dust, moisture and other factors from affecting the operation of the equipment. At the same time, it enhances the integrated sealing of the housing 2a, which meets the safety requirements of the closed operation of the ring network box.

[0043] In order to allow the reclosing 1e to be reset outside the housing 2a1, the following features are specifically provided:

[0044] Several reset sliders 2a2 are slidably installed on the outside of the cover 2a1. Each reset slider 2a2 is synchronously connected to the lifting seat 2c on the detection seat 2b. The reset slider 2a2 has an insertion hole 2a3 on the side facing the inside of the sleeve 2a. The bushing 2c1 of the lifting seat 2c is inserted into the insertion hole 2a3.

[0045] The cover 2a1 is provided with a clearance hole 2a4 for avoiding the bushing 2c1. The clearance hole 2a4 extends in the vertical direction and the width of the clearance hole 2a4 is not less than the outer diameter of the bushing 2c1.

[0046] Reference Figures 4 to 10 In this embodiment, when a reset operation is required for the reclosing circuit 1e, the operator pushes the reset slider 2a2 outside the housing 2a1. Since the reset slider 2a2 is inserted into the bushing 2c1 of the lifting seat 2c through the insertion hole 2a3, the movement of the slider will drive the bushing 2c1 and the lifting seat 2c to move synchronously. The bushing 2c1 slides along the vertical clearance hole 2a4 on the housing 2a1, ensuring that the lifting seat 2c is smoothly reset in the slide groove 2b1, and then drives the gate arm of the reclosing circuit 1e back to the initial position through the connector 2c3. In this embodiment, the insertion and cooperation of the reset slider 2a2 and the bushing 2c1 realizes the convenient external reset of the reclosing circuit 1e, which can be operated without opening the housing 2a1. This ensures that the sensing unit 2d is always in a closed environment to isolate external light interference and simplifies the reset process.

[0047] To reduce the impact on the tripping response speed of reclosing 1e, the following features are specifically configured:

[0048] Several vertical limiting slide rails 2a5 are provided on the outside of the cover 2a1, and the reset slider 2a2 is slidably installed in the limiting slide rails 2a5.

[0049] Reference Figure 10 In this embodiment, the reset slider 2a2 is installed inside the limit slide rail 2a5. The limit slide rail 2a5 provides precise guiding constraints for the reset slider 2a2, avoiding additional friction or jamming caused by lateral offset when the reset slider 2a2 moves with the reclosing arm 1e, and significantly reducing the impact on the reclosing trip response speed.

[0050] To enhance security, the following features have been specifically implemented:

[0051] An insulating push handle 2a6 is provided on the outside of the reset slider 2a2.

[0052] Reference Figures 5 to 10 In this embodiment, the insulating push handle 2a6 located outside the reset slider 2a2 prevents workers from getting electric shock when operating the reset slider 2a2 to reset, thus improving the safety of equipment operation.

[0053] To prevent the clearance hole 2a4 on the cover 2a1 from being exposed when the reset slider 2a2 moves with the gate arm, the following features are specifically provided:

[0054] The upper and lower sides of the reset slider 2a2 are provided with sealing pieces 2a7, which fit against the outer wall of the cover 2a1 and block the clearance hole 2a4.

[0055] Reference Figures 6 to 10 When the reclosing arm of the reclosing circuit 1e drives the reset slider 2a2 to move vertically along the limit rail 2a5, the sealing plates 2a7 on both the upper and lower sides of the reset slider 2a2 always keep in contact with the outer wall of the housing 2a1 and move synchronously. Since the sealing plates 2a7 cover the corresponding area of ​​the clearance hole 2a4, no matter where the reset slider 2a2 moves, the sealing plates 2a7 can block the exposed part of the clearance hole 2a4, preventing external light and dust from entering the interior of the housing 2a1 through the clearance hole 2a4, and ensuring that the sensing unit 2d is always in a closed and interference-free environment.

[0056] Working principle: Each electrical component unit within the ring main unit 1 is digitized by digital sensing unit 1a, which collects analog voltage and current values ​​and status values ​​within its unit and receives digital commands to control the operating mechanism. The digital main control unit 1b collects analog bus voltage values ​​and cabinet status values, receives digital values ​​from digital sensing unit 1a, issues control commands, and interacts with the main station. The ring main unit undergoes power frequency voltage testing, lightning impulse immunity testing, transformer accuracy testing, power supply load capacity testing, and automatic reclosing function testing. During automatic reclosing function testing, reclosing 1e trips, causing the reclosing arm to rotate. This rotation, via connector 2c3 mounted on the arm, drives shaft 2c2 to move synchronously. Shaft 2c2 is horizontally adjusted in bushing 2c1 to match the arm's displacement direction, simultaneously causing lifting seat 2c to slide vertically within the groove 2b1 of testing seat 2b. The sensing unit 2d at the bottom of the detection seat 2b captures the vertical height change and moving speed of the lifting seat 2c in real time, converts the displacement signal of the mechanical action into an electrical signal and records it, thereby completely recording the start time, process parameters and completion time of the mechanical action of the gate arm when the reclosing 1e trips, realizing direct detection of the mechanical tripping process of the reclosing.

[0057] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

A 1.12kV digital integrated primary and secondary ring main unit, characterized in that, The system includes a ring main unit (1), and a digital sensing unit (1a), a digital main control unit (1b), a ring network unit (1c), and a measurement and control integrated voltage transformer (1d) installed inside the ring main unit (1). All external interfaces of the digital sensing unit (1a), digital main control unit (1b), and ring network unit (1c) use aviation connectors. The digital sensing unit (1a), digital main control unit (1b), ring network unit (1c), and measurement and control integrated voltage transformer (1d) are connected via primary and secondary connection cables. A reclosing device (1e) is also installed inside the ring main unit (1). The side wall of the ring main unit (1) has an opening facing the outside of the ring main unit (1). The reclosing device (1e) is installed inside the installation cavity, and a through hole is provided inside the installation cavity. The gate arm of the reclosing device (1e) is connected to a detection device (2) installed in the installation cavity. The detection device (2) includes a housing (2a) installed on the side wall of the ring network box (1) and covering the opening of the installation cavity. The housing (2a) is provided with a plurality of detection seats (2b) corresponding to the reclosing gate (1e). The detection seats (2b) are provided with vertical sliding grooves (2b1). A lifting seat (2c) is slidably installed in the sliding grooves (2b1). A horizontal bushing (2c1) is provided on the lifting seat (2c). A shaft (2c2) is slidably installed in the bushing (2c1). A connector (2c3) is provided at one end of the shaft (2c2) facing the ring network box (1). The connector (2c3) is sleeved on the gate arm of the reclosing gate (1e). A sensing unit (2d) is provided at the bottom of the detection seat (2b). The sensing unit (2d) is located below the lifting seat (2c) and detects the vertical height change and speed of the lifting seat (2c).

2. The 12kV digital primary and secondary integrated ring main unit according to claim 1, characterized in that, The sensing unit (2d) includes a laser rangefinder (2d1) and a target (2d2). A positioning seat (2b2) ​​is provided at the bottom of the detection seat (2b). The laser rangefinder (2d1) is coaxially installed in the positioning seat (2b2) ​​and the detection end is kept vertically upward. The target (2d2) is installed at the bottom of the lifting seat (2c) and is located directly above the detection end of the laser rangefinder (2d1).

3. The 12kV digital primary and secondary integrated ring main unit according to claim 1, characterized in that, The detection seat (2b) is provided with hanging ears (2b3) on the upper and lower sides. The detection seat (2b) is installed on the housing (2a) by the hanging ears (2b3) and bolts.

4. The 12kV digital primary and secondary integrated ring main unit according to claim 1, characterized in that, The outer casing (2a) is provided with a cover (2a1) that covers all the detection seats (2b).

5. The 12kV digital primary and secondary integrated ring main unit according to claim 4, characterized in that, Several reset sliders (2a2) are slidably installed on the outside of the cover (2a1). Each reset slider (2a2) is synchronously connected to the lifting seat (2c) on the detection seat (2b). The reset slider (2a2) has an insertion hole (2a3) on the side facing the inside of the housing (2a). The bushing (2c1) of the lifting seat (2c) is inserted into the insertion hole (2a3).

6. The 12kV digital primary and secondary integrated ring main unit according to claim 5, characterized in that, The cover (2a1) is provided with a clearance hole (2a4) for avoiding the bushing (2c1). The clearance hole (2a4) extends in the vertical direction and the width of the clearance hole (2a4) is not less than the outer diameter of the bushing (2c1).

7. The 12kV digital primary and secondary integrated ring main unit according to claim 5, characterized in that, The outer side of the cover (2a1) is provided with several vertical limiting slide rails (2a5), and the reset slider (2a2) is slidably installed in the limiting slide rails (2a5).

8. The 12kV digital primary and secondary integrated ring main unit according to claim 5, characterized in that, An insulating push handle (2a6) is provided on the outside of the reset slider (2a2).

9. The 12kV digital primary and secondary integrated ring main unit according to claim 6, characterized in that, The reset slider (2a2) is provided with sealing pieces (2a7) on the upper and lower sides. The sealing pieces (2a7) fit against the outer wall of the cover (2a1) and block the clearance hole (2a4).

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